240-grade corona-resistant enameled flat wire and production process thereof

Abstract

The invention discloses a 240-grade corona-resistant enameled flat wire and a production process thereof. The 240-grade corona-resistant enameled flat wire comprises a copper flat wire body (10), and a high-temperature-resistant self-adhesive paint layer (20), an aromatic polyimide paint layer (30), a corona-resistant paint layer (40), a polyamide-imide paint layer (50) and a polytetrafluoroethylene coating (60) are sequentially arranged outside the copper flat wire body (10). The production process comprises the following steps: S1, preparing the flat wire; the round copper wire is subjected to wire drawing and calendaring operation through wire drawing equipment, and a copper flat wire is obtained; s2, continuously annealing and softening the flat wire main body and ultrasonically cleaning the flat wire main body with deionized water; and S3, painting: painting the copper flat wire body on a painting mechanism, firstly coating a high-temperature-resistant self-adhesive paint layer, then winding high-temperature-resistant glass fibers, and then sequentially coating an aromatic polyimide paint layer, a corona-resistant paint layer, a polyamide-imide paint layer and a polytetrafluoroethylene coating to obtain the enameled flat wire. The invention has the characteristic of effectively improving corona resistance and paint layer adhesion performance.

Description

Technical Field

[0001] The invention relates to an enameled flat wire, in particular to a 240-grade corona-resistant enameled flat wire and a production process thereof. Background Art

[0002] Enameled flat wire, also known as flat enameled wire, is a non-traditional enameled wire with a rectangular or square conductor cross section, which is widely used in various motors with high performance requirements. However, the existing traditional 240-grade flat enameled wire is generally composed of a flat copper wire and a multi-layer aromatic polyimide paint layer coated on the surface of the flat copper wire. On the one hand, its corona resistance is average and cannot meet the increasingly high corona resistance performance; on the other hand, due to the guide angle at the side end of the enameled flat wire, the paint layer at this location is easily separated from the copper flat wire body, and then the paint layer falls off. Summary of the invention

[0003] The object of the present invention is to provide a 240-grade corona-resistant enameled rectangular wire and a production process thereof. The present invention has the characteristics of being able to effectively improve the corona-resistant performance and the paint layer adhesion performance.

[0004] The technical solution of the present invention is a 240-grade corona-resistant enameled flat wire, comprising a copper flat wire body, on the outside of which a high-temperature-resistant self-adhesive paint layer, an aromatic polyimide paint layer, a corona-resistant paint layer, a polyamide-imide paint layer and a polytetrafluoroethylene coating are sequentially arranged.

[0005] In the aforementioned 240-grade corona-resistant enameled rectangular wire, the corona-resistant paint layer comprises a hyperbranched polyester-modified polyesterimide unsaturated resin layer, a heat-insulating coating, a nano-alumina-modified polyamideimide paint layer and a silicone-modified polyester paint layer.

[0006] In the aforementioned 240-grade corona-resistant enameled rectangular wire, a fluorinated polyetheretherketone paint is also provided outside the organosilicon-modified polyester paint layer.

[0007] In the aforementioned 240-grade corona-resistant enameled rectangular wire, a group of annular grooves arranged side by side along the length direction are provided on the outer surface of the hyperbranched polyester modified polyesterimide unsaturated resin layer, and a heat insulation layer is provided in the annular grooves.

[0008] In the aforementioned 240-grade corona-resistant enameled flat wire, the high-temperature-resistant self-adhesive paint layer is further spirally wound with high-temperature-resistant glass fibers, thereby improving the adhesion performance of the paint film and the tear resistance performance of the paint layer.

[0009] A production process for a 240-grade corona-resistant enameled flat wire comprises the following steps:

[0010] S1. Preparation of flat wire: round copper wire is drawn and rolled by wire drawing equipment to obtain copper flat wire;

[0011] S2, using a short-circuit DC annealing process to continuously anneal and soften the flat wire body to obtain an annealed flat copper wire, and then performing deionized water ultrasonic cleaning on the annealed flat copper wire to obtain a copper flat wire body;

[0012] S3. Painting: The copper flat wire body is painted on a painting mechanism, firstly coated with a high temperature resistant self-adhesive paint layer, then wound with high temperature resistant glass fiber, and then coated with an aromatic polyimide paint layer, a corona resistant paint layer, a polyamide-imide paint layer and a polytetrafluoroethylene coating in sequence to obtain an enameled flat wire.

[0013] In the aforementioned method for producing a 240-grade corona-resistant enameled flat wire, the coating process of the corona-resistant paint layer is as follows: first, a hyperbranched polyester modified polyesterimide unsaturated resin layer is coated on the surface of the aromatic polyimide paint layer, a group of annular thermal insulation grooves distributed side by side are pressed on the surface of the hyperbranched polyester modified polyesterimide unsaturated resin layer, and thermal insulation is coated in the annular thermal insulation grooves to form a thermal insulation layer, and then a thermal insulation coating, a nano-alumina modified polyamideimide paint layer, a silicone modified polyester paint layer and a fluorine-containing polyetheretherketone paint are sequentially coated.

[0014] Compared with the prior art, the present invention firstly arranges a high-temperature resistant self-adhesive paint layer on the outside of the copper flat wire body, which can not only adhere to the copper flat wire body, but also effectively improve the adhesion performance of the aromatic polyimide paint layer, thereby improving the adhesion performance of the overall paint layer, and effectively reducing the occurrence of separation between the paint layer and the copper flat wire body; the present application arranges a high-temperature resistant self-adhesive paint layer, an aromatic polyimide paint layer, a corona-resistant paint layer, a polyamide-imide paint layer and a polytetrafluoroethylene coating outside the copper flat wire body, so that the enameled wire can achieve 240-level high-temperature resistance, effectively improve the corona resistance performance, and also make the paint layer surface have good corrosion resistance and lubricity and non-stickiness.

[0015] In addition, the corona-resistant paint layer of the present application is composed of a hyperbranched polyester modified polyesterimide unsaturated resin layer, a thermal insulation coating, a nano-alumina modified polyamide-imide paint layer, a silicone modified polyester paint layer and a fluorinated polyetheretherketone paint, which can effectively improve the corona resistance and have good thermal insulation properties, and can also make the paint layer have good flexibility.

[0016] By spirally winding high-temperature resistant glass fiber outside the high-temperature resistant self-adhesive paint layer, the adhesion performance of the paint film can be improved while the tear resistance of the paint layer can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the enameled rectangular wire of the present invention;

[0018] Figure 2 It is a structural schematic diagram of an enameled flat wire surface detection device.

[0019] The markings in the accompanying drawings are: 1-movable base frame, 2-electric lifting frame, 3-mounting frame, 4-front and rear moving machine, 5-fixed frame, 6-front and rear surface detection assembly, 7-upper and lower surface detection assembly, 701-vertical mounting plate, 702-upper and lower double-headed hydraulic cylinder, 703-horizontal base plate, 704-detection plate, 705-first telescopic rod, 706-first spring, 707-first pressure sensor, 601-bracket, 602-front and rear double-headed hydraulic cylinder, 603-vertical base plate, 604-vertical detection base plate, 605-first Two telescopic rods, 606-second spring, 607-second pressure sensor, 8-movable wheel, 9-lifting fixed plate, 10-copper flat wire body, 20-high temperature resistant self-adhesive paint layer, 30-aromatic polyimide paint layer, 40-corona resistant paint layer, 50-polyamide-imide paint layer, 60-polytetrafluoroethylene coating, 401-hyperbranched polyester modified polyester imide unsaturated resin layer, 402-thermal insulation coating, 403-nano-alumina modified polyamide-imide paint layer, 404-silicone modified polyester paint layer, 405-fluorinated polyetheretherketone paint. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0021] Embodiment. A 240-grade corona-resistant enameled rectangular wire is composed of Figure 1 As shown, it comprises a copper flat wire body 10 , on the outside of which a high temperature resistant self-adhesive paint layer 20 , an aromatic polyimide paint layer 30 , a corona resistant paint layer 40 , a polyamide-imide paint layer 50 and a polytetrafluoroethylene coating 60 are sequentially arranged.

[0022] The corona-resistant paint layer 40 includes a hyperbranched polyester-modified polyesterimide unsaturated resin layer 401 , a heat-insulating coating layer 402 , a nano-alumina-modified polyamide-imide paint layer 403 and an organosilicon-modified polyester paint layer 404 .

[0023] The organosilicon-modified polyester paint layer 404 is further provided with a fluorine-containing polyetheretherketone paint 405 .

[0024] The outer surface of the hyperbranched polyester modified polyesterimide unsaturated resin layer 401 is provided with a group of annular grooves distributed side by side along the length direction, and a heat insulation layer is provided in the annular grooves.

[0025] The high temperature resistant self-adhesive paint layer 20 is further spirally wound with high temperature resistant glass fiber 70 to improve the adhesion performance of the paint film and the tear resistance performance of the paint layer.

[0026] A method for preparing a 240-grade corona-resistant enameled flat wire comprises the following steps:

[0027] S1. Preparation of flat wire: round copper wire is drawn and rolled by wire drawing equipment to obtain copper flat wire;

[0028] S2, using a short-circuit DC annealing process to continuously anneal and soften the flat wire body to obtain an annealed flat copper wire, and then performing deionized water ultrasonic cleaning on the annealed flat copper wire to obtain a copper flat wire body;

[0029] S3. Painting: The copper flat wire body is painted on a painting mechanism, firstly coated with a high temperature resistant self-adhesive paint layer, then wound with high temperature resistant glass fiber, and then coated with an aromatic polyimide paint layer, a corona resistant paint layer, a polyamide-imide paint layer and a polytetrafluoroethylene coating in sequence to obtain an enameled flat wire.

[0030] The coating process of the corona-resistant paint layer is as follows: first, a hyperbranched polyester modified polyesterimide unsaturated resin layer is coated on the surface of the aromatic polyimide paint layer, a group of annular heat-insulating grooves distributed side by side are pressed on the surface of the hyperbranched polyester modified polyesterimide unsaturated resin layer, and a heat-insulating material is coated in the annular heat-insulating groove to form a heat-insulating layer, and then a heat-insulating coating, a nano-alumina modified polyamideimide paint layer, a silicone modified polyester paint layer and a fluorinated polyetheretherketone paint are sequentially coated.

[0031] The high temperature resistant self-adhesive paint layer can be made of high temperature resistant resins such as phthalimide and polymaple or high temperature resistant adhesive polyester. The bonding temperature exceeds 240°.

[0032] During painting in step S3, high temperature resistant self-adhesive paint is applied on the surface of the copper flat wire body, and then high temperature resistant glass fiber is wound around the high temperature resistant self-adhesive paint, and then an aromatic polyimide paint layer is applied, and then the temperature is controlled to a bonding temperature so that the aromatic polyimide paint layer and the high temperature resistant self-adhesive paint layer are bonded.

[0033] Before winding, the enameled flat wire needs to be inspected by a surface inspection device. The surface inspection device for the enameled flat wire is composed of the following components: Figure 2 As shown, it includes a movable base frame 1, and electric lifting frames 2 are provided at the front and rear ends above the movable base frame 1, a mounting frame 3 is provided above each electric lifting frame 2, a front and rear moving mechanism 4 is provided above the mounting frame 3, a fixed frame 5 is provided above the front and rear moving mechanism 4, a front and rear surface detection component 6 is provided below the rear side of the fixed frame 5 at the front end, and an upper and lower surface detection component 7 is provided on the front side of the fixed frame 5 at the rear end; it also includes a main control board, a wireless transmission module is provided on the main control board, and the main control board is respectively connected to the electric lifting frame 2, the front and rear moving mechanism 4, the upper and lower surface detection component 7 and the front and rear surface detection component 6.

[0034] The upper and lower surface detection component 7 includes a vertical mounting plate 701 located on the side of the fixing frame 5 at the rear end, an upper and lower double-headed hydraulic cylinder 702 is provided on the vertical mounting plate 701, and the upper and lower output ends of the upper and lower double-headed hydraulic cylinder 702 are provided with a horizontal base plate 703, and the horizontal base plate 703 is provided with a detection plate 704 near the center side, and a first telescopic rod 705 and a first spring 706 are provided between the detection plate 704 and the horizontal base plate 703, and a first pressure sensor 707 corresponding to the position of the first spring 706 is also provided on the detection plate 704.

[0035] The front and rear surface detection component 6 includes a bracket 601 of a fixed frame 5 located at the front end, a front and rear double-headed hydraulic cylinder 602 is provided below the bracket 601, a vertical substrate 603 is provided at the output end of the front and rear double-headed hydraulic cylinder 602, a vertical detection substrate 604 is provided on the inner side of the vertical substrate 603, a second telescopic rod 605 and a second spring 606 are provided between the vertical substrate 603 and the vertical detection substrate 604, and a second pressure sensor 607 corresponding to the second spring 606 is also provided in the vertical substrate 603.

[0036] The movable bottom frame 1 is provided with movable wheels 8 at the four end corners at the bottom, and a lifting type fixing plate 9 is provided on the side of the movable wheel 8, and a ground mounting hole is provided on the lifting type fixing plate 9.

[0037] The forward and backward moving mechanism is a lead screw module.

[0038] The lifting type fixed plate comprises a telescopic rod, and a fixed plate is used at the bottom of the telescopic rod.

[0039] The electric lifting frames at the front and rear ends are staggered left and right.

[0040] Preferably, the shape of the vertical detection substrate corresponds to the shape of the enameled flat wire to be detected, and the vertical detection substrate is threadedly connected to the end of the second telescopic rod, so that it can better match the end of the enameled flat wire.

[0041] Detection process: Move the movable chassis to the bottom of the enameled flat wire area to be detected, and align the center line of the movable chassis with the enameled flat wire. Then lower the lifting fixed plate to the position in contact with the ground and fix it to the ground with screws. Then, adjust the positions of the front and rear surface detection components and the upper and lower surface detection components so that the two detection components correspond to the front and rear surfaces and the upper and lower surfaces of the enameled flat wire respectively, and start to detect the surface of the enameled wire. When paint tumors appear on the surface of the enameled flat wire, the detection plate at the corresponding position will be prompted to move, and then a certain pressure will be applied to the pressure sensor. After the pressure sensor detects the pressure signal, it will transmit the signal to the main control board. The main control board will issue corresponding alarm measures (such as connecting a buzzer alarm for sound alarm, connecting an alarm light for flashing reminder, and connecting to the control panel for reminder on the screen), and record the corresponding position. Taking the upper and lower surface detection components as an example, when paint nodules appear on the upper surface of the enameled flat wire, the enameled flat wire will pass through the horizontal detection plate, which will prompt the detection plate to move upward and squeeze the first spring. The first spring will transmit the force to the first pressure sensor, and the first pressure sensor will transmit the pressure signal to the main control board, thereby completing the real-time detection of the surface quality of the enameled wire.

[0042] Adjustment process of the front and rear surface detection components: the electric lifting frame at the front end begins to rise, driving the mounting frame and the components fixed thereon to begin to rise. After rising to the set position, the front and rear moving mechanism begins to drive the bracket and the front and rear surface detection components fixed on the bracket to begin to move backward until the center of the front and rear surface detection components matches the center of the enameled flat wire; then, the front and rear double-headed hydraulic cylinder begins to expand outward, so that the distance between the two vertical detection substrates distributed front and back is greater than the width of the enameled flat wire, and then the electric lifting frame begins to descend, so that the center of the vertical detection substrate in the height direction is flush with the enameled flat wire, and the front and rear double-headed hydraulic cylinder contracts inward, and finally moves the vertical detection substrate to a position and distance that matches the end face of the enameled flat wire.

[0043] Adjustment process of upper and lower surface detection components: the electric lifting frame at the rear end begins to rise, driving the mounting frame and the components fixed thereon to begin to rise. After rising to the set position, the front and rear moving mechanism begins to drive the vertical mounting plate and the upper and lower surface detection components fixed on the vertical mounting plate to begin to move forward until the center of the upper and lower surface detection components matches the center of the enameled flat wire; then, the upper and lower double-headed hydraulic cylinders begin to retract, so that the distance between the two upper and lower distributed detection plates matches the thickness of the enameled flat wire.

[0044] The surface detection device of the present application is provided with an electric lifting frame, a mounting frame and a front-to-back moving mechanism on the front and rear sides above the movable chassis, so that the detection device can be moved to any detection position, and the upper and lower surface detection components and the front and rear surface detection components can be adjusted in the up-down and front-to-back directions to meet the detection requirements of different positions. At the same time, the present application sets up independent upper and lower surface detection components and front and rear surface detection components to better adapt to the shape of the enameled flat wire and improve the detection accuracy; moreover, the upper and lower surface detection components and the front and rear surface detection components can also be fine-tuned in the up-down and front-to-back directions respectively to meet the detection requirements of enameled wires of different models, specifications and sizes and thicknesses.

Claims

1. A 240-grade corona-resistant enameled rectangular wire, characterized in that: The invention comprises a copper flat wire body (10), wherein a high temperature resistant self-adhesive paint layer (20), an aromatic polyimide paint layer (30), a corona resistant paint layer (40), a polyamide-imide paint layer (50) and a polytetrafluoroethylene coating layer (60) are sequentially arranged on the outside of the copper flat wire body (10).

2. The 240-grade corona-resistant enameled rectangular wire according to claim 1, characterized in that: The corona-resistant paint layer (40) comprises a hyperbranched polyester-modified polyesterimide unsaturated resin layer (401), a heat-insulating coating layer (402), a nano-alumina-modified polyamide-imide paint layer (403) and an organosilicon-modified polyester paint layer (404).

3. The 240-grade corona-resistant enameled rectangular wire according to claim 2, characterized in that: The organosilicon-modified polyester paint layer (404) is also provided with a fluorine-containing polyetheretherketone paint (405).

4. The 240-grade corona-resistant enameled rectangular wire according to claim 2, characterized in that: The outer surface of the hyperbranched polyester modified polyesterimide unsaturated resin layer (401) is provided with a group of annular partitions distributed side by side along the length direction, and a heat insulation layer is provided in the annular partitions.

5. The 240-grade corona-resistant enameled rectangular wire according to claim 1, characterized in that: The high temperature resistant self-adhesive paint layer (20) is also spirally wound with high temperature resistant glass fibers.

6. A production process for preparing a 240-grade corona-resistant enameled rectangular wire according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Preparation of flat wire; The round copper wire is drawn and rolled by the wire drawing equipment to obtain the copper flat wire; S2, using a short-circuit DC annealing process to continuously anneal and soften the flat wire body to obtain an annealed flat copper wire, and then performing deionized water ultrasonic cleaning on the annealed flat copper wire to obtain a copper flat wire body; S3. Painting: The copper flat wire body is painted on a painting mechanism, firstly coated with a high temperature resistant self-adhesive paint layer, then wound with high temperature resistant glass fiber, and then coated with an aromatic polyimide paint layer, a corona resistant paint layer, a polyamide-imide paint layer and a polytetrafluoroethylene coating in sequence to obtain an enameled flat wire.

7. The production process of a 240-grade corona-resistant enameled rectangular wire according to claim 6, characterized in that: The coating process of the corona-resistant paint layer is as follows: first, a hyperbranched polyester modified polyesterimide unsaturated resin layer is coated on the surface of the aromatic polyimide paint layer, a group of annular grooves distributed side by side are pressed on the surface of the hyperbranched polyester modified polyesterimide unsaturated resin layer, and a heat-insulating material is coated in the annular grooves to form a heat-insulating layer, and then a heat-insulating coating, a nano-alumina modified polyamideimide paint layer, a silicone modified polyester paint layer and a fluorinated polyetheretherketone paint are sequentially coated.

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