JPS6242708B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous furnace brazing method in which a workpiece is conveyed by a belt conveyor, heated, brazed, and further cooled.

Generally, in a continuous type brazing furnace, a modified gas such as propane or butane or decomposed ammonia gas is introduced into the furnace as an atmospheric gas to create a non-oxidizing atmosphere in the furnace for brazing. ing.

In addition, the atmospheric gas produced by the conversion furnace is
In order to remove moisture, the material is first cooled to below 10 degrees Celsius in a refrigerator and then placed directly into the heating section of the furnace. Therefore, low-temperature atmospheric gas is used in a heating furnace, for example in a copper brazing furnace, at a temperature of 1100
The temperature will be raised above ℃. In order to raise the temperature of the low-temperature atmospheric gas to such a temperature, more than 300 kcal of energy is required per 1 m ³ of the atmospheric gas. Therefore, generally about 100m ³ /hr of atmospheric gas is supplied into the heating section, so
30,000 kcal of energy is consumed to raise the temperature of the atmospheric gas, and a large amount of energy that is not directly involved in brazing is used.

Furthermore, the atmospheric gas contains combustible components such as H ₂ or CO, and the metamorphosed gas that has passed through the brazing furnace and contributed to the reduction of the workpiece is burned and released from the furnace. If 100 m ³ of gas is released per hour, 60,000 kcal of energy will be released without being used effectively.

The purpose of the present invention is to provide a continuous type brazing furnace that can effectively utilize energy by eliminating as much as possible the wasteful use of energy in the conventional brazing furnace, and has achieved this object. In order to achieve this, the present invention provides a suction section for atmospheric gas near the outside of at least one of the workpiece inlet or outlet of a continuous brazing furnace, and provides a suction section for the atmospheric gas in the exhaust duct connected to this suction section. The gist of this is that a supply pipe was installed to supply atmospheric gas into the unit.

An example of the implementation of the present invention will be explained in detail below based on the accompanying drawings.

Fig. 1 is a side sectional view of a continuous brazing furnace for carrying out the method of the present invention, and Fig. 2 is a plan view of the cooling section of the brazing furnace. A front table 2 is arranged at the upstream end, and a work entry port 3 is formed on the front table 2. Then, the preheating section 4 is connected to the front table 2.
The preheating section 4 is provided with heaters 5a for raising the temperature of the workpiece to a certain extent. Then, a heating section 6 is arranged continuously to the preheating section 4,
Heaters 5b for raising the temperature of the workpiece to a brazing treatment temperature, for example, 1100° C. or higher in the case of copper brazing, are also provided within the heating section 6. Also,
A slow cooling section 7 is disposed downstream of the heating section 6, and a cooling section 8 is further downstream of the slow cooling section 7.

A water jacket 9 is formed on the walls constituting the slow cooling section 7 and the cooling section 8.
Four cooling fans 10a, 10b, 10c, and 10d are installed on the ceiling of the workpiece along the transport direction of the workpiece. These cooling fans 10a, 10b, 1
0c and 10d are rotated by motors 11a and 11b fixed to the outer wall of the cooling section 8 as shown in FIG.
0d is rotated by the motor 11b,
Since the rotation directions of the respective motors 11a, 11b are reversed, the cooling fans 10a, 10b, 10
The rotation directions of c and 10d are alternately reversed, so that the atmospheric gas in the cooling part 8 swirls and circulates in the cooling part 8, increasing the cooling effect and not disturbing the atmospheric gas in the heating part 6. It also prevents outside air from being drawn in. In addition, each cooling fan 10a, 10
The rotation directions of cooling fans 10a, 10c and cooling fans 10b, 10 are made the same.
Even if the direction of the blade d is reversed, the same swirling flow as described above can be obtained.

Further, a rear table 12 is arranged continuously to the cooling section 8, and a workpiece export port 13 is formed on the rear table 12.

Further, rollers 14 and 15 are provided outside the workpiece inlet 3 and outlet 13 of the furnace 1, respectively, and a mesh belt 16 is installed between the rollers 14 and 15.
A workpiece is placed on the mesh belt 16, and as the mesh belt 16 moves, the workpiece is sequentially sent to the preheating section 4, the heating section 6, the slow cooling section 7, and the cooling section 8.

Furthermore, suction parts 17 and 18 are provided near the outside of the furnace at the workpiece loading port 3 and the unloading port 13, and the suction parts 1
Exhaust ducts 19 and 20 are connected to 7 and 18, and these exhaust ducts 19 and 20 are merged in the middle to form one exhaust duct 21, and the high temperature atmospheric gas flowing out from the carry-in port 3 and the carry-out port 13 is sucked and discharged. I try to do that. This sucked atmospheric gas is _H2 ,
Since it contains flammable components such as CO, it will burn when it comes into contact with outside air at the suction part.

On the other hand, a metamorphic gas generator 22 is installed near the furnace 1, and the metamorphic gas generated by the metamorphic gas generator 22 is introduced into a cooling device 23 attached to the device 22, where it is cooled to below 10°C and moisture is removed. This is then supplied into the furnace 1 as an atmospheric gas. That is, an atmospheric gas supply pipe 24 is led out from the cooling device 23, and this supply pipe 24 is branched in the middle, and one pipe 25 is extended as it is to the vicinity of the cooling section 8, where it is branched into four pipes. The pipe 25a... is connected to the cooling fan 10
They are inserted into introduction holes 26 . The other pipe 27 passes through the merged exhaust duct 21 and extends to near the preheating section 4 heating section 6, and branches into two pipes 28 and 29.
is inserted into an introduction hole 30 formed in the ceiling of the preheating section 4, and the other pipe 29 is inserted into an introduction hole 31 formed in the ceiling of the heating section 6.

Therefore, the atmospheric gas supplied to the heating section 6 or the preheating section 4 has a temperature of about 500°C in the exhaust duct 21.
After being heated to , it is supplied into the preheating section 4 and the heating section 6. Of course, the pipe 27 may be provided within the exhaust ducts 19 and 20.

Therefore, if the temperature of the heating section 6 is 1100°C, for example, whereas conventionally it was necessary to raise the temperature of the atmospheric gas by 1000°C or more, it is only necessary to raise the temperature by about 600°C, and the temperature of ^100m3 /hour is increased. If propane converted gas is supplied as atmospheric gas, approximately
This means that 15,000 kcal of energy can be saved.

As is clear from the above description, according to the present invention, in a continuous type brazing furnace, a suction section is provided near the outside of the furnace at least on one of the workpiece inlet and outlet, and the workpiece is supplied into the furnace. The metamorphic gas is sucked outside the furnace, the metamorphic gas is brought into contact with the outside air, the combustible components in the metamorphic gas are combusted to a high temperature, and atmospheric gas is supplied into the heating furnace into the exhaust duct connected to this suction section. Since we have installed a supply pipe for
Conventionally, the heat of the used atmospheric gas, which was released as is, is used to raise the temperature of the low-temperature atmospheric gas that is being supplied, which allows for effective use of energy and has many benefits, including cost reduction. Demonstrate.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention,
FIG. 1 is a side sectional view of a continuous brazing furnace according to the present invention, and FIG. 2 is a plan view of a cooling section of the brazing furnace. In the drawing, 1 is a continuous brazing furnace, 3 is a workpiece loading port, 6 is a heating section, 13 is a workpiece loading port, 17 and 18 are atmospheric gas suction sections, 19 and 2
0 and 21 are exhaust ducts, 22 is a modified gas generator, 23 is a cooling device, and 27 is a supply pipe.

Claims (1)

[Claims] 1. In a continuous furnace brazing method in which the modified gas generated in the modified gas generator is passed through a cooling device to remove moisture and then introduced into the furnace, a part of the modified gas drawn out from the cooling device is The remaining part was introduced into the heating part of the brazing furnace and the remaining part was introduced into the cooling part of the brazing furnace, and the metamorphosed gas discharged from the brazing furnace was brought into contact with the outside air and combusted, and the combustion became high temperature. Heat exchange is performed between the exhaust gas and the transformed gas flowing from the cooling device to the heating section of the brazing furnace to raise the temperature of the transformed gas, and the temperature of the transformed gas flowing from the cooling device to the cooling section of the brazing furnace remains unchanged. A continuous furnace brazing method characterized in that it is introduced in.