Mineral insulated flame-retardant fire-resistant cable

Abstract

The utility model discloses a mineral insulated flame-retardant fire-resistant cable, which comprises an outer protective sleeve, an annular scale is arranged on the outer surface of the outer protective sleeve, a mineral layer is arranged on one side of the inner part of the outer protective sleeve, an insulating protective layer is attached to the surface of one side of the mineral layer, an insulating layer is attached to one side of the insulating protective layer, and a flame-retardant layer is attached to the other side of the insulating layer. An insulating ring is arranged in the insulating layer, and an inner protective sleeve is arranged in the insulating ring; according to the mineral insulated flame-retardant fire-resistant cable, through the arrangement of the inner protective sleeve, the flame-retardant protective layer, the fire-resistant layer, the copper wires and the copper wires, when a power supply carried by the cable encounters fire and burns, the fire-resistant layer itself protects the internal copper wires and the copper wires from being in direct contact with external flames; the flame-retardant protective layer formed by the flame retardant made of magnesium hydroxide is brushed on the outer portion of the flame-retardant layer, and therefore the flame-retardant and fire-resistant characteristics of the original high-temperature-resistant flame-retardant layer are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field related to cables, in particular to a mineral insulated flame-retardant and fire-resistant cable. Background Art

[0002] Cable is an electric energy or signal transmission device, usually composed of several or several groups of wires, each group of at least two twisted together to form a rope-like cable. Each group of wires is insulated from each other and often twisted around a center. The entire outside is covered with a highly insulating covering. The cable has the characteristics of internal power supply and external insulation. Cables include power cables, control cables, compensating cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, mineral insulated cables, etc. They are all composed of single or multiple wires and insulating layers, and are used to connect circuits, electrical appliances, etc. Mineral insulated cable is a cable with a copper conductor core wrapped with a copper sheath and magnesium oxide powder as an inorganic insulating material to isolate the conductor and the sheath. The outermost layer can be selected with an appropriate protective cover as needed.

[0003] In the existing Chinese authorized patent announcement number CN216928139U, a composite cable includes a cable core and an insulating protective sleeve arranged outside the cable core, a waterproof layer is fixedly arranged outside the insulating protective sleeve, a buffer layer is arranged outside the waterproof layer, a cross-section of the buffer layer includes a plurality of first arc-shaped portions protruding outwardly and a second arc-shaped portion connected between the two first arc-shaped portions and concave inwardly, an anti-corrosion layer is arranged outside the buffer layer, and the shape of the inner wall of the anti-corrosion layer is the same as the shape of the outer wall of the buffer layer. By arranging the waterproof layer outside the insulating protective sleeve, the insulating protective sleeve is effectively prevented from being damaged. The problem of leakage is caused by the buffer layer having a first arc-shaped portion protruding outward and a second arc-shaped portion concave inward, which can play a better buffering role when the composite cable is under pressure, thereby improving the safety protection of the composite cable; however, during the use of the composite cable, due to the continuous increase in the utilization rate of mineral insulated cables and the increasing demand, this type of cable is prone to combustion under high voltage, heat source, certain temperature and other conditions when encountering a fire. If the cable causes combustion, it will not only affect the normal circuit transmission, but the burning cable will also increase the difficulty of rescue and fire extinguishing. Therefore, it is necessary to propose a mineral insulated flame retardant and fire-resistant cable. Utility Model Content

[0004] The utility model aims to provide a mineral insulated flame retardant and fire resistant cable to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a mineral insulated flame-retardant and fire-resistant cable, comprising an outer protective sheath, an annular scale is provided on the outer surface of the outer protective sheath, a mineral layer is provided on one side of the inner side of the outer protective sheath, an insulating protective layer is adhered to the surface of one side of the mineral layer, an insulating layer is adhered to one side of the insulating protective layer, an insulating ring is provided inside the insulating layer, an inner protective sheath is provided inside the insulating ring, a flame-retardant protective layer is adhered to one side of the inner protective sheath, a fire-resistant layer is adhered to one side of the flame-retardant protective layer, a copper wire is provided inside the fire-resistant layer, a copper conductor is movably connected to one side of the copper wire, and an external winding drum is provided outside the outer protective sheath.

[0006] Preferably, the outer protective cover is in close contact with the mineral layer, and the sizes of the outer protective cover and the mineral layer are consistent.

[0007] Preferably, the insulating protective layer is tightly fitted to the insulating layer, and one side of the insulating protective layer is adhered to one side of the insulating layer.

[0008] Preferably, the insulating ring is movably connected to the inner protective sleeve, and the inner protective sleeve is distributed at equal intervals in the insulating ring.

[0009] Preferably, the flame retardant protective layer is tightly fitted to the fire resistant layer, and the sizes of the flame retardant protective layer and the fire resistant layer are consistent.

[0010] Preferably, a movable rotating shaft is fixedly mounted on one side of the external winding drum, a cross handle is fixedly mounted on one side of the movable rotating shaft, and a winding drum is movably connected to the other side of the movable rotating shaft.

[0011] Preferably, the winding drum forms a rotating structure with an external winding disk via a movable rotating shaft, and the center line of the winding drum coincides with the center line of the movable rotating shaft.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. This mineral insulated flame retardant and fire-resistant cable has an inner protective sheath, a flame retardant protective layer, a fire resistant layer, a copper wire and a copper conductor. When the device is equipped with a power supply and encounters a fire, the fire resistant layer itself protects the internal copper wire and the copper conductor from direct contact with the external flame, thereby reducing the probability of combustion and improving the overall fire resistance of the device. In addition, the flame retardant protective layer formed by a flame retardant made of magnesium hydroxide applied to the outside of the fire resistant layer enhances the flame retardant and fire resistant properties of the original high temperature resistant fire resistant layer. Under such double protection, when the device encounters a fire spread, the flame retardant protective layer and the fire resistant layer in the inner protective sheath after the outer protective sheath is destroyed can effectively reduce the probability of itself being burned and spread, thereby enhancing the overall resistance to the flame temperature, playing a role of flame retardancy and fire resistance, and reducing the difficulty of rescue in subsequent fire rescue from the side.

[0014] 2. This mineral insulated flame retardant and fire resistant cable is provided with an outer protective sheath, a mineral layer, an insulating protective layer, an insulating layer and an insulating ring. The original function of the mineral insulated cable is to be used for insulation. Generally, the cable is used to carry high voltage to power some large machinery. High voltage electricity has penetrability, so the mineral layer, the insulating protective layer and the insulating layer form triple insulation protection for the copper wire and copper conductor carrying high voltage electricity inside, which enhances the overall safety of the device during use, avoids the current penetrating and conducting and spreading when carrying high voltage electricity, and also improves the overall carrying capacity of the device for high voltage current;

[0015] 3. This mineral insulated flame retardant and fire-resistant cable is provided with an annular ruler, an external winding reel, a movable shaft, a cross handle and a winding drum. When the device is used to carry a power supply to supply power to large machinery, the cable becomes bulky and difficult to control when the cable is pulled too long. The cross handle can be used to control the movable shaft to retract and release the cable on the winding drum. It is not only convenient for pulling the wire to supply power to large machinery, but also convenient for distinguishing the unrolled cable to be reeled in. The annular ruler of the outer protective cover can record the overall length spacing of the device, which is convenient for cutting the cable according to the marked size of the annular ruler when using it, saving the overall use of the cable without causing cost waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the outer protective cover of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the inner protective cover of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the external winding drum of the utility model.

[0020] In the figure: 1. outer protective cover; 2. annular scale; 3. mineral layer; 4. insulating protective layer; 5. insulating layer; 6. insulating ring; 7. inner protective cover; 8. flame retardant protective layer; 9. fire-resistant layer; 10. copper wire; 11. copper conductor; 12. outer winding drum; 13. movable rotating shaft; 14. cross handle; 15. winding drum. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-4 The utility model provides a technical solution: a mineral insulated flame-retardant and fire-resistant cable, comprising an outer protective sheath 1, an annular scale 2 is arranged on the outer surface of the outer protective sheath 1, a mineral layer 3 is arranged on one side of the inner side of the outer protective sheath 1, an insulating protective layer 4 is bonded to the surface of one side of the mineral layer 3, an insulating layer 5 is bonded to one side of the insulating protective layer 4, an insulating ring 6 is arranged inside the insulating layer 5, an inner protective sheath 7 is arranged inside the insulating ring 6, a flame-retardant protective layer 8 is bonded to one side of the inner protective sheath 7, a fire-resistant layer 9 is bonded to one side of the flame-retardant protective layer 8, a copper wire 10 is arranged inside the fire-resistant layer 9, a copper conductor 11 is movably connected to one side of the copper wire 10, and an external winding drum 12 is arranged outside the outer protective sheath 1.

[0023] In this embodiment, the outer protective cover 1 and the mineral layer 3 are in close contact with each other, and the sizes of the outer protective cover 1 and the mineral layer 3 are consistent. The mineral layer 3 provides basic insulation protection for the device and serves as the last layer of insulation protection inside the outer protective cover 1 .

[0024] In this embodiment, the insulating protective layer 4 is tightly fitted with the insulating layer 5, one side of the insulating protective layer 4 is adhered to one side of the insulating layer 5, and the insulating protective layer 4 and the insulating layer 5 cooperate with the mineral layer 3 to form triple insulation protection for the copper wire 10 and the copper conductor 11 carrying high voltage electricity inside, thereby enhancing the overall safety of the device during use.

[0025] In this embodiment, the insulating ring 6 is movably connected to the inner protective sleeve 7, and the inner protective sleeve 7 is evenly spaced inside the insulating ring 6. The insulating ring 6 first isolates the insulating protective layer 4 from the insulating layer 5 to block a portion of the high-voltage current, thereby reducing the insulation pressure on the triple insulation protection below.

[0026] In this embodiment, the flame retardant protective layer 8 and the fire-resistant layer 9 are tightly fitted, and the sizes of the flame retardant protective layer 8 and the fire-resistant layer 9 are consistent. The flame retardant protective layer 8 formed by a flame retardant made of magnesium hydroxide is brushed on the outside of the fire-resistant layer 9. In this way, the flame retardant and fire-resistant properties of the originally high-temperature resistant fire-resistant layer 9 are enhanced.

[0027] In this embodiment, a movable shaft 13 is fixedly installed on one side of the external winding drum 12, a cross handle 14 is fixedly installed on one side of the movable shaft 13, and a winding drum 15 is movably connected to the other side of the movable shaft 13. The movable shaft 13 is controlled by the cross handle 14 to retract and release the cable on the winding drum 15, which not only facilitates the wiring to supply power to large machinery, but also makes it convenient to distinguish and reel in the spread out cables.

[0028] In this embodiment, the winding drum 15 forms a rotating structure with the external winding disk 12 through the movable rotating shaft 13. The center line of the winding drum 15 coincides with the center line of the movable rotating shaft 13. The overall structure of the movable rotating shaft 13 is simple and the cost is low. It is also convenient to replace and repair it in time when a fault occurs.

[0029] Working principle: When using the mineral insulated flame retardant and fire-resistant cable, first use the length of the device according to the needs to control the movable shaft 13 through the cross handle 14 to rotate the winding drum 15, and then retract and release the cable on the winding drum 15, and then unfold a certain length of cable and cut it according to the size marked by the circular ruler 2 on the outer protective sleeve 1, so as not to cause excessive waste of the cost of the device. Then connect one end of the device to the power supply and the other end to the large machinery. After the connection and installation are completed, the external power supply can be turned on, so that the device can carry a high-voltage power supply to power the large machinery. During the power supply process of the device, the high voltage electricity flowing from the copper wire 10 and the copper conductor 11 is triple-insulated and protected by the mineral layer 3, the insulating protective layer 4 and the insulating layer 5. The overall safety of the device during use is enhanced, and the current penetration and conductive spread when carrying high voltage electricity is avoided, providing stability for the power supply of the entire large-scale machinery. If a sudden fire occurs, when the outer protective sheath 1 is damaged, the flame retardant protective layer 8 and the fire-resistant layer 9 in the inner protective sheath 7 can effectively reduce the probability of its own combustion and spread, and enhance the overall resistance to flame temperature, playing a flame retardant and fire-resistant role. Finally, after completing the power supply of all large-scale machinery according to the above operation, cut off the external power supply, and wind up the device through the external winding reel 12. The material of the insulating protective layer 4 is: PVC polyethylene, and the material of the flame retardant protective layer 8 is: magnesium hydroxide. In this way, the use process of the mineral insulated flame retardant and fire-resistant cable is completed.

[0030] 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 mineral insulated flame retardant and fire resistant cable, comprising an outer protective sheath (1), characterized in that: The outer surface of the outer protective sleeve (1) is provided with an annular scale (2), the inner side of the outer protective sleeve (1) is provided with a mineral layer (3), one side of the surface of the mineral layer (3) is adhered with an insulating protective layer (4), one side of the insulating protective layer (4) is adhered with an insulating layer (5), an insulating ring (6) is provided inside the insulating layer (5), an inner protective sleeve (7) is provided inside the insulating ring (6), a flame retardant protective layer (8) is adhered to one side of the inner protective sleeve (7), a fire resistant layer (9) is adhered to one side of the flame retardant protective layer (8), a copper wire (10) is provided inside the fire resistant layer (9), one side of the copper wire (10) is movably connected with a copper conductor (11), and an external winding drum (12) is provided outside the outer protective sleeve (1).

2. A mineral insulated flame retardant and fire resistant cable according to claim 1, characterized in that: The outer protective sleeve (1) and the mineral layer (3) are in close contact with each other, and the sizes of the outer protective sleeve (1) and the mineral layer (3) are consistent.

3. A mineral insulated flame retardant and fire resistant cable according to claim 1, characterized in that: The insulating protective layer (4) and the insulating layer (5) are tightly fitted together, and one side of the insulating protective layer (4) is adhered to one side of the insulating layer (5).

4. A mineral insulated flame retardant and fire resistant cable according to claim 1, characterized in that: The insulating ring (6) is movably connected to the inner protective sleeve (7), and the inner protective sleeve (7) is distributed at equal intervals inside the insulating ring (6).

5. A mineral insulated flame retardant and fire resistant cable according to claim 1, characterized in that: The flame retardant protective layer (8) and the fire resistant layer (9) are tightly fitted together, and the sizes of the flame retardant protective layer (8) and the fire resistant layer (9) are consistent.

6. A mineral insulated flame retardant and fire resistant cable according to claim 1, characterized in that: A movable rotating shaft (13) is fixedly mounted on one side of the external winding drum (12), a cross handle (14) is fixedly mounted on one side of the movable rotating shaft (13), and a winding drum (15) is movably connected to the other side of the movable rotating shaft (13).

7. A mineral insulated flame retardant and fire resistant cable according to claim 6, characterized in that: The winding drum (15) forms a rotating structure with the external winding disc (12) via a movable rotating shaft (13), and the center line of the winding drum (15) coincides with the center line of the movable rotating shaft (13).

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