Radiation-resistant and high-temperature-resistant control cable for hydrogen combustion and explosion environment

Abstract

The utility model relates to the technical field of a cable for a nuclear power station, and discloses a radiation-resistant and high-temperature-resistant control cable for a hydrogen blast environment, which is characterized by comprising a wire core, a low-smoke halogen-free high-temperature-resistant filler 4, a belting layer 5, a shielding layer 6, a buffer layer 7, an outer sheath 8 and an outer protective layer 9, wherein the cabling comprises a conductor 1, a conductor wrapping layer 2 and an insulating layer 3 which are sequentially arranged from inside to outside.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and particularly relates to a radiation-resistant and high-temperature-resistant control cable for a hydrogen combustion explosion environment. Background Art

[0002] Hydrogen combustion explosion in a nuclear power plant is a chemical reactive explosion occurring inside the nuclear power plant. Especially when the safety system fails and the reactor becomes high-temperature, the hydrogen generated by the zirconium-water reaction accumulates inside the containment vessel. When mixed with air and encountering a fire source, an explosion will be triggered. Hydrogen combustion explosion may cause damage to the structure of the nuclear power plant, and further affect the cooling and protection systems of the reactor. In the most serious cases, it may lead to the leakage of radioactive substances, posing a threat to the environment and public health.

[0003] To avoid the occurrence of hydrogen combustion explosion, multiple hydrogen ignition devices are installed inside the containment vessel to reduce the pressure inside the containment vessel by igniting hydrogen in advance. Such a hydrogen igniter assembly requires the use of a dedicated control cable.

[0004] At present, the wire and cable products used in nuclear power plants are basically all domestically produced independently. However, for the cables supporting some key equipment in nuclear power plants, they still rely on foreign imports. Domestic cables cannot meet the usage environment requirements and performance requirements of nuclear power plants.

[0005] The cable supporting the hydrogen igniter assembly is required to have radiation resistance and high-temperature resistance. At the same time, it is required that the highest working temperature of the cable reaches 125°C, and the overall cable has a certain mechanical strength and impact resistance.

[0006] The publication number CN211654406U discloses a high-temperature-resistant and low-voltage power cable for a hydrogen combustion explosion environment. The cable includes: a conductor, an insulating layer, a glass braid, a filler, a tape, and an outer sheath; the insulating layer is a high-temperature-resistant and radiation-resistant silicone rubber, extruded outside the stranded conductor. There are gaps in the outer layer of the stranded conductor, and when the insulating layer is extruded, it is easy to embed into the gaps, resulting in uneven thickness of the insulating layer and defects. The outer sheath is composed of a stainless steel wire braid, braided outside the fiberglass tape. The fiberglass tape is a braided flame-retardant tape with multiple gaps. During the stainless steel wire braiding process, the stainless steel wire may penetrate into the gaps of the tape, leading to abnormal processing conditions. The cable structure lacks a shielding layer and is easily affected by electromagnetic interference, and cannot replace the control cable for accurate transmission of control signals. Summary of the Invention

[0007] The purpose of the utility model: Based on the above technical problems, a radiation-resistant and high-temperature-resistant control cable for a hydrogen combustion explosion environment is provided.

[0008] To achieve the above objectives, the first aspect of this utility model provides a radiation-resistant and high-temperature-resistant control cable for hydrogen combustion and explosion environments. The cable includes: a conductor, a low-smoke halogen-free high-temperature-resistant filler 4, a wrapping layer 5, a shielding layer 6, a buffer layer 7, an outer sheath 8, and an outer protective layer 9.

[0009] The cable assembly includes a conductor 1, a conductor wrapping layer 2, and an insulation layer 3 arranged sequentially from the inside out.

[0010] Preferably, in the cable, there are 2 or 4 conductors, and the conductor cross-sectional area is 0.5 to 6 mm². 2 .

[0011] More preferably, in the cable, the conductor 1 is made of m strands of nickel-plated copper wire, and m is 7 to 19.

[0012] Preferably, in the cable, both the conductor wrapping layer 2 and the wrapping layer 5 are polyimide film tapes with a thickness of 0.04 to 0.05 mm.

[0013] In a preferred embodiment, the insulation layer 3 in the cable is a polyetheretherketone layer with a thickness of 0.4 to 0.6 mm.

[0014] More preferably, in the cable, the shielding layer 6 is made of tin-plated copper wire with a diameter of 0.12 to 0.15 mm and a braiding density of >85%.

[0015] Preferably, in the cable, the buffer layer 7 is a ceramicized silicone rubber tape with a thickness of 0.8 to 1.0 mm.

[0016] Preferably, in the cable, the outer sheath 8 is made of vulcanized silicone rubber with a thickness of 0.3 to 0.5 mm through extrusion.

[0017] More preferably, in the cable, the outer sheath 9 is woven from stainless steel wire with a diameter of 0.15 to 0.20 mm and a weaving density of ≥90%.

[0018] The cable provided by this utility model has at least the following beneficial effects:

[0019] (1) In the cable provided by this utility model, the conductor wrapping layer is selected as polyimide film, which has excellent heat resistance, strong chemical stability, good heat insulation effect and high electrical performance, and is a double guarantee for improving insulation and electrical performance.

[0020] (2) In the cable provided by this utility model, the insulation layer is made of polyetheretherketone (PEEK), which has high mechanical strength, high temperature resistance, impact resistance, flame retardancy, acid and alkali resistance, hydrolysis resistance, wear resistance, fatigue resistance, radiation resistance, and excellent electrical properties. It is extruded onto the outside of a polyimide film through an extrusion process. Its thermal life is greater than 60 years, and it can withstand an irradiation dose of 250 kGy (γ-rays), meeting the environmental conditions for hydrogen igniter components.

[0021] (3) In the cable provided by this utility model, the shielding layer is made of tin-plated copper wire braided shielding with a braiding density of more than 85%, which can effectively shield external electromagnetic interference and ensure the accuracy of control signal transmission.

[0022] (4) In the cable provided by this utility model, the buffer layer is wrapped with ceramicized silicone rubber tape outside the shielding layer, so that the cable can operate stably for a certain period of time under the conditions of combustion and water spray.

[0023] (5) In the cable provided by this utility model, the outer sheath is made of high temperature resistant and radiation resistant vulcanized silicone rubber, and the thermal life of the vulcanized silicone rubber can reach 60 years.

[0024] (6) In the cable provided by this utility model, the outer sheath is braided with stainless steel wire, which improves the overall mechanical strength of the cable and gives it good bending performance. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the cable prepared according to Embodiment 1 of this utility model;

[0026] Figure 2 This is a cross-sectional view of the cable prepared according to Embodiment 2 of this utility model.

[0027] Explanation of reference numerals in the attached figures

[0028] 1. Conductor 2. Conductor cladding

[0029] 3. Insulation layer; 4. Low-smoke, halogen-free, high-temperature resistant filler.

[0030] 5. Encasing layer 6. Shielding layer

[0031] 7. Buffer layer 8. Outer sheath

[0032] 9. Outer protective layer Detailed Implementation

[0033] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0034] This utility model provides a radiation-resistant and high-temperature-resistant control cable for hydrogen combustion and explosion environments. The cable includes: a conductor, a low-smoke halogen-free high-temperature-resistant filler 4, a wrapping layer 5, a shielding layer 6, a buffer layer 7, an outer sheath 8, and an outer protective layer 9.

[0035] The cable includes a conductor 1, a conductor wrapping layer 2, and an insulation layer 3 arranged sequentially from the inside out.

[0036] To match the hydrogen igniter, the cable preferably has 2 or 4 cores with a cross-sectional area of ​​0.5–6 mm². 2 .

[0037] To improve the high-temperature oxidation resistance, wear resistance and corrosion resistance of conductor 1, a multi-nickel-plated copper wire stranded structure is adopted to improve the conductor's flexibility. In the cable, conductor 1 is preferably made of m stranded nickel-plated copper wires, and m is 7 to 19.

[0038] In order to improve the thermal stability, electrical insulation performance and radiation resistance of the cable core, the conductor wrapping layer 2 and the wrapping layer 5 in the cable are preferably polyimide film tapes with a thickness of 0.04 to 0.05 mm.

[0039] In order for the cable to operate in high temperature and radiation environments and to ensure that the cable insulation performance meets the requirements, the insulation layer 3 in the cable is preferably a polyetheretherketone layer with a thickness of 0.4 to 0.6 mm.

[0040] To improve the electromagnetic interference resistance of the cable, the shielding layer 6 in the cable is made of tin-plated copper wire with a diameter of 0.12 to 0.15 mm and a braiding density of >85%.

[0041] In order to reduce the damage to the inside of the cable caused by external forces and reduce external buffering, the buffer layer 7 in the cable is preferably a ceramicized silicone rubber tape with a thickness of 0.8 to 1.0 mm.

[0042] To further improve the radiation resistance of the cable, the outer sheath 8 of the cable is preferably extruded from vulcanized silicone rubber with a thickness of 0.3 to 0.5 mm.

[0043] To improve the cable's abrasion resistance and ensure a small bending radius, the outer sheath 9 of the cable is made of stainless steel wire with a diameter of 0.15 to 0.20 mm and a braiding density of ≥90%.

[0044] See Figure 1 In this embodiment, the cable has two conductors.

[0045] In this embodiment, the conductor 1 is formed by stranding seven nickel-plated copper wires, with the outermost layer of the conductor 1 stranded in a left-hand direction, and the adjacent layers of the conductor 1 stranded in opposite directions; the stranding pitch is 8 to 10 times. Under the above conditions, the resulting conductor 1 has better flexibility.

[0046] In this embodiment, the conductor wrapping layer 2 is a polyimide film strip with a thickness of 0.04 mm, wrapped around the outside of the conductor 1; and the wrapping overlap rate of the single-layer polyimide film is ≥25%.

[0047] In this embodiment, the insulating layer 3 is a polyetheretherketone layer with a thickness of 0.5 mm, which is uniformly extruded onto the outside of the conductor wrapping layer 2 using an extruder with an extrusion die.

[0048] In this embodiment, the shielding layer 6 is woven from tin-plated copper wire with a diameter of 0.12 mm and a weaving density of 85%.

[0049] In this embodiment, the buffer layer 7 is a ceramicized silicone rubber tape with a thickness of 0.8 mm.

[0050] In this embodiment, the outer sheath 8 is made of vulcanized silicone rubber with a thickness of 0.5 mm through extrusion.

[0051] In this embodiment, the outer protective layer 9 is woven from stainless steel wire with a diameter of 0.15 mm and a weaving density of 90%.

[0052] See Figure 2 In this embodiment, the cable has four wire cores.

[0053] In this embodiment, the conductor 1 is formed by stranding seven nickel-plated copper wires, with the outermost layer of the conductor 1 stranded in a left-hand direction, and the adjacent layers of the conductor 1 stranded in opposite directions; the stranding pitch is 8 to 10 times. Under the above conditions, the resulting conductor 1 has better flexibility.

[0054] In this embodiment, the conductor wrapping layer 2 is a polyimide film strip with a thickness of 0.04 mm, wrapped around the outside of the conductor 1; and the wrapping overlap rate of the single-layer polyimide film is ≥25%.

[0055] In this embodiment, the insulating layer 3 is a polyetheretherketone layer with a thickness of 0.6 mm, which is uniformly extruded onto the outside of the conductor wrapping layer 2 using an extruder with an extrusion die.

[0056] In this embodiment, the shielding layer 6 is woven from tin-plated copper wire with a diameter of 0.15 mm and a weaving density of 85%.

[0057] In this embodiment, the buffer layer 7 is a ceramicized silicone rubber tape with a thickness of 1.0 mm.

[0058] In this embodiment, the outer sheath 8 is made of vulcanized silicone rubber with a thickness of 0.3 mm through extrusion.

[0059] In this embodiment, the outer protective layer 9 is woven from stainless steel wire with a diameter of 0.20 mm and a weaving density of 90%.

[0060] Through the above technical solutions, nickel-plated copper wire can prevent oxidation of conductor 1 caused by high-temperature environments. The conductor wrapping layer 2 uses polyimide film tape with a temperature resistance of up to 250℃, providing double protection for electrical insulation. The insulation layer 3 uses polyetheretherketone (PEEK), which has high mechanical strength, high temperature resistance, impact resistance, flame retardancy, acid and alkali resistance, hydrolysis resistance, wear resistance, fatigue resistance, radiation resistance, and excellent electrical properties. It is extruded onto the outer layer of conductor wrapping layer 2 using an extrusion process. Low-smoke halogen-free, high-temperature resistant filler 4 is used to fill gaps in the cabling process, ensuring the roundness of the control cable. Polyimide film tape is then used for cabling and wrapping, with an overlap rate >15%. The shielding layer 6 uses tin-plated copper wire braided shielding with a braiding density >85%, effectively shielding against external electromagnetic interference and ensuring the accuracy of control signal transmission. The buffer layer 7 uses ceramicized silicone rubber tape wrapped around the shielding layer 6, enabling the cable to operate stably for a certain period under conditions of combustion and water spray. The outer sheath 8 uses high-temperature resistant and radiation-resistant vulcanized silicone rubber. Both polyetheretherketone (PEEK) and vulcanized silicone rubber have a thermal life of up to 60 years. The outer sheath 9 is braided with stainless steel wire, which improves the overall mechanical strength of the cable and gives it better bending performance.

[0061] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed by this utility model and are all within the protection scope of this utility model.

Claims

1. A radiation-resistant and high-temperature-resistant control cable for use in hydrogen explosion environments, characterized in that, The cable includes: core, low smoke halogen-free high temperature resistant filler (4), wrapping layer (5), shielding layer (6), buffer layer (7), outer sheath (8), and outer protective layer (9); The wire core includes a conductor (1), a conductor wrapping layer (2), and an insulation layer (3) arranged sequentially from the inside out.

2. The cable according to claim 1, characterized in that, In the cable, there are 2 or 4 conductors, and the conductor cross-sectional area is 0.5 to 6 mm². 2 .

3. The cable according to claim 1 or 2, characterized in that, In the cable, the conductor (1) is made of m strands of nickel-plated copper wire, and m is 7 to 19.

4. The cable according to claim 1 or 2, characterized in that, In the cable, the conductor wrapping layer (2) and the wrapping tape layer (5) are both polyimide film tapes with a thickness of 0.04 to 0.05 mm.

5. The cable according to claim 1 or 2, characterized in that, In the cable, the insulation layer (3) is a polyetheretherketone layer with a thickness of 0.4 to 0.6 mm.

6. The cable according to claim 1 or 2, characterized in that, In the cable, the shielding layer (6) is made of tin-plated copper wire with a diameter of 0.12 to 0.15 mm and a braiding density of >85%.

7. The cable according to claim 1 or 2, characterized in that, In the cable, the buffer layer (7) is a ceramicized silicone rubber tape with a thickness of 0.8 to 1.0 mm.

8. The cable according to claim 1 or 2, characterized in that, In the cable, the outer sheath (8) is made of vulcanized silicone rubber with a thickness of 0.3 to 0.5 mm.

9. The cable according to claim 1 or 2, characterized in that, In the cable, the outer sheath (9) is made of stainless steel wire with a diameter of 0.15 to 0.20 mm and a braiding density of ≥90%.

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