1E-grade K1-type high-service-life completely waterproof cable for nuclear power station

Abstract

The utility model discloses a 1E-grade K1-type long-life completely waterproof cable for a nuclear power station, which comprises a conductor and an insulating wire core formed by double insulating layers extruded outside the conductor, the insulating wire core is cabled to form a cable core, a water-blocking tape water-resisting layer and a halogen-free low-smoke flame-retardant tape wrapping layer are sequentially overlapped and wrapped outside the cable core, and the outer side of the cable core is provided with a water-blocking tape water-resisting layer and a halogen-free low-smoke flame-retardant tape wrapping layer. Water-blocking materials are injected among the conductor monofilaments so as to form a continuous waterproof barrier in the longitudinal direction of the conductor. The cable adopts a multi-waterproof design, and water-blocking glue is injected into gaps between the conductor monofilaments and the cable core, so that the longitudinal sealing performance is enhanced. And the insulating layer adopts a double-layer co-extrusion structure, so that the insulation, high-temperature resistance and radiation resistance are improved. The outer layer is overlapped and wrapped with various materials including a polyimide insulating tape, a water-blocking tape and a halogen-free low-smoke flame-retardant tape, and the outer sheath is made of special materials, so that the electrical and mechanical properties are improved, the high temperature resistance and radiation resistance are improved, and the service life is prolonged. An aluminum strip metal water-resisting layer and argon arc welding sealing are adopted, so that the radial water-resisting property is ensured. The overall design is effective waterproof and moistureproof.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field, specifically is 1E level K1 class long life waterproof cable for nuclear power plant. BACKGROUND

[0002] The cable for nuclear power plant is a kind of cable specially used in nuclear power plant for power transmission, and this kind of cable needs to meet the special environmental conditions in nuclear power plant, and needs to have special performance requirements, such as high temperature resistance, high radiation resistance, strong electromagnetic interference resistance and the like, so that its electrical properties and mechanical properties remain stable during operation.

[0003] The existing cable for nuclear power plant, especially the 1E level cable for K1 class in containment vessel, will be damaged in structure and performance under harsh environment, such as high temperature, high radiation, strong electromagnetic interference, frequent or periodic water accumulation and the like, and at the same time, moisture and humidity will form water treeing in insulation during long-term operation of the cable, thereby causing electrical breakdown and affecting the safe operation in nuclear power plant. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to overcome the above-mentioned defects of the cable in the special use environment in the 1E level containment vessel in nuclear power plant in the prior art, and to provide a 1E level long life waterproof cable for nuclear power plant, which has high temperature resistance, high radiation resistance, strong electromagnetic interference resistance, long life, strong waterproofness and excellent mechanical properties.

[0005] Technical scheme: To achieve the above-mentioned purpose, the utility model provides a technical scheme: a 1E level K1 class long life waterproof cable for nuclear power plant, which comprises an insulated core formed by a conductor and a double-layer insulation layer extruded on the conductor, the insulated core is formed into a cable core, a water-blocking tape water-blocking layer and a halogen-free low-smoke flame-retardant tape wrapping layer are overlapped and wrapped outside the cable core in sequence, and water-blocking material is injected between conductor filaments to form a continuous waterproof barrier in the longitudinal direction of the conductor.

[0006] As a further improvement of the utility model, the cable core is formed by a plurality of insulated cores to the right, and water-blocking material is injected into the gap of the cable core to form a continuous waterproof barrier in the longitudinal direction of the cable core.

[0007] As a further improvement of the utility model, the conductor is made of tinned copper filaments.

[0008] As a further improvement of the utility model, the double-layer insulation layer adopts a double-layer co-extrusion structure of irradiation cross-linked polyethylene inner insulation layer and irradiation cross-linked polyolefin outer insulation layer.

[0009] As a further improvement of the utility model, a polyimide insulation tape layer is overlapped and wrapped outside the double-layer insulation layer.

[0010] As a further improvement of the utility model, a layer of aluminum tape is longitudinally wrapped outside the halogen-free low-smoke flame-retardant tape-wrapped layer to form a radial metal water-blocking layer, and the longitudinal wrapping joint is connected by welding sealing.

[0011] As a further improvement of the utility model, a jacket layer is extruded outside the radial metal water-blocking layer to form a radial comprehensive water-blocking layer to block water from entering the cable radially.

[0012] As a further improvement of the utility model, the jacket layer is a thermosetting low-smoke halogen-free flame-retardant polyolefin material.

[0013] Advantages

[0014] 1. Water-blocking glue is injected synchronously between the conductor monofilaments and the cable core voids, which significantly improves the longitudinal sealing performance of the cable.

[0015] 2. The insulation layer adopts a double-layer co-extrusion structure of an irradiation cross-linked polyethylene inner insulation layer and an irradiation cross-linked polyolefin outer insulation layer, which improves the insulation performance of the cable and enhances the high-temperature resistance, radiation resistance and other characteristics of the cable, so that the cable can better adapt to the extreme environment of nuclear power plants and ensure stable operation of the cable under harsh conditions.

[0016] 3. The insulation layer is overlapped and wrapped with a polyimide insulation tape layer, the cable core is overlapped and wrapped with a water-blocking tape water-blocking layer and a halogen-free low-smoke flame-retardant tape-wrapped layer, and the outer jacket is made of a thermosetting low-smoke halogen-free flame-retardant polyolefin material. The cable has excellent electrical and mechanical properties, and also has high-temperature resistance, high radiation resistance, long service life and other properties.

[0017] 4. A layer of aluminum tape is longitudinally wrapped outside the halogen-free low-smoke flame-retardant tape-wrapped layer to form a metal water-blocking layer, and the longitudinal wrapping joint is connected by argon arc welding sealing, which ensures the radial water-blocking performance of the cable. The outer jacket forms a radial comprehensive water-blocking layer with the outer jacket, effectively blocking the path of water entering the cable radially.

[0018] 5. The cable adopts multiple waterproof designs, including water-blocking glue injection between the conductor monofilaments, water-blocking glue injection in the cable core voids, water-blocking tape water-blocking layer, halogen-free low-smoke flame-retardant tape-wrapped layer, metal water-blocking layer and outer jacket. These designs together form a waterproof barrier for the cable, effectively preventing the intrusion of water and moisture, and ensuring the waterproof performance of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the waterproof and fire-resistant rail transit cable of the utility model;

[0020] Explanation of reference numerals in the schematic diagram:

[0021] 1. conductor; 2. water barrier material; 3. irradiation cross-linked polyethylene inner insulation layer; 4. irradiation cross-linked polyolefin outer insulation layer; 5. polyimide insulation tape wrapping layer; 6. water barrier tape water barrier layer; 7. halogen-free low-smoke flame-retardant tape wrapping layer; 8. radial metal water barrier layer; 9. sheath layer. DETAILED DESCRIPTION

[0022] In order to further understand the content of the present application, the present application will be described in detail in combination with the drawings and specific embodiments.

[0023] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0025] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0026] A 1E-class K1-type high-life completely waterproof cable for nuclear power plants comprises a conductor 1 made of high-quality tin-plated copper monofilament tightly pressed and twisted into a circle, which can improve the corrosion resistance and oxidation resistance of the conductor, which is very important for the cable operating in such a harsh environment of high radiation and high temperature in nuclear power plants, and can prolong the service life of the cable. During the twisting process, water barrier material 2 is synchronously injected between the conductor monofilaments, thereby forming a continuous waterproof barrier that prevents water penetration in the length direction of the conductor, improving the longitudinal sealing property of the cable.

[0027] The conductor 1 is extruded with a double-layer insulation layer, the double-layer insulation layer adopts a double-layer co-extrusion structure of an irradiation cross-linked polyethylene inner insulation layer 3+an irradiation cross-linked polyolefin outer insulation layer 4, the double-layer insulation layer is overlapped with a polyimide insulation tape layer 5, the formed insulated wire core is cabled to the right, the cable core is overlapped with a water-blocking tape water-blocking layer 6 and a halogen-free low-smoke flame-retardant tape wrapping layer 7 in sequence, and the water-blocking material 2 is injected into the gaps of the cable core in the cabling process, so that a continuous water-proof barrier for preventing water from penetrating is formed in the length direction of the cable core.

[0028] The halogen-free low-smoke flame-retardant tape wrapping layer 7 is longitudinally wrapped with an aluminum tape to form a radial metal water-blocking layer 8, the longitudinal wrapping joint is sealed and connected by argon arc welding to ensure the radial water-blocking property of the cable, compared with the conventional longitudinal wrapping aluminum plastic composite tape, the longitudinal wrapping joint is more airtight and has no gap, and the radial water-blocking state is completely achieved; the radial metal water-blocking layer is extruded with a layer of thermosetting low-smoke halogen-free flame-retardant polyolefin sheath layer 9, and the radial metal water-blocking layer 8 and the outer sheath layer 9 form a radial comprehensive water-blocking layer to cut off the water from entering the cable in the radial direction.

[0029] The radial metal water-blocking layer 8 is made of an aluminum tape, the aluminum tape plays a shielding role in addition to the water-blocking role, and the anti-strong electromagnetic interference capability of the cable is effectively improved; the insulation layer adopts a double-layer co-extrusion structure, the cable core is overlapped with the polyimide insulation tape layer 5, the water-blocking tape water-blocking layer 6 and the halogen-free low-smoke flame-retardant tape wrapping layer 7, and the sheath layer 9 is made of a thermosetting low-smoke halogen-free flame-retardant polyolefin and the like special material, so that the cable has excellent electrical properties and mechanical properties, and the high-temperature resistance, high-radiation resistance, long service life and the like properties of the cable are improved, and the cable can better adapt to the extreme environment of the nuclear power station.

[0030] Without affecting the electrical properties and mechanical properties of the cable, the water-blocking material is synchronously injected between the conductor filaments and the gaps of the cable core, the water-blocking material is selected to be a water-blocking glue, the longitudinal airtightness of the cable is significantly improved, water and moisture are effectively prevented from entering the cable in the longitudinal direction, the water treeing aging in the insulation layer is avoided, the occurrence of electric breakdown is prevented, and the longitudinal water-blocking property of the cable is effectively improved.

[0031] The utility model and its implementation are described above, the description is not restrictive, and the drawings only show one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if the ordinary skilled person in the art is inspired, without departing from the creative purpose of the utility model, similar structure modes and embodiments are not creatively designed, which should belong to the protection scope of the utility model.

Claims

1. A high life expectancy, completely waterproof cable of Class 1E, Category K1 for nuclear power plants, characterized in that: The cable core is formed by a plurality of the insulated wire cores being cabled to the right, and the water-blocking material is injected into the interspace of the cable core to form a continuous water-blocking barrier in the longitudinal direction of the cable core.

2. The Class 1E, K1, long-life, fully waterproof cable for nuclear power plants according to claim 1, characterized in that: The cable core is formed by a plurality of the insulated wire cores being cabled to the right, and the water-blocking material is injected into the interspace of the cable core to form a continuous water-blocking barrier in the longitudinal direction of the cable core.

3. The Class 1E, K1, long-life, fully waterproof cable for nuclear power plants according to claim 1, characterized in that: The conductor is made of tinned copper monofilament.

4. The Class 1E, K1, long-life, fully waterproof cable for nuclear power plants according to claim 1, characterized in that: The double-layer insulation layer is made of a double-layer co-extrusion structure of an irradiation cross-linked polyethylene inner insulation layer and an irradiation cross-linked polyolefin outer insulation layer.

5. The Class 1E, K1, long-life, fully waterproof cable for nuclear power plants according to claim 1, characterized in that: The double-layer insulation layer is overlapped and wrapped with a polyimide insulation tape layer.

6. The Class 1E, K1, high lifetime, totally waterproof cable for nuclear power plants according to claim 1, characterized in that: The halogen-free low-smoke flame-retardant tape wrapping layer is longitudinally wrapped with an aluminum tape to form a radial metal water-blocking layer, and the longitudinal wrapping joint is sealed and connected by welding.

7. The Class 1E, K1, long-life, fully waterproof cable for nuclear power plants according to claim 6, characterized in that: A jacket layer is extruded outside the radial metal water-blocking layer to form a radial comprehensive water-blocking layer to block water from entering the cable from the radial direction.

8. The Class 1E, K1, long-life, fully waterproof cable for nuclear power plants according to claim 7, characterized in that: The jacket layer is made of a thermosetting low-smoke halogen-free flame-retardant polyolefin material.

Images