An ultrahigh-voltage multi-layer enameled wire and a processing technology thereof

Abstract

The application discloses a kind of superhigh pressure multilayer enameled wire and its processing technology, the superhigh pressure multilayer enameled wire includes copper conductor (100), the surface of copper conductor (100) is equipped with paint film, the paint film includes by inside to outside sequentially coated first ductility layer (200), corrosion-resistant layer (300) and second ductility layer (400), the first ductility layer (200) and second ductility layer (400) are coated with high ductility polyurethane paint, the corrosion-resistant layer (300) is coated with corrosion-resistant polyurethane paint, the thickness of the paint film is 72~144 μm.The application can improve the coating stability of enameled wire surface paint film, and facilitate the operation of operator.

Description

Technical Field

[0001] This invention relates to a processing technology for multilayer enameled wire, and more particularly to an ultra-high voltage multilayer enameled wire and its processing technology. Background Technology

[0002] The withstand voltage performance of conventional enameled wire is closely related to the thickness of the enamel layer on the surface of the wire, and the thickness of the enamel layer is related to the coating quality of the enameling machine. If the temperature of the enameling machine oven is too high or too low, it will cause problems such as insufficient curing or excessive aging of the enamel layer during baking, which will affect the stability of subsequent coating.

[0003] To address the above issues, existing enameling machines employ various methods to improve the temperature control accuracy of hot air entering the oven and the heating element during heating, aiming to avoid temperature errors at the heating end of the oven. However, during the enameling wire's journey, inertia causes some external air to enter the oven along with it. This air mixes with the internal air at the oven's front end, causing a drop in the actual temperature of that area and reducing the baking stability of the enamel film. Furthermore, changes in the wire's journey speed alter the airflow entering the oven, increasing the difficulty for manufacturers to control the oven's front-end temperature. On the other hand, if any enameling wire breaks, the external air that entered with it disappears, causing a sudden temperature change at the oven's front end on both sides. This makes it difficult for manufacturers to pre-adjust the oven temperature for such emergencies. These limitations limit the number of enamel coats that existing enameling machines can consistently control to within twenty layers, thus reducing the enamel thickness and pressure resistance of the enameled wire.

[0004] In addition, the conventional enameling machine coating method involves creating a paint groove on the surface of the coating roller, immersing the bottom of the groove in paint, and passing the copper wire through the top of the groove. The rotation of the coating roller then wets the copper wire with paint, achieving the coating effect. Building upon this, to achieve layered coating of the enameled wire, with different types of paint applied to different layers, manufacturers often arrange multiple coating rollers side-by-side, with the paint grooves on each roller staggered. This allows different types of paint to be sequentially applied to the wire surface during the cyclic coating process, as shown in patent 201120400136.3.

[0005] However, the drawback of this coating structure is that, since the existing paint tanks are directly machined onto the surface of the coating roller, the number of paint coats and the thickness of different paint layers on the enameled wire surface are limited by the number of paint tanks on the coating roller. This forces manufacturers to replace the entire coating roller to control the coating effect, resulting in high equipment costs. On the other hand, because the existing coating rollers are rotatably connected to the frame via conventional connecting parts such as bearings, it is difficult for manufacturers to quickly disassemble and assemble the coating rollers, thus increasing the difficulty of replacing them.

[0006] Therefore, existing multilayer enameled wires suffer from poor coating stability and difficulties in operation during processing. Summary of the Invention

[0007] The purpose of this invention is to provide an ultra-high voltage multilayer enameled wire and its processing technology. This improves the coating stability of the enameled wire surface and facilitates operation by workers.

[0008] The technical solution of the present invention is as follows: an ultra-high voltage multilayer enameled wire, comprising a copper conductor, the surface of which is provided with an enamel film, the enamel film comprising an inner first toughness layer, a corrosion-resistant layer and a second toughness layer coated sequentially from the inside out, the first toughness layer and the second toughness layer being coated with high-toughness polyurethane enamel, the corrosion-resistant layer being coated with corrosion-resistant polyurethane enamel, and the thickness of the enamel film being 72-144 μm.

[0009] In the aforementioned ultra-high voltage multilayer enameled wire, the first toughening layer, the corrosion-resistant layer, and the second toughening layer have the same structure, each consisting of twelve polyurethane monolayers, with each polyurethane monolayer having a thickness of 2 to 4 μm.

[0010] In the aforementioned ultra-high voltage multilayer enameled wire, the first toughening layer and the second toughening layer each include ten polyurethane monolayers, each polyurethane monolayer having a thickness of 2 to 4 μm, and the corrosion-resistant layer includes sixteen polyurethane monolayers, each polyurethane monolayer having a thickness of 2 to 4 μm.

[0011] The aforementioned processing technology for ultra-high voltage multilayer enameled wire includes the following steps:

[0012] ① A layer of polyurethane varnish is applied to the surface of the copper wire by the varnishing shaft at the front end of the enameling machine, and the copper wire is then put into the baking oven of the enameling machine after varnishing to obtain A enameled wire.

[0013] ②After entering the enameled wire oven, wire A passes through the pre-drying zone, where the pre-drying gas mixes and adjusts the temperature of the external air that enters with wire A, so that the air accompanying wire A when it leaves the pre-drying zone reaches the specified temperature range, thus obtaining wire B.

[0014] ③ After leaving the pre-baking zone, the B enameled wire enters the heating zone, where the polyurethane varnish on the surface of the B enameled wire is baked, so that the polyurethane varnish of the B enameled wire forms a polyurethane monolayer after curing, resulting in the C enameled wire.

[0015] ④ After baking, the C-enameled wire is guided back to the front of the enameling machine. Then, steps ①-③ are repeated so that the surface of the C-enameled wire is coated with multiple polyurethane single layers to form the first toughness layer, the corrosion-resistant layer and the second toughness layer, respectively, to obtain the finished enameled wire.

[0016] This processing technology uses an enameling machine to process copper wires. The enameling machine includes a furnace body with multiple heating zones arranged side by side inside the furnace body. Each heating zone is used to bake the enamel film of one enameled wire. Adjacent heating zones are separated from each other by a first partition. Each heating zone has a pre-baking zone at its front end. Hot air ducts are connected to the outside of the heating zones, and pre-baking tubes are connected to the outside of the pre-baking zones.

[0017] The pre-drying tube is used to supply high-temperature air into the pre-drying zone, so that the pre-drying zone is at a specified air temperature.

[0018] The pre-baking zone is used to mix and regulate the temperature of the external air that enters the furnace along with the enameled wire, thereby reducing temperature fluctuations at the front end of the heating zone caused by the influence of external air.

[0019] In the aforementioned processing technology, the hot air duct assembly includes an air inlet duct at the front end of the heating zone and an air outlet duct at the rear end of the heating zone. The air inlet duct and the air outlet duct are interconnected via a circulating air duct. A first waste outlet duct, a first catalytic device, a second waste outlet duct, and a circulating fan are sequentially connected to the circulating air duct along the airflow direction. A waste discharge duct is connected to the outside of both the first and second waste outlet ducts. A control valve is installed on the second waste outlet duct. A second catalytic device, a first heat exchange device, and a waste discharge fan are sequentially connected to the waste discharge duct along the airflow direction. The first heat exchange device is connected to the middle of the pre-drying tube. One end of the pre-drying tube extends to the outside of the furnace body and is connected to a pre-drying fan. The other end of the pre-drying tube extends into the pre-drying zone.

[0020] The first heat exchange device is used to exchange heat between the air in the waste discharge pipe and the pre-drying pipe, so that the external air enters the pre-drying zone through the pre-drying pipe after being heated;

[0021] The control valve is used to adjust the air flow rate of the second waste outlet pipe, thereby controlling the air temperature entering the pre-drying zone by changing the heat exchange air temperature inside the waste outlet pipe.

[0022] In the aforementioned processing technology, the pre-baking zone and the heating zone are separated from each other by a second partition.

[0023] In the aforementioned processing technology, a second heat exchange device is provided between the first waste outlet pipe and the first catalytic device, which is connected to the circulating air duct. The second waste outlet pipe passes through the second heat exchange device and is connected to the waste discharge pipe.

[0024] In the aforementioned processing technology, the first heat exchange device and the second heat exchange device have the same structure, both including a heat exchange box. The two ends of the heat exchange box form a hot air inlet and a hot air outlet, respectively. The heat exchange box is equipped with a heat exchange tube, which is separated from the inner cavity of the heat exchange box. The two ends of the heat exchange tube form a cold air inlet and a cold air outlet, respectively.

[0025] The pre-drying pipe is connected to the cold air inlet and cold air outlet of the first heat exchanger, and the waste discharge pipe is connected to the hot air inlet and hot air outlet of the first heat exchanger.

[0026] The circulating air duct is connected to the cold air inlet and cold air outlet of the second heat exchanger, and the second waste outlet pipe is connected to the hot air inlet and hot air outlet of the second heat exchanger.

[0027] In the aforementioned processing technology, a temperature-regulating air duct is connected to the circulating air duct at the tail end of the heating zone, and the end of the temperature-regulating air duct extends to the outside of the furnace body and is connected to a temperature-regulating fan.

[0028] In the aforementioned processing technology, the front end of the furnace body is provided with multiple parallel painting shafts. The painting shafts are rotatably connected to the enameling machine via a pressing assembly. Each painting shaft has a paint dipping rack at its bottom. Each painting shaft is detachably connected to a paint coating tube. The paint coating tubes on different painting shafts are staggered with each other. One end of the painting shaft is connected to a gear transmission mechanism. The pressing assembly includes a split bracket and a pressure ring. There are multiple brackets, which are spaced apart below the painting shafts. Each bracket has a lower slot for fastening and connecting to the painting shaft. The pressure ring is fixed above the painting shaft and has multiple upper slots for fastening and connecting to the painting shaft. Each upper slot and the lower slot of a bracket form a limiting circular hole for rotatably connecting to the painting shaft after they are mutually enclosed.

[0029] In the aforementioned processing technology, multiple paint grooves are arranged side by side on the paint coating tube, and the number of paint grooves on the paint coating tubes in different paint application shafts may be the same or different.

[0030] In the aforementioned processing technology, the painting shaft is composed of multiple split shafts connected in sequence, with transmission connections between adjacent shafts. Each shaft is connected to a paint sprayer. The shafts on different painting shafts are arranged in sequence along the routing direction to form separate painting areas. There are multiple pressure rings, and each pressure ring is simultaneously connected to each shaft in a painting area. Adjacent shafts are connected to each other via insert plates. Each shaft end is provided with a through groove for fastening and connecting the insert plate.

[0031] In the aforementioned processing technology, the two ends of the paint coating tube are provided with positioning rings, and positioning screws are threaded onto the positioning rings. After the positioning screws are screwed in, they axially limit the paint coating tube.

[0032] In the aforementioned processing technology, the gear transmission mechanism consists of a driving gear and a driven gear that are distributed vertically and mesh with each other. A drive motor is connected to one side of the driving gear. The driving gear is slidably connected to the motor shaft of the drive motor and fixed to each other by bolts. The end of the driving gear extends to the outside of the motor shaft and meshes with the driven gear. The driven gear is detachably connected to the end of the painting shaft.

[0033] Compared with the prior art, the present invention has the following characteristics:

[0034] (1) The present invention mixes and adjusts the temperature of the external air that enters with the enameled wire by setting the pre-drying gas in the pre-drying zone, so that the temperature of the air entering the heating zone with the enameled wire can be within the specified temperature range. The manufacturer can preheat the front end of the oven according to the temperature range, so that the actual temperature of the heating zone during operation is consistent with the temperature set by the manufacturer, effectively preventing the influence of external air on the oven temperature, thereby improving the coating stability of the enameling machine.

[0035] (2) Based on this, the present invention further defines the structure of the enameling machine for this processing technology; by separating each heating zone from each other through the first partition, the influence of any broken enameled wire on the temperature of the heating zones on both sides can be avoided, thereby improving the temperature control accuracy of each heating zone; by defining the connection structure of the hot air pipe group and the pre-drying pipe, it can utilize the exhaust gas discharged from the oven during the production process to heat the external air entering from the pre-drying pipe, thereby improving the utilization rate of exhaust gas and achieving energy saving effect; by setting the control valve on the second exhaust pipe, the manufacturer can adjust the air mixing ratio of the first exhaust pipe and the second exhaust pipe based on the heating temperature of the pre-drying zone, thereby achieving the heating temperature control of the air in the pre-drying pipe, so that the pre-drying zone reaches the specified temperature after the air is filled, further improving the temperature control effect of the present invention; and with the above combination, the number of paint layers on the surface of the enameled wire in the present invention can reach thirty-six layers, and the paint film thickness can reach 72-144μm, thereby effectively improving the pressure resistance of the enameled wire;

[0036] (3) By detachably connecting the paint tube to the paint shaft, the manufacturer can adjust the number of paint coats and the paint layer thickness of the enameled wire by replacing the paint tube separately, thereby reducing the manufacturer's replacement cost; on this basis, by limiting the structure of the pressing component, the manufacturer can remove the pressure ring and directly pull out the paint shaft in the vertical direction when replacing the paint shaft, thereby effectively reducing the difficulty of disassembling and assembling the paint shaft and facilitating the replacement of the paint tube by the operators.

[0037] (4) By pressing multiple painting shafts simultaneously with a single bracket, each painting shaft can remain at the same height after pressing, thereby ensuring the painting stability of the enameled wire when running horizontally, avoiding the decrease in painting stability caused by the installation error of the painting shaft, and facilitating the installation and positioning of the operator; on this basis, by setting the painting shafts in a split manner and pressing the shafts in different painting areas with multiple brackets, on the one hand, the length, weight and number of paint tubes of each painting shaft can be reduced, thus facilitating the manufacturer's disassembly and assembly; on the other hand, when the operator needs to disassemble and replace the shaft in any painting area, the individual disassembly and assembly of the shaft can be achieved without affecting the connection stability of other shafts, further reducing the operator's operational difficulty;

[0038] Therefore, the present invention can improve the coating stability of the enamel film on the surface of enameled wire and facilitate the operation of operators. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the ultra-high voltage multilayer enameled wire in Example 1;

[0040] Figure 2 This is a schematic diagram of the enameling machine in Example 1;

[0041] Figure 3 This is a diagram showing the distribution structure of the heating zone in Example 1;

[0042] Figure 4 yes Figure 2 View from direction A;

[0043] Figure 5 yes Figure 4 Sectional view along direction B;

[0044] Figure 6 This is a schematic diagram of the structure of the ultra-high voltage multilayer enameled wire in Example 2;

[0045] Figure 7 This is a schematic diagram of the enameling machine in Example 2;

[0046] Figure 8 yes Figure 7 The C-direction view.

[0047] The labels in the attached diagram are as follows: 1-furnace body, 2-heating zone, 3-first baffle, 4-pre-drying zone, 5-pre-drying pipe, 6-air inlet pipe, 7-air outlet pipe, 8-circulating air pipe, 9-first catalytic converter, 10-circulating fan, 11-waste discharge pipe, 12-control valve, 13-second catalytic converter, 14-first heat exchanger, 15-waste discharge fan, 16-pre-drying fan, 17-second baffle, 18-second heat exchanger. 19-Temperature regulating air duct, 20-Painting shaft, 21-Painting cylinder, 22-Bracket, 23-Pressure ring, 24-Insert plate, 25-Positioning ring, 26-Driving gear, 27-Driven gear, 801-First waste outlet pipe, 802-Second waste outlet pipe, 201-Shaft body, 221-Lower slot, 231-Upper slot, 100-Copper wire, 200-First toughness layer, 300-Corrosion resistant layer, 400-Second toughness layer. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0049] Example 1. An ultra-high voltage multilayer enameled wire, configured as follows: Figure 1 As shown, the device includes a copper conductor 100, the surface of which is coated with a paint film. The paint film includes an inner first toughness layer 200, a corrosion-resistant layer 300, and a second toughness layer 400 coated sequentially from the inside out. The first toughness layer 200 and the second toughness layer 400 are both coated with high-toughness polyurethane paint, and the corrosion-resistant layer 300 is coated with corrosion-resistant polyurethane paint. The thickness of the paint film is 72-144 μm.

[0050] The first toughness layer 200, the corrosion-resistant layer 300, and the second toughness layer 400 have the same structure, each consisting of twelve polyurethane monolayers, each polyurethane monolayer having a thickness of 2 to 4 μm.

[0051] The processing technology for ultra-high voltage multilayer enameled wire includes the following steps:

[0052] ① A layer of polyurethane varnish is applied to the surface of the copper wire by the varnishing shaft at the front end of the enameling machine, and the copper wire is then put into the baking oven of the enameling machine after varnishing to obtain A enameled wire.

[0053] ②After entering the enameled wire oven, wire A passes through the pre-drying zone, where the pre-drying gas mixes and adjusts the temperature of the external air that enters with wire A, so that the air accompanying wire A when it leaves the pre-drying zone reaches the specified temperature range, thus obtaining wire B.

[0054] ③ After leaving the pre-baking zone, the B enameled wire enters the heating zone, where the polyurethane varnish on the surface of the B enameled wire is baked, so that the polyurethane varnish of the B enameled wire forms a polyurethane monolayer after curing, resulting in the C enameled wire.

[0055] ④ After baking, the C-enameled wire is guided back to the front of the enameling machine. Then, steps ①-③ are repeated so that the surface of the C-enameled wire is coated with multiple polyurethane single layers to form the first toughness layer, the corrosion-resistant layer and the second toughness layer, respectively, to obtain the finished enameled wire.

[0056] This processing technology uses an enameling machine to process copper wires. The enameling machine is configured as follows: Figure 2-5 As shown, it includes a furnace body 1, and multiple heating zones 2 are arranged side by side inside the furnace body 1. Each heating zone 2 is used to bake the enamel film of a single enameled wire. Adjacent heating zones 2 are separated from each other by a first partition 3. Each heating zone 2 has a pre-baking zone 4 at its front end. The heating zone 2 is connected to a hot air duct assembly, and the pre-baking zone 4 is connected to a pre-baking pipe 5.

[0057] The pre-drying tube 5 is used to supply high-temperature air into the pre-drying zone 4, so that the pre-drying zone 4 is at a specified air temperature.

[0058] The pre-baking zone 4 is used to mix and regulate the temperature of the external air that enters the furnace body 1 along with the enameled wire, thereby reducing temperature fluctuations at the front end of the heating zone 2 caused by the influence of external air.

[0059] The hot air duct assembly includes an air inlet duct 6 located at the front end of the heating zone 2 and an air outlet duct 7 located at the rear end of the heating zone 2. The air inlet duct 6 and the air outlet duct 7 are connected to each other via a circulating air duct 8. The circulating air duct 8 is sequentially connected along the airflow direction to a first waste outlet duct 801, a first catalytic device 9, a second waste outlet duct 802, and a circulating fan 10. The first waste outlet duct 801 and the second waste outlet duct 802 are simultaneously connected to a waste discharge duct 11. The second waste outlet duct 802 is equipped with a control valve 12. The waste discharge duct 11 is sequentially connected along the airflow direction to a second catalytic device 13, a first heat exchange device 14, and a waste discharge fan 15. The pre-drying tube 5 is connected to the first heat exchange device 14 in the middle. One end of the pre-drying tube 5 extends to the outside of the furnace body 1 and is connected to a pre-drying fan 16. The other end of the pre-drying tube 5 extends into the pre-drying zone 4.

[0060] The first heat exchange device 14 is used to exchange heat between the exhaust pipe 11 and the air in the pre-drying pipe 5, so that the external air enters the pre-drying zone 4 through the pre-drying pipe 5 after being heated.

[0061] The control valve 12 is used to adjust the air flow rate of the second waste outlet pipe 802, thereby controlling the air temperature entering the pre-drying zone 4 by changing the heat exchange air temperature inside the waste outlet pipe 11.

[0062] The pre-baking zone 4 and the heating zone 2 are separated from each other by the second partition 17.

[0063] A second heat exchange device 18 is provided between the first waste outlet pipe 801 and the first catalytic device 9, connecting to the circulating air duct 8. The second waste outlet pipe 802 passes through the second heat exchange device 18 and connects to the waste discharge pipe 11. The second heat exchange device 18 can exchange heat with the air discharged from the second waste outlet pipe 802, so that the temperature of the air at the heat exchange is lower than the air temperature after catalytic heating and higher than the air temperature before catalytic heating. That is, on the one hand, the air temperature in the waste discharge pipe 11 is controlled, and on the other hand, the energy-saving effect of the device is improved.

[0064] The first heat exchange device 14 and the second heat exchange device 18 have the same structure, both including a heat exchange box. The two ends of the heat exchange box form a hot air inlet and a hot air outlet, respectively. The heat exchange box is provided with a heat exchange tube, which is separated from the inner cavity of the heat exchange box. The two ends of the heat exchange tube form a cold air inlet and a cold air outlet, respectively.

[0065] The pre-drying pipe 5 is connected to the cold air inlet and cold air outlet of the first heat exchange device 14, and the waste discharge pipe 11 is connected to the hot air inlet and hot air outlet of the first heat exchange device 14.

[0066] The circulating air duct 8 is connected to the cold air inlet and cold air outlet of the second heat exchange device 18, and the second waste outlet pipe 802 is connected to the hot air inlet and hot air outlet of the second heat exchange device 18.

[0067] A temperature-regulating air duct 19 is connected to the circulating air duct 8 at the tail end of the heating zone 2. The end of the temperature-regulating air duct 19 extends to the outside of the furnace body 1 and is connected to a temperature-regulating fan.

[0068] The front end of the furnace body 1 is provided with two parallel painting shafts 20. The painting shafts 20 are rotatably connected to the enameling machine via a pressing assembly. Each painting shaft 20 has a dipping rack at its bottom for holding paint. Each painting shaft 20 is detachably connected to a coating cylinder 21. The coating cylinders 21 on different painting shafts 20 are staggered laterally. One end of the painting shaft 20 is connected to a gear transmission mechanism. The pressing assembly includes a split bracket 22 and a pressure ring 23. Both the bracket 22 and the pressure ring 23 are detachably connected. Attached to the enameling machine, there are multiple brackets 22 spaced apart below the upper paint shaft 20. Each bracket 22 is provided with a lower slot 221 for fastening and connecting to the upper paint shaft 20. The number of pressure rings 23 can be set to one or more as needed. The pressure rings 23 are fixed above the upper paint shaft 20 and are provided with multiple upper slots 231 for fastening and connecting to the upper paint shaft 20. Each upper slot 231 and the lower slot 221 of a bracket 22 form a limiting hole for rotating connection to the upper paint shaft 20 after they are surrounded by each other.

[0069] The paint coating cylinder 21 has multiple paint grooves arranged side by side. The length of the paint coating cylinder 21 and the number of paint grooves in different paint application shafts 20 can be freely set according to the manufacturer's needs.

[0070] The two ends of the paint coating tube 21 are provided with positioning rings 25. The positioning rings 25 and the paint coating tube 21 are integrally formed. Positioning screws are threaded onto the positioning rings 25. After the positioning screws are screwed in, they axially limit the position of the paint coating tube 21.

[0071] The gear transmission mechanism consists of a driving gear 26 and a driven gear 27 that are distributed vertically and mesh with each other. A drive motor is connected to one side of the driving gear 26. The driving gear 26 is slidably connected to the motor shaft of the drive motor and fixed to each other by bolts. The end of the driving gear 26 extends to the outside of the motor shaft and meshes with the driven gear 27. The driven gear 27 is detachably connected to the end of the paint-coating shaft 20.

[0072] The working principle of this invention is as follows: In use, the manufacturer places high-toughness polyurethane varnish in the dipping rack below the first coating shaft 20 and corrosion-resistant polyurethane varnish in the dipping rack below the second coating shaft 20. This allows the copper conductor to be coated with multiple layers of high-toughness polyurethane varnish by the first coating shaft 20, forming a first toughness layer 200. Then, multiple layers of corrosion-resistant polyurethane varnish are applied to the surface of the enameled wire by the second coating shaft 20, forming a corrosion-resistant layer 300. Finally, multiple layers of high-toughness polyurethane varnish are applied to the surface of the copper conductor by the first coating shaft 20, forming a second toughness layer 400. This combination allows the invention to apply two different varnishes to the surface of the enameled wire using a single enameling machine, improving the processing efficiency of the enameling machine.

[0073] When the hot air duct assembly and pre-baking tube 5 are operating, the circulating fan 10 draws air from each heating zone 2 into the circulating air duct 8 through the air inlet duct 6, and the air sequentially passes through the first waste outlet duct 801, the second heat exchange device 18, the first catalytic device 9, and the second waste outlet duct 802. When the air passes through the first waste outlet duct 801, part of the air enters the waste outlet duct 11 under the action of the waste exhaust fan 15, while the other part continues to flow forward along the circulating air duct 8. When the air passes through the second waste outlet duct 802, part of the air enters the waste outlet duct 11 under the action of the waste exhaust fan 15, while the other part continues to flow forward along the circulating air duct 8. After being catalytically heated by the first catalytic device 9, the air in the circulating air duct 8 re-enters each heating zone 2 through the air outlet duct 7, thereby achieving the baking of the enameled wire inside the furnace body 1. Before entering the air outlet duct 7, the air is mixed with the external air in a specific ratio through the temperature-regulating air duct 19, thereby achieving temperature control of the air entering the furnace body 1. The air discharged from the first waste outlet duct 801 and the second waste outlet duct 802 is mixed in a specific ratio after entering the waste discharge duct 11 to reach a specified temperature, and then undergoes catalytic heating through the second catalytic device 13 to reach the specified heat exchange temperature. Then, the air is heat-exchanged with the air in the pre-drying tube 5 through the first heat exchange device 14, so that the air in the pre-drying tube 5 reaches the specified pre-drying temperature after heat exchange and enters the pre-drying zone 4.

[0074] When the enameled wire enters the furnace body 1, the pre-drying gas in the pre-drying zone 4 mixes and regulates the temperature of the external air that enters with the enameled wire. This ensures that the temperature of the air entering the heating zone 2 along with the enameled wire is controlled within a predetermined range. Based on this, the manufacturer can preheat the temperature at the front end of the heating zone 2 according to the air temperature, thereby reducing the temperature fluctuations caused by the entry of cold external air into the furnace body 1. At the same time, the first partition 3 separates the air in different heating zones 2, thus avoiding the impact of adjacent enameled wires breaking on the furnace body temperature.

[0075] When the manufacturer needs to replace or adjust the paint cartridge 21 on the paint application shaft 20, the operator can directly remove the pressure ring 23 from the enameling machine, thereby releasing the restriction on the paint application shaft 20; then unscrew the bolt and remove the drive gear 26 to release the end restriction on the paint application shaft 20. After the restriction is released, the paint application shaft 20 can be pulled out vertically upwards, making it convenient for the manufacturer to replace the paint cartridge 21.

[0076] Example 2. An ultra-high voltage multilayer enameled wire, configured as follows: Figure 6As shown, the device includes a copper conductor 100, the surface of which is coated with a paint film. The paint film includes an inner first toughness layer 200, a corrosion-resistant layer 300, and a second toughness layer 400 coated sequentially from the inside out. The first toughness layer 200 and the second toughness layer 400 are both coated with high-toughness polyurethane paint, and the corrosion-resistant layer 300 is coated with corrosion-resistant polyurethane paint. The thickness of the paint film is 72-144 μm.

[0077] The first toughness layer 200 and the second toughness layer 400 each comprise ten polyurethane monolayers, each polyurethane monolayer having a thickness of 2 to 4 μm. The corrosion-resistant layer 300 comprises sixteen polyurethane monolayers, each polyurethane monolayer having a thickness of 2 to 4 μm.

[0078] The processing technology for ultra-high voltage multilayer enameled wire includes the following steps:

[0079] ① A layer of polyurethane varnish is applied to the surface of the copper wire by the varnishing shaft at the front end of the enameling machine, and the copper wire is then put into the baking oven of the enameling machine after varnishing to obtain A enameled wire.

[0080] ②After entering the enameled wire oven, wire A passes through the pre-drying zone, where the pre-drying gas mixes and adjusts the temperature of the external air that enters with wire A, so that the air accompanying wire A when it leaves the pre-drying zone reaches the specified temperature range, thus obtaining wire B.

[0081] ③ After leaving the pre-baking zone, the B enameled wire enters the heating zone, where the polyurethane varnish on the surface of the B enameled wire is baked, so that the polyurethane varnish of the B enameled wire forms a polyurethane monolayer after curing, resulting in the C enameled wire.

[0082] ④ After baking, the C-enameled wire is guided back to the front of the enameling machine. Then, steps ①-③ are repeated so that the surface of the C-enameled wire is coated with multiple polyurethane single layers to form the first toughness layer, the corrosion-resistant layer and the second toughness layer, respectively, to obtain the finished enameled wire.

[0083] This processing technology uses an enameling machine to process copper wires. The enameling machine is configured as follows: Figure 7-8 As shown, it includes a furnace body 1, and multiple heating zones 2 are arranged side by side inside the furnace body 1. Each heating zone 2 is used to bake the enamel film of a single enameled wire. Adjacent heating zones 2 are separated from each other by a first partition 3. Each heating zone 2 has a pre-baking zone 4 at its front end. The heating zone 2 is connected to a hot air duct assembly, and the pre-baking zone 4 is connected to a pre-baking pipe 5.

[0084] The pre-drying tube 5 is used to supply high-temperature air into the pre-drying zone 4, so that the pre-drying zone 4 is at a specified air temperature.

[0085] The pre-baking zone 4 is used to mix and regulate the temperature of the external air that enters the furnace body 1 along with the enameled wire, thereby reducing temperature fluctuations at the front end of the heating zone 2 caused by the influence of external air.

[0086] The hot air duct assembly includes an air inlet duct 6 located at the front end of the heating zone 2 and an air outlet duct 7 located at the rear end of the heating zone 2. The air inlet duct 6 and the air outlet duct 7 are connected to each other via a circulating air duct 8. The circulating air duct 8 is sequentially connected along the airflow direction to a first waste outlet duct 801, a first catalytic device 9, a second waste outlet duct 802, and a circulating fan 10. The first waste outlet duct 801 and the second waste outlet duct 802 are simultaneously connected to a waste discharge duct 11. The second waste outlet duct 802 is equipped with a control valve 12. The waste discharge duct 11 is sequentially connected along the airflow direction to a first heat exchange device 14, a second catalytic device 13, and a waste discharge fan 15. The pre-drying tube 5 is connected to the first heat exchange device 14 in the middle. One end of the pre-drying tube 5 extends to the outside of the furnace body 1 and is connected to a pre-drying fan 16. The other end of the pre-drying tube 5 extends into the pre-drying zone 4.

[0087] The first heat exchange device 14 is used to exchange heat between the exhaust pipe 11 and the air in the pre-drying pipe 5, so that the external air enters the pre-drying zone 4 through the pre-drying pipe 5 after being heated.

[0088] The control valve 12 is used to adjust the air flow rate of the second waste outlet pipe 802, thereby controlling the air temperature entering the pre-drying zone 4 by changing the heat exchange air temperature inside the waste outlet pipe 11.

[0089] The pre-baking zone 4 and the heating zone 2 are separated from each other by the second partition 17.

[0090] The first heat exchange device 14 includes a heat exchange box, with a hot air inlet and a hot air outlet at both ends of the heat exchange box. A heat exchange tube is provided inside the heat exchange box, and the heat exchange tube and the inner cavity of the heat exchange box are separated from each other. A cold air inlet and a cold air outlet are formed at both ends of the heat exchange tube.

[0091] The pre-drying pipe 5 is connected to the cold air inlet and cold air outlet of the first heat exchange device 14, and the waste discharge pipe 11 is connected to the hot air inlet and hot air outlet of the first heat exchange device 14.

[0092] A temperature-regulating air duct 19 is connected to the circulating air duct 8 at the tail end of the heating zone 2. The end of the temperature-regulating air duct 19 extends to the outside of the furnace body 1 and is connected to a temperature-regulating fan.

[0093] The bottom of the furnace body 1 can be equipped with an electric heating tube for auxiliary heating as needed.

[0094] The front end of the furnace body 1 is provided with two parallel painting shafts 20. The painting shafts 20 are rotatably connected to the enameling machine via a pressing assembly. Each painting shaft 20 has a dipping rack at its bottom for holding paint. Each painting shaft 20 is detachably connected to a coating cylinder 21. The coating cylinders 21 on different painting shafts 20 are staggered laterally. One end of the painting shaft 20 is connected to a gear transmission mechanism. The pressing assembly includes a split bracket 22 and a pressure ring 23. Both the pressure ring 23 and the pressure ring 22 are detachably connected to the enameling machine. There are multiple brackets 22, which are spaced apart below the upper paint shaft 20. Each bracket 22 is provided with a lower slot 221 for fastening and connecting to the upper paint shaft 20. The pressure ring 23 is fixed above the upper paint shaft 20 and is provided with multiple upper slots 231 for fastening and connecting to the upper paint shaft 20. Each upper slot 231 and the lower slot 221 of a bracket 22 are respectively enclosed to form a limiting circular hole for rotating connection to the upper paint shaft 20.

[0095] The paint coating cylinder 21 has multiple paint grooves arranged side by side, and the number of paint grooves in the paint coating cylinder 21 of different paint application shafts 20 may be the same or different.

[0096] The painting shaft 20 is composed of multiple split shafts 201 connected in sequence. Adjacent shafts 201 are connected by a transmission. Each shaft 201 is connected to a paint sprayer 21. The shafts 201 on different painting shafts 20 are arranged in sequence along the wiring direction to form a separate painting area. There are multiple pressure rings 23, and each pressure ring 23 is connected to each shaft 201 in a painting area. Adjacent shafts 201 are connected to each other by insert plates 24. Each shaft 201 has a through groove at its end for fastening and connecting to the insert plate 24.

[0097] The two ends of the paint coating tube 21 are provided with positioning rings 25. The positioning rings 25 and the paint coating tube 21 are integrally formed. Positioning screws are threaded onto the positioning rings 25. After the positioning screws are screwed in, they axially limit the position of the paint coating tube 21.

[0098] The gear transmission mechanism consists of a driving gear 26 and a driven gear 27 that are distributed vertically and mesh with each other. A drive motor is connected to one side of the driving gear 26. The driving gear 26 is slidably connected to the motor shaft of the drive motor and fixed to each other by bolts. The end of the driving gear 26 extends to the outside of the motor shaft and meshes with the driven gear 27. The driven gear 27 is detachably connected to the end of the paint-coating shaft 20.

[0099] Compared to Example 1, this example removes the second heat exchanger 18 and adjusts the relative positions of the second catalytic converter 13 and the first heat exchanger 14. This allows the catalytically heated air, after being discharged through the second waste pipe 802, to be directly mixed with the air discharged through the first waste pipe 801 in a specific ratio to reach a designated temperature, which is then used to exchange heat with the air inside the pre-drying tube 5. This allows the example to expand the temperature control range within the pre-drying zone 4, thus facilitating manufacturer adjustments.

[0100] On the other hand, by disassembling the painting shaft 20 into multiple shafts 201, the manufacturer can remove each shaft 201 individually during replacement, thereby reducing the operational difficulty for the manufacturer. By using a single pressure ring 23 to press the shafts 201 in each painting area, the height of the shafts 201 in that painting area can be limited, ensuring that each shaft 201 is at the same height position and improving its positioning accuracy. Furthermore, when the operator disassembles or installs a shaft 201 in any painting area, the shafts 201 in other painting areas can maintain their installation positions, further reducing the installation and positioning difficulty for the operator.

Claims

1. A processing technology for ultra-high voltage multilayer enameled wire, characterized in that, Includes the following steps: ① A layer of polyurethane varnish is applied to the surface of the copper wire by the varnishing shaft at the front end of the enameling machine, and the copper wire is then put into the baking oven of the enameling machine after varnishing to obtain A enameled wire. ②After entering the enameled wire oven, wire A passes through the pre-drying zone, where the pre-drying gas mixes and adjusts the temperature of the external air that enters with wire A, so that the air accompanying wire A when it leaves the pre-drying zone reaches the specified temperature range, thus obtaining wire B. ③ After leaving the pre-baking zone, the B enameled wire enters the heating zone, where the polyurethane varnish on the surface of the B enameled wire is baked, so that the polyurethane varnish of the B enameled wire forms a polyurethane monolayer after curing, resulting in the C enameled wire. ④ After baking, the C-enameled wire is guided back to the front of the enameling machine. Then, steps ①-③ are repeated so that the surface of the C-enameled wire is coated with multiple polyurethane single layers to form the first toughness layer, the corrosion-resistant layer and the second toughness layer, respectively, to obtain the finished enameled wire. The processing technology uses an enameling machine to process copper wires. The enameling machine includes a furnace body (1), and multiple heating zones (2) are arranged side by side inside the furnace body (1). Each heating zone (2) is used to bake the enamel film of one enameled wire. Adjacent heating zones (2) are separated from each other by a first partition (3). Each heating zone (2) has a pre-baking zone (4) at its front end. Hot air pipes are connected to the outside of the heating zone (2), and pre-baking pipes (5) are connected to the outside of the pre-baking zone (4). The pre-drying tube (5) is used to supply high-temperature air into the pre-drying zone (4) so ​​that the pre-drying zone (4) is at a specified air temperature; The pre-baking zone (4) is used to mix and adjust the temperature of the external air that enters the furnace body (1) along with the enameled wire, thereby reducing the temperature fluctuations at the front end of the heating zone (2) caused by the external air. The front end of the furnace body (1) is provided with multiple parallel painting shafts (20). The painting shafts (20) are rotatably connected to the enameling machine via a pressing assembly. Each painting shaft (20) has a paint dipping rack at its bottom. Each painting shaft (20) is detachably connected to a paint coating tube (21). The paint coating tubes (21) on different painting shafts (20) are staggered. One end of the painting shaft (20) is connected to a gear transmission mechanism. The pressing assembly includes a split bracket (22) and a pressure ring (23). The brackets (22) are multiple and spaced apart below the paint shaft (20). Each bracket (22) is provided with a lower slot (221) for fastening and connecting the paint shaft (20). The pressure ring (23) is fixed above the paint shaft (20) and is provided with multiple upper slots (231) for fastening and connecting the paint shaft (20). Each upper slot (231) and the lower slot (221) of a bracket (22) form a limiting hole for rotating connection of the paint shaft (20) after they are surrounded by each other. The painting shaft (20) is composed of multiple split shafts (201) connected in sequence. Adjacent shafts (201) are connected by transmission. Each shaft (201) is connected to a paint sprayer (21). The shafts (201) on different painting shafts (20) are arranged in sequence along the wiring direction to form a separate painting area. There are multiple pressure rings (23), and each pressure ring (23) is connected to each shaft (201) in a painting area at the same time. Adjacent shafts (201) are connected to each other through a plate (24). Each shaft (201) has a through groove for fastening and connecting the plate (24) at its end.

2. The processing technology according to claim 1, characterized in that: The hot air duct assembly includes an air inlet duct (6) located at the front end of the heating zone (2) and an air outlet duct (7) located at the rear end of the heating zone (2). The air inlet duct (6) and the air outlet duct (7) are connected to each other via a circulating air duct (8). The circulating air duct (8) is sequentially connected along the airflow direction to a first waste outlet duct (801), a first catalytic device (9), a second waste outlet duct (802), and a circulating fan (10). The exterior of the first waste outlet duct (801) and the second waste outlet duct (802) are the same as those of the second waste outlet duct. The first waste pipe (802) is connected to the second waste pipe (802) and a control valve (12) is provided on it. The second catalytic device (13), the first heat exchange device (14) and the waste exhaust fan (15) are connected sequentially along the airflow direction on the waste pipe (11). The first heat exchange device (14) is connected to the middle of the pre-drying pipe (5). One end of the pre-drying pipe (5) extends to the outside of the furnace body (1) and is connected to the pre-drying fan (16). The other end of the pre-drying pipe (5) extends into the pre-drying zone (4). The first heat exchange device (14) is used to exchange heat between the exhaust pipe (11) and the air in the pre-drying pipe (5), so that the external air enters the pre-drying zone (4) through the pre-drying pipe (5) after being heated; The control valve (12) is used to adjust the air flow of the second waste outlet pipe (802), thereby controlling the air temperature entering the pre-drying zone (4) by changing the heat exchange air temperature inside the waste outlet pipe (11).

3. The processing technology according to claim 2, characterized in that: A second heat exchange device (18) is provided between the first waste outlet pipe (801) and the first catalytic device (9) to connect the circulating air pipe (8), and the second waste outlet pipe (802) passes through the second heat exchange device (18) to connect the waste discharge pipe (11).

4. The processing technology according to claim 3, characterized in that: The first heat exchange device (14) and the second heat exchange device (18) have the same structure, both including a heat exchange box. The two ends of the heat exchange box form a hot air inlet and a hot air outlet, respectively. The heat exchange box is provided with a heat exchange tube. The heat exchange tube and the inner cavity of the heat exchange box are separated from each other. The two ends of the heat exchange tube form a cold air inlet and a cold air outlet, respectively. The pre-drying pipe (5) is connected to the cold air inlet and cold air outlet of the first heat exchange device (14) respectively, and the waste discharge pipe (11) is connected to the hot air inlet and hot air outlet of the first heat exchange device (14) respectively. The circulating air duct (8) is connected to the cold air inlet and cold air outlet of the second heat exchange device (18) respectively, and the second waste pipe (802) is connected to the hot air inlet and hot air outlet of the second heat exchange device (18) respectively.

Images