CN113241222B

CN113241222B - 1E-grade cable for harsh environment of third-generation and above nuclear power station

Info

Publication number: CN113241222B
Application number: CN202110385329.4A
Authority: CN
Inventors: 蒋建中; 林霖; 冯国五; 吴维; 田忠
Original assignee: Yangzhou Shuguang Cable Co Ltd
Current assignee: Yangzhou Shuguang Cable Co Ltd
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2022-08-16
Anticipated expiration: 2041-04-09
Also published as: CN113241222A

Abstract

The application discloses nuclear power station harsh environment is with 1E level cable more than and in third generation includes oversheath, interior sheath, total shielding layer and separates the oxygen layer in proper order from outside to inside, it has the cable core in the oxygen layer to separate, the cable core includes the branch item shielding layer in proper order from outside to inside and around the covering, the heart yearn has around the covering in situ, the heart yearn includes external insulation layer, internal insulation layer and conductor in proper order from outside to inside. The cable has good mechanical properties, shielding, insulating and flame-retardant properties, and is suitable for use in harsh environments.

Description

1E-grade cable for harsh environment of third-generation and above nuclear power station

Technical Field

The application relates to a cable patent, in particular to a 1E-level cable for the harsh environment of a third generation and above nuclear power station.

Background

Cables are made of one or more mutually insulated conductors and an outer insulating sheath that carries power or information from one point to another. The cable of the nuclear power station is divided into different types according to different use occasions, the requirements are different, and the cable of the nuclear power station refers to raw materials used for the cable insulation and the sheath of the nuclear power station and comprises various types such as plastics, rubber and the like. In addition, because the cable of the nuclear power plant is used in a harsh environment and involves a heavy nuclear power facility, the cable is required to be protected particularly, good shielding characteristics and mechanical performance are required, and the cable is required to be prevented from being damaged by mechanical scraping and mouse biting during use, and once damaged, the normal use of the cable can be influenced.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to overcome the defects of the prior art and provides a grade-1E cable for the harsh environment of a third generation and above nuclear power station.

The technical scheme is as follows: the utility model provides a nuclear power station harsh environment is with 1E level cable of third generation and above includes oversheath, interior sheath, total shield layer and separates the oxygen layer from outside to inside in proper order, it has the cable core in the oxygen layer to separate, the cable core includes the branch item shielding layer in proper order and winds the covering from outside to inside, it has the heart yearn in the covering to wind, the heart yearn includes external insulation layer, internal insulation layer and conductor from outside to inside in proper order.

Further, the conductor is a tinned conductor, the inner insulating layer is high-electrical performance crosslinked polyethylene, and the outer insulating layer is high-flame-retardant performance crosslinked polyethylene.

Furthermore, the wrapping layer is a halogen-free high-resistance band, the item shielding layer is an aluminum-plastic composite band, and the oxygen isolation layer is made of a halogen-free flame-retardant material; the total shielding layer is made of tinned copper wire, and the outer sheath is made of cross-linked polyethylene.

Furthermore, a plurality of protection units are arranged between the outer sheath and the inner sheath, the protection units are distributed at equal intervals in an annular manner, a plurality of limiting grooves extending along the length direction of the cable are formed in the outer side of the inner sheath, the number of the protection units is equal to the number of the limiting grooves, the protection units correspond to the limiting grooves in one-to-one manner, each protection unit comprises an inner support unit and a plurality of anti-biting units arranged in a row, each inner support unit comprises a supporting sheet in an arc shape and a limiting sheet which is connected with the supporting sheet and inserted into the corresponding limiting groove, folding edges are arranged on two sides of the supporting sheet, slots extending along the length direction of the cable are formed between the folding edges and the supporting sheet, each anti-biting unit comprises an intermediate container in an arc shape, two arc-shaped rods and two anti-biting plates in an arc shape, the intermediate container is positioned between the two arc-shaped rods, and a pipeline is connected between each arc-shaped rod and the intermediate container, the pipeline with middle container intercommunication, middle container with the pipeline intussuseption is filled with the dyestuff, the both sides of preventing stinging the board have with slot complex picture peg, the outside of preventing stinging the board has a plurality of spines, the inboard of preventing stinging the board has and is used for holding the pipeline holding tank of pipeline, prevent stinging the board and install between middle container and arc pole.

Furthermore, the number of the protection units and the number of the limiting grooves are 3. It is also possible to provide 4 or 5, but 3 is preferred, so that the cable is protected in the entire circumferential direction.

Further, be connected with 3 pipelines between arc pole and the middle container, the back of preventing biting the board has 3 pipeline holding tanks, every pipeline is located one the pipeline holding tank.

Further, the pipeline is a hose.

Further, the bite-preventing plate is made of plastic.

Further, the outer sheath is extruded from polyethylene.

Has the beneficial effects that: the cable of this application has better mechanical properties, and high fire-retardant, high insulation, high shielding to use under the harsh environment, and have fine preventing and bite the effect, in case take place to bite and can patrol out fast when patrolling in addition, thereby in time maintain.

Drawings

FIG. 1 is a schematic view of a cable from a first perspective;

FIG. 2 is an enlarged view of area A;

FIG. 3 is a schematic view of the cable from a second perspective;

FIG. 4 is an enlarged view of area B;

FIG. 5 is a third perspective view of the cable;

fig. 6 is an enlarged view of the region C.

Detailed Description

Reference numerals: 1.1 a conductor; 1.2 an inner insulating layer; 1.3 an outer insulating layer; 1.4 wrapping a covering; 1.5 split-phase shielding layer; 1.6 oxygen barrier layer; 1.7 total shield layer; 1.8 inner protecting layer; 1.9 limiting grooves; 2.1 supporting sheet; 2.2 limiting pieces; 2.3 folding edges; 3, preventing a bite plate; 3.1 pricking acutely; 3.2, inserting plates; 3.3 accommodating the pipeline; 4.1 an arc-shaped rod; 4.2 pipelines; 4.3 intermediate container.

As shown in fig. 1-6, a nuclear power station cable for harsh environment includes oversheath, interior sheath 1.8, total shielding layer 1.7 and separates oxygen layer 1.6 from outside to inside in proper order, it has the cable core in the oxygen layer 1.6 to separate, the cable core includes branch item shielding layer 1.5 and around covering 1.4 from outside to inside in proper order, have the heart yearn in covering 1.4, the heart yearn includes external insulation layer 1.3, internal insulation layer 1.2 and conductor 1.1 from outside to inside in proper order. The material of each cladding is selected from the group consisting of the conductor 1.1 which is a tin-plated conductor, the inner insulating layer 1.2 which is high electrical performance crosslinked polyethylene, and the outer insulating layer 1.3 which is high flame retardant performance crosslinked polyethylene. The wrapping layer 1.4 is a halogen-free high-resistance band, the sectional shielding layer 1.5 is an aluminum-plastic composite band, and the oxygen isolation layer 1.6 is made of a halogen-free flame-retardant material; the total shield layer 1.7 is made of tinned copper wire and the outer sheath is made of cross-linked polyethylene.

In addition, in order to prevent bite, a plurality of protection units are arranged between the outer sheath and the inner sheath 1.8 and are distributed at equal intervals in an annular manner, a plurality of limiting grooves extending along the length direction of the cable are formed in the outer side of the inner sheath 1.8, the number of the protection units is equal to the number of the limiting grooves, the protection units correspond to the limiting grooves one by one, each protection unit comprises an inner support unit and a plurality of bite-preventing units arranged in a row, each inner support unit comprises a cambered surface-shaped support sheet 2.1 and a limiting sheet 2.2 which is connected with the support sheet 2.1 and is inserted into the limiting grooves, two turned edges 2.3 are arranged on two sides of the support sheet 2.1, a slot extending along the length direction of the cable is formed between the turned edges 2.3 and the support sheet 2.1, each bite-preventing unit comprises a cambered surface-shaped middle container 4.3, two cambered surface-shaped arc-shaped rods 4.1 and two cambered surface-shaped bite-preventing plates 3, the middle container 4.3 is positioned between the two cambered surface-shaped rods 4.1, be connected with pipeline 4.2 between every curved pole 4.1 and the middle container 4.3, pipeline 4.2 with middle container 4.3 intercommunication, middle container 4.3 with pipeline 4.2 intussuseption is filled with the dyestuff, prevent biting the both sides of board 3 have with slot complex picture peg 3.2, prevent biting the outside of board and have a plurality of spines 3.1, prevent biting the inboard of board 3 and have and be used for holding the pipeline holding tank 3.3 of pipeline, prevent biting the board 3 and install between middle container 4.3 and curved pole 4.1.

The quantity of protection unit and spacing groove is 3. Be connected with 3 pipelines between arc pole and the middle container, the back of preventing biting the board has 3 pipeline holding tanks, and every pipeline is located one in the pipeline holding tank, also can set up the pipeline of more quantity as required. The pipeline is a hose. The anti-biting plate is made of plastic.

As shown in the figure, when the cable is manufactured, after the inner protection layer is extruded, the protection unit is installed on the outer side of the inner protection layer, and the outer sheath is extruded on the outer side of the protection unit, so that the overall protection of the cable is realized. To single protection unit, limiting plate and spacing groove cooperation to because spacing groove and limiting plate are all radial, thereby avoided the cable to be excessively buckled, thereby form the protection to the cable, in addition, prevent stinging picture peg and the slot cooperation of board, and prevent stinging the pipeline holding tank at the back of board and hold the pipeline, thereby prevent stinging the unit with each and install in backing sheet department. When using, bite when having the mouse, appear damaged back when the oversheath, the spine portion can prevent further bite of mouse to bite, thereby form the protection to the cable, if there is the mouse to bite and has bitten middle container or pipeline in addition, the dyestuff in middle container and the pipeline can be excessive to the outside of oversheath, thereby when maintainer patrols, discovers the damage very easily, thereby can realize in time maintaining. Because the intermediate container and the plurality of pipelines almost cover the circumferential direction and the length direction of the whole cable, whether the cable is bitten or not is comprehensively monitored, and the inspection of maintenance personnel is facilitated.

In addition, the thickness of the inner protection layer is thick, and two layers of shielding layers and two layers of insulating layers are arranged, so that the whole insulation and shielding effects are good, and the cable can play the effects of sufficient flame retardance, shielding, high and low temperature resistance, insulation and bite prevention for the key region needing to be protected, and can adapt to the use in the harsh environment.

While the invention has been shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.

Claims

1. A1E-level cable for harsh environments of third and above nuclear power stations is characterized by sequentially comprising an outer sheath, an inner sheath, a total shielding layer and an oxygen separation layer from outside to inside, wherein a cable core is arranged in the oxygen separation layer, the cable core sequentially comprises a sub-item shielding layer and a winding layer from outside to inside, a core wire is arranged in the winding layer, and the core wire sequentially comprises an outer insulating layer, an inner insulating layer and a conductor from outside to inside; the conductor is a tinned conductor, the inner insulating layer is high-electrical performance crosslinked polyethylene, and the outer insulating layer is high-flame-retardant performance crosslinked polyethylene; the wrapping layer is a halogen-free high-resistance band, the itemized shielding layer is an aluminum-plastic composite band, and the oxygen isolation layer is made of a halogen-free flame-retardant material; the total shielding layer is made of tinned copper wire, and the outer sheath is made of cross-linked polyethylene; the cable protection device is characterized in that a plurality of protection units are arranged between the outer sheath and the inner sheath, the protection units are distributed at equal intervals in an annular manner, a plurality of limiting grooves extending along the length direction of the cable are formed in the outer side of the inner sheath, the number of the protection units is equal to the number of the limiting grooves, the protection units correspond to the limiting grooves in a one-to-one manner, each protection unit comprises an inner support unit and a plurality of anti-biting units arranged in a row, each inner support unit comprises a supporting sheet in an arc surface shape and a limiting sheet which is connected with the supporting sheet and inserted into the corresponding limiting groove, flanging edges are arranged on two sides of the supporting sheet, slots extending along the length direction of the cable are formed between the flanging edges and the supporting sheet, each anti-biting unit comprises an intermediate container in an arc surface shape, two arc rods and two anti-biting plates in an arc surface shape, the intermediate container is positioned between the two arc rods, a pipeline is connected between each arc rod and the intermediate container, and the pipeline is communicated with the intermediate container, the middle container with the pipeline intussuseption is filled with the dyestuff, prevent stinging the both sides of board have with slot complex picture peg, the outside of preventing stinging the board has a plurality of spines, the inboard of preventing stinging the board has and is used for holding the pipeline holding tank of pipeline, prevent stinging the board and install between middle container and arc pole.

2. The grade 1E cable for harsh environments of third and higher generation nuclear power plants according to claim 1, wherein the number of said protection units and said limiting grooves is 3.

3. The grade 1E cable for harsh environments of third and higher generation nuclear power plants of claim 2, wherein 3 pipes are connected between said arc-shaped rod and said intermediate container, and the back surface of said anti-seizing plate has 3 pipe receiving grooves, each pipe being located in one of said pipe receiving grooves.

4. The class 1E cable for harsh environments of third and higher generation nuclear power plants of claim 1, wherein said conduit is a hose.

5. The grade 1E cable for harsh environments of third and higher nuclear power plants of claim 1, wherein said seizure preventive plate is made of plastic.