Insulation fireproof cable

Abstract

The invention relates to an insulating fireproof cable in the technical field of cables, which comprises three branch lines, the three branch lines are arranged in a triangular contact manner so as to form a central cavity, and the three branch lines are sequentially sleeved with an inner flame-retardant sleeve, a waterproof sleeve and an insulating sleeve; the inner sleeve wall of the inner flame-retardant sleeve is in wrapping contact with the outer wall portions, away from the central cavity, of the three branch lines, so that side cavities are formed between every two adjacent branch lines and the inner flame-retardant sleeve, and expansion type fireproof materials are arranged in the side cavities. Filling type materials are arranged at the positions, corresponding to the side cavities, between the inner flame-retardant sleeve and the waterproof sleeve, and an angle cavity is formed between every two adjacent filling type materials. The insulated fireproof cable can reduce the cost and loss and improve the internal fireproof effect.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to an insulated fireproof cable. Background Art

[0002] As is known, fireproof cables or flame-retardant cables are cables specially designed to maintain power supply and reduce the spread of fire in emergency situations such as fire. They are usually used in places with special safety requirements for power systems, such as buildings, factories, power facilities, transportation systems, and chemical production. The main difference between fireproof and flame-retardant cables and ordinary cables is that they can effectively prevent the spread of fire or extend the fire resistance time of cables, thereby reducing accident losses and protecting personnel safety. Cables are generally composed of multiple branches. Traditional fire retardant coating is applied to the outer wall of the cable. When local overheating, poor contact, short circuit, current overload, etc. occur, fire will also occur from inside the cable. In order to perform internal flame retardancy, the filler between the branches also needs to be replaced with flame retardant material. However, the defect is that the gaps between multi-branch cables are large, especially three-branch cables. A lot of flame retardant fillers are required, which greatly increases the material cost. More importantly, when an internal combustion fire occurs in one branch, other branches will also be ignited, which not only increases the flame retardant risk but also increases the loss. Summary of the invention

[0003] In order to overcome the deficiencies in the background technology and solve the existing technical problems, the present invention discloses an insulated fireproof cable, which can reduce costs and losses and improve internal fireproofing effects.

[0004] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: An insulated fireproof cable comprises three branches, which are arranged in a triangular contact configuration to form a central cavity, and the three branches are sequentially sheathed with an inner flame-retardant sheath, a waterproof sheath and an insulating sheath; the inner sheath wall of the inner flame-retardant sheath covers and contacts the outer wall of the three branches away from the central cavity, so that a side cavity is formed between two adjacent branches and the inner flame-retardant sheath, and an intumescent fireproof material is arranged in the side cavity; a filling material is arranged at a position corresponding to each side cavity between the inner flame-retardant sheath and the waterproof sheath, and a corner cavity is formed between two adjacent filling materials.

[0005] Furthermore, the branch line includes a conductor core, and an isolation sleeve and a shielding sleeve which are sequentially wrapped around the conductor core.

[0006] Furthermore, the inner flame-retardant sleeve is elastic.

[0007] Furthermore, the covering angle between the inner flame retardant sleeve and the outer wall of each branch line is greater than 120 degrees, so that the corresponding sleeve wall of the inner flame retardant sleeve close to the side cavity is concave.

[0008] Furthermore, the intumescent fireproof material is provided as a coating material applied to the corresponding outer wall of the branch line.

[0009] Furthermore, the intumescent fireproof material is set as an inorganic intumescent fireproof filler and fills the side cavity.

[0010] Furthermore, the three filling profiles are evenly distributed, and the distance between two adjacent filling profiles is 0.5 to 0.8 times the branch line diameter.

[0011] Furthermore, an outer flame retardant sleeve is provided outside the insulating sleeve.

[0012] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects: The insulated fireproof cable disclosed in the present invention has an internal flame-retardant effect by arranging an inner flame-retardant sleeve, so that the filling material can be made of general materials, thereby greatly reducing the internal flame-retardant cost. In addition, the intumescent fireproof material arranged in the side cavity will expand when heated and ignited, and invade the central cavity, playing a fire-retardant role. At the same time, it can squeeze the branch lines into their respective corresponding corner cavities, so that two adjacent branch lines can be separated to prevent the temperature and fire from spreading to other branch lines, thereby improving the flame-retardant effect, reducing losses, and facilitating the recovery and reuse of undamaged branch lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional schematic diagram of the present invention.

[0014] In the figure: 1. branch line; 101. shielding sleeve; 102. isolation sleeve; 103. core guide; 2. inner flame retardant sleeve; 3. central cavity; 4. intumescent fireproof material; 5. filling material; 6. waterproof sleeve; 7. insulating sleeve; 8. corner cavity. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right" and the like indicating directions or positional relationships, they are only corresponding to the drawings of the present invention, for the convenience of describing the present invention, and do not indicate or imply that the devices or components referred to must have a specific direction: Combined with Figure 1 The insulated fireproof cable comprises three branches 1; as required, the branch 1 comprises a conductor core 103, and an isolation sleeve 102 and a shielding sleeve 101 which are sequentially covered on the outside of the conductor core 103, the isolation sleeve 102 generally plays a role of insulation protection, and the shielding sleeve 101 can prevent external signal interference; the three branches 1 are arranged in a triangular contact layout to form a central cavity 3, and the three branches 1 are sequentially covered with an inner flame retardant sleeve 2, a waterproof sleeve 6 and an insulating sleeve 7, and the inner flame retardant sleeve 2 is made of flame retardant material to prevent the cable from being damaged at high temperature; The inner sleeve wall of the inner flame retardant sleeve 2 covers and contacts the outer wall of the three branches 1 away from the central cavity 3, and is preferably bonded and fixed, so that a side cavity is formed between two adjacent branches 1 and the inner flame retardant sleeve 2, and the three side cavities evenly surround the central cavity 3; as needed, the inner flame retardant sleeve 2 has elasticity to prevent the inner flame retardant sleeve 2 from being broken when the spacing between the branches 1 changes, thereby destroying the flame retardant effect; if the flame retardant material used in the inner flame retardant sleeve 2 is not elastic, the covering angle between the inner flame retardant sleeve 2 and the outer wall of each branch 1 can be greater than 120 degrees, so that the corresponding sleeve wall of the inner flame retardant sleeve 2 close to the side cavity is concave, The inner flame retardant sleeve 2 has a certain external support change space; an intumescent fireproof material 4 is provided in the side cavity; according to needs, the intumescent fireproof material 4 is set as a coating material applied to the corresponding outer wall of the branch line 1, which has the advantages of less material consumption and low cost. In addition, the intumescent fireproof material 4 is set as an inorganic intumescent fireproof filler and fills the side cavity, which has the advantage of being able to play a certain filler retention role on the branch line 1. The intumescent fireproof material 4 is an existing flame retardant material and will not be described in detail. It is mainly capable of expanding the volume after being heated, has strong covering and fire extinguishing properties, and can even decompose flame retardant gas to increase the fire extinguishing effect; A filling profile 5 is provided at the position corresponding to each side cavity between the inner flame retardant sleeve 2 and the waterproof sleeve 6. The filling profile 5 is generally elastic and mainly supports the branch line 1. A corner cavity 8 is formed between two adjacent filling profiles 5. The corner cavity 8 and the central cavity 3 are just located on both sides of the corresponding branch line 1. In addition, the three filling profiles 5 are evenly distributed, and the spacing between two adjacent filling profiles 5 is 0.5 to 0.8 times the diameter of the branch line 1. While the branch line is resisted and maintained, a certain amount of extrusion and movement space can also be reserved.

[0016] According to needs, the insulating sleeve 7 is also covered with an outer flame retardant sleeve to enhance the external flame retardant effect.

[0017] When the insulated fireproof cable described in the present invention is implemented, when a high-temperature fire occurs inside the branch line 1, the intumescent fireproof material 4 arranged in the side cavity expands due to the heat and invades the central cavity 3, playing a fire-proof and flame-retardant role. At the same time, it can squeeze the branch lines 1 into their respective corresponding corner cavities 8, so as to separate the two adjacent branch lines 1 and prevent the temperature and fire from spreading to other branch lines 1, thereby improving the flame-retardant effect and reducing losses.

[0018] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. An insulated fireproof cable, characterized by: The invention comprises three branch lines (1), the three branch lines (1) are arranged in a triangular contact configuration to form a central cavity (3), and the three branch lines (1) are sequentially covered with an inner flame retardant sleeve (2), a waterproof sleeve (6) and an insulating sleeve (7); the inner sleeve wall of the inner flame retardant sleeve (2) covers and contacts the outer wall of the three branch lines (1) away from the central cavity (3), so that a side cavity is formed between two adjacent branch lines (1) and the inner flame retardant sleeve (2), and an intumescent fireproof material (4) is provided in the side cavity; a filling material (5) is provided at a position corresponding to each side cavity between the inner flame retardant sleeve (2) and the waterproof sleeve (6), and a corner cavity (8) is formed between two adjacent filling materials (5).

2. The insulated fireproof cable according to claim 1, characterized in that: The branch line (1) comprises a guide core (103), and an isolation sleeve (102) and a shielding sleeve (101) which are sequentially coated on the outside of the guide core (103).

3. The insulated fireproof cable according to claim 1, characterized in that: The inner flame retardant sleeve (2) is elastic.

4. The insulated fireproof cable according to claim 1, characterized in that: The wrapping angle between the inner flame retardant sleeve (2) and the outer wall of each branch line (1) is greater than 120 degrees, so that the corresponding sleeve wall of the inner flame retardant sleeve (2) close to the side cavity is concave.

5. The insulated fireproof cable according to claim 1, characterized in that: The intumescent fireproof material (4) is provided as a coating material applied to the corresponding outer wall of the branch line (1).

6. The insulated fireproof cable according to claim 1, characterized in that: The intumescent fireproof material (4) is an inorganic intumescent fireproof filler and fills the side cavity.

7. The insulated fireproof cable according to claim 1, characterized in that: The three filling profiles (5) are evenly distributed, and the distance between two adjacent filling profiles (5) is 0.5 to 0.8 times the diameter of the branch line (1).

8. The insulated fireproof cable according to claim 1, characterized in that: The insulating sleeve (7) is also provided with an outer flame retardant sleeve.

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