JP3199499B2 - Method for removing residual oil from copper long coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently removing residual oil in a long coil of a copper tube used for an air conditioner or the like.

[0002]

2. Description of the Related Art Copper tubes used in heat exchangers such as air conditioners are usually formed into coil materials and then heated to soften them.
Annealing has been performed. Due to this heating and annealing, the processing oil remaining in the pipe was evaporated or decomposed and decreased to some extent.

However, in recent years, copper tubes have become smaller in diameter and longer in length with the downsizing of heat exchangers, and the amount of processing oil remaining in the tubes tends to increase. Due to environmental problems such as freonless, there has been a tendency to be omitted.

[0004] Furthermore, since the diameter and length of the copper tube make it difficult for the remaining oil in the tube to be discharged to the outside of the coil, it is necessary to send gas into the tube and forcibly discharge the remaining oil to the outside of the coil. It has become.

[0005] For this reason, conventionally, a coil has been heated while sending gas into a tube using a batch furnace to discharge residual oil in the tube.

[0006]

However, in the method using a batch furnace, the throughput of the coil is limited by the volume of the batch furnace. There is a drawback that an operation such as cooling is required, and the production efficiency is greatly reduced.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for efficiently removing residual oil in a copper long coil.

[0008]

Means for Solving the Problems In order to solve the above problems, the present inventors have intensively studied a method for efficiently removing residual oil in a pipe on the assumption that a continuous furnace is used instead of a batch furnace. Are the results of the present invention.

Accordingly, the present invention provides a feed coil for supplying gas connected to the copper tube length scale coil, while supplying gas while feeding the feed coil to the long long coil passes heating zone of the continuous furnace Discharging the oil in the pipe vaporized by heating out of the long coil by gas supply, cutting the feed coil after the long coil passes through the heating zone, and cutting off the feed coil in the pipe. The gist is an oil removal method.

Hereinafter, the present invention will be described in more detail.

[0011]

[Action]

In the method for removing residual oil in a long copper tube coil according to the present invention, first, the tip of a feed coil for supplying gas is connected to the end of the long copper tube coil. The connecting means may be any method. Further, the leading end of the feed coil may be connected to either the leading end or the trailing end of the long copper tube coil.

[0013] The long coil of the copper tube is conveyed into a continuous furnace by a feed roller. Accordingly, the connected feed coil is fed while being unwound at the position. The rear end of the feed coil is connected to a gas supply source, so that gas can be sent into the long copper tube coil via the feed coil. The gas is supplied into the long coil of the copper tube while being fed in accordance with.

The gas is supplied until the long copper tube coil passes through the heating zone of the continuous furnace. The residual oil in the copper tube long coil is decomposed or vaporized by heating, and is discharged outside the long coil by gas supply.

After the long coil of the copper tube has passed through the heating zone, the cooling zone for cooling the long coil of the copper tube enters the cooling zone. Is not so effective, and the supply of gas to the heating zone removes most of the residual oil in the pipe, so after the copper long coil passes through the heating zone, cut the feed coil at the furnace entrance. .

The remaining material of the feed coil connected to the long copper tube coil is passed through the continuous furnace while being connected to the long copper tube coil, and collected at the outlet of the continuous furnace.

As the gas to be supplied into the pipe, an appropriate gas can be used, but an inert gas such as N ₂ , CO ₂ , He, etc.
Alternatively, a gas containing an inert gas as a main component is preferable. In particular, in order to prevent the tube discoloration of the copper tube length scale coil, gas composition O ₂ concentration 2% or less, CO concentration 1 to 3%, H ₂ concentration of 3% or less, inert gas _2, such as balance N It is preferable to use a gas having a composition consisting of

When the next long copper tube coil is conveyed by the feed roller near the entrance of the continuous furnace, a feed coil is quickly connected to the end of this coil in the same manner, and gas is supplied in the same procedure as described above. What is necessary is just to let it pass through a continuous furnace while sending. By repeating this operation, heating and annealing of the long coil of the copper tube and accompanying removal of residual oil in the tube can be continuously performed.

It is preferable to use a copper tube as the feed coil, but a tube of another material may be used.

Next, an example of an apparatus used for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a state in which the end of the feed coil 2 is connected to the end of the long copper tube coil 1,
Schematically shows a state in which the feed roller 3 is carried into the continuous furnace by the feed roller 3. The feed coil 2 is rotatably supported at that position, and a gas can be supplied to the other end of the feed coil from a gas supply port.

FIG. 2 is a schematic diagram showing the arrangement of the feed coil 2 at the inlet of the continuous furnace. Each feed coil 2
Are arranged so as to be connected to the copper tube long coil 1 through the introduction roller 4 and the straightening roller 5, respectively. The reason why a plurality of feed coils 2 are arranged is that it is necessary to connect the feed coils 2 to the copper tube long coil 1 that is continuously conveyed.

FIG. 3 is a schematic diagram for explaining a method of heating and annealing the long coil 1 of the copper tube by a continuous furnace and removing residual oil in the tube. In the figure, a long copper tube coil 1 conveyed from the right side
Is connected to a feed coil 2 at its end, and moves in a continuous furnace while supplying gas into the coil. When the copper tube long coil 1 passes through the entrance vestible 6 and then passes through the heating zone 7, the feed coil 2 is cut at the position 10 and passed through the furnace as it is. Collect the material. Further, the feed coil 2 is connected to the next long copper tube coil, and the same operation is repeated.

Next, an embodiment of the present invention will be described.

[0025]

EXAMPLE 1 A feed coil of a 7 mm outer diameter, 0.35 mm thick phosphor deoxidized copper tube was connected to a long coil of a phosphorous deoxidized copper tube having an outer diameter of 7 mm and a thickness of 0.3 mm, The tube was passed through the continuous furnace at a feed rate of 270 mm / min while flowing N ₂ gas through the tube. In the heating zone, the furnace temperature was set so that the long coil reached approximately 600 ° C., N ₂ gas was fed through a feed coil until the long coil passed the heating zone, and after passing through the heating zone, the feed coil was cooled. Was cut off, and the remaining material of the feed coil was cut off from the long coil at the outlet of the furnace and collected. Table 1 shows the result of investigation of residual oil in the pipe of the long coil after the treatment.

[0026]

Example 2 In Example 1, the composition was such that the O ₂ concentration was 0.001%, the CO concentration was 25%, and the H ₂ concentration was 0.2 in the long coil tube.
The same operation was performed by flowing a gas consisting of 5% and the balance of N ₂ . Table 1 shows the result of investigation of residual oil in the pipe of the long coil after the treatment.

[0027]

Comparative Example 1 Using a batch furnace, annealing was performed at 600 ° C. while supplying an inert gas directly into a long coil of a copper tube. Table 1 shows the result of investigation of residual oil in the pipe of the long coil after the treatment.

[0028]

[Comparative Example 2] Using a continuous furnace, feeding long copper tube coil 2
It was conveyed into the furnace at a rate of 70 mm / min. At that time, annealing was performed at an annealing temperature of 600 ° C. without supplying gas to the long coil of the copper tube. Table 1 shows the result of investigation of residual oil in the pipe of the long coil after the treatment.

Table 1 shows the throughput of the copper long coil per hour and the amount of residual oil in the pipe (mg / m) per hour. As is clear from the above, according to the method of the present invention, the residual oil in the pipe can be efficiently removed, and the continuous furnace is used, so that the amount of the long coil processed in the copper pipe per unit time is large.

[0030]

[Table 1]

[0031]

As described in detail above, according to the present invention,
The residual oil in the copper long coil can be significantly reduced without lowering the production efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a connection state between a long copper tube coil and a feed coil, and a state in which a long copper tube coil is carried into a continuous furnace.

FIG. 2 is a schematic diagram showing an arrangement of feed coils at a continuous furnace inlet.

FIG. 3 is a schematic diagram illustrating a method of heating and annealing a long coil of a copper tube and removing residual oil in the tube by a continuous furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Copper coil long coil 2 Feed coil 3 Feed roller 4 Introducing roller 5 Straightening roller 6 Inlet vestible of continuous furnace 7 Continuous furnace heating zone 8 Continuous furnace cooling zone 9 Outlet vestible of continuous furnace 10 Cutting position

Claims (4)

(57) [Claims] 1. A feed coil supplying the gas connected to the copper tube length scale coil, while supplying gas while feeding the feed coil to the long long coil passes heating zone of the continuous furnace, vaporized by heating A method for removing residual oil in a copper long coil, wherein the oil in the pipe is discharged outside the long coil by gas supply, and the feed coil is cut after the long coil passes through a heating zone. 2. The gas fed into the long coil tube is N
_2, CO ₂ or method according to claim 1, characterized in that an inert gas He. 3. The gas fed into the tube of the long coil is O
₂ concentration 2%, CO concentration 1 to 3%, H ₂ concentration of 3% or less,
_2. The method according to claim 1, wherein the balance consists of an inert gas such as N2. 4. The method according to claim 1, wherein a copper tube is used for the feed coil.