Temperature sensing type fireproof cable

Abstract

The utility model discloses a temperature sensing type fireproof cable, which comprises a plurality of cable cores, any two adjacent cable cores are arranged in a tangent manner, a temperature measuring unit is arranged in a gap among the plurality of cable cores, a first insulating layer is arranged on the outer surface of each cable core, a first fireproof layer is arranged on the outer surface of each first insulating layer, and a second fireproof layer is arranged on the outer surface of each second insulating layer. The outer surfaces of the plurality of cable cores are provided with a filling layer, and the outer side of the filling layer is provided with an outer protection layer. According to the temperature sensing type fireproof cable, the temperature of the cable core and the temperature of the outer surface of the cable are detected through the first optical fiber temperature sensor and the third optical fiber temperature sensor respectively, and the operation temperature of the cable can be monitored conveniently; according to the fireproof cable, the second optical fiber temperature sensor is arranged between the heat insulation layer and the oxygen insulation layer, so that the temperature of the cable can be monitored under the condition that the third optical fiber temperature sensor fails under the conditions of high temperature or open fire and the like, the temperature measurement time of the cable under special conditions is prolonged, and the temperature measurement reliability of the fireproof cable is improved.

Description

Technical Field

[0001] The utility model relates to the field of fireproof cables, in particular to a temperature-sensitive fireproof cable. Background Art

[0002] Cables are usually rope-like cables made of several or several groups of wires twisted together. Each group of wires is insulated from each other and often twisted around a center. The entire outer layer is covered with a highly insulating covering. The cable has the characteristics of being powered inside and insulated outside. Fireproof cable is a branch of the cable. Fireproof cable refers to a cable that can maintain safe operation for a certain period of time under the condition of flames. Fireproof cable is widely used in high-rise buildings, subways, underground streets, large power stations and important industrial and mining enterprises and other places related to fire safety and firefighting lifesaving.

[0003] Since fireproof cables are required to be fireproof, and fireproof cables need to detect the operating temperature inside the cable and the ambient temperature outside the cable, existing ordinary cables usually use optical fiber for temperature measurement. However, when optical fiber encounters high temperature or open flame, its temperature measurement ability is easily invalidated. Therefore, cables with traditional optical fiber structures are difficult to meet the temperature measurement needs in the use environment of fireproof cables. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a temperature-sensitive fireproof cable.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] The utility model discloses a temperature-sensitive fireproof cable, comprising a plurality of cable cores, any two adjacent cable cores being tangent to each other, temperature measuring units being arranged in the gaps between the plurality of cable cores, a first insulating layer being arranged on the outer surface of each of the cable cores, a first fire-resistant layer being arranged on the outer surface of the first insulating layer, a filling layer being arranged on the outer surface of the plurality of cable cores, and an outer protective layer being arranged on the outer side of the filling layer.

[0007] As a preferred technical solution of the utility model, the outer protective layer includes a second insulating layer, a heat insulation layer, an oxygen isolation layer, a second fire resistant layer and a protective layer. The second insulating layer is arranged on the outer surface of the filling layer, the heat insulation layer is arranged on the outer surface of the second insulating layer, the oxygen isolation layer is arranged on the outer surface of the heat insulation layer, the second fire resistant layer is arranged on the outer surface of the oxygen isolation layer, and the protective layer is arranged on the outer surface of the second fire resistant layer.

[0008] As a preferred technical solution of the utility model, a second optical fiber temperature sensor is provided between the heat insulation layer and the oxygen isolation layer, a third optical fiber temperature sensor is provided on the outer surface of the protective layer, and the third optical fiber temperature sensor is fixed on the surface of the protective layer through a clamp.

[0009] As a preferred technical solution of the present utility model, the temperature measuring unit includes a first optical fiber temperature sensor and multiple brackets, the multiple brackets are arranged in the corresponding gaps between the multiple cable cores and are adapted to the gaps between the multiple cable cores, and the optical fiber of the first optical fiber temperature sensor is arranged on the multiple brackets.

[0010] As a preferred technical solution of the utility model, the first insulating layer and the second insulating layer are both PVC material layers, the first fire-resistant layer and the second fire-resistant layer are both ceramic silicone rubber layers, the filling layer is fire-resistant wool, the oxygen isolation layer is a ceramic polyolefin layer, and the thermal insulation layer is a high-temperature glass fiber cloth layer.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] The first optical fiber temperature sensor and the third optical fiber temperature sensor are used to detect the core and outer surface temperatures of the cable respectively, so as to facilitate monitoring of the operating temperature of the cable; by providing a second optical fiber temperature sensor between the heat insulation layer and the oxygen insulation layer, the temperature of the cable can be monitored when the third optical fiber temperature sensor fails under conditions such as high temperature or open flame, thereby extending the cable temperature measurement time under special circumstances and increasing the reliability of fire-resistant cable temperature measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0014] Figure 1 It is a schematic cross-sectional view of the overall structure of the utility model;

[0015] Figure 2 It is a partial structural cross-sectional view of the utility model;

[0016] In the figure: 1, cable core; 2, temperature measuring unit; 201, first optical fiber temperature sensor; 202, bracket; 3, first insulating layer; 4, first fire-resistant layer; 5, filling layer; 6, second insulating layer; 7, heat insulation layer; 8, oxygen isolation layer; 9, second fire-resistant layer; 10, protective layer; 11, second optical fiber temperature sensor; 12, third optical fiber temperature sensor. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0018] In the drawings, the same reference numerals all refer to the same components.

[0019] like Figure 1-2 As shown, the utility model provides a temperature-sensitive fireproof cable, comprising a plurality of cable cores 1, any two adjacent cable cores 1 are arranged tangent to each other, a temperature measuring unit 2 is arranged in the gap between the plurality of cable cores 1, a first insulating layer 3 is arranged on the outer surface of each cable core 1, a first fire-resistant layer 4 is arranged on the outer surface of the first insulating layer 3, a filling layer 5 is arranged on the outer surface of the plurality of cable cores 1, an outer protective layer is arranged on the outer side of the filling layer 5, and a second optical fiber temperature sensor 11 and a third optical fiber temperature sensor 12 are arranged on the outer protective layer.

[0020] In this embodiment, the outer surface of each cable core 1 is coated with a first insulating layer 3 and a first fire-resistant layer 4 in sequence. A temperature measuring unit 2 is arranged along the length direction of the cable core 1 in the gap between a group of three adjacent cable cores 1. The temperature measuring unit 2 can detect the operating temperature inside the cable core 1, which is convenient for the staff to monitor and prevent the cable core 1 from overheating after power is turned on. The outer protective layer protects the outer sides of the multiple cable cores 1, and a second optical fiber temperature sensor 11 and a third optical fiber temperature sensor 12 are arranged on the outer protective layer. The third optical fiber temperature sensor 12 is arranged on the surface of the outer protective layer. The outer temperature of the fireproof cable can be detected by the third optical fiber temperature sensor 12. If the temperature on one side is too high, there may be a fire near this area, which can help the staff to determine whether there is a fire; the second optical fiber temperature sensor 11 is arranged in the outer protective layer. If there is a fire near the fireproof cable, the third optical fiber temperature sensor 12 may fail due to factors such as high temperature or open flame, and the temperature measuring unit 2 is located in the center of the fireproof cable, and the temperature detection error near the outer surface of the fireproof cable is too large. The second optical fiber temperature sensor 11 protected in the outer protective layer can extend the time of temperature detection near the outer surface of the fireproof cable, which is convenient for the staff to estimate the time that the fireproof cable can last in the above-mentioned environment through the temperature, thereby facilitating the staff to judge the time of power failure due to cable damage, and also helps to avoid it when extinguishing the fire.

[0021] Furthermore, the outer protective layer includes a second insulating layer 6, a thermal insulation layer 7, an oxygen isolation layer 8, a second fire-resistant layer 9 and a protective layer 10. The second insulating layer 6 is arranged on the outer surface of the filling layer 5, the thermal insulation layer 7 is arranged on the outer surface of the second insulating layer 6, the oxygen isolation layer 8 is arranged on the outer surface of the thermal insulation layer 7, the second fire-resistant layer 9 is arranged on the outer surface of the oxygen isolation layer 8, and the protective layer 10 is arranged on the outer surface of the second fire-resistant layer 9.

[0022] Furthermore, a second optical fiber temperature sensor 11 is provided between the heat insulation layer 7 and the oxygen isolation layer 8, and a third optical fiber temperature sensor 12 is provided on the outer surface of the protective layer 10. The third optical fiber temperature sensor 12 is fixed to the surface of the protective layer 10 by a clamp.

[0023] In this embodiment, the thermal insulation layer 7 is arranged on the side close to the cable core 1 to reduce the impact on the temperature measured by the second optical fiber temperature sensor 11 and provide thermal insulation protection for the cable core 1. The oxygen isolation layer 8 and the second fire-resistant layer 9 play a flame retardant role, thereby extending the duration of temperature detection by the second optical fiber temperature sensor 11.

[0024] Furthermore, the temperature measuring unit 2 includes a first optical fiber temperature sensor 201 and multiple brackets 202. The multiple brackets 202 are arranged in the gaps between the corresponding multiple cable cores 1 and are adapted to the gaps between the multiple cable cores 1. The optical fiber of the first optical fiber temperature sensor 201 is arranged on the multiple brackets 202.

[0025] In this embodiment, the bracket 202 has three fulcrums, each of which contacts the first fire-resistant layer 4 on a corresponding cable core 1. The optical fiber of the first optical fiber temperature sensor 201 passes through the opening at the center of the bracket 202, thereby detecting the temperature near the cable core 1.

[0026] Furthermore, the first insulating layer 3 and the second insulating layer 6 are both PVC material layers, the first fire-resistant layer 4 and the second fire-resistant layer 9 are both ceramic silicone rubber layers, the filling layer 5 is fire-resistant wool, the oxygen isolation layer 8 is a ceramic polyolefin layer, and the heat insulation layer 7 is a high-temperature glass fiber cloth layer.

[0027] In this embodiment, the PVC material layer, the ceramic silicone rubber layer, the ceramic polyolefin layer and the high-temperature glass fiber cloth layer are all made of existing technologies.

[0028] In the present invention, the first optical fiber temperature sensor 201, the second optical fiber temperature sensor 11 and the third optical fiber temperature sensor 12 all adopt the optical fiber Bragg grating temperature sensor of the prior art (temperature and strain simultaneously cause the optical fiber Bragg grating coupling wavelength to move, so that the temperature and strain cannot be distinguished by measuring the optical fiber Bragg grating coupling wavelength movement). The output ends of the above three optical fiber temperature sensors are connected to an external photoelectric conversion module, and the optical signals of the optical fiber temperature sensors are converted into electrical signals through the photoelectric conversion module and then input into a computer for processing.

[0029] The utility model is a temperature-sensitive fireproof cable. The first optical fiber temperature sensor and the third optical fiber temperature sensor are used to detect the cable core and outer surface temperatures of the cable respectively, so as to facilitate monitoring of the operating temperature of the cable. By arranging a second optical fiber temperature sensor between the heat insulation layer and the oxygen insulation layer, the temperature of the cable can be monitored when the third optical fiber temperature sensor fails under conditions such as high temperature or open flame, thereby extending the temperature measurement time of the cable under special circumstances and increasing the reliability of the temperature measurement of the fireproof cable.

[0030] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temperature-sensitive fireproof cable, characterized in that: The invention comprises a plurality of cable cores (1), any two adjacent cable cores (1) are arranged tangentially to each other, a temperature measuring unit (2) is arranged in the gap between the plurality of cable cores (1), a first insulating layer (3) is arranged on the outer surface of each cable core (1), a first fire-resistant layer (4) is arranged on the outer surface of the first insulating layer (3), a filling layer (5) is arranged on the outer surface of the plurality of cable cores (1), and an outer protective layer is arranged on the outer side of the filling layer (5).

2. A temperature-sensitive fireproof cable according to claim 1, characterized in that: The outer protective layer comprises a second insulating layer (6), a heat insulating layer (7), an oxygen-isolating layer (8), a second fire-resistant layer (9) and a protective layer (10); the second insulating layer (6) is arranged on the outer surface of the filling layer (5); the heat insulating layer (7) is arranged on the outer surface of the second insulating layer (6); the oxygen-isolating layer (8) is arranged on the outer surface of the heat insulating layer (7); the second fire-resistant layer (9) is arranged on the outer surface of the oxygen-isolating layer (8); and the protective layer (10) is arranged on the outer surface of the second fire-resistant layer (9).

3. A temperature-sensitive fireproof cable according to claim 2, characterized in that: A second optical fiber temperature sensor (11) is provided between the heat insulation layer (7) and the oxygen isolation layer (8), a third optical fiber temperature sensor (12) is provided on the outer surface of the protective layer (10), and the third optical fiber temperature sensor (12) is fixed to the surface of the protective layer (10) by means of a clamp.

4. A temperature-sensitive fireproof cable according to claim 3, characterized in that: The temperature measuring unit (2) comprises a first optical fiber temperature sensor (201) and a plurality of brackets (202); the plurality of brackets (202) are arranged in the gaps between the corresponding plurality of cable cores (1) and are adapted to the gaps between the plurality of cable cores (1); and the optical fiber of the first optical fiber temperature sensor (201) is arranged on the plurality of brackets (202).

5. A temperature-sensitive fireproof cable according to claim 4, characterized in that: The first insulating layer (3) and the second insulating layer (6) are both PVC material layers, the first fire-resistant layer (4) and the second fire-resistant layer (9) are both ceramic silicone rubber layers, the filling layer (5) is fire-resistant cotton, the oxygen-isolating layer (8) is a ceramic polyolefin layer, and the heat-insulating layer (7) is a high-temperature glass fiber cloth layer.

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