JPS6044766B2 - Enamel insulated wire manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing enamel insulated wires, particularly to an apparatus having a shaping and baking furnace.

Enamel insulated wires are usually manufactured by applying and baking enamel to an annealed copper wire or aluminum wire using a shaping enamel baking device.

The shaping enamel printing apparatus generally has a structure as shown in FIG. This device has a lower opening 3 at the lower end of a baking furnace 1 which has a built-in heater 2, and an upper opening 4 at the upper end.
In addition, a die 5 and an enamel liquid paint tank 6 are sequentially installed below the baking furnace 1, and annealed soft copper wire or soft aluminum wire W (hereinafter referred to as strand ) is passed through a paint tank 6 through a tan sieve 7 to apply enamel paint to its surface, which is then adjusted to a uniform and constant amount with a die 5, and then poured from the lower opening 3. After baking through the baking furnace 1, open the upper opening 4.
The paint is cooled and solidified through a cooling chamber 9 and drawn out through a tongue sheep 8. Normally, the above operation is repeated 6 to 8 times to produce enamel insulated wires, but in order to be economical, 10 to 30 wires are baked at the same time. The method is to manufacture it in a furnace. In this manufacturing process, when the enamel paint applied to the wire W is heated by the heater 2 to evaporate the solvent and harden the paint film, solvent exhaust gas is generated. A combustion chamber 10 is provided in the combustion chamber, and a preheater 11 and a catalyst 12 are provided in the combustion chamber, and the gas is mixed with air taken in from the lower opening 3 and heated as necessary by the preheater 11. The structure is such that the catalyst 12 causes reaction and combustion, a blower 13 releases a portion to the atmosphere, and a portion is circulated within the furnace 1 and reused for baking heating. In addition, since the baking furnace 1 generates upward air currents due to the chimney effect of the vertical and shaped furnaces, a gap 14 is provided at the outlet of the upper opening 4, and fresh air at high speed is blown from the outside through the gap to prevent this. There is. Note that 15 is an exhaust passage. The effective length of the shaped enamel baking furnace 1 varies depending on the type of furnace, but the standard is usually 5 to 8 m, and the baking temperature varies depending on the type of enamel paint and baking conditions. However, the temperature is usually set within the range of 400-500°C in the upper part of the furnace, 350-450°C in the middle part of the furnace, and 200-350°C in the lower part.

However, as mentioned above, the conventional vertical enamel printing apparatus has the following drawbacks.

First, since the structure of the baking furnace 1 is such that the exhaust gas heat after catalytic combustion is circulated and reused within the furnace 1, if a part of the exhaust gas heat after catalytic combustion is reused, the unburned amount contained in the exhaust gas will be reused. Solvents and low-molecular resins may condense during long-term operation and may adhere to the gap 14 where fresh cold air is blown from outside the furnace to prevent upward airflow in the furnace 1, or during baking. If it adheres to the strands W and is left as is, it will have a serious adverse effect on the product, so cleaning and maintenance must be carried out regularly.

In addition, in order to increase productivity, multiple baking furnaces 1 may be installed in parallel, but in such cases, one side of the baking furnaces in parallel may be shut down to stop combustion of exhaust gas, or due to other circumstances, exhaust gas When a change in quantity occurs, there is an uninterrupted temperature change that cannot be compensated for by the heater 2, which has a serious effect on the product being manufactured. This temperature change is particularly noticeable when the paint has a low resin content, or in other words, a high solvent content and high combustion heat. In view of these points, it is an object of the present invention to provide an apparatus for manufacturing an enameled insulated wire that solves the above-mentioned drawbacks. An exhaust suction section, an air chamber, and a cooling chamber are provided, and a preheater for preheating the exhaust gas, a catalyst, and an air chamber are provided inside the combustion chamber having the exhaust suction section. This is characterized in that the air chamber is provided with an exhaust gas path that accommodates a part of the pipe for the introduction air blowing path.

The present invention will be described in detail below with reference to the embodiment shown in FIG. 2. Reference numeral 21 includes a heater 22. It has a vertical baking furnace, and has a lower opening 23 at its lower end and an upper opening 24 at its upper end.

Below the baking furnace 21, a die 25 and a paint tank 26 for enamel paint are sequentially provided. The die 25 and the paint tank 26 are supported by a suitable support device. Further, above the upper opening 24 of the baking furnace 21, an exhaust gas suction section 36, which is a part of the combustion chamber 30, an air chamber 34, and a cooling chamber 29 are sequentially provided. Reference numeral 30 denotes a combustion chamber, and only a part of the exhaust suction section 36 is connected to the upper opening 24 of the baking furnace 21 and the air chamber 3.
4, and the other parts are placed outside the baking furnace 21.

The combustion chamber 30 includes an exhaust gas passage 35 that can accommodate a preheater 31 for preheating the exhaust gas, a catalyst 32, and a part 33 of a pipe for blowing fresh air outside the furnace. Furthermore, the air chamber 34 is provided with a fresh air blowing path 33 from the outside.
On the way, the fresh air passes through a suitable place in the exhaust gas path 35 and communicates with it, and the fresh air exchanges heat with the catalytically combusted high-temperature exhaust gas and is blown into the air chamber.
The strand W annealed by the tan sheave 27
Enamel paint was applied to the surface through the paint tank 26 via the paint tank 26, and then the coating amount was adjusted to a uniform and constant amount using the die 25, and the paint was passed through the baking furnace 21 through the lower opening 23 to be baked. After that, the exhaust gas is passed through the upper opening 24 through the exhaust suction section 36, which is a part of the combustion chamber 30, the air chamber 34, and the cooling chamber 29, where it is cooled and solidified and extracted through the tongue sieve 28. Repeat this process several times to produce an enamel insulated wire. At this time, the solvent gas vaporized in the furnace 21 enters the combustion chamber 30 from the upper opening 24 of the furnace 21 through the exhaust suction section 36, where it is first heated as necessary by the preheater 31, and then the catalyst 32, and the combustion gases are discharged to the suction atmosphere by a blower (not shown) outside the furnace. It is important to keep this release amount to the minimum necessary. Further, the rising air current within the furnace 21 is suppressed by blowing fresh air, which has undergone heat exchange with the exhaust gas, into the air chamber 34 from the blowing path 33.・At this time, catalyst 3
The exhaust gas after the second pass is as high as 400 to 600℃, so
The air that exchanges heat with the exhaust gas is heated to a temperature of 200° C. or higher at which unburned exhaust gas condenses and adheres to the air. Therefore, the fresh air used for heat exchange must be kept at a temperature (2
It is important to determine the length of the heat exchanger, the amount of exhaust gas sucked, etc. so that the temperature is higher than 00°C. As described above, in the present invention, in order to prevent the rising air current containing the solvent exhaust gas in the furnace 21 from flowing into the cooling chamber 29
The fresh air blown into the combustion chamber 3 (air curtain device)
Temperature (200°C or higher) at which the solvent and low-molecular resin in the solvent exhaust gas do not condense due to heat exchange in the exhaust gas path of 0.
This completely eliminates accidents caused by condensation of solvents and low-molecular resins in solvent exhaust gas.

Further, the present invention burns the solvent exhaust gas generated in the furnace 21 in the combustion chamber 30, uses the generated combustion heat to heat the fresh air blown into the air chamber 34, and then all of the exhaust gas is discharged outside the apparatus. Since the gas is discharged and is not circulated into the furnace 21 at all, there is no need for a circulation prower like in conventional equipment, and the furnace 2
The excess air flowing into the furnace 21 from the lower opening 23 of the furnace 21 can be easily controlled, so that evaporation of the enamel solvent in the furnace 21, combustion in the air chamber 30, heat exchange, exhaust, etc. are carried out regularly. become.

Further, in the present invention, since the enamel paint is dried and hardened only by the heating of the heater 22 in the furnace 21, there is no sudden change in the inside of the furnace 21, and a stable baking atmosphere is always obtained. As described above, the present invention has many effects such as the energy consumption required for heating during running is greatly reduced compared to the conventional vertical baking furnace.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing a conventional enamel insulated wire manufacturing apparatus, and FIG. 2 is a schematic sectional view showing an embodiment of the present invention. 21...Vertical baking furnace, 22...Heater, 30...Combustion chamber, 33...New air blowing route, 34...Air chamber , 35...
...Exhaust gas route, 36...Exhaust intake section.

Claims (1)

[Claims] 1. An exhaust suction port 36, which is a part of the combustion chamber 30, an air chamber 34, and a cooling chamber 29 are sequentially installed on the upper opening 24 of the vertical baking furnace 21 containing the heater 22. The upper opening 2 is provided on the outside of the suction port 36.
A combustion chamber 30 is arranged to combust the exhaust gas from the furnace 21 which is sucked in from the suction part 36 via the combustion chamber 4,
A preheater 31 for preheating the exhaust gas is provided inside the combustion chamber 30,
An apparatus for manufacturing enamel insulated wire, characterized in that it is equipped with an exhaust gas path 35 that accommodates a catalyst 32 and a part 33 of a pipe for blowing fresh air outside the furnace to be introduced into the air chamber 34.