CN117476297A - Manufacturing method of corrosion-resistant heating flexible cable and corrosion-resistant heating flexible cable - Google Patents
Manufacturing method of corrosion-resistant heating flexible cable and corrosion-resistant heating flexible cable Download PDFInfo
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- CN117476297A CN117476297A CN202311645846.6A CN202311645846A CN117476297A CN 117476297 A CN117476297 A CN 117476297A CN 202311645846 A CN202311645846 A CN 202311645846A CN 117476297 A CN117476297 A CN 117476297A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 58
- 230000007797 corrosion Effects 0.000 title claims abstract description 49
- 238000005260 corrosion Methods 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 259
- 239000011707 mineral Substances 0.000 claims abstract description 259
- 238000009413 insulation Methods 0.000 claims abstract description 123
- 229910052751 metal Inorganic materials 0.000 claims abstract description 85
- 239000002184 metal Substances 0.000 claims abstract description 85
- 239000004020 conductor Substances 0.000 claims abstract description 53
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 12
- 238000004049 embossing Methods 0.000 claims description 27
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 25
- 239000008397 galvanized steel Substances 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 14
- 238000000137 annealing Methods 0.000 claims description 5
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- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
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- 238000000034 method Methods 0.000 description 25
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- 239000000395 magnesium oxide Substances 0.000 description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 11
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 239000003921 oil Substances 0.000 description 10
- 239000003208 petroleum Substances 0.000 description 10
- 230000000750 progressive effect Effects 0.000 description 8
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 7
- 238000005253 cladding Methods 0.000 description 7
- 239000011737 fluorine Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- RJDOZRNNYVAULJ-UHFFFAOYSA-L [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Mg++].[Mg++].[Mg++].[Al+3].[Si+4].[Si+4].[Si+4].[K+] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Mg++].[Mg++].[Mg++].[Al+3].[Si+4].[Si+4].[Si+4].[K+] RJDOZRNNYVAULJ-UHFFFAOYSA-L 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 5
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 5
- 229910001950 potassium oxide Inorganic materials 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
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- 229910052748 manganese Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000010445 mica Substances 0.000 description 3
- 229910052618 mica group Inorganic materials 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- NGONBPOYDYSZDR-UHFFFAOYSA-N [Ar].[W] Chemical compound [Ar].[W] NGONBPOYDYSZDR-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
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- 239000003129 oil well Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
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- 239000010703 silicon Substances 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
- H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/10—Insulating conductors or cables by longitudinal lapping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0225—Three or more layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/186—Sheaths comprising longitudinal lapped non-metallic layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/22—Metal wires or tapes, e.g. made of steel
- H01B7/221—Longitudinally placed metal wires or tapes
- H01B7/225—Longitudinally placed metal wires or tapes forming part of an outer sheath
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/2806—Protection against damage caused by corrosion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
Abstract
The application provides a manufacturing method of a corrosion-resistant heating flexible cable, the corrosion-resistant heating flexible cable and a corrosion-resistant heating cableThe manufacturing method of the thermal flexible cable comprises the following steps: providing a single strand conductor; wrapping an inner mineral insulating layer around the periphery of the single conductor; an intermediate mineral insulating layer having a resistivity of 1×l0 is wrapped around the outer periphery of the inner mineral insulating layer 14 Ω.cm～1×l0 15 Omega. Cm, the intermediate mineral insulation layer comprises the following components: siO (SiO) 2 :36 to 38%, al 2 O 3 :11 to 14%, fe 2 O 3 :1 to 2%, mgO:28 to 30%, K 2 O:10 to 12%, F:8 to 9%; wrapping an outer mineral insulating layer around the outer periphery of the middle mineral insulating layer, wherein the resistivity of the outer mineral insulating layer and the inner mineral insulating layer is 1×l0 8 Ω.cm～1×l0 9 Omega cm; and the periphery of the outer mineral insulating layer is coated with a magnetic metal sheath.
Description
Technical Field
The application relates to the technical field of cable manufacturing, in particular to a manufacturing method of a corrosion-resistant heating flexible cable and the corrosion-resistant heating flexible cable.
Background
In the oil exploitation process, the consistency and viscosity of oil in an oil well are high, the fluidity is poor, and the oil pumping efficiency of the oil is greatly affected. The oil is typically heated to increase its mobility prior to pumping. At present, most of heating methods are to heat petroleum by supplying water vapor into the petroleum, and the cost of the heating method is too high, and the water vapor needs to be pressurized when the temperature is raised, so that the explosion risk exists.
Disclosure of Invention
The application provides a manufacturing method of a corrosion-resistant heating flexible cable and the corrosion-resistant heating flexible cable, so as to solve the problems of high cost and potential safety hazard in the petroleum exploitation process in the prior art.
In a first aspect, the present application provides a method for manufacturing a corrosion-resistant heating flexible cable, including the steps of: providing a single strand conductor; wrapping an inner mineral insulating layer around the outer periphery of the single conductor, the inner mineral insulating layer having a resistivity of 1×l0 8 Ω.cm～1×l0 9 Ω.cm；
Wrapping an intermediate mineral insulating layer around the outer periphery of the inner mineral insulating layer, the intermediate mineral insulating layer having a resistivity of 1×l0 14 Ω.cm～1×l0 15 Omega cm, the intermediate mineral insulation layer comprises the following components: siO (SiO) 2 :36 to 38%, al 2 O 3 :11 to 14%, fe 2 O 3 :1 to 2%, mgO:28 to 30%, K 2 O:10 to 12%, F:8 to 9%;
wrapping an outer mineral insulating layer around the outer periphery of the intermediate mineral insulating layer, the outer mineral insulating layer and the inner mineral insulating layer having a resistivity of 1×l0 8 Ω.cm～1×l0 9 Ω.cm；
And a magnetic metal sheath is coated on the periphery of the outer mineral insulating layer.
In one possible implementation manner, the inner mineral insulation layer includes a first mineral insulation layer and a second mineral insulation layer, the first mineral insulation layer is wrapped around the periphery of the single-strand conductor, two adjacent circles of side edges of the first mineral insulation layer are spliced, and the second mineral insulation layer is wrapped around the periphery of the first mineral insulation layer and is wrapped around the splice of the first mineral insulation layer during wrapping.
In one possible embodiment, the intermediate mineral insulation layer comprises a first intermediate mineral insulation layer and a second intermediate mineral insulation layer, the first intermediate mineral insulation layer is wrapped around the periphery of the second mineral insulation layer and covers the splice of the second mineral insulation layer when wrapped;
the second middle mineral insulating layer is wrapped on the periphery of the first middle mineral insulating layer and coats the spliced part of the first middle mineral insulating layer during wrapping.
In one possible embodiment, the outer mineral insulation layer comprises a third mineral insulation layer and a fourth mineral insulation layer, wherein the third mineral insulation layer is wrapped on the periphery of the second intermediate mineral insulation layer and wraps the splice of the second intermediate mineral insulation layer when wrapped;
the fourth mineral insulating layer is wrapped on the periphery of the third mineral insulating layer and coats the spliced part of the third mineral insulating layer during wrapping.
In one possible embodiment, the magnetic metal sheath is wrapped on the periphery of the outer mineral insulation layer in a longitudinal wrapping manner, and the method comprises the following steps:
providing a steel belt and a plurality of dies, and galvanizing one side surface of the steel belt;
coating the galvanized steel strip on the periphery of the outer mineral insulating layer after being bent for a plurality of times by a plurality of dies to form the magnetic metal sheath, and forming a gap between the magnetic metal sheath and the periphery of the outer mineral insulating layer;
welding the magnetic metal sheath to the periphery of the outer mineral insulating layer and sealing the magnetic metal sheath;
the magnetic metal sheath is embossed to form spiral waves on the periphery of the magnetic metal sheath.
In one possible embodiment, the corrugations of the magnetic metal sheath bear against the outer mineral insulating layer.
In one possible embodiment, the steel strip comprises 1.2% C by mass, 0.1% Si by mass, 0.8% Mn by mass, and 0.1% P by mass.
In one possible embodiment, the preparation of the single strand conductor comprises the steps of:
drawing the metal rod to form a monofilament;
annealing the filaments at a temperature of 580 ℃ to 600 ℃;
and twisting the multiple strands of monofilaments in the same direction.
In a second aspect, an embodiment of the present application further provides a corrosion-resistant heating flexible cable, which is manufactured by adopting the manufacturing method of the corrosion-resistant heating flexible cable, and the corrosion-resistant heating flexible cable includes a conductor, an inner mineral insulating layer, an intermediate mineral insulating layer, an outer mineral insulating layer, and a magnetic metal sheath, where the conductor is single-stranded, the inner mineral insulating layer, the intermediate mineral insulating layer, and the outer mineral insulating layer are sequentially wrapped around the periphery of the conductor, and the magnetic metal sheath Bao Sheyu is around the periphery of the outer mineral insulating layer.
In one possible implementation manner, the outer circumferential surface of the magnetic metal sheath is concavely provided with embossing grooves, the inner circumferential surface of the magnetic metal sheath is convexly provided with embossing protrusions, the embossing protrusions are correspondingly arranged with the embossing grooves, and the embossing protrusions are propped against the outer circumferential surface of the outer mineral insulating layer.
According to the manufacturing method of the corrosion-resistant heating flexible cable, the magnetic metal sheath is arranged outside the conductor, and eddy current can be generated between the conductor and the magnetic metal sheath when current passes through the conductor, so that the magnetic metal sheath heats, and petroleum is heated. Meanwhile, an inner mineral insulating layer, an intermediate mineral insulating layer and an outer mineral insulating layer are arranged between the conductor and the magnetic metal sheath, the intermediate mineral insulating layer has higher high temperature resistance and resistivity, the problems of aging, fragmentation and the like can not occur in a working environment of 350 ℃ for a long time, the service life of the cable is prolonged, the inner mineral insulating layer and the outer mineral insulating layer can not only avoid the direct contact of the intermediate mineral insulating layer with the conductor to cause electric field concentration, but also homogenize an electric field and play a buffering role on pulse voltage during frequency modulation, the intermediate mineral insulating layer is ensured not to be broken down, and the service life of the cable is further prolonged.
Drawings
Fig. 1 is a schematic flow chart of a manufacturing method of the corrosion-resistant heating flexible cable according to an embodiment of the present application.
Fig. 2 is a schematic flow chart of a method for manufacturing a corrosion-resistant heating flexible cable according to an embodiment of the present disclosure.
Fig. 3 is a schematic flow chart of a processing method of a magnetic metal sheath in an embodiment of a method for manufacturing a corrosion-resistant heating flexible cable according to the present application.
Fig. 4 is a schematic structural view of a corrosion-resistant heating flexible cable according to an embodiment of the present application.
Fig. 5 is a schematic structural view of the magnetic metal sheath of the corrosion resistant heating flexible cable of fig. 4 in an embodiment.
Description of main reference numerals:
manufacturing method 100 of corrosion-resistant heating flexible cable
Corrosion-resistant heating flexible cable 200
Conductor 10
Inner mineral insulation layer 20
First mineral insulation layer 21
Second mineral insulation layer 22
Intermediate mineral insulation layer 30
First intermediate mineral insulation layer 31
Second intermediate mineral insulating layer 32
Outer mineral insulation 40
Third mineral insulation layer 41
Fourth mineral insulation layer 42
Magnetic metal sheath 50
Embossing protuberance 51
Embossing groove 52
The following detailed description will further illustrate the application in conjunction with the above-described figures.
Detailed Description
The following description will refer to the accompanying drawings in order to more fully describe the present application. Exemplary embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. Like reference numerals designate identical or similar components.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, as used herein, "comprises" and/or "comprising" and/or "having," integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, and/or groups thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Furthermore, unless the context clearly defines otherwise, terms such as those defined in a general dictionary should be construed to have meanings consistent with their meanings in the relevant art and the present application, and should not be construed as idealized or overly formal meanings.
The following detailed description of specific embodiments of the present application refers to the accompanying drawings.
As shown in fig. 1 to 4, the present embodiment provides a method 100 for manufacturing a corrosion-resistant heating flexible cable, which includes the following steps:
s1, providing a single conductor 10.
The conductor 10 is of a single-core structure and is matched with the magnetic metal sheath 50 at the outermost periphery of the cable, when current flows through the conductor 10 of the single-core structure, the heating efficiency of the magnetic metal sheath 50 can be improved, and the maximum heating temperature of the manufactured cable is 350 ℃ and is far higher than the maximum heating temperature of the existing heating cable by 250 ℃. The heating temperature of the magnetic metal sheath 50 of the present application is higher at the same input power than the conductor 10 adopting the multi-core structure. This is because the directions of electromagnetic fields generated by the respective conductors in the cable using the multi-core structure are different from each other, and the electromagnetic fields generated by the respective conductors at least partially cancel each other out, resulting in a reduction in the amount of heat generated when the respective conductors of the multi-core structure interact with the magnetic metal sheath. For example, a cable employing a three-core structure has three conductors arranged in a triangle shape, resulting in a large amount of cancellation of the electromagnetic field, and cancellation of the eddy currents formed to near zero.
In one embodiment, the preparation of the single strand conductor 10 includes the steps of:
s11, drawing the metal rod to form a monofilament.
Further, the metal rod is made of copper and has a diameter of 1.2mm. And (3) drawing the metal rod through a drawing die with gradually changed aperture in a small drawing machine to obtain the monofilament with the diameter of 0.16-0.4 mm.
S12, annealing the monofilaments at a temperature of 580-600 ℃.
Further, the monofilaments are pulled into an annealing furnace, the temperature in the annealing furnace is maintained at 580-600 ℃, crystal lattices of the monofilaments, which are broken due to wiredrawing, are reagglomerated and arranged, and the monofilaments with the elongation at break of not less than 30% are obtained.
S13, twisting the multi-strand monofilaments in the same direction.
Further, the single strand conductor 10 is formed by forward twisting a plurality of filaments in a (1+6+12+18) manner. The single conductor 10 comprises a four layer structure in which the first layer in the middle is one monofilament, the second layer is six monofilaments, the third layer is twelve monofilaments, and the fourth layer is eighteen monofilaments. The single-strand conductor 10 obtained by adopting the twisting mode has good flexibility and large bending degree, and the conductor 10 has stable structure during bending, can not cause plastic deformation of the conductor 10, greatly improves the flexibility and stability of the cable, and is convenient for processing, manufacturing, installing and laying the cable.
S2, wrapping an inner mineral insulation layer 20 around the outer periphery of the single conductor 10, wherein the inner mineral insulation layer 20Has a resistivity of 1×l0 8 Ω.cm～1×l0 9 Ω.cm。
In one embodiment, the inner mineral insulation layer 20 includes a first mineral insulation layer 21 and a second mineral insulation layer 22. The first mineral insulation layer 21 and the second mineral insulation layer 22 are basalt strips. Therefore, the two layers of basalt strips are wrapped on the periphery of the single-stranded conductor 10, so that electric field concentration caused by direct contact of the middle mineral insulating layer 30 with the conductor 10 can be avoided, the electric field can be homogenized, the pulse voltage can be buffered during frequency modulation, the middle mineral insulating layer 30 is prevented from being broken down, and the service life of the cable is further prolonged.
Further, the horizontal wrapping machine is used for wrapping the first mineral insulating layer 21 on the periphery of the single-strand conductor 10 in a zero-lap mode, and the side edges of two adjacent circles of the first mineral insulating layer 21 are spliced after wrapping, so that gaps are avoided between the side edges of the two adjacent circles of the first mineral insulating layer 21, or even if gaps occur, the gaps can be not more than 1mm.
The horizontal wrapping machine is used for wrapping the second mineral insulation layer 22 on the periphery of the first mineral insulation layer 21 in a zero-lap mode, and the side edges of two adjacent circles of the second mineral insulation layer 22 are spliced after wrapping. Meanwhile, the wrapped second mineral insulation layer 22 wraps the spliced part of the first mineral insulation layer 21 during wrapping.
Thus, in this step, the wrapping method of the first mineral insulation layer 21 and the second mineral insulation layer 22 can ensure that the first mineral insulation layer 21 and the second mineral insulation layer 22 are wrapped on the conductor 10 more closely, and no wrinkling occurs. Meanwhile, the wrapping method can also avoid the damage to the second mineral insulating layer 22 caused by the overlapping part of the first mineral insulating layer 21 and the damage to the middle mineral insulating layer 30 caused by the second mineral insulating layer 22, and can reduce the outer diameter of the whole cable, so that the heating efficiency of the magnetic metal sheath 50 is higher, the occupied volume of the cable in an oil pipe is reduced, and the oil pumping efficiency is increased.
S3, wrapping the intermediate mineral insulation layer 30 around the outer periphery of the inner mineral insulation layer 20, and forming the resistor of the intermediate mineral insulation layer 30The rate is 1×l0 14 Ω.cm～1×l0 15 Omega. Cm, the intermediate mineral insulation layer 30 comprises the following composition: siO (SiO) 2 (silica): 36 to 38%, al 2 O 3 (aluminum oxide): 11 to 14%, fe 2 O 3 (ferric oxide): 1 to 2%, mgO (magnesium oxide): 28 to 30%, K 2 O (potassium oxide): 10 to 12%, F (fluorine): 8 to 9%.
In one embodiment, the intermediate mineral insulating layer 30 includes a first intermediate mineral insulating layer 31 and a second intermediate mineral insulating layer 32. The first intermediate mineral insulating layer 31 and the second intermediate mineral insulating layer 32 are synthetic mica tapes containing fluorine elements, and the synthetic mica tapes containing fluorine elements are not broken even under a high-temperature environment of about 1200 ℃, have higher resistivity, can not cause the problems of aging, breaking and the like under a working environment of 350 ℃ for a long time, and improve the service life of the cable.
Wherein, the temperature of 350 ℃ is the highest heating temperature of the cable manufactured by adopting the manufacturing method of the corrosion-resistant heating flexible cable.
The first intermediate mineral insulating layer 31 is wrapped around the outer periphery of the second mineral insulating layer 22 and covers the splice of the second mineral insulating layer 22 when wrapped. The method for wrapping the first middle insulating layer 31 is the same as the method and principle for wrapping the first insulating layer 21, and will not be described again.
The second intermediate mineral insulation layer 32 is wrapped around the periphery of the first intermediate mineral insulation layer 31, and wraps the splice of the first intermediate mineral insulation layer 31 during wrapping. The method of wrapping the second middle insulating layer 32 is the same as the method and principle of wrapping the second insulating layer 22, and will not be described again.
In one embodiment, siO in the composition of the intermediate mineral insulating layer 30 2 (silica) has high hardness and heat resistance, and can improve the compression resistance and heat resistance of the intermediate mineral insulating layer 30.
Al in the composition of the intermediate mineral insulating layer 30 2 O 3 (aluminum oxide) has high melting point and hardness, and good corrosion resistance, and can improve the compression resistance of the intermediate mineral insulating layer 30Energy, heat resistance, and corrosion resistance.
Fe in the composition of the intermediate mineral insulating layer 30 2 O 3 The (ferric oxide) has a high melting point and corrosion resistance, and can improve the heat resistance and corrosion resistance of the intermediate mineral insulating layer 30.
MgO (magnesium oxide) in the composition of the intermediate mineral insulating layer 30 has high fire resistance and insulation, and can improve the heat resistance and corrosion resistance of the intermediate mineral insulating layer 30.
K in the composition of the intermediate mineral insulating layer 30 2 O (potassium oxide), which has a strong basicity, can adjust the acid-base properties of the intermediate mineral insulation layer 30.
F (fluorine) in the composition of the intermediate mineral insulating layer 30 can improve the high temperature resistance of the intermediate mineral insulating layer 30.
By restricting the proportion of each component in the intermediate mineral insulating layer 30, the intermediate mineral insulating layer 30 has good performances of compression resistance, heat resistance, corrosion resistance, acid and alkali resistance, high temperature resistance and the like.
S4, wrapping an outer mineral insulation layer 40 around the outer periphery of the middle mineral insulation layer 30, wherein the resistivity of the outer mineral insulation layer 40 is 1×l0 8 Ω.cm～1×l0 9 Ω.cm。
In one embodiment, the outer mineral insulating layer 40 comprises a third mineral insulating layer 41 and a fourth mineral insulating layer 42. The third and fourth mineral insulating layers 41, 42 are basalt tape. In this way, the two layers of basalt tapes are wrapped around the periphery of the middle mineral insulating layer 30, so that electric field concentration caused by direct contact between the corrugated concave part of the magnetic metal sheath 50 and the middle mineral insulating layer 30 can be avoided, the effect of homogenizing the electric field can be achieved, and meanwhile, mechanical damage to the middle mineral insulating layer 30 caused by the magnetic metal sheath 50 can be avoided when the cable is bent.
The third mineral insulation layer 41 wraps around the outer periphery of the second intermediate mineral insulation layer 32, and wraps around the splice of the second intermediate mineral insulation layer 32 when wrapped. The wrapping method and principle of the third mineral insulation layer 41 are the same as those of the first mineral insulation layer 21, and will not be described again.
The fourth mineral insulation layer 42 is wrapped around the outer periphery of the third mineral insulation layer 41, and wraps the splice of the third mineral insulation layer 41 during wrapping. The wrapping method and principle of the fourth mineral insulation layer 42 are the same as those of the second mineral insulation layer 22, and will not be described again.
S5, wrapping the magnetic metal sheath 50 on the outer periphery of the outer mineral insulation layer 40.
In one embodiment, the magnetic metal sheath 50 is longitudinally wrapped around the periphery of the fourth mineral insulation layer 42, and includes the following steps:
s51, providing a steel belt and a plurality of dies, and galvanizing one side surface of the steel belt.
In one embodiment, the steel strip includes 1.2% by mass of C (carbon), 0.1% by mass of Si (silicon), 0.8% by mass of Mn (manganese), and 0.1% by mass of P (phosphorus). Mn (manganese) is used as a good deoxidizer and desulfurizing agent, so that an austenite region can be enlarged, the critical temperature of the steel belt is increased, the wear resistance of the steel belt is improved, and the eddy current loss is increased.
The surface of one side of the steel belt is galvanized, so that the steel belt can be prevented from being corroded, the cable can not be corroded or aged even if immersed in petroleum for a long time, the service life of the cable in thick oil is ensured, and the cable does not need to be recovered after shutdown.
It will be appreciated that other embodiments may be used in which the entire surface of the strip is galvanized.
S52, bending the galvanized steel strip for a plurality of times by a plurality of dies, and coating the galvanized steel strip on the periphery of the outer mineral insulation layer 40 to form the magnetic metal sheath 50, and forming a gap between the magnetic metal sheath 50 and the periphery of the outer mineral insulation layer 40.
In one embodiment, the galvanized steel strip is longitudinally wrapped with a longitudinal wrapping device comprising a wrapping device and a progressive device. Wherein the number of the cladding devices is plural, and the plural cladding devices are arranged at intervals along the advancing direction of the conductor 10. The number of the progressive devices is multiple, and one progressive device is arranged between two adjacent cladding devices. The progressive device can adopt mechanisms such as a conveyor belt, and compared with the progressive device, the progressive device is arranged between any two adjacent cladding devices, so that the conveying of the galvanized steel strip is more stable, the shaking of the galvanized steel strip in the conveying process is avoided, and the deviation of a welding seam of the galvanized steel strip in cladding welding is prevented.
When wrapping the galvanized steel strip, the upper roller with convex strip of the wrapping device and the lower roller meshed with the concave part of the edge form the tendency of rising at the two sides of the galvanized steel strip, and bend the galvanized steel strip from the two sides of the conductor 10 to the middle. Meanwhile, the galvanized steel strip is sequentially bent for seven times by the progressive devices, and after the last bending is completed by the progressive devices, the galvanized steel strip is bent to be in a circular ring shape, so that cladding is completed, stable cladding molding of the galvanized steel strip is ensured, and the zinc layer of the galvanized steel strip is effectively prevented from falling off.
Further, in order to facilitate seven times of bending of the galvanized steel strip, seven dies with different radians can be prepared in advance, and each die can be replaced independently, so that the seven dies can be spliced into metal cylinders with different outer diameters. Compared with a one-step molding die, the molding mode of the plurality of dies does not need to independently reform an independent die for each cable, and avoids crease caused by the fact that a steel belt cannot be completely attached to the die due to overlarge deformation degree of a single copper belt.
In particular, the coated magnetic metal sheath 50 forms a gap with the outer circumference of the outer mineral insulation layer 40, and the size of the gap is about 0.1 mm. This gap allows for subsequent welding and embossing of the magnetic metal sheath 50 and reduces wave trough damage to the fourth mineral insulating layer 42 at high temperatures and embossing when welding galvanized steel strips.
And S53, welding the magnetic metal sheath 50 on the periphery of the outer mineral insulating layer 40, and sealing the magnetic metal sheath 50.
In one embodiment, the magnetic metal sheath 50 is welded in a continuous manner by means of an argon tungsten-arc welding apparatus. The welding adopts direct current, high-frequency arc striking and non-melting argon tungsten arc for automatic continuous welding, the welding current is 20-80A (when the current is less than 20A, arc drift is easy to generate), and the arc voltage is 13+/-1V. Meanwhile, argon is used as shielding gas in welding, the flow of the shielding gas is 9+/-1L/min, and the phenomenon that the welding quality of the galvanized steel strip is affected due to the fact that the edge of the galvanized steel strip is oxidized in the welding process is prevented.
S54, embossing the magnetic metal sheath 50 to form a spiral corrugation on the outer periphery of the magnetic metal sheath 50.
In an embodiment, the magnetic metal sheath 50 is embossed by an embossing mold, and an eccentric spiral eccentric embossing is arranged on the circumferential surface of the embossing mold so as to process spiral waves on the magnetic metal sheath 50, thereby increasing the flexibility of the cable, enabling the cable to be easier to bend and facilitating the installation of the cable. At the same time, the cable is laid in oil and needs to withstand greater radial pressure, and the helical corrugation can withstand more radial pressure without causing deformation of the magnetic metal sheath 50 to damage the fourth mineral insulation layer 42.
Further, after the corrugation of the magnetic metal sheath 50 is finished, the magnetic metal sheath 50 will abut against the fourth mineral insulating layer 42 of the outer mineral insulating layer 40, so that the magnetic metal sheath 50 is attached to the fourth mineral insulating layer 42, and the magnetic metal sheath 50 and the fourth mineral insulating layer 42 are more tightly connected, so that the electric field distribution during the operation of the cable and the magnetic metal sheath 50 form similar concentric circles, and the heat energy generated by the eddy current of the magnetic metal sheath 50 in all directions is ensured to be equal, and the heating temperature of all positions outside the cable is ensured to be the same. At the same time, the embossing process can subject the magnetic metal sheath 50 to greater pressure, thereby protecting the interior of the cable.
In summary, in the method 100 for manufacturing the corrosion-resistant heating flexible cable of the present application, the magnetic metal sheath 50 is disposed outside the conductor 10, and when the current passes through the conductor 10, an eddy current is generated between the magnetic metal sheath 50 and the magnetic metal sheath 50, so that the magnetic metal sheath 50 generates heat, and the petroleum is heated. Meanwhile, the inner mineral insulating layer 20, the middle mineral insulating layer 30 and the outer mineral insulating layer 40 are arranged between the conductor 10 and the magnetic metal sheath 50, the middle mineral insulating layer 30 has higher high temperature resistance and resistivity, the problems of aging, fragmentation and the like can not occur even in a working environment of 350 ℃ for a long time, the service life of the cable is prolonged, the inner mineral insulating layer 20 and the outer mineral insulating layer 40 can not only avoid the concentration of an electric field caused by the direct contact of the middle mineral insulating layer 30 with the conductor 10, but also homogenize the electric field and buffer pulse voltage during frequency modulation, ensure that the middle mineral insulating layer 30 cannot be broken down, and further prolong the service life of the cable.
Example 1
The first and second mineral insulation layers 21 and 22 are sequentially wrapped around the outer circumference of the single conductor 10 in a zero-lap manner, and the first and second intermediate mineral insulation layers 31 and 32 are sequentially wrapped around the outer circumference of the second mineral insulation layer 22 in a zero-lap manner. Wherein the first and second intermediate mineral insulating layers 31 and 32 are fluorine-containing synthetic mica tapes. The components of the fluorine-containing synthetic mica tape include: 37% SiO 2 (silica), 12% Al 2 O 3 (aluminum oxide), 1.5% Fe 2 O 3 (ferric oxide), 29% MgO (magnesium oxide), 12% K 2 O (potassium oxide), and 8.5% F (fluorine).
Subsequently, the third mineral insulation layer 41 and the fourth mineral insulation layer 42 are wrapped in sequence around the outer periphery of the second intermediate mineral insulation layer 32 in a zero-lap manner.
Finally, the galvanized steel strip is coated on the periphery of the fourth mineral insulation layer 42, and then the galvanized steel strip and the fourth mineral insulation layer are welded to form the magnetic metal sheath 50, and the magnetic metal sheath 50 is embossed.
The cable prepared by the method of example 1 had a resistivity of 1×l0 for the intermediate mineral insulating layer 30 after multiple tests 14 Ω.cm～1×l0 15 The maximum heating temperature of the cable is 350 ℃, the uniformity of an internal electric field is achieved when the cable operates, and the cable can stably operate for 1 year under the temperature condition of 350 ℃.
Example 2
The first and second mineral insulation layers 21 and 22 are sequentially wrapped around the outer circumference of the single conductor 10 in a zero-lap manner, and the first and second intermediate mineral insulation layers 31 and 32 are sequentially wrapped around the outer circumference of the second mineral insulation layer 22 in a zero-lap manner. Wherein the first intermediate mineral insulating layer 31And the second intermediate mineral insulating layer 32 is a synthetic mica tape. The components of the synthetic mica tape include: 40% SiO 2 (silica), 14% Al 2 O 3 (aluminum oxide), 3% Fe 2 O 3 (ferric oxide), 31% MgO (magnesium oxide), 12% K 2 O (potassium oxide).
Subsequently, the third mineral insulation layer 41 and the fourth mineral insulation layer 42 are wrapped in sequence around the outer periphery of the second intermediate mineral insulation layer 32 in a zero-lap manner.
Finally, the galvanized steel strip is coated on the periphery of the fourth mineral insulation layer 42, and then the galvanized steel strip and the fourth mineral insulation layer are welded to form the magnetic metal sheath 50, and the magnetic metal sheath 50 is embossed.
The cable prepared by the method of example 2 had a resistivity of 1×l0 for the intermediate mineral insulating layer 30 after multiple tests 13 Ω.cm～1×l0 14 The highest heating temperature of the cable is 330 ℃, the uniformity of an internal electric field is common when the cable operates, and the cable is easy to fall off powder. In addition, the mica layer is easily detached when the cable kinks, resulting in breakdown of the insulation of the cable.
Example 3
The first and second mineral insulation layers 21 and 22 are sequentially wrapped around the outer circumference of the single conductor 10 in a zero-lap manner, and the first and second intermediate mineral insulation layers 31 and 32 are sequentially wrapped around the outer circumference of the second mineral insulation layer 22 in a zero-lap manner. Wherein the first and second intermediate mineral insulating layers 31 and 32 are made of a gold mica tape. The components of the gold mica tape include: 45% SiO 2 (silica), 15% Al 2 O 3 (aluminum oxide), 4% H 2 O (water), 28% MgO (magnesium oxide), 10% K 2 O (potassium oxide).
Subsequently, the third mineral insulation layer 41 and the fourth mineral insulation layer 42 are wrapped in sequence around the outer periphery of the second intermediate mineral insulation layer 32 in a zero-lap manner.
Finally, the galvanized steel strip is coated on the periphery of the fourth mineral insulation layer 42, and then the galvanized steel strip and the fourth mineral insulation layer are welded to form the magnetic metal sheath 50, and the magnetic metal sheath 50 is embossed.
The cable prepared by the method of example 3 had a resistivity of 1×l0 for the intermediate mineral insulating layer 30 after multiple tests 12 Ω.cm～1×l0 13 The highest heating temperature of the cable is 250 ℃, the uniformity of an internal electric field is common when the cable operates, and the service life of the cable is about ten months under the temperature environment of 250 ℃.
As shown in fig. 4, the present application further provides a corrosion-resistant heating flexible cable 200, which is manufactured by the manufacturing method 100 of the corrosion-resistant heating flexible cable, and is used for heating petroleum by being immersed in the petroleum after being laid in the oil pipe. The electric field of the corrosion-resistant heating flexible cable 200 is uniform, eddy current heating is adopted, the highest heating temperature is high, and the temperature reaches 350 ℃, so that petroleum can be well heated. In addition, the corrosion-resistant heating flexible cable 200 has a strong corrosion resistance and can be immersed in petroleum for a long time.
Specifically, the corrosion-resistant heating flexible cable 200 includes a conductor 10, an inner mineral insulating layer 20, an intermediate mineral insulating layer 30, an outer mineral insulating layer 40, and a magnetic metal sheath 50.
Wherein the conductor 10 is of a single strand construction. The inner mineral insulating layer 20, the intermediate mineral insulating layer 30, and the outer mineral insulating layer 40 are sequentially wrapped around the outer circumference of the conductor 10. The magnetic metal sheath 50 is wrapped around the outer periphery of the outer mineral insulating layer 40.
Referring to fig. 4 and fig. 5, in an embodiment, an outer circumferential surface of the magnetic metal sheath 50 is concavely provided with embossing grooves 52, and an inner circumferential surface of the magnetic metal sheath 50 is convexly provided with embossing protrusions 51. Embossing protrusions 51 and embossing grooves 52 are formed by embossing the magnetic metal sheath 50. The embossing protrusions 51 are disposed corresponding to the embossing grooves 52, and the embossing protrusions 51 abut against the outer peripheral surface of the fourth mineral insulation layer 42, so that the magnetic metal sheath 50 is more adhered to the outer mineral insulation layer 40.
Hereinabove, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those of ordinary skill in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present application without departing from the scope thereof. Such modifications and substitutions are intended to be within the scope of the present application.
Claims (10)
1. The manufacturing method of the corrosion-resistant heating flexible cable is characterized by comprising the following steps of:
providing a single strand conductor;
wrapping an inner mineral insulating layer around the outer periphery of the single conductor, the inner mineral insulating layer having a resistivity of 1×l0 8 Ω.cm～1×l0 9 Ω.cm；
Wrapping an intermediate mineral insulating layer around the outer periphery of the inner mineral insulating layer, the intermediate mineral insulating layer having a resistivity of 1×l0 14 Ω.cm～1×l0 15 Omega cm, the intermediate mineral insulation layer comprises the following components: siO (SiO) 2 :36 to 38%, al 2 O 3 :11 to 14%, fe 2 O 3 :1 to 2%, mgO:28 to 30%, K 2 O:10 to 12%, F:8 to 9%;
wrapping an outer mineral insulating layer around the periphery of the intermediate mineral insulating layer, the outer mineral insulating layer having a resistivity of 1×l0 8 Ω.cm～1×l0 9 Ω.cm；
And a magnetic metal sheath is coated on the periphery of the outer mineral insulating layer.
2. The method of manufacturing a corrosion resistant heating flexible cable according to claim 1, wherein the inner mineral insulation layer comprises a first mineral insulation layer and a second mineral insulation layer, the first mineral insulation layer is wrapped around the periphery of the single conductor, two adjacent turns of the side edges of the first mineral insulation layer are spliced, and the second mineral insulation layer is wrapped around the periphery of the first mineral insulation layer and is wrapped around the splice of the first mineral insulation layer during wrapping.
3. The method of manufacturing a corrosion resistant heating flexible cable according to claim 2, wherein the intermediate mineral insulation layer comprises a first intermediate mineral insulation layer and a second intermediate mineral insulation layer, the first intermediate mineral insulation layer is wrapped around the periphery of the second mineral insulation layer and covers the splice of the second mineral insulation layer when wrapped;
the second middle mineral insulating layer is wrapped on the periphery of the first middle mineral insulating layer and coats the spliced part of the first middle mineral insulating layer during wrapping.
4. The method of manufacturing a corrosion resistant heating flexible cable according to claim 3, wherein the outer mineral insulation layer comprises a third mineral insulation layer and a fourth mineral insulation layer, the third mineral insulation layer is wrapped around the second intermediate mineral insulation layer, and the splice of the second intermediate mineral insulation layer during wrapping is covered;
the fourth mineral insulating layer is wrapped on the periphery of the third mineral insulating layer and coats the spliced part of the third mineral insulating layer during wrapping.
5. The method of manufacturing a corrosion-resistant heating flexible cable according to claim 1, wherein the magnetic metal sheath is longitudinally wrapped around the outer periphery of the outer mineral insulating layer, and comprising the steps of:
providing a steel belt and a plurality of dies, and galvanizing one side surface of the steel belt;
coating the galvanized steel strip on the periphery of the outer mineral insulating layer after being bent for a plurality of times by a plurality of dies to form the magnetic metal sheath, and forming a gap between the magnetic metal sheath and the periphery of the outer mineral insulating layer;
welding the magnetic metal sheath to the periphery of the outer mineral insulating layer and sealing the magnetic metal sheath;
the magnetic metal sheath is embossed to form spiral waves on the periphery of the magnetic metal sheath.
6. The method of making a corrosion resistant heating flexible cable according to claim 5, wherein the corrugations of the magnetic metal sheath are held against the outer mineral insulating layer.
7. The method of manufacturing a corrosion resistant heating flexible cable according to claim 5, wherein the steel strip includes 1.2% by mass of C, 0.1% by mass of Si, 0.8% by mass of Mn, and 0.1% by mass of P.
8. The method of manufacturing a corrosion resistant heating flexible cable according to claim 1, wherein the preparation of the single strand conductor comprises the steps of:
drawing the metal rod to form a monofilament;
annealing the filaments at a temperature of 580 ℃ to 600 ℃;
and twisting the multiple strands of monofilaments in the same direction.
9. A corrosion-resistant heating flexible cable according to any one of claims 1 to 8, which is manufactured by a manufacturing method of the corrosion-resistant heating flexible cable, and comprises a conductor, an inner mineral insulating layer, an intermediate mineral insulating layer, an outer mineral insulating layer and a magnetic metal sheath, wherein the conductor is single-stranded, the inner mineral insulating layer, the intermediate mineral insulating layer and the outer mineral insulating layer are sequentially coated on the periphery of the conductor, and the magnetic metal sheath Bao Sheyu is arranged on the periphery of the outer mineral insulating layer.
10. The corrosion-resistant heating flexible cable according to claim 9, wherein the outer peripheral surface of the magnetic metal sheath is concavely provided with embossing grooves, the inner peripheral surface of the magnetic metal sheath is convexly provided with embossing protrusions, the embossing protrusions are arranged corresponding to the embossing grooves, and the embossing protrusions abut against the outer peripheral surface of the outer mineral insulating layer.
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| CN202311645846.6A CN117476297A (en) | 2023-12-01 | 2023-12-01 | Manufacturing method of corrosion-resistant heating flexible cable and corrosion-resistant heating flexible cable |
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