CN114496430A - Surface crack accurate repairing device and method based on plasma jet - Google Patents
Surface crack accurate repairing device and method based on plasma jet Download PDFInfo
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- CN114496430A CN114496430A CN202210135003.0A CN202210135003A CN114496430A CN 114496430 A CN114496430 A CN 114496430A CN 202210135003 A CN202210135003 A CN 202210135003A CN 114496430 A CN114496430 A CN 114496430A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/04—Treating the surfaces, e.g. applying coatings
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- H—ELECTRICITY
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- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
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- H—ELECTRICITY
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- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
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Abstract
The invention provides a plasma jet-based surface crack accurate repairing device and method, wherein gas in a gas bottle is divided into three paths through a pipeline, each path is provided with a flowmeter, a flowmeter A and a medium A gas washing bottle are connected in series, a flowmeter B and a medium B gas washing bottle are connected in series, the three paths of gas enter a gas mixing box, the outlet of the gas mixing box is connected with the inlet of a jet flow reactor, the jet flow reactor discharges under the action of a plasma excitation source to generate a plasma plume, the plasma plume is used for repairing cracks on the surface of a fixed medium, the medium A is methoxysilane, and the medium B is deionized water. The invention is based on the atmospheric pressure plasma jet technology, solves the problems of poor stability of interference coating, physical coating and chemical repairing agents on the surface of the material in the process of repairing cracks on the surface of the solid insulation, realizes accurate repair and chemical healing of surface damage of the insulation material, prolongs the service life of the solid insulation medium, and improves the operation reliability of the solid insulation medium.
Description
Technical Field
The invention relates to an accurate repair method for cracks on the surface of a solid medium, in particular to an accurate repair method for cracks on the surface of a solid medium based on atmospheric pressure plasma jet.
Background
The outdoor insulation solid medium is used as a potential isolation and mechanical support key material, and is easily influenced by corona discharge, surface flashover, mechanical stress and the like under a long-term service condition, a macromolecular chain of the outdoor insulation solid medium is broken or over-crosslinked, and the surface of the outdoor insulation solid medium inevitably has aging phenomena such as hardening, pulverization, scratch and the like, so that the electric field distribution of the insulation surface is changed to become potential sites of impurities such as water drops, dirt and the like, the insulation reliability is reduced, and the safe and reliable operation of a power system is seriously influenced.
For the defects of cracks on the insulation surface, the damage on the insulation surface is generally repaired by an insulation surface coating technology, such as silicone oil silicone grease coating, ozokerite engine oil coating and widely-used room temperature vulcanized silicone rubber RTV. However, due to the mutual independence of the coating and the insulating substrate in the molecular structure and the complexity of the multi-step coating process, the conventional surface coating method only completes the shielding of the insulating surface defects from a macroscopic scale, which causes the physical repair means of simple coating to be ' temporary solution ' and permanent solution '; and the large-area interference coating method adopted aiming at the local defects of the insulating surface introduces a macroscopic interface, generates the electric field distortion of the insulating surface and causes the potential risk that the insulator is failed again.
In recent years, scholars realize the repair of the internal crack defect of the insulating body by a microcapsule coating repair agent and a siloxane injection filling technology and by utilizing the targeted chemical reaction of a special reinforcing phase, namely a repair phase. The technology for repairing the internal defects of the insulation body through the targeted chemical reaction provides a thought for an insulation surface damage repairing technology, but the technology is difficult to be directly applied to crack repairing of an outdoor insulation surface. On one hand, the chemical reaction of the body doping type self-repairing material needs harsh reaction conditions, and the curing and repairing time reaches several hours; on the other hand, the typical 'swelling' phenomenon can occur when the high-molecular silicon rubber material is directly contacted with the organic repairing agent, and the electrical insulation performance of the material is damaged. There is a need for a chemical repair method that considers the microscopic reaction between the repair agent and the material surface and reliably grafts the bonds, so as to achieve precise and rapid repair of the elongated and distributed cracks on the insulating surface.
For the material modification apparatus, there are patents disclosing related proposals. A method for repairing cracks on a solid insulation surface and a repairing device CN202110144983.6 thereof realize the repair of the cracks on the insulation surface by utilizing microwave plasma jet, but the position of a jet reactor is fixed, so distributed cracks cannot be treated, a single precursor methyl siloxane or an alumina solution does not have self-polymerization reaction, and the method only belongs to plasma spraying repair and cannot ensure effective chemical repair.
A method for repairing integrated circuit CN202010898353.3 adopts focused ion beam FIB process to repair the metal interconnection structure in the target area, but the method belongs to etching process, removes the storage array layer on the target area, and does not repair and fill the defect.
The related scheme is disclosed in the patent, which is applied to the plasma repair in other fields. A method for remedying the organic contaminated soil by the soil drenching discharge plasma and a device CN201910306533.5 are contacted with active substances generated by the discharge plasma and carry out a biochemical reaction, so that organic pollutants in the soil are degraded or mineralized, the toxicity level of the contaminated soil is reduced, but the method cannot realize the remediation of cracks of solid medium materials.
Disclosure of Invention
1. The technical problem to be solved is as follows:
the conventional coating technology is subjected to interference treatment, the coating needs to be cured, the treatment efficiency is low, and the operation and maintenance time is long; the chemical repairing method cannot be directly applied to surface crack repairing of the solid insulating medium due to the fact that the repairing agent has high requirements on the environment; aiming at the distributed irregular cracks, an accurate repairing device is lacked; in the prior art, the selected reaction medium or precursor only realizes crack filling, and does not meet the requirements on three-dimensional repair and filling of crack gaps.
2. The technical scheme is as follows:
in order to solve the problems, the invention provides a plasma jet-based surface crack accurate repairing device which comprises a gas bottle and a jet flow reactor, wherein gas in the gas bottle is divided into three paths through a pipeline, each path is provided with a flowmeter which is respectively a flowmeter A, a flowmeter B and a flowmeter C, the flowmeter A is connected with a medium A gas washing bottle in series, the flowmeter B is connected with the medium B gas washing bottle in series, the three paths of gas enter a gas mixing box, the outlet of the gas mixing box is connected with the inlet of the jet flow reactor, the jet flow reactor discharges under the action of a plasma excitation source to generate a plasma plume, the plasma plume is used for repairing fixed medium surface cracks, the medium A is methoxysilane, and the medium B is deionized water.
The gas cylinder divides the output gas into two parts through a plastic three-way joint A, one part of the gas flows to a flowmeter A, the medium A in a gas washing cylinder with the medium A is taken out and enters a gas mixing box, the other part of the gas flows to a flowmeter B through a plastic three-way joint B, the medium B in the gas washing cylinder with the medium B is taken out and enters the gas mixing box, the other part of the gas flows to a flowmeter C, and the flowmeter C is directly connected with the gas mixing box.
The jet flow reactor is characterized by further comprising a mechanical arm, wherein the mechanical arm is connected with the jet flow reactor and drives the jet flow reactor to move.
Controlling the mass ratio of the reaction medium A to the medium B to be blown into the gas mixing box to be 8: 1-10: 1.
The flow meter C controls the flow rate of the reaction gas, wherein the reaction gas is Ar gas, and the flow rate of the gas is between 0.8 and 1.2L/min.
The gas is carried out of the medium A in the medium A gas washing bottle and the medium B in the medium B gas washing bottle by a bubbling method and enters the gas mixing box.
The jet flow reactor is fixed on the mechanical arm through an annular polytetrafluoroethylene sleeve.
The invention also provides a method for repairing the surface crack accurate repairing device based on the plasma jet, which comprises the following steps: the method comprises the steps of placing a solid insulating medium to be repaired below a jet flow reactor, opening a pressure reducing valve, enabling gas to pass through a flowmeter A on one way, driving a medium A to enter a gas mixing box, enabling gas to pass through a flowmeter B on the other way, driving a medium B to enter the gas mixing box, enabling gas to pass through a flowmeter C on the other way, enabling the medium A, the medium B and reaction gas to be fully mixed in the gas mixing box, enabling the gas to pass through the jet flow reactor, enabling the medium A, the medium B and the reaction gas to be discharged under the action of a plasma excitation source, generating plasma plumes to be aligned with cracks, and achieving accurate repairing of the cracks through movement of a mechanical arm.
The cracks are irregularly shaped.
3. Has the advantages that:
the invention is based on the atmospheric pressure plasma jet technology, solves the problems of poor stability of interference coating, physical coating and chemical repairing agents on the surface of the material in the process of repairing cracks on the surface of the solid insulation, realizes accurate repair and chemical healing of surface damage of the insulation material, prolongs the service life of the solid insulation medium and improves the operation reliability of the solid insulation medium.
Drawings
FIG. 1 is a plasma jet apparatus for accurately repairing cracks on an insulating surface.
FIG. 2 is a comparison of before and after plasma repair.
A description of the reference numerals; the device comprises a gas cylinder 1, a pressure reducing valve 2, a flow meter A3, a flow meter B4, a flow meter C5, a medium A gas washing cylinder 6, a medium B gas washing cylinder 7, a gas mixing box 8, a jet flow reactor 9, an annular polytetrafluoroethylene sleeve 10, a mechanical arm 11, a plasma excitation source 12, a solid insulating medium 13, a pipeline 14, a plastic tee joint A15, a plastic tee joint B16, a plasma plume 17 and cracks 18.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
As shown in FIG. 1, the surface crack accurate repairing device based on plasma jet flow is characterized in that gas in a gas cylinder 1 is divided into three paths through a pipeline 14, each path is provided with a flow meter, namely a flow meter A3, a flow meter B4 and a flow meter C5, wherein the flow meter A3 is connected with a medium A gas washing cylinder 6 in series, the flow meter B4 is connected with a medium B gas washing cylinder 7 in series, the three paths of gas all enter a gas mixing box 8, an outlet of the gas mixing box 8 is connected with an inlet of a jet flow reactor 9, and a medium and reaction gas in the gas mixing box 8 are fully mixed and flow into the jet flow reactor 9.
The jet reactor 9 discharges under the action of a plasma excitation source 12 to generate a plasma plume 17, the plasma plume 17 is used for repairing cracks on the surface of a fixed medium, a medium A is methoxy silane, and a medium B is deionized water.
In one embodiment, the gas is divided into three paths in a specific manner: the plastic three-way joint A15 divides the gas output by the gas bottle 1 into two parts, one part of the gas is led to the flowmeter A3, and the medium A in the medium A gas washing bottle 6 is brought out by a bubbling method and enters the gas mixing box 8; the other path leads to a plastic tee joint B16 which is split into two parts and then leads to a flowmeter B4 and a flowmeter C5 respectively.
The flowmeter B4 is connected with a medium B gas washing bottle B7, and the gas in the loop carries the medium B out into the gas mixing box 8 by a bubbling method; the flow meter C5 is connected directly to the mixing box 8.
In one embodiment, the device further comprises a mechanical arm 11, one end of the mechanical arm is fixed on the jet reactor 9, and the mechanical arm moves to realize accurate repair of the irregular cracks. The jet reactor 9 is fixed on the mechanical arm 11 through an annular polytetrafluoroethylene sleeve 10, so that the insulating property between a high-voltage lead and a mechanical arm metal structure is ensured.
For better repairing effect, the mass ratio of the reaction medium A and the medium B blown into the gas mixing box 8 is controlled to be 8: 1-10: 1.
The flow meter C5 controls the flow rate of the reaction gas, the reaction gas is Ar gas, and the gas flow rate is 0.8-1.2L/min.
When the plasma jet flow acts on the surface of the insulating material, the surface of the material is oxidized, and oxygen-containing polar functional groups are introduced into molecular chains to activate the surface of the insulating material. In the case of silicone rubber insulation, the branches of the siloxane molecular skeleton generally have methyl-CH groups3Or vinyl-CH = CH2Under the action of plasma, the chemical bond of the branch chain is opened, and oxygen-containing hydroxyl group-OH is introduced, as shown in formula 1 and formula 2:
meanwhile, the reaction medium A and the reaction medium B are accelerated to form an external-aid reinforcing phase at the crack of the insulating surface under the action of plasma, wherein the external-aid reinforcing phase comprises-OCH3The hydrolysis reaction between the methoxy silane of the group and water is accelerated under the action of plasma to form silanol, as shown in a formula 3, whereinAnd ph is a phenyl group, and the phenyl group,
the silanol enables condensation reaction between the silanol and the silanol to form siloxane oligomer due to the existence of high-activity Si-OH groups, and the siloxane oligomer is shown in a formula 4:
hydroxyl at the chain end of the siloxane oligomer and hydroxyl on the crack surface of the insulating material are mutually adsorbed to form a hydrogen bond, and then the siloxane oligomer and the insulating material form a covalent bond through graft copolymerization. Meanwhile, the silanol and the silanol are crosslinked and cured to form a three-dimensional network structure so as to realize the repair of the cracks, as shown in formula 5:
the invention also provides a method for repairing the surface crack accurate repairing device based on the plasma jet, which comprises the following steps: the method comprises the steps of placing 13 a solid insulating medium to be repaired below a jet flow reactor 9, opening a pressure reducing valve 2, enabling gas to pass through a flowmeter A3 on one hand, driving a medium A to enter a gas mixing box 8, enabling gas to pass through a flowmeter B4 on the other hand, driving a medium B to enter the gas mixing box 8, enabling gas to pass through a flowmeter C5 on the other hand, enabling the medium A, the medium B and reaction gas in the gas mixing box 8 to be fully mixed, enabling the medium A, the medium B and the reaction gas to pass through the jet flow reactor 9, enabling the medium B to be discharged under the action of a plasma excitation source 12, generating a plasma plume 17 to be aligned with a crack 18, and achieving accurate repair of the crack through movement of a mechanical arm 11.
Because the robotic arm can move in multiple directions, the crack 18 can still be repaired accurately when the crack is irregularly shaped.
FIG. 2 is a comparison chart before and after repair, wherein before and after repair is shown in the left and right sides of FIG. 2, after repair is shown in the right side of FIG. 2, and it can be seen from the figure that the cracks on the surface of the solid medium are completely repaired after repair.
Claims (9)
1. A surface crack accurate repairing device based on plasma jet comprises a gas bottle (1) and a jet reactor (9), and is characterized in that: the gas of the gas bottle (1) is divided into three paths through a pipeline (14), each path is provided with a flowmeter which is respectively a flowmeter A (3), a flowmeter B (4) and a flowmeter C (5), wherein the flowmeter A (3) is connected with a medium A gas washing bottle (6) in series, the flowmeter B (4) is connected with a medium B gas washing bottle (7) in series, the three paths of gas enter a gas mixing box (8), the outlet of the gas mixing box (8) is connected with the inlet of a jet flow reactor (9), the jet flow reactor (9) discharges under the action of a plasma excitation source (12) to generate a plasma plume (17), the plasma plume (17) is used for repairing the surface crack of a fixed medium, the medium A is methoxysilane, and the medium B is deionized water.
2. The plasma-jet-based surface crack precision repairing device according to claim 1, wherein: the gas cylinder (1) divides output gas into two parts through a plastic three-way joint A (15), one part of the output gas flows to a flowmeter A (3), a medium A in a medium A gas washing cylinder (6) is taken out to enter a gas mixing box (8), the other part of the output gas is divided into two parts through a plastic three-way joint B (16), one part of the output gas flows to a flowmeter B (4), a medium B in a medium B gas washing cylinder (7) is taken out to enter the gas mixing box (8), the other part of the output gas is connected with a flowmeter C (5), and the flowmeter C (5) is directly connected with the gas mixing box.
3. The plasma-jet-based surface crack precision repairing device according to claim 1, wherein: the device also comprises a mechanical arm (11), wherein the mechanical arm (11) is connected with the jet reactor (9) and drives the jet reactor (9) to move.
4. The plasma-jet-based surface crack precision repairing device according to any one of claims 1 to 3, characterized in that: the mass ratio of the reaction medium A and the medium B blown into the gas mixing box (8) is controlled to be 8: 1-10: 1.
5. The plasma-jet-based surface crack precision repairing apparatus as claimed in any one of claims 1 to 3, wherein: the flow meter C (5) controls the flow rate of the reaction gas, the reaction gas is Ar gas, and the gas flow rate is 0.8-1.2L/min.
6. The plasma-jet-based surface crack precision repairing device according to any one of claims 1 to 3, characterized in that: the gas is carried out from the medium A in the medium A gas washing bottle (6) and the medium B in the medium B gas washing bottle (7) by a bubbling method and enters a gas mixing box (8).
7. The plasma-jet-based surface crack precision repairing device according to claims 1-3, characterized in that: the jet reactor (9) is fixed on a mechanical arm (11) through an annular polytetrafluoroethylene sleeve (10).
8. The method for repairing the plasma jet based surface crack precision repairing device of any one of claims 1-7, comprising the following steps: the method comprises the steps of placing (13) a solid insulating medium to be repaired below a jet flow reactor (9), opening a pressure reducing valve (2), enabling gas to pass through a flowmeter A (3) on one way and drive a medium A to enter a gas mixing box (8), enabling gas to pass through a flowmeter B (4) on one way and drive a medium B to enter the gas mixing box (8), enabling gas to pass through a flowmeter C (5) on one way and enter the gas mixing box (8), enabling the medium A, the medium B and reaction gas to be fully mixed in the gas mixing box (8), enabling the medium A, the medium B and the reaction gas to pass through the jet flow reactor (9), enabling the medium B to be discharged under the action of a plasma excitation source (12), generating plasma plumes (17) to be aligned with cracks (18), and achieving accurate repairing of the cracks through movement of a mechanical arm.
9. The method of claim 8, wherein: the cracks (18) are irregularly shaped.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006210774A (en) * | 2005-01-31 | 2006-08-10 | Taiyo Nippon Sanso Corp | Method of restoring film with low dielectric constant from damages |
| CN110493946A (en) * | 2019-09-23 | 2019-11-22 | 大连理工大学 | A kind of device that large area jet stream discharge plasma resin sorbent surface is modified |
| CN110853848A (en) * | 2019-11-18 | 2020-02-28 | 天津大学 | Treatment method for improving insulator flashover voltage by atmospheric pressure plasma jet method |
| CN112951527A (en) * | 2021-02-02 | 2021-06-11 | 中国科学院电工研究所 | Solid insulation surface crack repairing method and repairing device thereof |
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- 2022-02-14 CN CN202210135003.0A patent/CN114496430B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006210774A (en) * | 2005-01-31 | 2006-08-10 | Taiyo Nippon Sanso Corp | Method of restoring film with low dielectric constant from damages |
| CN110493946A (en) * | 2019-09-23 | 2019-11-22 | 大连理工大学 | A kind of device that large area jet stream discharge plasma resin sorbent surface is modified |
| CN110853848A (en) * | 2019-11-18 | 2020-02-28 | 天津大学 | Treatment method for improving insulator flashover voltage by atmospheric pressure plasma jet method |
| CN112951527A (en) * | 2021-02-02 | 2021-06-11 | 中国科学院电工研究所 | Solid insulation surface crack repairing method and repairing device thereof |
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