CN217690608U - High-voltage coaxial cable for 150kV electron beam welding equipment - Google Patents

Abstract

The application discloses high voltage coaxial cable that 150kV electron beam welding equipment used. The method comprises the following steps: the device comprises a conductor layer, an outer shielding layer and an outer protection layer, wherein the conductor layer is sleeved with a first conductor, a first PE (polyethylene) insulating layer, a second conductor, an inner shielding layer and a third conductor from inside to outside in sequence; two ends of the first conductor, the second conductor and the third conductor are respectively connected with a 150kV high-voltage power supply and an electron gun and are used for conducting electricity of the cable; the inner shielding layer is sequentially sleeved with a first semi-conductive layer, a second PE insulating layer and a second semi-conductive layer from inside to outside and used for eliminating air gaps on the surface of a conductor, homogenizing an electric field on the surface of the conductor, and inhibiting branch initiation and heat shielding; the conductive layer overcoat is equipped with outer shielding layer, and outer shielding layer includes third semi-conductive layer, first semi-conductive PE layer, third PE insulating layer, second semi-conductive PE layer and ground shield layer for eliminate the air gap between insulating layer and the outer metal shielding layer, shield partial discharge and electric branch.

Description

High-voltage coaxial cable for 150kV electron beam welding equipment

Technical Field

The disclosure relates to the field of electron beam welding equipment, in particular to a high-voltage coaxial cable for 150kV electron beam welding equipment.

Background

At present, a high-voltage power supply of electron beam welding equipment and a connecting cable of an electron gun mostly adopt a plurality of forms, the cost is high, the anti-electromagnetic interference capability to the outside is weak, cable connection joints are required to be invaded into transformer oil, great inconvenience is brought to maintenance and equipment replacement, the transformer oil is required to be contacted, oil pollution is generated, the transformer oil pollution not only influences the appearance quality of a transformer, but also influences the equipment management, the environment is polluted, and the transformer can be changed from a sealing state to a non-sealing state, so that moisture is caused to enter, the safe and stable operation of the transformer is influenced, and even the transformer is stopped. Therefore, we propose a high voltage coaxial cable for 150kV electron beam welding equipment to solve the above problems.

Disclosure of Invention

In view of the above-mentioned drawbacks and deficiencies of the prior art, it would be desirable to provide a high voltage coaxial cable for a 150kV electron beam welding apparatus that is low cost, strong against electromagnetic interference, and easy to install.

In a first aspect, the present application provides a high voltage coaxial cable for a 150kV electron beam welding apparatus, comprising:

the conductive layer is sleeved with a first conductor, a first PE insulating layer, a second conductor, an inner shielding layer and a third conductor from inside to outside in sequence;

the inner shielding layer is sequentially sleeved with a first semi-conductive layer, a second PE insulating layer and a second semi-conductive layer from inside to outside;

the conductor layer overcoat is equipped with outer shielding layer, outer shielding layer includes third semi-conductive layer, first semi-conductive PE layer, third PE insulating layer, second semi-conductive PE layer and ground shield layer.

According to the technical scheme provided by the embodiment of the application, the outer protective layer is sleeved outside the outer shielding layer.

According to the technical scheme provided by the embodiment of the application, the first conductor is a solid bare copper wire with the diameter of 2.8 +/-0.05 mm.

According to the technical scheme provided by the embodiment of the application, the second conductor is a bare copper wire with the diameter of phi 0.3mm, the bare copper wire is woven into a net structure, and the outer diameter of the second conductor is phi 6.5 +/-0.2 mm after weaving.

According to the technical scheme provided by the embodiment of the application, the third conductor is a bare copper wire with the diameter of phi 0.25mm, the bare copper wire is woven into a net structure, and the outer diameter of the net structure after weaving is phi 13.1 +/-0.3 mm.

According to the technical scheme provided by the embodiment of the application, the first PE insulating layer, the second PE insulating layer and the third PE insulating layer are all made of cross-linked polyethylene materials, and the outer diameters of the cross-linked polyethylene materials after molding are respectively phi 5.2 +/-0.2 mm, phi 11.6 +/-0.3 mm and phi 45 +/-0.5 mm.

According to the technical scheme provided by the embodiment of the application, the first semi-conductive layer, the second semi-conductive layer and the third semi-conductive layer are formed by impregnating and winding a nylon tape through semi-conductive glue, and the outer diameters of the wound nylon tape are phi 6.9 +/-0.2 mm, phi 12 +/-0.3 mm and phi 13.5 +/-0.3 mm respectively.

According to the technical scheme provided by the embodiment of the application, the outer diameters of the first semiconductive PE layer and the second semiconductive PE layer are phi 15 +/-0.3 mm and phi 48 +/-0.5 mm respectively after molding.

According to the technical scheme provided by the embodiment of the application, the grounding shielding layer is a copper belt with the diameter of 40mm multiplied by 0.15mm, the copper belt is wound outside the second semiconductive PE layer, the number of winding layers is two, and the outer diameter of the grounding shielding layer after winding is phi 48.6 +/-0.5 mm.

According to the technical scheme provided by the embodiment of the application, the outer protection layer is made of polyvinyl chloride material, and the outer diameter is phi 53 +/-0.5 mm after molding.

In summary, the present technical solution specifically discloses a specific structure of a high voltage coaxial cable for 150kV electron beam welding equipment. The design of the application is provided with a conductor layer, wherein a first conductor, a first PE insulating layer, a second conductor, an inner shielding layer and a third conductor are sequentially sleeved on the conductor layer from inside to outside; two ends of the first conductor, the second conductor and the third conductor are respectively connected with a 150kV high-voltage power supply and an electron gun and are used for conducting electricity of the cable; the first PE insulating layer is used for electric isolation between the first conductor and the second conductor; the inner shielding layer is sequentially sleeved with a first semi-conductive layer, a second PE insulating layer and a second semi-conductive layer from inside to outside and used for eliminating air gaps on the surface of a conductor, homogenizing an electric field on the surface of the conductor, and inhibiting branch initiation and heat shielding; an outer shielding layer is sleeved outside the conductor layer and comprises a third semi-conducting layer, a first semi-conducting PE layer, a third PE insulating layer, a second semi-conducting PE layer and a grounding shielding layer, and the outer shielding layer is used for eliminating an air gap between the insulating layer and the outer metal shielding layer and shielding local discharge and electric branches; the first conductor, the second conductor and the third conductor are of a three-core structure which is coaxially sleeved, the electric conductivity of the three-core cable is guaranteed, and the problems that a high-voltage coaxial cable for 150kV electron beam welding equipment is high in cost, weak in anti-electromagnetic interference capacity and inconvenient to install are solved.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 is a schematic structural diagram of a high-voltage coaxial cable for 150kV electron beam welding equipment.

Reference numbers in the figures: 1. a first conductor; 2. a first PE insulating layer; 3. a second conductor; 4. a first semiconductor layer; 5. a second PE insulating layer; 6. a second semiconductive layer; 7. a third conductor; 8. A third semiconductive layer; 9. a first semi-conductive PE layer; 10. a third PE insulating layer; 11. a second semiconductive PE layer; 12. a ground shield layer; 13. and an outer protective layer.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example one

Referring to fig. 1, a schematic structural diagram of a first embodiment of a high-voltage coaxial cable for a 150kV electron beam welding device provided in the present application includes:

the conductive layer is sleeved with a first conductor 1, a first PE insulating layer 2, a second conductor 3, an inner shielding layer and a third conductor 7 from inside to outside in sequence;

the inner shielding layer is sequentially sleeved with a first semi-conductive layer 4, a second PE insulating layer 5 and a second semi-conductive layer 6 from inside to outside;

an outer shielding layer is sleeved outside the conductor layer and comprises a third semi-conductive layer 8, a first semi-conductive PE layer 9, a third PE insulating layer 10, a second semi-conductive PE layer 11 and a grounding shielding layer 12;

in this embodiment, a first conductor 1, a first PE insulating layer 2, a second conductor 3, an inner shield layer, and a third conductor 7 are sequentially sleeved on a conductor layer from inside to outside;

a first conductor 1, both ends of which are respectively connected with a 150kV high-voltage power supply and a filament, and are used for high-voltage output;

the first PE insulating layer 2 is used for electrically isolating the first conductor 1 from the second conductor 3, so that the first conductor 1 and the second conductor 3 are ensured not to interfere with each other;

the two ends of the second conductor 3 are respectively connected with a 150kV high-voltage power supply and a lamp filament and used for outputting the lamp filament;

the inner shielding layer has the functions of:

1. air gaps on the surfaces of the second conductor 3 and the third conductor 7 are eliminated, and the capacity of resisting partial discharge and branch discharge is improved;

2. the electric fields on the surfaces of the second conductor 3 and the third conductor 7 are uniform, the working field intensity on the surface of the conductor increased by the guide wire effect is reduced, and the electric field intensity on the surface of the conductor can be reduced by 20-30% by the inner shielding layer;

3. the initiation of tree branches is inhibited, when metal burrs on the surface of the conductor directly penetrate into the insulating layer, the field emission with high sharp field intensity can initiate electric tree branches, the inner shielding layer can effectively weaken the electric field intensity near the burrs, and the field emission is reduced, so that the characteristic of tree branch discharge resistance is improved;

4. the cable has the advantages that the cable has the thermal barrier function, when the temperature of the cable suddenly rises (the wire core generates heat), the inner shielding layer is isolated, the high temperature cannot impact the insulating layer immediately, the temperature rise of the insulating layer is reduced to a certain extent, and the main insulation is protected, so that the cable has the thermal barrier function;

a third conductor 7, both ends of which are respectively connected with a 150kV high-voltage power supply and a grid bias for grid bias output;

the inner shielding layer is sequentially sleeved with a first semi-conducting layer 4, a second PE insulating layer 5 and a second semi-conducting layer 6 from inside to outside;

the first semi-conductive layer 4 is equipotential with the shielded second conductor 3, has good contact with the second PE insulating layer 5, has a non-smooth surface of the second conductor 3, and is easy to form an air gap with the first semi-conductive layer 4 to cause partial discharge, and the first semi-conductive layer 4 is used for avoiding the partial discharge between the second conductor 3 and the second PE insulating layer 5;

a second PE insulating layer 5 for electrically isolating the first semiconducting layer 4 from the second semiconducting layer 6, ensuring that the first semiconducting layer 4 and the second semiconducting layer 6 do not interfere with each other;

a second semiconductive layer 6 which is equipotential to a shielded third conductor 7 and has good contact with the second PE insulating layer 5, a gap may exist on the surface of the second PE insulating layer 5 to cause partial discharge, and the second semiconductive layer 6 serves to shield the partial discharge between the second PE insulating layer 5 and the third conductor 7;

the outer shielding layer is sleeved outside the conductor layer and has the following functions:

1. shielding local discharge and electric tree branches, wherein when the cable is bent, the surface of an insulating layer of the cable is stretched under the action of tension, if local discharge exists, submicroscopic cracks are generated due to surface bending stress to cause the initiation of the electric tree branches, or the surface is corroded by the local discharge to cause new cracking to cause new tree branches, and the outer shielding layer can shield the local discharge and the electric tree branches;

2. no matter how perfect the processing technology of the metal shielding layer is, the bending deformation, the cold and hot effects and the like in the operation and construction of the metal shielding layer can generate an annular flat air gap between the metal shielding layer and the insulating layer, the deterioration effect of the annular flat air gap on an electric field is great, the air gap discharge and even insulation breakdown can be caused, and the air gap between the insulating layer and the outer metal shielding layer can be eliminated by the outer shielding layer;

the outer shielding layer comprises a third semiconductive layer 8, a first semiconductive PE layer 9, a third PE insulation layer 10, a second semiconductive PE layer 11 and a ground shield layer 12;

a third semi-conductive layer 8 which is equipotential with the shielded third conductor 7 and has good contact with the first PE layer 9, the third conductor 7 has a non-smooth surface and is liable to form an air gap with the first PE layer 9 to cause partial discharge, and the third semi-conductive layer 8 is used for preventing the partial discharge between the third conductor 7 and the first PE layer 9;

a first semiconductor PE layer 9 for shielding partial discharge between the third semiconductive layer 8 and the third PE insulation layer 10;

the third PE insulating layer 10 is used for electrical isolation between the first semiconductive PE layer 9 and the second semiconductive PE layer 11, and ensures that the first semiconductive PE layer 9 and the second semiconductive PE layer 11 do not interfere with each other;

a second semiconductive PE layer 11 for shielding partial discharge between the third PE insulating layer 10 and the ground shield layer 12;

a ground shield layer 12, which functions as:

1. the capacitor is used for passing capacitance current when the cable normally runs;

2. when the system is short-circuited, the short-circuit current is taken as a channel of the short-circuit current;

3. for shielding the electric field.

As shown in fig. 1, the outer protective layer 13, which is sleeved outside the outer shielding layer, protects the cable from mechanical damage and chemical corrosion, and increases the mechanical strength of the cable, i.e. plays a role in tensile, compressive and abrasion resistance.

As shown in FIG. 1, the first conductor 1 is of a type such as a solid bare copper wire having a diameter of 2.8. + -. 0.05mm, which has excellent conductivity.

As shown in FIG. 1, the second conductor 3 is made of, for example, a bare copper wire with a diameter of 0.3mm, and is tightly woven into a double-layer mesh structure with an outer diameter of 6.5 mm + -0.2 mm after weaving.

As shown in FIG. 1, the third conductor 7 is made of, for example, a bare copper wire with a diameter of 0.25mm, and is tightly woven into a double-layer net structure with an outer diameter of 13.1 + -0.3 mm after weaving.

As shown in FIG. 1, the first PE insulation layer 2, the second PE insulation layer 5 and the third PE insulation layer 10 are made of, for example, cross-linked polyethylene, and have outer diameters of φ 5.2 + -0.2 mm, φ 11.6 + -0.3 mm and φ 45 + -0.5 mm after molding.

As shown in FIG. 1, the first semiconductive layer 4, the second semiconductive layer 6 and the third semiconductive layer 8 are, for example, nylon tapes, which are impregnated and wound with a semiconductive adhesive and have outer diameters of 6.9. + -. 0.2mm, 12. + -. 0.3mm and 13.5. + -. 0.3mm, respectively.

As shown in FIG. 1, the first semiconductive PE layer 9 and the second semiconductive PE layer 11 are made of, for example, crosslinked polyethylene, and ethylene propylene diene monomer rubber and conductive carbon black are added and mixed, and the outer diameters are respectively phi 15 + -0.3 mm and phi 48 + -0.5 mm after molding.

As shown in fig. 1, the ground shield 12 is of a type such as 40mm x 0.15mm copper tape, which is wound around the second semi-conductive PE layer 11 in two layers, and the outer diameter of the ground shield 12 after winding is phi 48.6 ± 0.5mm.

As shown in fig. 1, the outer protection layer 13 is made of, for example, a polyvinyl chloride material, and has an outer diameter of 53 ± 0.5mm after being formed, and the polyvinyl chloride material has excellent mechanical properties and electrical properties, strong acid and alkali resistance, and good chemical stability.

The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention according to the present application is not limited to the specific combination of the above-mentioned features, but also covers other embodiments where any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (10)

1. A high voltage coaxial cable for 150kV electron beam welding equipment, comprising: the conductive layer is sleeved with a first conductor (1), a first PE insulating layer (2), a second conductor (3), an inner shielding layer and a third conductor (7) from inside to outside in sequence;

the inner shielding layer is sequentially sleeved with a first semi-conductive layer (4), a second PE insulating layer (5) and a second semi-conductive layer (6) from inside to outside;

the conducting layer overcoat is equipped with outer shielding layer, outer shielding layer includes third semiconductive layer (8), first semiconductive PE layer (9), third PE insulating layer (10), second semiconductive PE layer (11) and ground shield layer (12).

2. The high-voltage coaxial cable for 150kV electron beam welding equipment according to claim 1, wherein: the outer shielding layer is sleeved with an outer protective layer (13).

3. The high-voltage coaxial cable for 150kV electron beam welding equipment according to claim 1, wherein: the first conductor (1) is a solid bare copper wire with the diameter of 2.8 +/-0.05 mm.

4. The high-voltage coaxial cable for 150kV electron beam welding equipment according to claim 1, wherein: the second conductor (3) is made of a bare copper wire with the diameter of 0.3mm, the bare copper wire is tightly woven into a double-layer net structure, and the outer diameter of the woven bare copper wire is 6.5 +/-0.2 mm.

5. The high-voltage coaxial cable for 150kV electron beam welding equipment according to claim 1, wherein: the third conductor (7) is made of a bare copper wire with the diameter of 0.25mm, the bare copper wire is tightly woven into a double-layer net structure, and the outer diameter of the braided bare copper wire is 13.1 +/-0.3 mm.

6. The high-voltage coaxial cable for 150kV electron beam welding equipment according to claim 1, wherein: the first PE insulating layer (2), the second PE insulating layer (5) and the third PE insulating layer (10) are all made of cross-linked polyethylene materials, and the outer diameters of the cross-linked polyethylene materials after molding are respectively phi 5.2 +/-0.2 mm, phi 11.6 +/-0.3 mm and phi 45 +/-0.5 mm.

7. The high-voltage coaxial cable for 150kV electron beam welding equipment according to claim 1, wherein: the first semi-conductive layer (4), the second semi-conductive layer (6) and the third semi-conductive layer (8) are all formed by impregnating and winding nylon tapes through semi-conductive glue, and the outer diameters of the wound nylon tapes are phi 6.9 +/-0.2 mm, phi 12 +/-0.3 mm and phi 13.5 +/-0.3 mm respectively.

8. The high-voltage coaxial cable for 150kV electron beam welding equipment according to claim 1, wherein: the outer diameters of the first semi-conductive PE layer (9) and the second semi-conductive PE layer (11) after molding are respectively phi 15 +/-0.3 mm and phi 48 +/-0.5 mm.

9. The high-voltage coaxial cable for 150kV electron beam welding equipment according to claim 1, wherein: the grounding shielding layer (12) is a 40mm multiplied by 0.15mm copper strip which is wound outside the second semi-conductive PE layer (11), the number of winding layers is two, and the outer diameter of the grounding shielding layer (12) after winding is phi 48.6 +/-0.5 mm.

10. The high-voltage coaxial cable for 150kV electron beam welding equipment according to claim 2, wherein: the outer protection layer (13) is made of polyvinyl chloride material, and the outer diameter is phi 53 +/-0.5 mm after molding.

Images