JPH0155724B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a baking furnace for enameled wire, and in particular to a baking furnace that uses the waste heat (combustion waste gas) of the baking furnace to preheat the core wire just before the enamel paint is applied. It is.

Generally, an apparatus for manufacturing enamel baked wire is based on a structure as shown in FIG. That is, the core wire 2 drawn out from the core wire supply bobbin 1 is fed into the paint tank 4 via the guide roller 3, and the paint 4A attached to the core wire 2 is squeezed by the floating die 5A in the die holder 5. The amount of coating (coating film thickness)
Then, the core wire 2 is guided into the baking furnace 7 through the lower insertion hole 6 to bake the applied paint 4A, and then passed through the upper insertion hole 8 into the baking furnace 7.
A baking process in which the core wire 2 pulled out is passed around the upper turn roller 9 and the lower turn roller 10 and sent into the baking furnace 7 via the paint tank 4, the floating die 5A, and the lower insertion port 6 again. The process is repeated several times, and the finished product (resin-baked electric wire) is baked and coated with the dried and solidified paint 4A, and then wound onto a winding bobbin 12 via a guide roller 11, and then discharged from the baking furnace 7. The fuel exhaust gas is treated by an exhaust gas device 13 and then released into the atmosphere.

By the way, in such a manufacturing device, the core wire 2 running between both turn rollers 9 and 10 is once led out of the baking furnace 7 every time a baking operation is performed, and is cooled to about room temperature by contact with air. Therefore, a good enamel coating cannot be deposited unless the running speed of the core wire is slowed down, and as a result, there is a problem that the baking efficiency is not very good.

The present invention has been made in view of the above-mentioned points, and its purpose is to preheat a core wire to which enamel paint is applied by using waste heat such as combustion waste gas released from a baking furnace. The purpose is to improve the baking speed of enamelled wire.

Hereinafter, one embodiment of the present invention will be described with reference to FIG.
A combustion waste gas introduction chamber 22 for introducing the combustion exhaust gas from the baking furnace 7 is defined by a cylindrical separating wall 23 that vertically penetrates the combustion waste gas introduction chamber 22. A core wire insertion preheating chamber 24 is defined for preheating the core wire 2 immediately before the coating material 4A is to be applied thereto. The combustion exhaust gas discharged from the baking furnace 7 is fed into the lower part of the combustion waste gas introduction chamber 22 via the supply pipe 25, and the fed combustion exhaust gas is fed from the upper part of the combustion waste gas introduction chamber 22. After being discharged to the outside through the discharge pipe 26 and treated by the exhaust gas device 13,
released into the atmosphere.

As is clear from the above configuration, when the baking furnace 7 is in operation, the combustion exhaust gas discharged from the baking furnace 7 is sent into the waste gas introduction chamber 22 and heats the cylindrical isolation chamber 23. The core wire 2 inserted through the wire insertion preheating chamber 24 can be fed into the paint tank 4 in a state where it has been preheated to an appropriate temperature for coating the paint 4A. Particularly in this case, the core wire 2 is heated while being isolated from the combustion exhaust gas by the cylindrical separation wall 23, so that it does not cause any inconvenience such as surface staining, and temperature unevenness is prevented by indirect heating from the surroundings. It is preheated smoothly without any heat generation. In addition, the presence of the combustion waste gas introduction chamber 22 prevents heat dissipation from the back part 7A of the baking furnace, so that the power consumption of heaters and other devices for maintaining the temperature inside the baking furnace at an appropriate temperature can be kept as low as possible. Therefore, it becomes possible to achieve energy savings.

As described above, according to the present invention, by skillfully utilizing the waste gas of the baking furnace to preheat the core and suppressing heat radiation from the back of the baking furnace, it is possible to improve baking work efficiency and reduce running costs. It is something that can be achieved.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal side view showing the overall configuration of a conventional enameled wire manufacturing apparatus, and FIG. 2 is a schematic longitudinal side view equivalent to FIG. 1 using an enameled wire baking furnace according to an embodiment of the present invention. It is. 2... Core wire, 4A... Paint, 7... Baking furnace, 7
A... Back, 21... Heat insulating wall, 22... Combustion waste gas introduction chamber, 23... Cylindrical isolation wall, 24... Core wire insertion preheating chamber, 25... Heating gas supply pipe, 26... Discharge pipe .

Claims (1)

[Claims] 1. A combustion waste gas introduction chamber 22 for introducing combustion exhaust gas from the baking furnace into the back part 7A of the baking furnace 7 is partitioned by a heat insulating wall 21, and a paint 4A is to be applied inside this combustion waste gas introduction chamber 22. An enameled wire baking furnace characterized in that a core wire insertion preheating chamber 24 for preheating the wire 2 is partitioned by a cylindrical separating wall 23.