Moistureproof high-voltage submersible motor winding wire and preparation method thereof
By adopting multi-layer insulating structure and composite fibers on the winding wire of the high-voltage submersible motor, the problem of poor insulation and mechanical properties of the winding wire in high-temperature, high-pressure and humidity environments is solved, and higher insulation and mechanical properties are achieved, extending the service life of the motor.
Patent Information
- Application Number
- CN202411791267.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-03-07
AI Technical Summary
The winding wire of the high-voltage submersible motor is easily damp in the downhole environment with high temperature, high pressure and high humidity, resulting in degradation of insulation performance and causing failures such as leakage and short circuits. Under the long-term high voltage, the insulating layer is easily broken down and aging, reducing the insulation effect and mechanical strength.
A multi-layer insulating structure is adopted that is sequentially coated from the inside to the outside, including polyimide film I, fluoroplastic and polyimide film II, and composite fibers composed of glass fibers and polyimide fibers are added to the fluoroplastic to improve the mechanical properties and insulation of the winding wires.
It significantly improves the insulation and mechanical properties of the winding wire, effectively prevents moisture and breakdown problems, extends the service life of the motor and improves its reliability in extreme environments.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of winding wires, and in particular to a moisture-proof high-voltage submersible motor winding wire and a preparation method thereof. Background Art
[0002] In the field of oil extraction, high-voltage submersible motors play an extremely important role. They can operate stably in the harsh environment underground and provide power support for the extraction of crude oil. With the continuous development of oil extraction technology, the performance requirements for high-voltage submersible motors are becoming increasingly stringent. High-voltage submersible motors work in the depths of oil wells thousands of meters underground and face complex working conditions of high temperature and high pressure. Due to the high humidity underground, ordinary winding wires are easily affected by moisture. Once affected by moisture, their insulation performance will be greatly reduced, causing leakage, short circuit and other faults of the motor, seriously affecting the normal operation and service life of the motor, and may even cause the paralysis of the entire oil production system, bringing huge economic losses and safety risks. Moreover, under high-voltage environment, the winding wire is subjected to huge electric field stress, which puts extremely high demands on the withstand voltage performance of its insulation material. Under the long-term high voltage action, the insulation layer of some existing winding wires is prone to breakdown and aging, which reduces its insulation effect and mechanical strength. In order to meet the needs of the continuous development of the oil extraction industry and ensure the reliable operation of high-voltage submersible motors in extreme environments, the development of a winding wire with good insulation and mechanical properties has become an urgent problem to be solved. Summary of the invention
[0003] The invention provides a moisture-proof high-voltage submersible motor winding wire and a preparation method thereof, which solves the problem of poor insulation and mechanical properties of the submersible motor winding wire in the related art.
[0004] The technical solution of the present invention is as follows: The present invention provides a moisture-proof high-voltage submersible motor winding wire, which comprises a conductor and an insulating layer from the inside to the outside in sequence, wherein the conductor is a round copper wire, the insulating layer comprises a first insulating layer, a second insulating layer and a third insulating layer, the first insulating layer is wrapped around the conductor, the second insulating layer is coated on the outside of the first insulating layer, the third insulating layer is coated on the outside of the second insulating layer, the first insulating layer is a polyimide film I, the second insulating layer is a fluoroplastic, the third insulating layer is a polyimide film II, the fluoroplastic comprises the following raw materials in parts by weight: 80-90 parts of polyperfluoroethylene propylene, 1-3 parts of a lubricant, 0.8-2 parts of an antioxidant, 1.5-2.5 parts of a compatibilizer, and 20-30 parts of a composite fiber, the composite fiber comprises glass fiber and polyimide fiber, and the mass ratio of the glass fiber to the polyimide fiber is 1:9-9:1.
[0005] As a further technical solution, the mass ratio of the glass fiber to the polyimide fiber is 3:2-5.
[0006] As a further technical solution, the method for preparing the composite fiber comprises the following steps: adding glass fiber and polyimide fiber into a hydrochloric acid aqueous solution for activation, and washing with water to obtain the composite fiber.
[0007] As a further technical solution, the concentration of the hydrochloric acid aqueous solution is 0.5 mol / L.
[0008] As a further technical solution, the glass fiber is a modified glass fiber, and the modified glass fiber is obtained by modifying the glass fiber with 11-hydroxytetradecanoic acid.
[0009] In the present invention, the glass fiber is modified by using 11-hydroxytetradecanoic acid, thereby further improving the mechanical properties and insulation properties of the winding wire.
[0010] As a further technical solution, the mass ratio of the 11-hydroxytetradecanoic acid to the glass fiber is 1-3:19.
[0011] In the present invention, the mechanical properties and insulation properties of the winding wire are further improved by limiting the mass ratio of 11-hydroxytetradecanoic acid to glass fiber to 1-3:19.
[0012] As a further technical solution, the preparation method of the modified glass fiber includes the following steps: adding 11-hydroxytetradecanoic acid to ethanol, then adding glass fiber for modification, and obtaining the modified glass fiber after drying.
[0013] As a further technical solution, the modification temperature is 40-50°C, and the modification time is 2-4h.
[0014] As a further technical solution, the method for preparing the composite fiber comprises the following steps: A1, adding a hydrochloric acid aqueous solution to activate the polyimide fiber, and washing with water to obtain an activated polyimide fiber; A2. Add modified glass fiber, activated polyimide fiber and di-sec-butylphenol polyoxyethylene ether into water, mix, and obtain composite fiber through drying.
[0015] As a further technical solution, the concentration of the hydrochloric acid aqueous solution is 0.5 mol / L.
[0016] As a further technical solution, the mixing temperature is 60-70° C., and the mixing time is 3-4 hours.
[0017] As a further technical solution, the addition amount of the di-sec-butylphenol polyoxyethylene ether is 8% to 10% of the total mass of the modified glass fiber and the activated polyimide fiber.
[0018] As a further technical solution, the lubricant includes one or both of polyethylene wax and calcium stearate.
[0019] As a further technical solution, the antioxidant includes one or two of 4,4'-di(phenylisopropyl)diphenylamine and N,N'-diphenyl-p-phenylenediamine.
[0020] As a further technical solution, the compatibilizer is maleic anhydride grafted polyethylene.
[0021] As a further technical solution, the thickness of the fluoroplastic is 0.5-1 mm.
[0022] As a further technical solution, the thickness of the first insulating layer is 0.5-0.6 mm.
[0023] As a further technical solution, the thickness of the third insulating layer is 0.2-0.3 mm.
[0024] As a further technical solution, the polyimide film I and the polyimide film II are made of different materials.
[0025] The present invention also provides a method for preparing a moisture-proof high-voltage submersible motor winding wire, comprising the following steps: S1, wrapping the polyimide film I around the outside of the conductor, and performing a first sintering to obtain a first insulating layer; S2, mixing the fluoroplastic raw materials, and extruding them outside the first insulating layer to obtain a second insulating layer; S3, wrapping the polyimide film II around the outside of the second insulating layer, and performing a second sintering to form a third insulating layer, thereby obtaining a moisture-proof high-voltage submersible motor winding wire.
[0026] The working principle and beneficial effects of the present invention are: In the present invention, by respectively coating the outer side of the conductor with polyimide film I, fluoroplastic and polyimide film II, the prepared winding wire has good mechanical properties and insulation. By adding composite fibers composed of glass fibers and polyimide fibers to the fluoroplastic, the mechanical properties and insulation of the winding wire are further improved, thereby solving the problem of poor mechanical properties and insulation of the winding wire of the submersible motor. DETAILED DESCRIPTION
[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0028] In the following embodiments and comparative examples: Glass fiber, diameter: 8~12μm, aspect ratio of 8:1; polyimide fiber, diameter: 6~16μm, length 1mm; polyperfluoroethylene propylene, model: NP-3180; di-sec-butylphenol polyoxyethylene ether, item number: 00085, purchased from Hubei Jiufenglong Chemical Co., Ltd.; polyimide film, thickness: 0.05mm, purchased from Kunshan Chenxin Adhesive Products Co., Ltd.; corona-resistant polyimide film, thickness: 0.125mm, purchased from Henan Ya'an Insulation Materials Factory Co., Ltd.; maleic anhydride grafted polyethylene, model: HDPE-g-MAH GR 205; polyethylene wax, model: AC-629A.
[0029] Example 1 A method for preparing a moisture-proof high-voltage submersible motor winding wire comprises the following steps: S1, after wrapping the corona-resistant polyimide film around the outside of the conductor, sintering it for the first time to obtain a first insulating layer with a thickness of 0.5 mm; S2, 80 parts of polyperfluoroethylene propylene, 1 part of polyethylene wax, 0.8 parts of 4,4'-di(phenylisopropyl)diphenylamine, 1.5 parts of maleic anhydride grafted polyethylene, and 20 parts of composite fiber are mixed, and then extruded outside the first insulating layer to obtain a second insulating layer with a thickness of 0.5 mm; S3, wrapping the polyimide film around the outside of the second insulating layer, and performing a second sintering to form a third insulating layer with a thickness of 0.2 mm, thereby obtaining a moisture-proof high-voltage submersible motor winding wire; The preparation method of composite fiber comprises the following steps: adding 10g glass fiber and 90g polyimide fiber into 0.5mol / L hydrochloric acid aqueous solution for activation, washing with water, and drying to obtain composite fiber.
[0030] Example 2 A method for preparing a moisture-proof high-voltage submersible motor winding wire comprises the following steps: S1, after wrapping the corona-resistant polyimide film around the outside of the conductor, sintering it for the first time to obtain a first insulating layer with a thickness of 0.6 mm; S2, 90 parts of polyperfluoroethylene propylene, 3 parts of calcium stearate, 2 parts of N,N'-diphenyl-p-phenylenediamine, 2.5 parts of maleic anhydride grafted polyethylene, and 30 parts of composite fiber are mixed, and then extruded outside the first insulating layer to obtain a second insulating layer with a thickness of 1 mm; S3, wrapping the polyimide film around the outside of the second insulating layer, and performing a second sintering to form a third insulating layer with a thickness of 0.3 mm, thereby obtaining a moisture-proof high-voltage submersible motor winding wire; The preparation method of composite fiber comprises the following steps: adding 90g glass fiber and 10g polyimide fiber into 0.5mol / L hydrochloric acid aqueous solution for activation, washing with water, and drying to obtain composite fiber.
[0031] Example 3 The only difference between this embodiment and embodiment 1 is that the added amount of glass fiber is 60 g and the added amount of polyimide fiber is 40 g.
[0032] Example 4 The only difference between this embodiment and embodiment 1 is that the added amount of glass fiber is 37.5 g and the added amount of polyimide fiber is 62.5 g.
[0033] Example 5 The only difference between this embodiment and Embodiment 4 is that the glass fiber is replaced by an equal amount of modified glass fiber, and the preparation method of the modified glass fiber includes: adding 2.2 g of 11-hydroxytetradecanoic acid to 400 mL of ethanol, adding 52.8 g of glass fiber, stirring at 50° C. for 3 hours, and obtaining the modified glass fiber after drying.
[0034] Example 6 The only difference between this embodiment and embodiment 5 is that the added amount of 11-hydroxytetradecanoic acid is 9.5 g and the added amount of glass fiber is 45.5 g.
[0035] Example 7 The only difference between this embodiment and embodiment 5 is that the added amount of 11-hydroxytetradecanoic acid is 2.75 g and the added amount of glass fiber is 52.25 g.
[0036] Example 8 The only difference between this embodiment and embodiment 5 is that the added amount of 11-hydroxytetradecanoic acid is 7.5 g and the added amount of glass fiber is 47.5 g.
[0037] Example 9 The difference between this embodiment and embodiment 8 is that the preparation method of the composite fiber includes the following steps: A1, adding 100g of polyimide fiber to a 0.5mol / L hydrochloric acid aqueous solution for activation, and washing with water to obtain activated polyimide fiber; A2. Add 37.5 g of modified glass fiber, 62.5 g of activated polyimide fiber, and 8 g of di-sec-butylphenol polyoxyethylene ether into 1 L of water, stir at 70° C. for 3 h, and then dry to obtain composite fiber.
[0038] Example 10 The difference between this embodiment and embodiment 9 is that the addition amount of di-sec-butylphenol polyoxyethylene ether is 10 g.
[0039] Comparative Example 1 The only difference between this comparative example and Example 1 is that the polyimide fiber is replaced by an equal amount of glass fiber.
[0040] Comparative Example 2 The only difference between this comparative example and Example 1 is that the glass fiber is replaced by an equal amount of polyimide fiber.
[0041] Comparative Example 3 The only difference between this comparative example and Example 1 is that in step S2, 80 parts of polyperfluoroethylene propylene, 1 part of polyethylene wax, 0.8 parts of 4,4'-di(phenylisopropyl)diphenylamine, 1.5 parts of maleic anhydride grafted polyethylene, 2 parts of glass fiber, and 18 parts of polyimide fiber are mixed and extruded on the outside of the first insulating layer to obtain a second insulating layer.
[0042] The elongation at break of the winding wires prepared in Examples 1 to 10 and Comparative Examples 1 to 3 were tested according to Test Method 6 in GB / T 4074.3-2004 "Test Methods for Winding Wires Part 3: Mechanical Properties", with a sample length of 250 mm; the breakdown voltage was tested at room temperature according to Method 4.5 in Test Method 13 in GB / T 4074.5-2004 "Test Methods for Winding Wires Part 5: Electrical Properties", and the test results are shown in Table 1.
[0043] Table 1 Winding wire performance test results
[0044] Compared with Comparative Examples 1 to 3, the elongation at break and the breakdown voltage of the winding wire prepared in Example 1 are higher than those of Comparative Examples 1 to 3, indicating that the addition of the composite fiber composed of glass fiber and polyimide fiber improves the mechanical properties and insulation of the winding wire.
[0045] Compared with Examples 3 to 4, 11-hydroxytetradecanoic acid was used to modify the glass fiber in Examples 5 to 8. As a result, the elongation at break and the breakdown voltage of the winding wire prepared in Examples 5 to 8 were higher than those in Examples 3 to 4, indicating that the mechanical properties and insulation of the winding wire can be further improved by modifying the glass fiber with 11-hydroxytetradecanoic acid. By comparing Examples 5 to 8, it was found that the elongation at break and the breakdown voltage of the winding wire prepared in Examples 7 to 8 were higher than those in Examples 5 to 6, indicating that when the mass ratio of 11-hydroxytetradecanoic acid to glass fiber is 1 to 3:19, the mechanical properties and insulation of the winding wire are higher.
[0046] Compared with Example 8, Examples 9-10 added di-sec-butylphenol polyoxyethylene ether to the composite fiber. As a result, the elongation at break and the breakdown voltage of the winding wire prepared in Examples 9-10 were higher than those in Example 8, indicating that adding 8% to 10% of di-sec-butylphenol polyoxyethylene ether to the composite fiber can further improve the mechanical properties and insulation of the winding wire.
[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A moisture-proof high-voltage submersible motor winding wire, characterized in that: The invention comprises a conductor and an insulating layer from the inside to the outside, wherein the conductor is a round copper wire, the insulating layer comprises a first insulating layer, a second insulating layer and a third insulating layer, the first insulating layer is wrapped around the conductor, the second insulating layer is coated on the outside of the first insulating layer, and the third insulating layer is coated on the outside of the second insulating layer, the first insulating layer is a polyimide film I, the second insulating layer is a fluoroplastic, the third insulating layer is a polyimide film II, the fluoroplastic comprises the following raw materials in parts by weight: 80-90 parts of polyperfluoroethylene propylene, 1-3 parts of a lubricant, 0.8-2 parts of an antioxidant, 1.5-2.5 parts of a compatibilizer, and 20-30 parts of a composite fiber, the composite fiber comprises glass fiber and polyimide fiber, and the mass ratio of the glass fiber to the polyimide fiber is 1:9-9:
1.
2. A moisture-proof high-voltage submersible motor winding wire according to claim 1, characterized in that: The mass ratio of the glass fiber to the polyimide fiber is 3:2-5.
3. The moisture-proof high-voltage submersible motor winding wire according to claim 1, characterized in that: The glass fiber is a modified glass fiber, and the modified glass fiber is obtained by modifying the glass fiber with 11-hydroxytetradecanoic acid.
4. A moisture-proof high-voltage submersible motor winding wire according to claim 3, characterized in that: The mass ratio of the 11-hydroxytetradecanoic acid to the glass fiber is 1-3:
19.
5. The moisture-proof high-voltage submersible motor winding wire according to claim 3, characterized in that: The preparation method of the modified glass fiber comprises the following steps: adding 11-hydroxytetradecanoic acid into ethanol, then adding glass fiber for modification, and obtaining the modified glass fiber after drying.
6. The moisture-proof high-voltage submersible motor winding wire according to claim 1, characterized in that: The method for preparing the composite fiber comprises the following steps: A1, adding a hydrochloric acid aqueous solution to activate the polyimide fiber, and washing with water to obtain an activated polyimide fiber; A2. Add modified glass fiber, activated polyimide fiber and di-sec-butylphenol polyoxyethylene ether into water, mix, and obtain composite fiber through drying.
7. The moisture-proof high-voltage submersible motor winding wire according to claim 6, characterized in that: The addition amount of the di-sec-butylphenol polyoxyethylene ether is 8% to 10% of the total mass of the modified glass fiber and the activated polyimide fiber.
8. The moisture-proof high-voltage submersible motor winding wire according to claim 1, characterized in that: The lubricant includes one or both of polyethylene wax and calcium stearate.
9. The moisture-proof high-voltage submersible motor winding wire according to claim 1, characterized in that: The antioxidant includes one or two of 4,4'-di(phenylisopropyl)diphenylamine and N,N'-diphenyl-p-phenylenediamine.
10. A method for preparing moisture-proof high-voltage submersible motor winding wire according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, wrapping the polyimide film I around the outside of the conductor, and performing a first sintering to obtain a first insulating layer; S2, mixing the fluoroplastic raw materials, and extruding them outside the first insulating layer to obtain a second insulating layer; S3, wrapping the polyimide film II around the outside of the second insulating layer, and performing a second sintering to form a third insulating layer, thereby obtaining a moisture-proof high-voltage submersible motor winding wire.