1E-level K1-type power cable for fourth-generation nuclear power

Abstract

The utility model discloses a 1E-grade K1-type power cable for fourth-generation nuclear power, and the power cable comprises an outer sheath, an armor layer, a total shielding layer, a water-blocking wrapping layer and a flame-retardant wrapping layer which are sequentially arranged from the outside to the inside, and the interior of the flame-retardant wrapping layer is provided with a first supporting unit, a second supporting unit and a cable core. Each cable core comprises a conductor, an inner insulating layer, an outer insulating layer, a sub-shielding layer and an inner flame-retardant layer which are sequentially arranged from inside to outside, and the number of the first supporting units, the number of the second supporting units and the number of the cable cores are all three. The power cable is provided with the first supporting unit and the second supporting unit, so that good mechanical protection is realized, the internal structure of the cable is effectively supported and protected, the influence of external force on the cable is reduced, and the service life of the cable is prolonged. The power cable provided by the utility model has good mechanical property, flame retardant property, water blocking property, shielding property and insulating property, can provide reliable power transmission guarantee, and meets the requirements of 1E-grade K1-type power cables of a nuclear power station.

Description

Technical Field

[0001] The utility model relates to the field of cables, and more specifically to a 1E-level K1 type power cable for fourth-generation nuclear power. Background Art

[0002] The 1E-level K1 power cable for the fourth-generation nuclear power refers to the power cable that meets the safety level of nuclear power plants of 1E and quality level of K1. In nuclear power plants, the reliability and safety of power cables are crucial to ensure the normal operation of nuclear power plants and the safety of personnel.

[0003] The existing common power cables have weak flame retardancy, and it is difficult to slow down the further spread of fire in the event of a fire, and the safety of the cables cannot be ensured. In addition, the shielding and insulation performance of common power cables cannot meet the use requirements of nuclear power plants, and it is difficult to ensure the safety and reliability of the power system. They are easily disturbed by external magnetic fields, resulting in unstable signal transmission and poor transmission quality. In addition, common power cables cannot meet the use requirements of nuclear power plants. Nuclear power cables need to have good mechanical strength to withstand the external pressure during installation, transportation and use. Utility Model Content

[0004] The utility model aims to overcome the defects of the prior art and provides a 1E-level K1 type power cable for fourth-generation nuclear power.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a power cable, comprising an outer sheath, an armor layer, a general shielding layer, a water-blocking wrapping layer and a flame-retardant wrapping layer arranged in sequence from the outside to the inside, a first support unit, a second support unit and a cable core are arranged in the flame-retardant wrapping layer, the cable core comprises a conductor, an inner insulating layer, an outer insulating layer, a sub-item shielding layer and an inner flame-retardant layer arranged in sequence from the inside to the outside, the first and second support units and the cable core each have three, the three first support units surround and form an accommodating cavity for accommodating the three cable cores, the first support unit comprises a first support bar with an arc-shaped cross section, one side of the first support bar has a side convex edge, and the other side has a side convex edge. The side groove portion is matched with the convex edge, the side convex edge of one of the two adjacent first support bars is accommodated in the side groove portion of the other first support bar, the outer side of the first support bar has a plurality of strip-shaped convex rib portions, the second support unit includes a second support bar with an arc-shaped cross-section and arranged opposite to the arc of the first support bar, both sides of the second support bar have embedded bars, the inner side of the first support bar has a strip-shaped embedded groove matching the embedded bar, the second support bar has a plurality of buffer support portions on a side close to the first support bar, and the second support bar has a support protrusion with a semicircular cross-section on a side away from the first support bar, and the support protrusion can abut against two adjacent cable cores.

[0006] Furthermore, the first support unit is formed by integral extrusion, and the second support unit is formed by integral extrusion.

[0007] Therefore, the first and second supporting units have stable structures and good sealing properties, thereby ensuring the structural stability of the cable.

[0008] Furthermore, the first and second supporting units are both made of polyethylene material.

[0009] Thus it has good insulation performance, corrosion resistance and mechanical properties.

[0010] In some embodiments, the first and second supporting units are both made of nylon material.

[0011] In some embodiments, the first and second supporting units are both made of PVC material.

[0012] In some embodiments, the first and second supporting units are both made of silicone rubber material.

[0013] Furthermore, the inner insulating layer is made of polyethylene material, and the outer insulating layer is made of silicone rubber material.

[0014] Therefore, the cable has good insulation performance, high temperature heat resistance and weather resistance.

[0015] Furthermore, the outer sheath is made of polyethylene material.

[0016] Therefore, the cable has better wear resistance and corrosion resistance.

[0017] Furthermore, the flame retardant wrapping layer is formed by wrapping with mica tape.

[0018] Thereby providing the cable with better flame retardant properties.

[0019] Furthermore, the sub-item shielding layer is a copper wire braided shielding layer.

[0020] This can effectively protect the signal from external interference and improve the quality and reliability of signal transmission.

[0021] Furthermore, the embedded strip, the buffer support portion, the supporting protrusion portion, and the strip-shaped convex rib portion all extend along the length direction of the cable core.

[0022] Thereby the cable can obtain stronger mechanical properties.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] 1. The power cable of the present application is equipped with a first supporting unit and a second supporting unit, thereby achieving good mechanical protection, effectively supporting and protecting the internal structure of the cable, reducing the impact of external forces on the cable, and thus extending the service life of the cable.

[0025] 2. The power cable of the present application has excellent mechanical properties, flame retardant properties, water-blocking properties, shielding properties and insulation properties, can provide reliable power transmission guarantee, and meets the requirements of Class 1E K1 power cables for nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of cable structure;

[0027] Figure 2 This is an enlarged schematic diagram of area A;

[0028] Figure 3 It is a schematic diagram of component separation;

[0029] Figure 4 This is a magnified schematic diagram of area B.

[0030] Explanation of the reference numerals: 1.1 outer sheath; 1.2 armor layer; 1.3 overall shielding layer; 1.4 water-blocking wrapping layer; 1.5 flame-retardant wrapping layer; 2 first supporting unit; 2.1 first supporting bar; 2.2 side flange; 2.3 side groove portion; 2.4 strip-shaped rib portion; 2.5 strip-shaped embedded groove; 3 second supporting unit; 3.1 second supporting bar; 3.2 embedded bar; 3.3 buffer supporting portion; 3.4 supporting protrusion; 4 cable core; 4.1 conductor; 4.2 inner insulating layer; 4.3 outer insulating layer; 4.4 sub-shielding layer; 4.5 inner flame-retardant layer. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The utility model provides Figure 1-4A power cable is shown, comprising an outer sheath 1.1, an armor layer 1.2, a general shielding layer 1.3, a water-blocking wrapping layer 1.4 and a flame-retardant wrapping layer 1.5, which are arranged in sequence from the outside to the inside; a first support unit 2, a second support unit 3 and a cable core 4 are arranged in the flame-retardant wrapping layer 1.5; the cable core 4 comprises a conductor 4.1, an inner insulating layer 4.2, an outer insulating layer 4.3, a sub-item shielding layer 4.4 and an inner flame-retardant layer 4.5, which are arranged in sequence from the inside to the outside; there are three first support units, three second support units and three cable cores 4, and the three first support units 2 surround and form a housing cavity for accommodating the three cable cores 4; the first support unit 2 comprises a first support bar 2.1 with an arc-shaped cross-section, one side of the first support bar 2.1 has a side convex edge 2.2, and the other side has a side concave side matching the side convex edge. Groove portion 2.3, the side convex edge of one of the two adjacent first support bars is accommodated in the side groove portion of the other first support bar, the outer side of the first support bar 2.1 has a plurality of strip-shaped convex ribs 2.4, the second support unit 3 includes a second support bar 3.1 with an arc-shaped cross-section and arranged opposite to the arc of the first support bar, both sides of the second support bar 3.1 have embedded bars 3.2, the inner side of the first support bar 2.1 has a strip-shaped embedded groove 2.5 matching the embedded bar 3.2, the side of the second support bar 3.1 close to the first support bar has a plurality of buffer support portions 3.3, the side of the second support bar 3.1 away from the first support bar has a support protrusion 3.4 with a semicircular cross-section, and the support protrusion 3.4 can abut against two adjacent cable cores 4.

[0033] The first support unit 2 is integrally extruded, and the second support unit 3 is integrally extruded; the first and second support units are both made of polyethylene material; the inner insulation layer 4.2 is made of polyethylene material, and the outer insulation layer 4.3 is made of silicone rubber material; the outer sheath 1.1 is made of polyethylene material; the flame retardant wrapping layer 1.5 is wrapped with mica tape; the sub-item shielding layer 4.4 is a copper wire braided shielding layer; the embedded strip 3.2, the buffer support part 3.3, the support protrusion part 3.4, and the strip convex rib part 2.4 all extend along the length direction of the cable core 4.

[0034] Working principle: The power cable of the present application is equipped with a first support unit and a second support unit, so as to achieve good mechanical protection, effectively support and protect the internal structure of the cable, reduce the impact of external forces on the cable, and thus extend the service life of the cable. The outer sheath and armor layer of the power cable of the present application further provide mechanical protection for the cable; the flame retardant sheath and the inner flame retardant layer provide the cable with good flame retardant performance, which can prevent the further spread of the fire in the event of a fire and reduce the losses caused by the fire; the water-blocking sheath can effectively prevent moisture from entering the cable and maintain the normal use of the cable; the setting of the total shielding layer and the sub-shielding layer enables the cable to have good shielding performance, which can effectively suppress external electromagnetic interference, reduce the possibility of signal interference, and improve the stability and reliability of the cable transmission signal; the inner insulation layer and the outer insulation layer enable the cable to have good insulation performance, which can effectively isolate and protect the internal conductor of the cable and prevent current leakage and faults. Therefore, the power cable of the present application can provide reliable power transmission guarantee and meet the requirements of Class 1E K1 power cables of nuclear power plants.

[0035] Although the present invention has been illustrated and described with respect to preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. The fourth generation nuclear power 1E class K1 power cable is characterized by: The cable core comprises an outer sheath, an armor layer, a general shielding layer, a water-blocking wrapping layer and a flame-retardant wrapping layer which are sequentially arranged from the outside to the inside, wherein a first support unit, a second support unit and a cable core are arranged in the flame-retardant wrapping layer, and the cable core comprises a conductor, an inner insulating layer, an outer insulating layer, a sub-item shielding layer and an inner flame-retardant layer which are sequentially arranged from the inside to the outside, and there are three first support units, three second support units and three cable cores, and the three first support units surround and form a receiving cavity for receiving the three cable cores, and the first support unit comprises a first support bar with an arc-shaped cross section, one side of the first support bar has a side convex edge, and the other side has a side groove portion matching the side convex edge, and two adjacent first support units are connected to each other. A side convex edge of one of the first support bars of a support bar is accommodated in a side groove portion of another first support bar, the outer side of the first support bar has a plurality of strip-shaped convex rib portions, the second support unit includes a second support bar with an arc-shaped cross-section and arranged opposite to the arc of the first support bar, both sides of the second support bar have embedded bars, the inner side of the first support bar has a strip-shaped embedded groove matching the embedded bar, the side of the second support bar close to the first support bar has a plurality of buffer support portions, and the side of the second support bar away from the first support bar has a support protrusion with a semicircular cross-section, and the support protrusion can abut against two adjacent cable cores.

2. The fourth generation nuclear power 1E class K1 power cable according to claim 1, characterized in that: The first support unit is formed by integral extrusion, and the second support unit is formed by integral extrusion.

3. The fourth generation nuclear power 1E class K1 power cable according to claim 1, characterized in that: The first and second supporting units are both made of polyethylene material.

4. The fourth generation nuclear power 1E class K1 power cable according to claim 1, characterized in that: The inner insulating layer is made of polyethylene material, and the outer insulating layer is made of silicone rubber material.

5. The fourth generation nuclear power 1E class K1 power cable according to claim 1, characterized in that: The outer sheath is made of polyethylene material.

6. The fourth generation nuclear power 1E class K1 power cable according to claim 1, characterized in that: The flame retardant wrapping layer is formed by wrapping with mica tape.

7. The fourth generation nuclear power 1E class K1 power cable according to claim 1, characterized in that: The sub-item shielding layer is a copper wire braided shielding layer.

8. The fourth generation nuclear power 1E class K1 power cable according to claim 1, characterized in that: The embedding strip, the buffer support portion, the support protrusion portion, and the strip-shaped convex rib portion all extend along the length direction of the cable core.

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