An environmentally friendly and highly flame-retardant flexible fireproof cable

Abstract

The present invention relates to the technical field of fireproof cables, specifically to an environmentally friendly and highly flame-retardant flexible fireproof cable, which solves the problem that the flexibility of fireproof cables is reduced due to the addition of high-temperature resistant and flame-retardant materials, thereby causing the fireproof cables to be easily broken or damaged when bent. An environmentally friendly and highly flame-retardant flexible fireproof cable, comprising an insulating protective sleeve, characterized in that: a heat-insulating and flame-retardant protective sleeve is provided on the inner side of the insulating protective sleeve, an armored protective sleeve is provided on the inner side of the heat-insulating and flame-retardant protective sleeve, an insulating shielding sleeve is provided on the inner side of the armored protective sleeve, and a cable core torsion protective sleeve and a plurality of cable cores are inserted on the inner side of the insulating shielding sleeve. The present invention ensures that when the cable is stretched or bent, the spirally wound cable core can offset the stretching force and the bending force, thereby avoiding damage or breakage of the cable core due to the stretching or bending of the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of fireproof cables, in particular to an environmentally friendly and highly flame-retardant flexible fireproof cable. Background Art

[0002] A cable is made of one or more mutually insulated conductors and an outer insulating protective layer. It is a wire that transmits electricity or information from one place to another. It is usually made up of several or several groups of conductors (at least two in each group) twisted together like a rope. Each group of conductors is insulated from each other and often twisted around a central conductor. The entire outer layer is covered with a highly insulating covering. The cable has the characteristics of internal power supply and external insulation. According to the different cable materials, it can be divided into: fire-proof cable, waterproof cable, pressure-resistant cable, etc. Among them, the fire-proof cable has high-temperature resistant and flame-retardant materials added inside, which can prevent it from burning for a long time under the influence of external flames.

[0003] However, the existing fireproof cables have reduced flexibility due to the addition of high-temperature resistant and flame-retardant materials, which makes the fireproof cables easily break or damage when bent; therefore, they do not meet existing needs. In this regard, we propose an environmentally friendly and highly flame-retardant flexible fireproof cable. Summary of the Invention

[0004] The purpose of the present invention is to provide an environmentally friendly and highly flame-retardant flexible fireproof cable to solve the problem that the fireproof cable proposed in the above background technology has reduced flexibility due to the addition of high-temperature resistant and flame-retardant materials, which makes the fireproof cable easy to break or be damaged when bent.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an environmentally friendly, highly flame-retardant, flexible fire-resistant cable, comprising an insulating protective sleeve, characterized in that: a heat-insulating flame-retardant protective sleeve is provided on the inner side of the insulating protective sleeve, an armored protective sleeve is provided on the inner side of the heat-insulating flame-retardant protective sleeve, an insulating shielding sleeve is provided on the inner side of the armored protective sleeve, a cable core torsion protection sleeve and a plurality of cable cores are inserted into the inner side of the insulating shielding sleeve, and the cable cores are mounted on the outer surface of the cable core torsion protection sleeve;

[0006] The cable core torsion protection sleeve includes a plurality of central cylindrical blocks, which are distributed in a linear array along the length direction of the insulating shielding sleeve. A rubber connecting rod is fixed between every two adjacent central cylindrical blocks. Six torsion rings are rotatably installed on the outer side of the central cylindrical block. The outer surface of the torsion ring is fixed with multiple groups of symmetrical reset arc blocks. A cable core clamping block is fixed between every two symmetrical reset arc blocks. The middle of the cable core clamping block is recessed toward the torsion ring and forms a clamping groove. The cable core is clamped on the inner side of the clamping groove. The deflection angle between the cable core clamping blocks on the outer surfaces of two adjacent torsion rings is positive thirty degrees.

[0007] Preferably, the outer surface of the central cylindrical block is provided with a plurality of torsion guide grooves, a torsion slider is slidably installed on the inner side of the torsion guide groove, and a reset spring is fixed between one end of the torsion slider and one end face of the torsion guide groove.

[0008] Preferably, the outer surface and inner surface of the armored protective sleeve are provided with a plurality of first buffer ring grooves distributed at equal intervals along the length direction thereof, and the outer surface and inner surface of the insulating shielding sleeve are provided with a plurality of second buffer ring grooves distributed at equal intervals along the length direction thereof.

[0009] Preferably, a plurality of buffer filling rings are provided between the armored protective cover and the insulating shielding cover, and the buffer filling rings are clamped in the first buffer ring groove on the inner surface of the armored protective cover and the inner side of the second buffer ring groove on the outer surface of the insulating shielding cover, and the inner side of the buffer filling rings is filled with water.

[0010] Preferably, the interiors of the armored protective sleeve and the insulating shielding sleeve are hollow and filled with inert gas.

[0011] Preferably, the heat-insulating flame-retardant protective sleeve comprises a hollow rubber sleeve, a filling inner chamber is provided inside the hollow rubber sleeve, and the interior of the filling inner chamber is filled with flame-retardant liquid.

[0012] Preferably, the components of the flame retardant liquid include heat transfer oil T55, alkyl naphthalene type heat transfer oil, and alkyl biphenyl type heat transfer oil, and the mixing ratio of heat transfer oil T55, alkyl naphthalene type heat transfer oil, and alkyl biphenyl type heat transfer oil is 5:3:2.

[0013] Preferably, the inner surface and the outer surface of the hollow rubber sleeve are both provided with a plurality of buffer arc-shaped protrusions arranged in a linear array along the length direction thereof.

[0014] Preferably, the outer side of the hollow rubber sleeve is provided with multiple groups of outer protection arc plates, and the inner side of the hollow rubber sleeve is provided with multiple groups of inner protection arc plates, and the multiple groups of outer protection arc plates and inner protection arc plates are distributed in a linear array along the length direction of the hollow rubber sleeve.

[0015] Preferably, each group of outer protection arc plates and each group of inner protection arc plates have six, and multiple first elastic connecting ropes are fixed between the ends of adjacent outer protection arc plates in the same group, and the outer protection arc plates cover the outer side of the buffer arc protrusions on the outer surface of the hollow rubber sleeve. Multiple second elastic connecting ropes are fixed between the ends of adjacent inner protection arc plates in the same group, and the inner protection arc plates cover the outer side of the buffer arc protrusions on the inner surface of the hollow rubber sleeve.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention fixes the cable core by means of a cable core clamping block on the outer surface of a torsion ring outside the central cylindrical block, and by means of a 30-degree deflection angle between the cable core clamping blocks on the outer surfaces of adjacent torsion rings, the cable core is wound in a spiral shape outside the central cylindrical block. This ensures that when the cable is stretched or bent, the spirally wound cable core can offset the stretching and bending forces, thereby preventing the cable core from being damaged or broken due to the stretching or bending of the cable.

[0018] 2. In the present invention, when external pressure acts on the cable, the insulating protective sleeve, the heat-insulating flame-retardant protective sleeve, the armored protective sleeve, and the insulating shielding sleeve are deformed and partially offset and absorb the external pressure. When the remaining pressure is transmitted to the cable core clamping block through the insulating shielding sleeve, the cable core clamping block bends toward the torsion ring at both ends due to the pressure. At this time, the width of the clamping slot increases, and the reset arc stopper bends toward the torsion ring due to the bent end. The bent cable core clamping block and the reset arc stopper absorb and offset the pressure. During this process, the cable core will not be directly affected by the pressure, and the cable core clamping block will not squeeze the cable core when it is compressed and deformed, thereby improving the flexibility and pressure resistance of the cable;

[0019] 3. When flames act on the insulating protective sheath, the present invention absorbs the heat received by the insulating protective sheath by twisting the flame retardant liquid inside the guide chute, and evenly transfers the heat to the entire cable through the flame retardant liquid, so that the temperature of the insulating protective sheath will not reach the ignition point in a short time, thereby prolonging the time for the cable temperature to rise and improving the flame retardancy and fireproof performance of the cable;

[0020] 4. The present invention utilizes the buffer arc-shaped protrusions to contact the insulating protective sleeve and the armored protective sleeve, so that a certain gap exists between the insulating protective sleeve, the insulating shielding sleeve and the hollow rubber sleeve. When external pressure acts on the insulating protective sleeve, the buffer arc-shaped protrusions on the inner and outer surfaces of the hollow rubber sleeve are deformed first, followed by the deformation of the hollow rubber sleeve. Through the two-stage deformation of the hollow rubber sleeve and the buffer arc-shaped protrusions, the external pressure is weakened, absorbed and offset, thereby improving the elastic performance of the cable and ensuring that the cable core will not be damaged or broken due to external pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0022] Figure 2 A front view of the present invention as a whole;

[0023] Figure 3 This is a schematic structural diagram of the heat-insulating and flame-retardant protective cover of the present invention;

[0024] Figure 4 This is a schematic structural diagram of the hollow rubber sleeve of the present invention;

[0025] Figure 5 Schematic diagram of the partial structure of the outer protective arc plate and the inner protective arc plate of the present invention;

[0026] Figure 6 This is a schematic structural diagram of the cable core torsion protection sleeve of the present invention;

[0027] Figure 7 is a schematic cross-sectional view of the central cylindrical block of the present invention;

[0028] Figure 8 This is a schematic diagram of the connection between the armored protective sleeve and the insulating shielding sleeve of the present invention;

[0029] Figure 9 This is a structural cross-sectional view of the armored protective sleeve and the insulating shielding sleeve of the present invention;

[0030] Figure 10 for Figure 9 A magnified view of the structure at point A.

[0031] In the figure: 1. Insulating protective sleeve; 2. Armoured protective sleeve; 3. Insulating shielding sleeve; 4. Heat-insulating and flame-retardant protective sleeve; 401. Hollow rubber sleeve; 402. Outer protective arc plate; 403. Inner protective arc plate; 404. First elastic connecting rope; 405. Second elastic connecting rope; 406. Buffer arc protrusion; 407. Filling inner chamber; 5. Cable core torsion protective sleeve; 501. Central cylindrical block; 502. Rubber connecting rod; 503. Torsion ring; 504. Cable core clamping block; 505. Clamping slot; 506. Reset arc stopper; 507. Torsion guide slide; 508. Torsion slider; 509. Reset spring; 6. Cable core; 7. First buffer ring groove; 8. Second buffer ring groove; 9. Buffer filling ring. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described 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 the embodiments.

[0033] like Figure 1 As shown, an environmentally friendly, highly flame-retardant, flexible fire-resistant cable comprises an insulating protective sleeve 1, a heat-insulating flame-retardant protective sleeve 4 is provided on the inner side of the insulating protective sleeve 1, an armored protective sleeve 2 is provided on the inner side of the heat-insulating flame-retardant protective sleeve 4, an insulating shielding sleeve 3 is provided on the inner side of the armored protective sleeve 2, a cable core torsion protective sleeve 5 and a plurality of cable cores 6 are inserted into the inner side of the insulating shielding sleeve 3, and the cable cores 6 are installed on the outer surface of the cable core torsion protective sleeve 5. The heat from the outside is absorbed by the heat-insulating flame-retardant protective sleeve 4, and the burning time of the cable is delayed, thereby preventing the fire from being transmitted along the cable.

[0034] like Figure 2 、 Figure 6 and Figure 7 As shown, the cable core torsion protection sleeve 5 includes a plurality of central cylindrical blocks 501, and the central cylindrical blocks 501 are linearly arrayed along the length direction of the insulating shielding sleeve 3. A rubber connecting rod 502 is fixed between every two adjacent central cylindrical blocks 501. Six torsion rings 503 are rotatably installed on the outer side of the central cylindrical block 501. The outer surface of the torsion ring 503 is fixed with a plurality of groups of symmetrical reset arc-shaped blocks 506. A cable core clamping block 504 is fixed between every two symmetrical reset arc-shaped blocks 506. The middle of the cable core clamping block 504 is recessed toward the torsion ring 503 and forms a clamping groove 505. The cable core 6 is clamped in the clamping groove. On the inner side of the slot 505, the deflection angle between the cable core clamping blocks 504 on the outer surfaces of two adjacent torsion rings 503 is positive thirty degrees. The cable core 6 is fixed by the cable core clamping blocks 504 on the outer surface of the torsion ring 503 outside the central cylindrical block 501, and the thirty-degree deflection angle between the cable core clamping blocks 504 on the outer surfaces of adjacent torsion rings 503 is used to make the cable core 6 spirally wound outside the central cylindrical block 501, thereby ensuring that when the cable is stretched or bent, the spirally wound cable core 6 can offset the stretching force and bending force, thereby avoiding damage or breakage of the cable core 6 due to the stretching or bending of the cable.

[0035] The outer surface of the central cylindrical block 501 is provided with a plurality of torsion guide grooves 507, and a torsion slider 508 is slidably installed on the inner side of the torsion guide groove 507. A return spring 509 is fixed between one end of the torsion slider 508 and the end face of one end of the torsion guide groove 507. The torsion slider 508 can slide inside the torsion guide groove 507, so that the torsion ring 503 can rotate outside the central cylindrical block 501. When the cable is assembled, it can ensure that the cable core clamping blocks 504 corresponding to each other on the outer surfaces of adjacent torsion rings 503 are in the same straight line, which is convenient for the assembly of the cable core 6 and the cable core torsion protection cover 5. After assembly, the return spring 509 drives the torsion slider 508 and the torsion ring 503 to reset and rotate, so that the cable core clamping block 504 drives the cable core 6 to move, so that the cable core 6 is spiral.

[0036] like Figures 2 to 5As shown, the heat-insulating flame-retardant protective sleeve 4 includes a hollow rubber sleeve 401, and a filling inner chamber 407 is provided inside the hollow rubber sleeve 401. The interior of the filling inner chamber 407 is filled with a flame retardant liquid. The components of the flame retardant liquid include heat-conducting oil T55, alkyl naphthalene type heat-conducting oil, and alkyl biphenyl type heat-conducting oil. The mixing ratio of heat-conducting oil T55, alkyl naphthalene type heat-conducting oil, and alkyl biphenyl type heat-conducting oil is 5:3:2. When the flame acts on the insulating protective sleeve 1, the flame retardant liquid inside the twisting guide groove 507 absorbs the heat received by the insulating protective sleeve 1, and the heat is evenly transferred to the entire cable through the flame retardant liquid, so that the temperature of the insulating protective sleeve 1 will not reach the ignition point in a short time, thereby prolonging the time for the cable temperature to rise.

[0037] The inner and outer surfaces of the hollow rubber sleeve 401 are provided with a plurality of buffer arc-shaped protrusions 406 arranged in a linear array along its length. The buffer arc-shaped protrusions 406 are in contact with the insulating protective sleeve 1 and the armored protective sleeve 2, so that a certain gap exists between the insulating protective sleeve 1, the insulating shielding sleeve 3 and the hollow rubber sleeve 401. When external pressure acts on the insulating protective sleeve 1, the buffer arc-shaped protrusions 406 on the inner and outer surfaces of the hollow rubber sleeve 401 are deformed first, thereby reducing and offsetting the external pressure.

[0038] The outer side of the hollow rubber sleeve 401 is provided with multiple groups of outer protection arc plates 402, and the inner side of the hollow rubber sleeve 401 is provided with multiple groups of inner protection arc plates 403. The multiple groups of outer protection arc plates 402 and inner protection arc plates 403 are linearly arrayed along the length direction of the hollow rubber sleeve 401. Each group of outer protection arc plates 402 and each group of inner protection arc plates 403 have six. Multiple first elastic connecting ropes 404 are fixed between the ends of adjacent outer protection arc plates 402 in the same group, and the outer protection arc plates 402 cover the outer side of the hollow rubber sleeve 401. On the outside of the buffer arc-shaped protrusions 406 on the surface, multiple second elastic connecting ropes 405 are fixed between the ends of the same group of adjacent inner protective arc plates 403, and the inner protective arc plates 403 cover the outside of the buffer arc-shaped protrusions 406 on the inner surface of the hollow rubber sleeve 401. The outer protective arc plates 402 and the inner protective arc plates 403 are used to cover and protect the buffer arc-shaped protrusions 406 on the inner and outer surfaces of the hollow rubber sleeve 401 to prevent the buffer arc-shaped protrusions 406 from rubbing against the insulating protective sleeve 1 and the insulating shielding sleeve 3, thereby preventing damage or rupture.

[0039] like Figures 8 to 10As shown, the outer surface and inner surface of the armored protective sleeve 2 are provided with a plurality of first buffer ring grooves 7 distributed at equal intervals along the length direction thereof, and the outer surface and inner surface of the insulating shielding sleeve 3 are provided with a plurality of second buffer ring grooves 8 distributed at equal intervals along the length direction thereof. The first buffer ring grooves 7 on the inner and outer surfaces of the armored protective sleeve 2 and the second buffer ring grooves 8 on the inner and outer surfaces of the insulating shielding sleeve 3 can increase the toughness of the armored protective sleeve 2 and the insulating shielding sleeve 3, so that the armored protective sleeve 2 and the insulating shielding sleeve 3 will not break when being bent, and can be stretched to a certain extent along the length.

[0040] A plurality of buffer filling rings 9 are provided between the armored protective cover 2 and the insulating shielding cover 3. The buffer filling rings 9 are clamped in the first buffer ring groove 7 on the inner surface of the armored protective cover 2 and the inner side of the second buffer ring groove 8 on the outer surface of the insulating shielding cover 3. The inner side of the buffer filling ring 9 is filled with water. The buffer filling ring 9 positions the armored protective cover 2 and the insulating shielding cover 3 so that the armored protective cover 2 and the insulating shielding cover 3 will not move in the length direction. The water inside the buffer filling ring 9 increases the elasticity of the buffer filling ring 9 and improves the overall elasticity of the cable.

[0041] The interior of the armored protective cover 2 and the insulating shielding cover 3 are hollow and filled with inert gas. The armored protective cover 2 and the insulating shielding cover 3 are filled with inert gas, which can increase the elasticity and resistance to external pressure of the armored protective cover 2 and the insulating shielding cover 3. When the external pressure is transmitted to the armored protective cover 2 and the insulating shielding cover 3, the armored protective cover 2 and the insulating shielding cover 3 are elastically deformed, thereby preventing the buffer filling ring 9 from being damaged or ruptured due to external pressure.

[0042] Working principle: When assembling the cable, first rotate the torsion ring 503 on the outside of the central cylindrical block 501 so that the cable core clamping blocks 504 corresponding to the outer surfaces of the two adjacent torsion rings 503 are on the same straight line. After the position of the cable core clamping blocks 504 on the outer surface of the torsion ring 503 is adjusted, the cable core 6 is passed through the middle of the clamping groove 505 in the middle of the cable core clamping block 504. After all the cable cores 6 and the cable core torsion protection sleeve 5 are assembled, release the torsion ring 503. At this time, the reset spring 509 drives the torsion slider 508 to slide and reset inside the torsion guide groove 507. The torsion slider 508 drives the torsion ring 503 to rotate and reset. The cable core clamping block 504 is rotated and reset under the drive of the torsion ring 503. At this time, the cable core 6 is in a spiral state due to the rotation and reset of the cable core clamping block 504 and is distributed on the outside of the central cylindrical block 501.

[0043] After the cable core 6 and the cable core torsion protection sleeve 5 are assembled, the insulating shielding sleeve 3 is put on the outside of the cable core torsion protection sleeve 5 and the cable core 6. At this time, the cable core clamping block 504 is in contact with the inner surface of the insulating shielding sleeve 3, and then the buffer filling ring 9 is clamped on the inner side of the second buffer ring groove 8 on the outer surface of the insulating shielding sleeve 3. Then, the armored protective sleeve 2 is used to cover the insulating shielding sleeve 3 and the buffer filling ring 9. After the armored protective sleeve 2 is installed, the heat-insulating flame-retardant protective sleeve 4 is put on the outside of the armored protective sleeve 2. Finally, the heat-insulating flame-retardant protective sleeve 4 is covered with the insulating protective sleeve 1 to complete the assembly of the cable.

[0044] When a fire occurs outside, the flame acts on the insulating protective sleeve 1, and the temperature of the insulating protective sleeve 1 increases due to the action of the flame. Since the heat-insulating flame-retardant protective sleeve 4 is in contact with the insulating protective sleeve 1, the flame-retardant liquid filled in the inner chamber 407 inside the hollow rubber sleeve 401 absorbs the heat absorbed by the inside of the insulating protective sleeve 1 and transfers it inside the filled inner chamber 407, so that the heat of the flame acting on the insulating protective sleeve 1 is evenly transferred to various parts of the cable, thereby slowing down the speed at which the insulating protective sleeve 1 reaches the ignition point, thereby avoiding the cable from burning and improving the flame retardant performance of the cable.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An environmentally friendly, highly flame-retardant, flexible fireproof cable, comprising an insulating protective sheath (1), characterized in that: The inner side of the insulating protective sleeve (1) is provided with a heat-insulating flame-retardant protective sleeve (4), the inner side of the insulating flame-retardant protective sleeve (4) is provided with an armored protective sleeve (2), the inner side of the armored protective sleeve (2) is provided with an insulating shielding sleeve (3), the inner side of the insulating shielding sleeve (3) is interspersed with a cable core torsion protective sleeve (5) and a plurality of cable cores (6), and the cable cores (6) are installed on the outer surface of the cable core torsion protective sleeve (5); The cable core torsion protection sleeve (5) comprises a plurality of central cylindrical blocks (501), the central cylindrical blocks (501) are linearly arrayed along the length direction of the insulating shielding sleeve (3), a rubber connecting rod (502) is fixed between each two adjacent central cylindrical blocks (501), six torsion rings (503) are rotatably mounted on the outer side of the central cylindrical block (501), a plurality of groups of two-by-two symmetrical reset arc-shaped blocks (506) are fixed on the outer surface of the torsion ring (503), a cable core clamping block (504) is fixed between each two symmetrical reset arc-shaped blocks (506), the middle of the cable core clamping block (504) is recessed in the direction of the torsion ring (503) and forms a clamping groove (505), the cable core (6) is clamped inside the clamping groove (505), and the deflection angle between the cable core clamping blocks (504) on the outer surfaces of two adjacent torsion rings (503) is positive thirty degrees; The outer surface and inner surface of the armored protective sleeve (2) are both provided with a plurality of first buffer ring grooves (7) distributed at equal intervals along the length direction thereof, and the outer surface and inner surface of the insulating shielding sleeve (3) are both provided with a plurality of second buffer ring grooves (8) distributed at equal intervals along the length direction thereof; A plurality of buffer filling rings (9) are provided between the armored protective sleeve (2) and the insulating shielding sleeve (3), the buffer filling rings (9) being clamped to the inner sides of the first buffer ring groove (7) on the inner surface of the armored protective sleeve (2) and the second buffer ring groove (8) on the outer surface of the insulating shielding sleeve (3), and the inner sides of the buffer filling rings (9) are filled with water; The interiors of the armored protective sleeve (2) and the insulating shielding sleeve (3) are both hollow and filled with inert gas.

2. The environmentally friendly, highly flame-retardant, flexible fireproof cable according to claim 1, characterized in that: The outer surface of the central cylindrical block (501) is provided with a plurality of torsion guide slots (507), a torsion slider (508) is slidably mounted on the inner side of the torsion guide slot (507), and a return spring (509) is fixed between one end of the torsion slider (508) and one end surface of the torsion guide slot (507).

3. The environmentally friendly, highly flame-retardant, flexible fireproof cable according to claim 1, characterized in that: The heat-insulating flame-retardant protective sleeve (4) comprises a hollow rubber sleeve (401), wherein a filling inner chamber (407) is provided inside the hollow rubber sleeve (401), and the interior of the filling inner chamber (407) is filled with a flame-retardant liquid.

4. The environmentally friendly, highly flame-retardant, flexible fireproof cable according to claim 3, characterized in that: The flame retardant liquid comprises heat transfer oil T55, alkyl naphthalene type heat transfer oil, and alkyl biphenyl type heat transfer oil, and the mixing ratio of heat transfer oil T55, alkyl naphthalene type heat transfer oil, and alkyl biphenyl type heat transfer oil is 5:3:

2.

5. The environmentally friendly, highly flame-retardant, flexible fireproof cable according to claim 4, characterized in that: The inner surface and the outer surface of the hollow rubber sleeve (401) are both provided with a plurality of buffer arc-shaped protrusions (406) arranged in a linear array along the length direction thereof.

6. The environmentally friendly, highly flame-retardant, flexible fireproof cable according to claim 5, characterized in that: The outer side of the hollow rubber sleeve (401) is provided with a plurality of groups of outer protection arc plates (402), and the inner side of the hollow rubber sleeve (401) is provided with a plurality of groups of inner protection arc plates (403). The plurality of groups of outer protection arc plates (402) and the inner protection arc plates (403) are distributed in a linear array along the length direction of the hollow rubber sleeve (401).

7. The environmentally friendly, highly flame-retardant, flexible fireproof cable according to claim 6, characterized in that: Each group of outer protection arc plates (402) and each group of inner protection arc plates (403) each have six members. A plurality of first elastic connecting ropes (404) are fixed between the ends of adjacent outer protection arc plates (402) in the same group, and the outer protection arc plates (402) cover the outer side of the buffer arc protrusion (406) on the outer surface of the hollow rubber sleeve (401). A plurality of second elastic connecting ropes (405) are fixed between the ends of adjacent inner protection arc plates (403) in the same group, and the inner protection arc plates (403) cover the outer side of the buffer arc protrusion (406) on the inner surface of the hollow rubber sleeve (401).

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