JPH06256855A - Heat treatment apparatus for pipe coil and method for removing oil from pipe coil - Google Patents

Abstract

PURPOSE:To simply, easily and perfectly remove oil in the inner surface of a pipe by heating a long metallic pipe coil in a heating furnace and passing gas through the pipe in the condition of vaporizing the stuck oil to the inner surface of the pipe. CONSTITUTION:The metallic pipe coil 16 such as Al pipe, Cu pipe, etc., is carried into a heating chamber 7 in a continuous annealing furnace 1 for annealing. The atmosphere in the chamber is heated by a heating source in the heating chamber 7 and working of a circulating fan 13. By heating the metallic coil 16, the oil stuck to the outer surface of the metallic pipe is vaporized and removed, and also the oil stuck to the inner surface of the metallic pipe is vaporized to make the oil gaseous state. Successively, from the inlet side of the metallic pipe forming the coil 16, the high temp. air in the case of the Al pipe or the high temp. gas such as gaseous nitrogen, etc., in the case of the Cu pipe is blown in the metallic pipe and the oil vaporized as the gas is discharged to the outside of the pipe. After vaporizing, gasifying and removing the stuck oil to the inner and the outer surfaces of the metallic pipe coil 16, this metallic pipe coil is carried in the cooling chamber 8 and cooled, and the annealing is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for heating a pipe coil and subjecting it to heat treatment, and more particularly to an apparatus for removing oil adhering to the inside of a pipe in a pipe coil and a method for removing the oil. Regarding

[0002]

2. Description of the Related Art A so-called pipe coil, in which a long metal thin pipe is wound in a coil shape, has oil, for example, rolling oil, attached thereto in the process of manufacturing the pipe coil. When such a pipe coil is heat-treated, for example, brightly annealed, the oil on the outer surface can be removed by evaporation by heating, but the oil inside the pipe is not discharged outside and remains there. Therefore, conventionally, for example, prior to heat treatment of the pipe coil, a gas for oil discharge is sent from one end into the pipe of the pipe coil, and the above-mentioned work is performed while vaporizing the oil in the pipe and discharging it from the other end of the pipe. I am doing it.

[0003]

In this conventional working method, since the length of the pipe in the pipe coil is extremely long, for example, several thousand meters, it takes a very long time to vaporize and discharge the oil in the entire inside thereof. There is a problem. If it is cut up in a short time, oil remains inside the pipe, and when the user of the product pipe puts the contents, for example, the cooling medium of the air conditioner in the pipe, it contaminates the contents. There was a problem that would end up.

The present invention has been made to solve the above-mentioned problems (technical problems) of the prior art. In the heating process of heat treatment of a pipe coil, the oil inside the pipe is evaporated and the pipe is By sending a gas for oil discharge at a temperature sufficient to maintain the evaporation state of oil, the oil in the pipe can be discharged almost completely, and the work can be done in a short time. An object of the present invention is to provide a pipe coil heat treatment apparatus and a pipe coil oil removal method that enable efficient oil removal work by utilizing a small part of the heat treatment process of the pipe coil.

[0005]

To achieve the above object, a heat treatment apparatus for a pipe coil according to the present invention includes a pipe having a heat source for heating the pipe coil inside a furnace having a space for accommodating the pipe coil. In a coil heat treatment apparatus, an air supply means for sending out a gas for oil discharge having a temperature sufficient to maintain the evaporation state of oil adhering to the inside of the pipe of the pipe coil, the air supply means and the pipe in the furnace. The coil is provided with a communication means for communicating with one end of the pipe.

In the method for removing oil from a pipe coil according to the present invention, the pipe coil is heated in the furnace to a temperature equal to or higher than the evaporation temperature of the oil adhering to the pipe in the pipe coil, and the oil is evaporated. A gas for oil discharge having a temperature sufficient to maintain the evaporated state of oil is sent to one end of the pipe in the pipe coil, and the evaporated oil in the pipe is discharged from the other end of the pipe to the outside of the pipe.

[0007]

[Function] The pipe coil is heated in the furnace. The heating evaporates the oil adhering to the inside of the pipe. In this state, a gas for oil discharge having a temperature sufficient to maintain the evaporated state of oil is fed into the pipe from one end thereof. Due to the feeding, the oil evaporated in the pipe is discharged from the other end of the pipe in the evaporated state.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a continuous annealing furnace as an example of a heat treatment device for pipe coils. Explaining the annealing furnace, 2 is a furnace, which has an inlet 3 at one end and an outlet 5 at the other end and is provided with openable doors 4 and 6, respectively. Reference numeral 7 is a heating chamber in the furnace, and 8 is a cooling chamber, and the inside of each is a storage space capable of storing one pipe coil.
A partition wall 9 separates the both. A communication port 10 is provided in the partition wall 9, and has a door 11 that can be opened and closed. 12 is a roller for conveyance, which is provided over the entire area of the heating chamber and the cooling chamber. Reference numeral 13 denotes a known circulation fan for circulating a gas for heat treatment. Although not shown, the heating chamber 7 is provided with a heat source, such as a burner or a radiant tube, for heating the gas in the heating chamber 7 as a heat source for heating the pipe coil. Further, the cooling chamber 8 is equipped with cooling means for cooling the gas therein.

Next, FIG. 2 showing a mechanism for removing oil provided in the heating chamber 7 will be described. Reference numeral 20 denotes an air supply means. Reference numeral 21 denotes an air supply pipe of the air supply means 20, which is provided with a holder 22 attached to the furnace body 2 so as to freely move back and forth in the arrow direction. Reference numeral 23 denotes an air supply port member (connecting metal fitting) attached to the end of the air supply pipe 21 on the inner side of the furnace, which has an opening at the center, and the opening communicates with the hollow part of the air supply pipe 21. Reference numeral 24 denotes an advancing / retreating device for advancing / retreating the air supply pipe 21. For example, an air cylinder is used, and its piston rod 24a is connected to the air supply pipe 21 via a connector 25. 26 is a compressor for pressurizing the gas for oil discharge. 27 is a surge tank for storing the pressurized gas. Reference numerals 28 and 29 denote connecting pipes, and 30 denotes a connecting flexible pipe. The compressor 26, the surge tank 27, and the air supply pipe 21 are connected to each other through these pipes. A pressure switch 31 is for automatically controlling the operation of the compressor 26 so that the gas pressure in the surge tank 27 becomes constant. Reference numeral 32 is a solenoid valve for controlling the supply of gas to the air supply port member 23 and its stop.

Next, 37 is a communication means provided in the tray 15 for communicating the air supply means 20 with one end of the pipe coil 16 on the tray 15. Reference numeral 33 denotes an inlet member of the means, which is attached to the support bracket 34 attached to the tray 15 at the same height as the air supply port member 23, and the opening of the air supply port member 23 is provided at the center thereof. There is an opening facing the section. Reference numeral 35 denotes a connecting pipe, one end of which is connected to the opening of the receiving member 33. Reference numeral 36 denotes a coupling provided at the other end of the connecting pipe 35, and one end 16a of the pipe coil 16 placed on the tray 15 can be detachably connected thereto.

Next, the annealing of the pipe coil 16 by the annealing furnace 1 having the above structure will be described. The pipe coil 16 is first carried into the heating chamber 7 by the roller 12 while being placed on the tray 15. The inner diameter of the pipe in the pipe coil 16 is, for example, 6 to 8 to 15 mm, and the wall thickness is, for example, 1 mm.
It is a degree. Further, the material thereof may be a body, aluminum, or other material. Pipe coil 16
When is transferred into the heating chamber 7, the advancing / retreating device 24 operates to move the air supply port member 23 toward the receiving member 33 via the air supply pipe 21 and press-contact it. As a result, the hollow part of the air supply port member 23 and the hollow part of the receiving port member 33 are in communication with each other. In this state, the pipe coil 16 is heated by the atmosphere gas in the furnace by the operation of the heat source in the heating chamber 7 and the circulation fan 13. The temperature of the atmosphere gas in the furnace is, for example, 4
It is 50 ° C. The heating of the pipe coil 16 as described above is continued for a predetermined time, and the pipe coil 16 rises to a predetermined high temperature for annealing. By the temperature rise of the pipe coil 16, the oil (for example, rolling oil) adhering to the inside of the pipe in the pipe coil 16 evaporates and becomes a gas state. The oil is generally 100 to 400 ° C. Therefore, in the state where the pipe coil 16 is heated to a predetermined high temperature as described above, all the oil in the pipe is evaporated and is in a gas state. When the temperature rising process of the pipe coil as described above approaches the end, the oil removal operation in the pipe is performed.

The oil removing operation is performed as follows. In the surge tank 27, a gas for oil discharge, which is supplied from a gas supply source (not shown) and is pressurized by the compressor 26, is stored in advance. As a gas for discharging oil, a gas that does not adversely affect the pipe in a heated state, for example, air is used when the pipe is made of aluminum, and a non-oxidizing gas such as nitrogen is used when the pipe is made of a cylinder or the like. The temperature of the gas in the tank 27 may be room temperature. When the heating process of the pipe coil 16 approaches the final stage as described above, the solenoid valve 32 is opened and the surge tank 27
The oil discharge gas therein is sent from the air supply port member 23 through the receiving member 33 to the one end 16a of the pipe in the pipe coil 16. Due to the feeding of such a high temperature gas, the oil vaporized in the pipe to become a gas is pushed by the fed gas, and the vaporized state of the pipe in the pipe coil 16 is maintained. It flows out from the other end. The feeding of the oil discharge gas as described above is continued for a sufficient time so that all the oil vaporized in the pipe to be gas is discharged from the pipe. The time varies depending on the length of the pipe in the pipe coil 16, but is, for example, several seconds to tens of minutes. When the oil discharge is completed as described above, the solenoid valve 32 is closed again, and the supply of the oil discharge gas is stopped. After that, the air supply port member 23 is retracted, and then the pipe coil 16 in the heating chamber 7 is moved to the roller 1
By the operation of No. 2, it is conveyed to the cooling chamber 8, where the cooling for annealing as well known is performed, and after completion of cooling, it is sent out from the outlet 5.

Next, different embodiments will be described.
Since the oil discharge in the pipe due to the feeding of the oil discharge gas as described above is completed in a short time and has no influence on the heating cycle of the pipe coil, the pipe coil 1 in the heating chamber 7
It may be performed after a predetermined heating time of 6 has elapsed. Further, such oil discharge by feeding the oil discharge gas may be carried out when all the oil in the pipe is evaporated, and therefore may be carried out in the middle of the heating step. The temperature of the gas sent from the air supply means 20 to the pipe may be room temperature below the evaporation temperature of the oil in the following cases. That is, if the temperature of the oil in the vaporized state or the temperature of the pipe is sufficiently high, or if the temperature of the gas to be fed is lower than the above-mentioned vaporization temperature, even if the gas below the vaporization temperature is fed in, the beginning of that gas The gas that comes into contact with or mixes with the oil in the vaporized state at the portion immediately reaches the vaporization temperature or higher, and the vaporized state of the oil is maintained. Therefore, the temperature of the gas may be equal to or lower than the evaporation temperature of the oil and may be a room temperature.

Next, as another embodiment relating to the structure of the annealing furnace 1, both the heating chamber 7 and the cooling chamber 8 may be arranged so that a plurality of pipe coils can be arranged side by side in a column. Further, the heating chamber 7 and the cooling chamber 8 may be provided in a plurality of chambers in a column shape so that the heating and cooling steps are divided into a plurality of steps. Furthermore, the well-known front chamber may be provided in front of the heating chamber 7, and the well-known rear chamber may be added after the cooling chamber 8. Furthermore, even if the annealing furnace is not a continuous processing furnace having the above-mentioned configuration, but a furnace configured to perform a batch-type processing, a mechanism for removing oil as shown in FIG. 2 is used in the furnace. Alternatively, the oil may be removed in the same process as described above. Needless to say, better bright annealing can be performed if the pipe coil to be processed is previously purged with a predetermined gas.

[0015]

As described above, according to the present invention, it is of course possible to heat the pipe coil 16 and heat-treat it, and also to remove oil adhering to the inside of the pipe of the pipe coil 16. In the heating process, after the temperature of the pipe coil 16 rises to evaporate the oil inside, the gas for oil discharge having a temperature sufficient to maintain the evaporation state of the oil is fed into the pipe to It has the feature that the oil can be discharged from the pipe in the vaporized state.

[0016] This means that the oil inside the pipe can be sufficiently discharged, and the inside of the pipe can be cleaned to a very high degree.

Not only that, the fact that the oil can be discharged in the vaporized state as described above allows the oil to be discharged very smoothly, and the discharge can be completed in a very short time. There is an effect that can be done. Therefore, even if oil removal work is performed in the process of heating the pipe coil, it does not have any adverse effect on the heating cycle, and it is extremely efficient by utilizing a small part of the process of heat treatment of the pipe coil. It is effective in removing oil.

[Brief description of drawings]

FIG. 1 is a schematic view of a continuous annealing furnace.

FIG. 2 is a vertical sectional view of a heating chamber.

[Explanation of symbols]

 2 furnace 16 pipe coil 20 air supply means 37 communication means

[Procedure amendment]

[Submission date] April 9, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art A so-called pipe coil, in which a long metal thin pipe is wound in a coil shape, has oil, for example, rolling oil, attached thereto in the process of manufacturing the pipe coil. If the heat treatment for example bright sintered blunt such pipe coil, but the oil of the outer surface can by connexion removed evaporation by heating, the oil inside the pipe may remain there for a not discharged to the outside. Therefore, conventionally, for example, prior to heat treatment of the pipe coil, a gas for oil discharge is sent from one end into the pipe of the pipe coil, and the above-mentioned work is performed while vaporizing the oil in the pipe and discharging it from the other end of the pipe. I am doing it.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In Figure 1, 1 indicates a continuous sintered blunt furnace as an example of a heat treatment apparatus of the pipe coil. Referring to the sintered blunt furnace, 2 is a furnace, at one end has an outlet 5 at the other end of the inlet 3, respectively openable door 4, 6 are provided. Reference numeral 7 is a heating chamber in the furnace, and 8 is a cooling chamber, and the inside of each is a storage space capable of storing one pipe coil.
A partition wall 9 separates the both. A communication port 10 is provided in the partition wall 9, and has a door 11 that can be opened and closed. 12 is a roller for conveyance, which is provided over the entire area of the heating chamber and the cooling chamber. Reference numeral 13 denotes a known circulation fan for circulating a gas for heat treatment. Although not shown, the heating chamber 7 is provided with a heat source, such as a burner or a radiant tube, for heating the gas in the heating chamber 7 as a heat source for heating the pipe coil. Further, the cooling chamber 8 is equipped with cooling means for cooling the gas therein.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Next, the annealing of the pipe coil 16 by the annealing furnace 1 having the above structure will be described. The pipe coil 16 is first carried into the heating chamber 7 by the roller 12 while being placed on the tray 15. The inner diameter of the pipe in the pipe coil 16 is, for example, 6 to 8 to 15 mm, and the wall thickness is, for example, 1 mm.
It is a degree. Also the material is those things or other material made of copper-made objects or aluminum. Pipe coil 16
When is transferred into the heating chamber 7, the advancing / retreating device 24 operates to move the air supply port member 23 toward the receiving member 33 through the air supply pipe 21 and press-contact it. As a result, the hollow part of the air supply port member 23 and the hollow part of the receiving port member 33 are in communication with each other. In this state, the pipe coil 16 is heated by the atmosphere gas in the furnace by the operation of the heat source in the heating chamber 7 and the circulation fan 13. The temperature of the atmosphere gas in the furnace is, for example, 4
It is 50 ° C. The heating of the pipe coil 16 as described above is continued for a predetermined time, and the pipe coil 16 rises to a predetermined high temperature for annealing. By the temperature rise of the pipe coil 16, the oil (for example, rolling oil) adhering to the inside of the pipe in the pipe coil 16 evaporates and becomes a gas state. The evaporation temperature of the oil is generally 100 to 400 ° C. Therefore, in the state where the pipe coil 16 is heated to a predetermined high temperature as described above, all the oil in the pipe is evaporated and is in a gas state. When the temperature rising process of the pipe coil as described above approaches the end, the oil removal operation in the pipe is performed.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

The oil removing operation is performed as follows. In the surge tank 27, a gas for oil discharge, which is supplied from a gas supply source (not shown) and is pressurized by the compressor 26, is stored in advance. The gas for oil discharge gas, not adversely affect the pipe heated state, for example when the pipe is made of aluminum air, non-oxidizing gas, such as copper made other nitrogen in the case of used. The temperature of the gas in the tank 27 may be room temperature. When the heating process of the pipe coil 16 approaches the final stage as described above, the solenoid valve 32 is opened and the surge tank 27
The oil discharge gas therein is sent from the air supply port member 23 through the receiving member 33 to the one end 16a of the pipe in the pipe coil 16. Due to the feeding of such a high temperature gas, the oil vaporized in the pipe to become a gas is pushed by the fed gas, and the vaporized state of the pipe in the pipe coil 16 is maintained. It flows out from the other end. The feeding of the oil discharge gas as described above is continued for a sufficient time so that all the oil vaporized in the pipe to be gas is discharged from the pipe. The time varies depending on the length of the pipe in the pipe coil 16, but is, for example, several seconds to tens of minutes. When the oil discharge is completed as described above, the solenoid valve 32 is closed again, and the supply of the oil discharge gas is stopped. After that, the air supply port member 23 is retracted, and then the pipe coil 16 in the heating chamber 7 is moved to the roller 1
By the operation of No. 2, it is conveyed to the cooling chamber 8, where the cooling for annealing as well known is performed, and after completion of cooling, it is sent out from the outlet 5.

Claims (2)

[Claims] 1. In a pipe coil heat treatment apparatus having a heat source for heating a pipe coil inside a furnace having a space for accommodating the pipe coil, the evaporation state of oil adhering to the inside of the pipe of the pipe coil is adjusted. A pipe comprising an air supply means for sending out a gas for oil discharge having a temperature sufficient to hold it, and a communication means for connecting the air supply means with one end of the pipe in the pipe coil in the furnace. Coil heat treatment equipment. 2. A temperature sufficient to maintain the evaporation state of the oil after heating the pipe coil in the furnace to a temperature equal to or higher than the evaporation temperature of the oil adhering to the pipe in the pipe coil and evaporating the oil. A method for removing oil from a pipe coil, wherein the oil discharging gas is sent to one end of the pipe in the pipe coil, and the oil in the evaporated state inside the pipe is discharged from the other end of the pipe to the outside of the pipe.