JP2010235234A - Level wound coil and package thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a level wound coil and a package thereof which cause none of bending, deformation, and scratch of a tube during uncoiling by ETS method, and which achieve a smooth unwinding and cause no discoloration even when the mass of LWC is large, a plurality of LWCs are stacked one upon another, and the number of winding layers of LWC and the number of windings per layer are large. <P>SOLUTION: A copper or copper alloy tube constituting the level wound coil is a post-annealed one whose external surface is coated with oil containing silicone oil. According to an analysis by high-frequency glow discharge atomic emission spectrometry, the maximum value of Si concentration in a surface layer extended 20 nm from the surface of the copper or copper alloy tube is 0.3-30 atom%. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat transfer tube of an air conditioner refrigerator such as an air conditioner, a level wound coil such as a copper or copper alloy tube used for a hot water supply / water supply pipe for a building, etc., and a package of this level wound coil, The present invention relates to a level wound coil that is unwound by an ETS (Eye To the Sky) method (registered trademark).

  Copper or copper alloy pipes (hereinafter simply referred to as copper pipes) include heat transfer pipes for air conditioners such as air conditioners (inner grooved pipes and smooth pipes), hot water supply pipes and drainage for construction Used for piping. In the manufacturing process, for example, this copper tube is wound into a coil and then annealed to be tempered to a predetermined material, stored in a LWC (Level Wound Coil) state, and transported. Is done.

  FIG. 11 is a cross-sectional view showing a conventional method for winding a level-wound coil, FIG. 12 is a perspective view showing a vertical uncoiler that winds and unwinds this LWC, and FIG. 13 shows this LWC. It is a perspective view which shows the horizontal decoiler which winds and unwinds. The vertical uncoiler (rotating device) 103 shown in FIG. 12 has a rotating shaft extending in the horizontal direction, and the horizontal uncoiler (rotating device) 104 shown in FIG. 13 has a rotating shaft extending in the vertical direction. However, in FIG. 11, the cross section of the pipe | tube 101 is shown with a circle | round | yen for the simplification of illustration. As shown in FIGS. 12 and 13, a bobbin 102 composed of a removable inner cylinder 102a and a side plate 102b is attached to a rotating device (uncoiler) 103 or 104 with its axial direction horizontal or vertical, and this rotation The bobbins 102 are rotationally driven by the devices 103 and 104 in the direction indicated by the arrow of the rotation direction (winding). As a result, the copper tube 101 is wound around the bobbin 102.

  In this case, as shown in FIG. 11, the copper tube 101 is first wound around the outer peripheral surface of the inner cylinder 102 a of the bobbin 102 in the right direction in the figure with the left end position in the figure as the start end 111. This aligned winding means that the copper tube 101 is wound closely so that one turn of the copper tube 101 and one adjacent turn are in contact with each other, that is, no gap is formed. Next, after the copper tube 101 comes to the right end and winding of the first layer is completed, this time, the second layer is wound from the right end toward the left end. Conventionally, the copper tube portion 112 serving as the winding start end of the second layer is located on the gap between the copper tube portion of the final winding of the first layer and the side plate 102b, and sequentially toward the left, The second-layer copper tube portion is wound so as to fit into a recess formed between adjacent copper tube portions in the coil.

  Thereafter, the third layer coil is laminated on the second layer coil. In this way, after the copper tube 101 is wound in the axial direction of the inner cylinder 102a of the bobbin 102, a single layer coil is formed in a cylindrical shape, and then the copper tube 101 is wound thereon to form a cylindrical coil. The winding method to be formed is called traverse winding. Conventionally, the number of turns of the traversed coil is the same in each layer. By winding the copper tube 101 in this way, the coil 110 having a smaller volume than the length of the copper tube 101 can be manufactured, and the space required for storage and transportation of the copper tube 101 can be reduced. It becomes. The mass of the LWC 110 is 100 to 500 kg per coil.

  The LWC produced in this manner is subjected to a debonding treatment with a copper band or the like on the outermost periphery, if necessary, and then the bobbin 102 is removed, for example, charged into a roller hearth type continuous annealing furnace, Annealing so that a predetermined tempering is performed.

  When transporting the LWC 110 thus annealed, for example, the bobbin 102 is mounted again, or the LWC 110 is placed on the pallet with its coil axis perpendicular to the LWC 110 alone. In this case, there are cases where only one coil is placed on the pallet, and cases where a plurality of coils are stacked and placed with a cushioning material interposed between the coils. In addition, the outer surface is covered with corrugated cardboard etc. so that it does not collapse or hit due to impact during transportation, and support pillars are set up at the four corners of the pallet or the center of each side of the pallet, and the coil is used as a support. In a fixed state, it is transported to a copper pipe usage destination such as an air conditioner assembly factory (see, for example, Patent Documents 1 to 4). FIG. 14A is a diagram showing an example of the LWC 110 at the time of transportation, and FIG. 14B is a diagram showing an example of the LWC 110 at the use destination. At the time of transportation, as shown in FIG. 14A, the LWC 110 has a bobbin 102 removed, for example, and is fixed with a copper band 106 so that the winding state does not collapse. As shown, a liner 105 made of cardboard is interposed.

  In this manner, the LWC that has been transported to the user is unpacked, and the LWC 110 is mounted on the rotating shafts of the rotating devices 103 and 104 as shown in FIGS. That is, after unpacking the LWC 110, as shown in FIG. 14B, the inner cylinder 102a is inserted into the center of the LWC 110 one coil at a time, and the side plate 102b is fixed to the inner cylinder 102a with screws or the like. 102 is assembled. However, when transported with the bobbin 102 attached, assembly is not necessary. The LWC 110 is mounted on the rotating devices 103 and 104 while being wound around the bobbin 102. Then, the rotating shafts of these rotating devices 103 and 104 are rotationally driven in the direction indicated by the arrow in the direction of rotation (unwinding), and the terminal 113 of the copper tube portion at the time of winding the coil shown in FIG. By pulling out, the coil 110 is unwound from the outer peripheral side.

  Such a conventional LWC has the following problems. That is, during transportation and storage, the outer surface of the copper tube wound around the central portion of the coil in the stacking direction may be discolored. That is, such discoloration is not recognized in the appearance of the coil, but when the coil is uncoiled (unrolled), a discolored portion appears. This discoloration occurs due to the formation of an oxide film and is called anko discoloration. If such a discoloration occurs in the copper tube, the reliability when brazing the copper tube may be lowered, and the appearance is not preferable, so it cannot be used and is discarded. In particular, in a hot and humid place such as a warehouse in the summer, or in an environment where the temperature and / or humidity varies significantly throughout the day, the surface of the copper tube is likely to be denatured and hydrophilized, so that anko discoloration is likely to occur. This leads to a decrease in yield and productivity.

  Moreover, the operation | work which mounts a coil to a rotating apparatus is required. In this case, since the mass of the LWC is large, it is necessary to pay sufficient attention to ensure safety and prevent deformation of the coil, which causes a reduction in work efficiency.

  Further, when the coil 110 is unwound using the rotating device 103 shown in FIG. 12 with its coil axis horizontal, if the pulling force of the copper tube 101 is large, the coil 110 is wound. As a result of this tightening, the copper tube portion adjacent to the side plate 102b enters the gap between the side plate 102b and the copper tube 101, and it is difficult for the copper tube portion to come off, and this portion often deforms, resulting in increased yield and productivity. It is a factor to decrease. Further, in the rotating device 103 shown in FIG. 12, it is necessary to support the coil in a cantilever state with a horizontal rotating shaft, and to rotate the rotating shaft to feed out the copper tube, which is complicated in structure. The device cost is high.

  Further, when the rotating device 104 shown in FIG. 13 is used to unwind the coil 110 from the outer surface side of the coil with the coil axis vertical, there is a force in the direction of winding the coil by the tension acting on the copper tube 101. Works. For this reason, the copper pipes 101 are rubbed against each other to cause rubbing or deformation, which is a factor in reducing yield and productivity.

  As shown in FIG. 13, when the LWC 110 is uncoiled with its coil axis vertical, a turntable 107 for mounting the LWC 110 is required. For this reason, the rotating device 104 shown in FIG. 13 also has a drawback that the device cost is high.

  As described above, conventionally, the uncoil of the LWC 110 requires a large investment for introducing the device. In particular, if the tension of the unwinding tube is to be controlled to be constant, in the rotating device including the turntable, it is necessary to control the rotation speed of the turntable in a complicated manner, and the device cost becomes extremely high.

  In order to solve such problems, a coil unwinding method called ETS (Eye To the Sky) has been proposed. FIG. 10 is a perspective view showing an uncoil method by the ETS method.

In this method, as shown in FIG. 10, if the bobbin is mounted on the LWC 110 during transportation, the inner cylinder and the side plate of the bobbin are removed. Placed on. At this time, the LWC 110 is arranged such that its coil axis is vertical and the starting end 111 at the time of coil winding existing on the coil inner surface side is on the upper side as shown in FIG. Then, the copper pipe starting end 111 is pulled up when the coil is wound, and the copper pipe 101 is inserted into a curved cylindrical guide 115 installed above the base 114 to change the course of the copper pipe 101. To supply. Thus, the copper tube 101 is pulled out from the coil 110 without rotating the coil 110, and the coil 110 is sequentially unwound from the inner surface side. Further, the copper tube 101 immediately after being pulled out from the coil 110 forms a loop in a spiral shape, but the winding flaw is gradually eliminated while being pulled out through the guide 115. In addition, since plastic processing is added to the copper tube by unwinding, for example, when the copper tube is a soft material, the 0.2% proof stress is increased by about 30 to 40 N / mm ² compared to before unwinding.

  In this way, when uncoiling by the ETS method, in order to save the trouble of removing the inner cylinder and side plate from the LWC before uncoiling, a plurality of LWCs are usually placed on a pallet without a bobbin and transported for use. The package is unpacked at the place, and the coil is uncoiled in order from the upper LWC while being placed on the pallet.

  That is, in the ETS system, the side plate and the inner cylinder are unnecessary, so that the transportation cost is reduced and the efficiency of the packing and unpacking operations is greatly improved. Further, when the coil is uncoiled, it is not necessary to rotate the coil, and the copper pipe drawn out from the inner surface side of the coil rises spirally and is guided to a predetermined copper pipe processing place. For this reason, special equipment, such as an uncoiler (rotating device) or a turntable, becomes unnecessary. In addition, after the LWC is received at the place where the copper tube is used, it can be uncoiled in order from the upper LWC even in a multi-stage state by simply transporting it to the place of use and unpacking it, greatly reducing the aforementioned work efficiency problem. The

  Further, since the coil is unwound from the inner surface side, the tension acting on the drawn copper pipe acts in the direction of opening the coil. In other words, the force does not act in the direction of tightening the coil due to the tension of the copper tube, so the deformation of the tube in the vertical uncoil or the rubbing or deformation of the tube in the horizontal uncoil is prevented, and the yield of the tube is greatly improved. I think that.

  However, when the above-described conventional technology is used, when the level wound coil is actually uncoiled by the ETS method, the pipe is frequently bent, deformed, recessed, and scraped frequently. This is the yield and productivity. It becomes an obstacle to improvement. That is, in the conventional LWC winding method shown in FIG. 11, after the last portion of the first layer coil is pulled up, the lowermost copper tube of the second layer coil is the copper wound on the top. It is sandwiched between a tube and a pallet. Since the mass of the upper copper pipe is loaded on the sandwiched copper pipe, the pipe is deformed or depressed. In addition, by forcibly pulling out the copper tube that is caught by being caught, excessive tensile force and frictional force are applied to the copper tube, and bending or rubbing occurs.

  In order to solve these problems, the inventors of the present application disclosed in Patent Documents 5 and 6 that a level wound coil and a level wound coil that do not cause bending, deformation, dent, or rubbing of a tube even when the coil is uncoiled by the ETS method. The pipe supply method from the package and level wound coil was proposed. In these Patent Documents 5 and 6, the inventors of the present application arrange the winding start end of the second layer coil of the LWC between the final winding of the first layer coil and the tube immediately before the winding. A technology was proposed in which the LWC was wound so that the lowermost copper pipe had a gap with the pallet, and the LWC was unwound by the ETS method without being caught.

  Further, as described above, at the time of uncoiling by the ETS method, a catch is generated particularly at the winding layer transition portion of the LWC. Patent Document 7 discloses a technique for preventing the LWC from being caught at the winding layer transition portion during uncoiling by disposing the winding layer transition portion of the LWC in a circumferential direction for each layer.

  Further, in Patent Document 8, a hollow portion is formed in all or a part of the LWC pallet mounting body corresponding to the position where the LWC winding layer moves, and the copper tube to be unwound is in the contact position with the pallet. A technique for preventing a catch is disclosed.

Japanese Utility Model Publication No. 4-91891 Japanese Utility Model Publication No. 4-19556 Japanese Utility Model Publication No.2-124859 Japanese Utility Model Publication No. 7-21590 JP 2002-370869 A Japanese Patent Laid-Open No. 2004-2012 JP 2006-282391 A JP 2006-290619 A

  However, the above-described prior art has the following problems. That is, for example, when the mass of the level wound coil is large, when a plurality of level wound coils are stacked and placed on the pallet, or the number of coil turns per level wound coil is larger than the number of winding layers. In many cases, the copper pipe of the level-wound coil arranged with the coil axis vertical, in particular, the transition part of the copper pipe layer located below the level-wound coil has its own weight or above the level-wound coil. A large pressure is exerted by the mass of other loaded level wound coils. Therefore, even when the techniques described in the above cited references 5 to 8 are used, a frictional force against the pulling force is applied to the copper tube during uncoiling, and the copper tube may bend and bend. .

  Moreover, when a copper pipe cannot hold | maintain a position with the contact force of the adjacent copper pipes, for example in the manufacturing process of the bend pipe | tube with which a copper pipe is sent out intermittently, it is in the space produced inside the coil. The copper tube may collapse. In particular, when the uncoiling progresses and the level wound coil layer is reduced, this collapse occurs remarkably. Then, the tube alignment is disturbed due to collapse, and the collapsed copper tubes or the contact between the pulled-out copper tube and the collapsed copper tube may rub against each other and cause wrinkles on the surface.

  And when a collapse occurs on the copper pipe pulled out, when the copper pipe is unrolled, a catch occurs. When the copper tube that has been caught is forcibly pulled out, a frictional force that resists the pulling force, a twisting force that exceeds the coil curl, and the like are loaded between the copper tubes that are hooked and in contact with each other. As a result, the copper pipe bends and bends, which stops the hairpin pipe processing line of the heat exchanger for an air conditioner, for example, and decreases the yield and productivity.

  Further, when the annealing temperature is high, particularly when the annealing time is long, atomic diffusion becomes active in the copper tube, and lattice defects disappear and recrystallization occurs. In particular, since a load is applied to the contact portion between the copper tubes, atomic diffusion is likely to occur, and adjacent copper tubes may be diffusion-bonded at the contact portion due to heating during annealing. This seizure occurs remarkably when the mass of the level wound coil is large and when the number of winding layers of the level wound coil and the number of windings per layer are large. And there exists a problem that it becomes impossible to unwind a copper pipe rapidly by this image sticking.

  The present invention has been made in view of such problems, and when the mass of LWC is large, when a plurality of LWCs are stacked, and when the number of winding layers of LWC and the number of windings per layer are large. To provide a level-wound coil and a level-wound coil package that can be unwound without being bent, deformed and scraped when uncoiled by the ETS method, and that does not cause anko discoloration. With the goal.

  The level-wound coil according to the present invention is a level-wound coil that is placed so that the coil axis direction is vertical and the winding start portion is on the upper side and is unwound from the inside, and the copper or copper alloy tube constituting the level-wound coil Is a surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by high-frequency glow discharge optical emission spectrometry, which is annealed after the outer surface is coated with oil containing silicon oil. The maximum value of the Si concentration is 0.3 to 30 atomic%, and the level-wound coil forms the first layer coil by winding the copper or copper alloy tube in an aligned manner, and then the upper layer of the first layer coil. The second layer coil is fitted into a recess between the copper or copper alloy tubes on the outer surface of the first layer coil and aligned, and thereafter the third layer coil is formed on the second layer coil in the same manner. And the subsequent coils are arranged in sequence and wound, and the number of turns of the even-numbered coil is (n-1), where n is the number of turns of the odd-numbered coil. The winding direction of the odd-numbered layer coil and the winding direction of the even-numbered layer coil are opposite to each other.

  Another level-wound coil according to the present invention is a level-wound coil that is placed so that the coil axial direction is vertical and the winding start portion is on the lower side and is unwound from the inside, and copper or copper constituting the level-wound coil The copper alloy tube is annealed after the outer surface is coated with an oil containing silicon oil, and is analyzed up to 20 nm from the surface of the copper or copper alloy tube when analyzed by high frequency glow discharge optical emission spectrometry. The maximum value of the Si concentration in the surface layer portion is 0.3 to 30 atomic%, and the level wound coil forms the first layer coil by winding the copper or copper alloy tube in an aligned manner, and then the first layer A second layer coil is placed on the coil and aligned and wound on the outer surface of the first layer coil between the copper or copper alloy tube and on both sides thereof. It is composed of a plurality of layers of coils that are formed by sequentially aligning and winding an eye coil and subsequent coils. When n is the number of turns of the odd-numbered coil, the number of turns of the even-numbered coil is (n + 1). The winding direction of the odd-numbered layer coil and the winding direction of the even-numbered layer coil are opposite to each other.

  Still another level-wound coil according to the present invention is a level-wound coil that is placed so that the coil axial direction is vertical and is unwound from the inside, and the copper or copper alloy tube constituting the level-wound coil is outside of the level-wound coil. The maximum concentration of Si in the surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by high-frequency glow discharge optical emission spectrometry, which is annealed after the surface is coated with oil containing silicon oil The level-wound coil is formed by aligning the copper or copper alloy tube to form a first layer coil, and then forming a second layer on the first layer coil. The copper or copper on the outer surface of the first layer coil so that the winding start end of the coil is fitted into a recess between the last winding of the first layer coil and the copper or copper alloy tube of the immediately preceding winding. From the multi-layer coil in which the concave portion between the metal tubes and the outside thereof are aligned and wound, and similarly, the third layer coil and the subsequent coils are sequentially aligned and wound on the second layer coil. If the number of turns of the odd layer coil is n, the number of turns of the even layer coil is n, and the winding direction of the odd layer coil and the winding direction of the even layer coil are opposite to each other. It is characterized by being.

  The level-wound coil package according to the present invention is placed on the pallet in one or more stages such that the level-wound coil is perpendicular to the coil axis direction and the winding start portion is on the upper side. The entire level-wound coil of one or more stages is wrapped in a resin bag, and the outside thereof is tightly wound with a belt-shaped resin film. The copper or copper alloy tube constituting the level-wound coil has its outer surface The maximum value of the Si concentration in the surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by high-frequency glow discharge optical emission spectrometry after being coated with oil containing silicon oil Is 0.3 to 30 atomic%, and the level wound coil is formed by aligning and winding the copper or copper alloy tube to form a first layer coil. The second layer coil is fitted on the outer surface of the first layer coil in the recess between the copper or copper alloy tubes and aligned, and thereafter the third layer coil is placed on the second layer coil in the same manner. , And the subsequent coils, and a plurality of coils stacked in sequence, and when the number of turns of the odd-numbered coil is n, the number of turns of the even-numbered coil is (n−1). The winding direction of the odd-numbered layer coil and the winding direction of the even-numbered layer coil are opposite to each other.

  Other level-wound coil packages according to the present invention are placed on a pallet in one or more stages such that the level-wound coil is perpendicular to the coil axis direction and the winding start portion is on the lower side. The whole of the one-stage or multi-stage level wound coil is wrapped in a resin bag, and the outside thereof is tightly wound with a belt-shaped resin film, and the copper or copper alloy tube constituting the level wound coil is: The Si concentration in the surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by high-frequency glow discharge optical emission spectrometry after being coated with an oil containing silicon oil on its outer surface and then annealed The level-wound coil forms a first-layer coil by winding the copper or copper alloy tube in an aligned manner. A second layer coil is arranged on the outer side of the first layer coil, and is arranged next to the concave portion between the copper or copper alloy tubes on both sides and aligned and wound in the same manner on the second layer coil. The coil is composed of a plurality of coils in which the third layer coil and the subsequent coils are sequentially aligned and laminated. When the number of turns of the odd layer coil is n, the number of turns of the even layer coil is (n + 1). The winding direction of the odd-numbered layer coil and the winding direction of the even-numbered layer coil are opposite to each other.

  Still another level-wound coil package according to the present invention is a single-stage or multi-stage package in which the level-wound coil is placed on the pallet so that the coil axial direction is vertical and the winding start portion is on the upper side or the lower side. Copper or copper alloy constituting the level-wound coil, wherein the entire one-stage or multi-stage level-wound coil is wrapped in a resin bag, and the outside thereof is tightly wound with a strip-shaped resin film. The tube was annealed after the outer surface was coated with oil containing silicon oil, and the surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by high-frequency glow discharge optical emission spectrometry The maximum value of the Si concentration at 0.3 to 30 atomic%, and the level wound coil forms a first layer coil by winding the copper or copper alloy tube in an aligned manner. Thereafter, the second layer coil is placed on the first layer coil so that the winding start end thereof is fitted into the recess between the copper or copper alloy tube of the last winding of the first layer coil and the immediately preceding winding. Arrange the windings on the outer surface of the eye coil between the copper or copper alloy tubes and arrange them on the outside and arrange them in the same way. Then, arrange the third layer coil on the second layer coil and the subsequent coils in order. The number of turns of the even-numbered coil is n, where the number of turns of the odd-numbered coil is n, and the winding direction of the odd-numbered coil and the even-numbered layer The coil winding directions are opposite to each other.

  According to the present invention, after an appropriate amount of mixed oil containing silicon oil is applied to the surface of the copper pipe constituting the level-wound coil, the copper pipe wound around the level-wound coil is annealed. In particular, seizure is likely to occur on the lower surface side of the level-wound coil that receives a load when the level-wound coil is placed and annealed so that the coil axis direction thereof is vertical. Therefore, when the level wound coil is unwound by the ETS method, the pipe can be smoothly pulled out from the layer transition portion on the lower surface side of the level wound coil to be unwound. In addition, even when tube seizure does not occur, since the Si component remaining on the surface of the copper tube has a lubricating action, when pulling out the tube from the layer transition portion on the lower surface side of the level wound coil, and when uncoiling the copper tube When collapse occurs, the pull-out resistance of the tube decreases, and the tube can be pulled out without causing bending or bending. Therefore, for example, it is possible to prevent the yield and productivity of an air conditioner heat exchanger from decreasing.

  Furthermore, the mixed oil containing silicon oil is applied in an appropriate amount so that the Si concentration entering the copper pipe surface layer after annealing is appropriate. Therefore, the protective film formed on the tube surface does not exhibit hygroscopicity after annealing. For this reason, even when the mass of LWC is large, when multiple LWCs are stacked, and when the number of winding layers of LWC and the number of windings per layer are large, the occurrence of seizure of the copper tube during annealing is suppressed. However, it is possible to prevent anko discoloration. Moreover, since it is possible to increase the mass of LWC, the number of winding layers, and the number of windings per layer, the degree of freedom in designing the shape of LWC can be increased.

It is sectional drawing which shows the winding method of LWC which concerns on 1st Embodiment of this invention. It is a schematic diagram explaining the manufacturing method of the LWC similarly. It is the model explaining the unwinding method of the LWC similarly. It is a side view which shows the packaging method of LWC which concerns on embodiment of this invention in the order of the process. (A) thru | or (c) is a side view which shows the packaging method of the package of LWC which concerns on this embodiment in order of the process, and shows the next process of FIG.4 (i). It is a schematic diagram explaining the manufacturing method of LWC which concerns on 2nd Embodiment of this invention. It is the model explaining the unwinding method of the LWC similarly. It is a schematic diagram explaining the manufacturing method of LWC which concerns on 3rd Embodiment of this invention. It is the model explaining the unwinding method of the LWC similarly. It is a perspective view which shows the uncoil method by an ETS system. It is sectional drawing which shows the winding method of the conventional LWC. It is a perspective view which shows a vertical decoiler (rotating device). It is a perspective view which shows a horizontal decoiler (rotating device). (A) is a perspective view which shows LWC at the time of transport, (b) is a perspective view which shows LWC in a use place. It is an example of the measurement result of the atomic concentration of the depth direction by a GD-OES apparatus.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a method for producing a level-wound coil (LWC ((n, n-1) winding)) according to the first embodiment of the present invention, and FIG. 2 is a schematic view showing the upper half of this LWC. FIG. 3 is a schematic diagram for explaining this LWC unwinding method. 4 (a) to 4 (i) and 5 (a) to 5 (c) are side views showing the packaging method of the LWC packaging according to this embodiment in the order of the steps. In FIGS. 1 to 3, the cross section of the copper tube 1 is shown by a circle for simplification of illustration.

  First, a method for winding the LWC 110 will be described. A copper or copper alloy tube whose outer surface is coated with oil is wound around a level-wound coil using the rotating devices 103 and 104 shown in FIG. As shown in FIG. 1, the bobbin 2 attached to the rotation shafts of the rotation devices 103 and 104 has a cylindrical inner cylinder 2b and side plates 2a attached to both end portions of the inner cylinder 2b.

  In this embodiment, first, the copper tube 1 is positioned at the left end of the inner cylinder 2b, and the bobbin 2 is rotationally driven by the rotating devices 103 and 104 using this as the winding start portion 111, so that the copper tube 1 is moved to the inner cylinder 2b. Winding in the right direction in FIG. 2 and aligning winding (traverse winding). That is, the copper tube 1 is wound around the inner cylinder 2b by aligned winding so that there is no gap in the copper tube portion and is always in contact.

  As shown in FIG. 2, when the winding of the first layer coil is completed, the copper tube portion at the end of the first layer comes into contact with the side plate 2a. Accordingly, the axial length of the inner cylinder 2b is an integral multiple of the outer diameter of the copper tube 1, where n is the number of turns of the first layer coil and D is the outer diameter of the copper pipe 1. The length of 2b is substantially nD. When the winding of the first layer coil is completed, the second layer coil has a copper tube portion 22 at the winding start end, the last winding (nth) of the first layer coil and the immediately preceding winding (n-1th winding). 2) and are sequentially wound in an aligned manner in the left direction of FIG. Since there is not enough room for another coil to enter the side plate 2a in the final winding portion at the left end of the second layer coil, the third layer winding is left with a gap left between the side plate 2a. Move on. Therefore, the number of turns of the second layer coil is n-1 less than the number of turns n of the first layer coil. The third layer coil is wound n times as in the first layer in the right direction of FIG. In this case, similarly to the first layer, the left and right copper tube portions of the third layer are in contact with the side plate 2a. In the fourth layer, like the second layer, the copper tube portion 113 at the winding start end is disposed with a gap between the side plate 2a and the copper tube is wound around the left side of FIG. Similarly, the subsequent coils are sequentially aligned and wound to laminate a plurality of layers of coils.

  In this way, when the number of turns of the odd-numbered layer coil is n, the number of turns of the even-numbered layer coil is (n-1), and the winding direction of the odd-numbered layer coil and the even-numbered layer coil The LWC 110 whose winding direction is opposite to each other is obtained.

  The LWC 110 manufactured in this manner is wound with a copper band or the like around the outermost periphery, and is then unwound. Then, the side plate 2a is removed from the inner cylinder 2b to disassemble the bobbin 2, and the bobbin 2 is removed from the LWC 110. Next, it anneals so that a predetermined tempering process may be performed. Although there is no restriction | limiting in particular about the tempering conditions of a pipe | tube, Generally, it is preferable to set it as a soft material or a semi-hard material.

  The LWC 110 manufactured as described above is unwound by the ETS method shown in FIG. Further, the copper or copper alloy tube constituting the level-wound coil is coated with an oil containing silicon oil on its outer surface, and is annealed after being wound around the level-wound coil. In this level-wound coil after annealing, the maximum value of the Si concentration in the surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by the high-frequency glow discharge optical emission spectrometry is 0.3 to 30 atomic%. .

  In order to prevent the copper tube from being caught when the level wound coil is unrolled, the inventors of the present application attach silicon oil, which has been used as a mold release agent for a casting mold, to the surface of the copper tube, The maximum value of the Si concentration in the surface layer portion of the copper tube after winding and annealing is set to 0.3 atomic% or more, and by leaving this amount of Si on the surface, seizure of the copper tube is prevented, and its lubrication It has been found that the copper tube can be smoothly unwound by the ETS method due to the action. When the maximum value of the Si concentration in the surface layer portion from the surface of the copper tube to 20 nm is less than 0.3 atomic%, the heat resistance of the copper tube surface and the lubricity after annealing are insufficient, and the contact of the copper tube during annealing The seizure at the portion and the copper tube are easily caught during uncoiling. On the other hand, silicone oil is denatured into hydrophilic silicate by heating. When the silicon oil is denatured into silicate on the surface of the copper tube, moisture adsorbability is increased, and the anko discoloration is likely to occur. And when the maximum value of Si concentration in the surface layer part from the surface of a copper pipe to 20 nm exceeds 30 atomic%, the quantity of the silicate produced | generated on the copper pipe surface at the time of annealing will become excessive, and the moisture adsorptivity will become high. Therefore, anko discoloration is likely to occur. Therefore, in the present invention, the maximum value of the Si concentration in the surface layer portion from the surface of the copper tube to 20 nm is defined as 0.3 to 30 atomic%.

The Si concentration in the surface layer of the copper or copper alloy tube is determined by the composition of the oil applied to the outer surface of the tube before winding up the level wound coil, the ratio of silicon oil in the mixed oil, and the oil remaining on the outer surface of the tube. Can be controlled by adjusting the amount. When applying oil containing silicon oil to the outer surface of the copper or copper alloy tube before winding, for example, the surface is rubbed with rubber packing to remove excess oil, and an appropriate amount is applied to the outer surface of the tube. A protective film is formed by leaving oil. At this time, the amount of oil remaining on the outer surface of the tube is, for example, 2.5 to 15.0 mg / dm ² . The amount of oil remaining on the outer surface of the tube can be controlled by adjusting the hole diameter of the rubber packing that is used for the tube.

  The oil applied to the outer surface of the pipe is, for example, polybutene, phenylethyl ether, diphenylethyl ether, ethyl methyl ether, diethyl methyl ether, normal paraffin, isoparaffin, cycloparaffin, etc. Among the hydrogen and alicyclic hydrocarbon compounds, at least one mixed oil is used as a base oil, and silicon oil such as polydimethylsiloxane is contained in an amount of 0.2 to 7% by mass.

  Conventionally, the number of turns of the coil in each layer is the same as n, but in the present embodiment, the odd layer is n and the even layer is n-1. Such a change in the process for manufacturing the LWC 110 can be easily performed by a method such as a change in the winding angle control method during traverse winding and a change in the interval between the side plates 2a.

  In the present embodiment, the number of coil winding layers of the LWC 110, the number n of coil windings per layer (odd layer), and the mass of the LWC are not particularly limited. Generally, the number of winding layers is about 10 to 200 times, the number n of windings per layer is about 10 to 100 times, and the mass of the LWC 110 is about 50 to 500 kg.

  In addition, there is no restriction | limiting in particular about the material of a copper pipe, This invention can be applied to the coil of the copper or copper alloy pipe (inner surface grooved pipe | tube or smooth pipe) used for a heat exchanger tube, hot water supply, building piping, etc. it can. Examples of the material for forming the copper tube include pure copper such as C1020 and C1100 specified in JIS H3300, phosphorous deoxidized copper such as C1201 and C1220, Cu—Sn—P alloy (Cu—0.1 to 1.0 Sn). -0.01-0.05P, etc.), Cu-Sn-Zn-P alloys (Cu-0.1-1.0 Sn-0.1-1.0 Zn-0.01-0.05P, etc.) Alloys can be used. Of the compositions contained in these pure copper or copper alloys, Si is oxidized during melt casting and is easily caught in the ingot and becomes an inclusion. If there are inclusions, an oxide film of Si is likely to be formed when a copper alloy tube is formed, which causes cracking of the tube during bending and surface roughness. Moreover, even if Si is a trace amount, it dissolves in Cu and decreases the electrical conductivity. Therefore, in the composition of the copper tube, the Si component is less than 50 ppm, preferably less than 30 ppm, and more preferably less than 15 ppm.

  Furthermore, there is no particular limitation on the dimensions of the tube. However, if the thickness of the tube is too thin, a torsional force acts on the tube during uncoil described later, so that the tube is easily deformed. In general, the outer diameter is preferably about 4 to 25 mm and the wall thickness is about 0.15 to 1.5 mm.

  Furthermore, there is no particular limitation on the tempering of the pipe. In the case of a copper tube, in general, it is preferably applied to a soft material or a semi-hard material, but can also be applied to a hard material, and the value of (tube bottom thickness / tube outer diameter) is 0.03. The above is preferable. After producing LWC with a hard material, it can also be annealed into a soft or semi-hard material.

  Next, the packaging body of the level wound coil according to the present embodiment will be described. As shown in FIG.5 (c), in the packaging body of the level-wound coil of this embodiment, the pallet 11 made of wood or resin is provided, and the polyethylene sheet 12 having a film thickness of, for example, 50 μm is provided on the pallet. Is placed. The above-described LWCs 110 are vertically stacked on the polyethylene sheet 12 so that the central axis is vertical to form a three-stage coil 16. Further, a polyethylene bag 17 having a thickness of, for example, 50 μm is covered so as to cover the pallet 11, the polyethylene sheet 12, and the three-stage coil 16, and the entire three-stage coil 16 is covered with the polyethylene sheet 12 and the bag 17. Wrapped. Further, the side surface of the polyethylene bag 17 is wound and covered with the stretched resin film 14. Thereby, the packaging material of this embodiment is formed. Note that a cushion material 13 made of a polyethylene foam material having a thickness of 5 mm, for example, may be placed between the polyethylene sheet 12 and the three-stage coil 16. Further, a liner 105 may be provided between the LWCs 110 at the respective stages and above the uppermost LWC 110, and a three-stage coil may be formed by the three-stage LWCs 110 and the liners 105 provided at three positions. And by providing the cushioning material 13 and the liner 105, these protect the LWC 110 at the time of transportation.

  The level-wound coil mounting pallet 11 of the present embodiment is planar on the LWC mounting surface. When the LWC 110 is placed, the pallet 11 comes into contact with the copper pipe 1 located at the lowest level of the odd-numbered layer, but the pallet 11 at a position in contact with the copper pipe 1 is partially recessed. Also good. Then, since the copper tube 1 and the pallet 11 are not in contact with each other at the position of the concave portion of the pallet 11, it is possible to prevent the occurrence of catching at the time of uncoiling in the transition portion from the odd layer to the even layer of the LWC 110.

  Next, a method for packing an LWC packing body according to the present embodiment will be described. First, as shown in FIG. 4A, a pallet 11 made of wood or resin is prepared. Next, as shown in FIG. 4B, a polyethylene sheet 12 having a film thickness of, for example, 50 μm is placed on the pallet 11. Next, as shown in FIG. 4C, a cushion material 13 made of, for example, a polyethylene foam material having a thickness of 5 mm is placed on the polyethylene sheet 12. Then, as shown in FIG. 4 (d), on this cushion material 13, the coil of the copper or copper alloy tube from which the bobbin is removed, that is, the first-stage LWC 110 is made vertical in the axial direction. As shown, the coil is placed with the winding start portion 111 facing upward. At this time, the copper band wound for winding is cut off before annealing. And if necessary, the LWC 110 is bound with a band made of polypropylene or a string made of polyethylene.

  Thereafter, as shown in FIG. 4E, a circular liner 105 is placed on the first-stage LWC 110. Next, as shown in FIG. 4 (f), the second-stage LWC 110 is placed on the liner 105 so that the winding start portion 111 faces upward, and as shown in FIG. 4 (g), the second-stage LWC 110 is placed. The liner 105 is placed on the LWC 110 of the above. Next, as shown in FIG. 4 (h), the third-stage LCW 110 is placed on the liner 105 so that the winding start portion 111 faces upward, and as shown in FIG. 4 (i), the third-stage LCW 110 is placed. The liner 105 is placed on the LWC 110 of the above. Thereby, the LWC 110 is stacked in three stages with the liner 105 interposed therebetween (hereinafter, the copper or copper alloy tube coils stacked in the three stages are referred to as three-stage coils 16). These liners 105 serve as cushions between the LWCs 110 and protect the LWCs 110 during transportation.

  Next, as shown in FIG. 5A, a polyethylene bag 17 having a thickness of, for example, 50 μm is placed on the three-stage coil 16 to cover the three-stage coil 16. Next, as shown in FIG. 5B, for example, a strip-shaped resin film 14 made of polyethylene having a width of 500 mm and a thickness of 25 μm is prepared, and the three-stage coil is maintained while the stretched state of the resin film 14 is maintained. The periphery of 16, that is, the outside of the bag 17 is covered while being wound from the upper part to the lower part, and further to the pallet 11.

  Next, as shown in FIG. 5C, the periphery of the three-stage coil 16 is again wound around the stretched resin film 14 from the lower part to the upper part. Thereby, the three-stage coil 16 is stretch-wrapped by the double resin film 14 together with the pallet 11. In this case, the resin film 14 is wound while being stretched under tension so that the length is approximately doubled, for example. If it does so, the resin film 14 will become thin about 70 to 80% of the width | variety before expansion | extension. 5 (b) and 5 (c), gaps are shown between the three-stage coil 16 and the bag 17 and between the bag 17 and the resin film 14 for convenience of illustration. By tensioning the resin film 14, these gaps become extremely partial, and the side surfaces of the three-stage coil 16 are restrained by the resin film 14. By stretching and packaging the three-stage coil 16 with the resin film 14, the polyethylene bag 17 and the resin film 14 tighten the LWC 110 from the outer surface side, so that the weight of the level-wound coil or other level-wound coils loaded above the level-wound coil The tightening force in the coil axis direction due to mass or the like can be reduced.

  And if necessary, the LWC 110 is fixed to the pallet 11 so that the LWC 110 does not move during transportation. For example, an LWC-fixing wooden support (not shown) having a height substantially equal to the height of the three-stage coil 16 is erected at the center of each of the four sides of the pallet 11, and further, The upper end is reinforced by fixing it in a cross shape with a wooden plate, and an iron band is attached to the column and plate from the bottom of the pallet to the upper surface of the uppermost LWC. In this state, stretch packaging is performed with a plurality of layers of resin films from the lower surface of the pallet to the upper surface of the uppermost LWC so that the external atmosphere does not easily enter the coil.

  In the present embodiment, as described above, since the three-stage coil 16 is stretch-wrapped with the pallet 11 by the polyethylene bag 17 and the resin film 14, the three-stage coil 16 can be almost completely sealed. By such stretch wrapping (tensile winding), the outer peripheral surface of the LWC receives a restraining force from the resin film. For this reason, by unwinding the copper tube while keeping the stretch wrapping of the LWC outer peripheral surface, it is possible to prevent the tube from being scattered on the LWC outer peripheral side. As described above, in order to prevent deformation and wrinkling of the uncoiled tube, it is desirable that the number m of winding layers of the coil is an odd number and the number of windings of the outermost layer is n.

  In addition, the LWC 110 (three-stage coil 16) is stretch-wrapped with the resin film 14, so that moisture can be prevented from entering the LWC 110 during storage and transportation, and discoloration of the LWC can be prevented. Can do. The bag 17 and the resin film 14 covering the outer surface of the three-stage coil 16 may be made of polyethylene. Although the resin has a slight moisture permeability, it can prevent moisture from entering the coil and prevent discoloration of the copper tube. The thickness of the resin film is not particularly limited, but may be selected from about 10 to 100 μm. Usually, about 30 to 70 μm may be used. In order to enhance the sealing effect, it is preferable to use multi-layer winding.

  Further, the cushion material 13 interposed between the pallet 11 and the LWC 110 and the liner 105 as a buffer material interposed between the LWCs 110 when the LWCs 110 are stacked in a plurality of stages are made of foamed polyethylene having a thickness of about 1 mm. Although a thing etc. can be used, when there is no possibility of discoloration inside a coil, a corrugated board etc. can be used as these buffer materials. In this case, the cushion member 13 and the liner 105 are preferably made of a material having a large friction coefficient in order to prevent the pallet 11 and the LWC 110 from slipping and shifting during transportation and unwinding. . Further, by installing the cushion material 13 and the liner 105 between the pallet 11 and the LWC 110, the weight of the LWC 110 or the mass of the other LWC 110 loaded above is loaded on the cushion material 13 and the liner 105. In this case, in order to prevent the LWC 110 from biting in the thickness direction of the cushion material 13 or the liner 105 and lowering the unwinding property, a resin sheet is pasted on both surfaces of a plywood such as a wood, and the LWC 110 is placed. You may use as this cushion material 13 and the liner 105 what stuck the plate-shaped paper about 2 mm in thickness to this resin sheet according to the part. Moreover, in the part where LWC110 is not mounted, what stuck the plate-shaped paper about 2 mm thick may be used instead of the resin sheet. In these cases, if the cushion material 13 or the liner 105 is partly cut out corresponding to the portion on which the LWC 110 is placed or if the cushion material 13 or the liner 105 is partially recessed, the LWC 110 In the transition from the odd layer to the even layer, it is possible to prevent the occurrence of catching at the time of uncoiling. It is desirable that the dew point of the atmosphere when packing the LWC 110 is low, and the dew point during packing is preferably 22 ° C. or lower.

  Further, the resin film 14 is cut on the liner 105 by a cutter or the like at the time of unpacking, but the three-stage coil 16 is not accidentally damaged by the liner 105.

  4 and 5, when the LWC is not transported and stored, that is, for example, the LWC can be transported and stored in the bobbin. In this case, the LWC is uncoiled. When doing so, it is necessary to remove this bobbin first. However, in this case, since it takes time and effort to remove the inner cylinder and the side plate, as shown in FIG. 5C, a plurality of LWCs 110 are placed on the pallet 11 and packed without a bobbin. Is preferred. In this way, by packing the LWC 110 without a bobbin, the LWC 110 can be uncoiled while being placed on the pallet 11 simply by unpacking at the place of use. In addition, the guide 115 is not limited to a tubular shape through which a copper tube is inserted, and may be a wax shape, a conical shape, or a roll shape.

  In addition, the three-stage coil 16 of the present embodiment is placed on the pallet 11 from the polyethylene sheet 12, and after the LWC 110 is stacked in three stages, the entire three-stage coil is covered with a polyethylene bag 17. Then, after cutting off the copper band for winding, each LWC may be wrapped with a polyethylene belt-like film from the outer surface side, and a tape may be attached to the seam of the film for packaging.

  Further, in the present embodiment, the entire LWC 110 is tightly wound from the outside of the polyethylene bag 17 with the belt-shaped resin film 14, but instead of the belt-shaped resin film 14, for example, a resin band is used. The entire pallet 11 and LWC 110 may be bundled.

  The three-stage coil 16 composed of three LWCs 110 is transported and stored in the state of the package shown in FIG.

  Next, a method for supplying a copper tube from the level wound coil package according to the present embodiment will be described. After the LWC package is transported or stored, the LWC 110 is uncoiled at the point of use, and the copper tube 1 is continuously supplied to an assembly site such as a heat exchanger. In this case, first, the packed three-stage coil 16 shown in FIG. Then, the resin liner 14 and the polyethylene bag 17 are cut by a cutter or the like using the uppermost liner 105 as a backing material and removed. Next, after removing this liner 105, the resin film 14 and the bag 17 are removed, and the three-stage coil 16 is unpacked. Alternatively, after the three-stage coil 16 is placed, the resin film 14 and the polyethylene bag 17 are cut with a cutter or the like using the uppermost liner 105 as a backing material, and the three-stage coil 16 in the resin film 14 and the bag 17 is cut. Only the part covering the upper surface of the substrate is removed. Next, only the uppermost liner 105 is removed. That is, only the packing material covering the upper surface of the three-stage coil 16 is removed, and the tension winding of the LWC outermost peripheral surface by the resin film 14 is not released.

  Next, the operation of the LWC according to the above-described embodiment of the present invention will be described. As described above, the package of LWC 110 is packaged such that each LWC 110 constituting the three-stage coil has the coil axis vertical and the winding start portion is upward. After removing the packaging material covering at least the upper surface of the package of LWC 110, as shown in FIG. 10, the starting end is drawn upward from the package of LWC 110 placed at the place of use, and the copper tube 101 is passed through guide 115 and the like. Is supplied to the assembly site. Then, the coil (first layer coil) on the inner surface side of the LWC 110 shown in FIG. 3 is unwound and separated from the inner surface of the coil. Then, when the copper tube portion at the lowermost end (rightmost end in FIG. 1) of the first layer coil is detached from the inner surface of the coil, the copper tube portion 112 at the winding start end at the lowermost end (rightmost end) of the second layer coil becomes the inner surface of the coil. Start leaving.

  In the present embodiment, the copper tube 1 is unwound from the inner surface of the coil 110, and in the even-numbered coil row, the copper tube portion 112 to be unwound first is the upper copper tube portion and the side plate 2a. Is not restrained between. Accordingly, all the coil arrays of the odd layer and the even layer are smoothly unwound from the coil 110. After the uppermost LWC 110 of the three-stage coils 16 is uncoiled, the second and lowermost LWCs 110 are smoothly uncoiled in the same manner.

  In addition, the level-wound coil of the present embodiment is coated with an oil containing silicon oil whose Si concentration after annealing is optimized on the outer surface of the copper or copper alloy tube. Therefore, even when the mass of LWC is large, when multiple LWCs are stacked, and when the number of windings per layer of LWC is large, the frictional force between copper tubes is reduced by the lubricity of oil, In this case, the copper pipe is not bent and does not break. Therefore, since it is possible to increase the mass of LWC, the number of winding layers, and the number of windings per layer, the degree of freedom in designing the shape of LWC can be increased.

  In addition, even when the copper tube collapses during uncoiling by the ETS method, the copper tube does not get caught due to the lubricity of the oil containing silicon oil, and the copper tube may be bent, deformed, and scratched. Absent. Therefore, for example, it is possible to prevent the yield and productivity of an air conditioner heat exchanger from decreasing.

  Furthermore, in the level-wound coil of the present embodiment, the Si concentration after annealing is optimized in the oil containing silicon oil applied to the surface of the copper tube. And the protective film formed on the tube surface does not exhibit hygroscopicity after annealing. Therefore, when the mass of LWC is large, when multiple LWCs are stacked, and when the number of winding layers of LWC and the number of windings per layer are large, while suppressing the occurrence of seizure of the copper tube during annealing, It is possible to prevent the anko discoloration from occurring.

  Next, the LWC ((n, n + 1) winding) according to the second embodiment of the present invention will be described. FIG. 6 is a schematic diagram showing a method for manufacturing the LWC 30 of the second embodiment, and FIG. 7 is a schematic diagram showing a method for unwinding the LWC. In this embodiment, as shown in FIG. 6, the first layer coil is wound n times from the winding start portion 31, and then the second layer is placed between the final winding of the first layer and the side plate 2 a of the bobbin. The winding start end of the first layer coil is disposed, the concave portion between the tubes on the outer surface of the first layer coil and the second layer coil are disposed on both sides thereof, and the second layer coil is wound by aligned winding. Then, the final winding of the second layer coil is disposed between the winding start portion 31 of the first layer coil and the side plate 2a, and then the third layer coil is adjacent to the second layer coil. It fits into a recess formed between the tubes, and is aligned and wound. Similarly, the subsequent coils are sequentially aligned and wound to laminate a plurality of layers of coils. Therefore, if the number of turns of the first layer coil is n, the number of turns of the second layer coil is n + 1, the number of turns of the first layer coil is n, the odd number is n times, and the even number is N + 1 aligned windings. The distance between the side plates 2a is set based on (n + 1) times the outer diameter of the tube.

  As shown in FIG. 7, the LWC 30 configured as described above is placed on a pallet with its coil axis vertically, with the winding start portion 31 facing downward. Then, when the copper tube 1 is pulled upward from the winding start portion 31, the first layer coil is pulled out sequentially from the lower side to the upper side as indicated by the arrows. Then, after the uppermost stage of the first layer coil is pulled out, the uppermost stage of the second layer coil is pulled out. Next, the second layer coil is sequentially drawn downward from above. After the lowermost layer of the second layer coil is pulled out, the lowermost layer copper tube 1 of the third layer coil is pulled out. Since there is a gap in the wall, it is not restrained. For this reason, the third layer coil is also drawn out smoothly. Thus, the LWC 30 of this embodiment can also smoothly pull out the copper tube.

  Also in the level-wound coil of the present embodiment, when an oil containing silicon oil whose Si concentration after annealing is optimized is applied to the outer surface of the copper or copper alloy tube, and the mass of the LWC is large, there are a plurality of LWCs. Even when stacked and when the number of windings per layer of LWC is large, the frictional force between the copper tubes is reduced by the lubricity of the oil, and the copper tube bends and breaks during uncoiling. There is nothing. Therefore, since it is possible to increase the mass of LWC, the number of winding layers, and the number of windings per layer, the degree of freedom in designing the shape of LWC can be increased.

  In addition, even when the copper tube collapses during uncoiling by the ETS method, the copper tube does not get caught due to the lubricity of the oil containing silicon oil, and the copper tube may be bent, deformed, and scratched. Absent. Therefore, for example, it is possible to prevent the yield and productivity of an air conditioner heat exchanger from decreasing.

  Next, LWC ((n, n) winding) according to a third embodiment of the present invention will be described. FIG. 8 is a schematic diagram showing a method for producing an LWC according to the third embodiment, and FIG. 9 is a schematic diagram showing a method for unwinding the LWC. In this embodiment, as shown in FIG. 8, the first layer coil is arranged n times, and the winding start end of the second layer coil is between the final winding of the first layer coil and the tube immediately before it. Thereafter, the concave portion between the tubes on the outer surface of the first layer coil and the second layer coil are arranged on both sides thereof, and the second layer coil is aligned and wound. Then, the final winding of the second layer coil is arranged between the winding start portion 41 of the first layer coil and the side plate 2a, and the second layer winding is finished. Next, the third layer coil and the fourth layer coil are arranged n times by placing the winding start end between the final winding of the coil of the lower layer of the first layer and the tube immediately before it. Similarly, the subsequent coils are sequentially aligned and wound to laminate a plurality of layers of coils. In the present embodiment, the number of turns of the odd-numbered and even-numbered coils is all n.

  As shown in FIG. 9, the LWC 40 configured in this way is placed on a pallet with its coil axis vertically, with the winding start portion 41 facing upward. Then, when the copper tube 1 is drawn upward from the winding start portion 41, the first layer coil is drawn out sequentially from the top to the bottom as shown by the arrows. When the first layer coil is pulled out to the lowest level, the second level copper tube 1 drawn out first is the lowest level, and this lower level copper tube 1 has a gap between it and the pallet. Leave and be pulled out smoothly. Thus, the LWC 40 of this embodiment can also smoothly pull out the copper tube.

  Also in the level-wound coil of the present embodiment, as in the first and second embodiments, the outer surface of the copper or copper alloy tube is coated with oil containing silicon oil whose Si concentration after annealing is optimized. When the mass of LWC is large, when multiple LWCs are stacked, and when the number of windings per layer of LWC is large, the frictional force between the copper tubes is reduced by the lubricity of the oil. In addition, the copper tube is not bent and does not break. Therefore, since it is possible to increase the mass of LWC, the number of winding layers, and the number of windings per layer, the degree of freedom in designing the shape of LWC can be increased.

  In addition, even when the copper tube collapses during uncoiling by the ETS method, the copper tube does not get caught due to the lubricity of the oil containing silicon oil, and the copper tube may be bent, deformed, and scratched. Absent. Therefore, for example, it is possible to prevent the yield and productivity of an air conditioner heat exchanger from decreasing.

  Note that the LWC 40 of the present embodiment may be placed on the pallet with the winding start portion 41 facing downward. In this case, the odd-numbered and even-numbered lowermost copper tubes 1 are arranged in the same manner as the lowermost copper tubes of the LWC 30 of the second embodiment in relation to the pallet. Therefore, also in the third embodiment, when the winding start portion 41 is set downward and the first layer coil is sequentially pulled out from below, the second layer coil is sequentially pulled out from above, When the extraction of the second layer coil reaches its lowermost stage, there is a gap between the lowermost copper tube of the third layer coil and the pallet. Therefore, the third layer coil is also drawn out smoothly. As described above, in the LWC of the third embodiment, the winding start part 41 may be placed on the pallet with the winding start part 41 facing upward, or the winding start part 41 may be placed on the pallet with the winding start part 41 facing down.

  Hereinafter, the effects of the present invention will be described with respect to the characteristics of the examples of the present invention in comparison with comparative examples that are outside the scope of the present invention.

  For the production of the level wound coil of this example and comparative example, a phosphorous deoxidized copper pipe defined in JIS H3300 C1220 having an outer diameter of 7 mm and a wall thickness of 0.3 mm was used.

First, before winding on a level-wound coil, an oil containing silicon oil was applied to the surface of the copper tube. This oil includes polybutene, phenyl ethyl ether, diphenyl ethyl ether, ethyl methyl ether, diethyl methyl ether, normal paraffin, isoparaffin, cycloparaffin and other chain saturated hydrocarbons, chain unsaturated hydrocarbons, alicyclic hydrocarbons Among the compounds, an oil containing at least one mixed oil as a base oil and containing 0.2 to 7% by mass of silicon oil such as polydimethylsiloxane was used. Excess oil on the surface of the copper tube was removed with a rubber packing or the like, and the amount of oil remaining on the surface of the copper tube was adjusted to 2.5 to 15.0 mg / dm ² . And the composition of the oil apply | coated to the outer surface of a copper pipe, the ratio of the silicone oil in mixed oil, and the quantity of the oil component which remain | survives on the outer surface of a pipe | tube were changed. The amount of residual oil on the surface of the copper tube was controlled by changing the hole diameter of the rubber packing. Also, the amount of residual oil was standardized by cutting the copper tube after application of oil into small pieces (batch) and measuring the amount of oil remaining on the batch.

  Next, the copper tube coated with oil was wound around the LWC by the rotating device shown in FIG. The LWC varied the number of even layers and the number of layers.

  And the copper pipe wound up by LWC was annealed. The annealing was performed using a roller hearth furnace and passing the LWC through a heating zone in a reducing gas atmosphere. The temperature in the furnace was controlled at one point (for example, the temperature in the furnace at 500 ° C.) so as to be distributed in the range of 400 to 630 ° C. so that the tempering of the LWC was uniform. The LWC was passed through this heating zone for 15 to 30 minutes, then passed through the cooling zone for 20 minutes or more, and the temperature was controlled so that the outer surface temperature of the LWC was 50 ° C. or less, and the furnace was discharged.

  From the LWC after annealing with a different number of winding layers, the copper tube at the 10th layer from the outermost layer where the annealing conditions are the same, the central position in the coil axial direction was taken as a sample, and GD-OES analysis was performed on the surface of this copper tube. . In the GD-OES analysis, the analysis target element was C, O, Si, and Cu on the outer surface of the copper tube, and the distribution in the depth direction was performed to a depth where the Cu emission intensity was constant.

  The atomic concentration was measured with a GD-OES apparatus, and the obtained mass concentration was measured in advance using a standard sample (C: 0.792 mass% and 0.394 mass%, O: 47.07 mass%, Si: 0.00. 289 mass% and 0.96 mass%, Cu: 0.286 mass% and 99.99 mass%), and converted into atomic concentration.

  The measurement depth was measured with a GD-OES apparatus, and the obtained sputtering time was converted into a measurement depth based on the sputtering time of a standard sample measured in advance and the sputter crater depth measured with a surface roughness meter. The surface roughness meter used was calibrated with a step standard sample (9090 ± 5%). An example of the measurement result of the atomic concentration of Si in the depth direction by the GD-OES apparatus used in this example is shown in FIG. In FIG. 15, each measurement result shows the atomic concentration of Si in the depth direction in various copper tube samples.

The measurement conditions with the GD-OES apparatus are as follows.
Analysis device: GD-PROFILER type 2 GD-OES manufactured by HORIBA, Ltd.
Analysis mode: Pulse sputter anode diameter (analysis area): φ4 mm
Discharge power: 35W
Ar gas pressure: 600 Pa

  And the unwinding test and the candy discoloration test were done about each sample from which the maximum value of the atomic concentration of Si in the surface layer part from a copper pipe surface after annealing to 20 nm, the number of turns of an even number layer, and the number of winding layers differs.

(Unwinding test method)
The sample LWC was placed on a pallet with its coil axis vertical. When the LWC is the (n, n-1) method, the winding start part is placed upward, and when the LWC is the (n, n + 1) method, the winding start part is placed downward, In the case of the (n, n) method, the coil was placed so that the winding start portion was upward or downward. Then, the copper pipe starting end was pulled out, passed through a pipe-shaped guide installed approximately 2 m above the upper surface of the LWC, and continuously pulled out at a speed of 1 m / sec by the ETS method shown in FIG. In addition, the buffer material of the independent foaming form made from polyethylene and 1 mm in thickness was previously mounted on the upper surface of the pallet.

  If the LWC is unwound by one coil and no catch or deformation of the copper tube has occurred once, ○, if the catch occurs once or twice, △, if the catch occurs more than 3 times × It was determined.

(Anko discoloration test method)
The LWC to be measured was placed in a prefabricated constant temperature and humidity chamber and stacked in three stages on a wooden pallet. And indoor temperature and humidity were fluctuated regularly. The constant temperature and humidity conditions are temperature 40 ° C., humidity 70%, temperature 25 ° C., humidity 95%, and kept at each constant temperature and humidity point for 3 hours (3 hours each transition time between constant temperature and humidity points). did. And this 12 hours was made into 1 cycle, and 10 cycles were passed about LWC of each measuring object. After 10 cycles, the LWC was taken out of the constant temperature and humidity chamber and unwound and checked for the presence or absence of anko discoloration. And the thing which did not have anko discoloration was judged favorable.

First Test Example In this first test example, the atomic concentration of Si in the surface layer portion from the surface of the copper tube after annealing to 20 nm is measured for LWCs in which the number of turns of the odd and even layers is (n, n-1). It is an Example and the comparative example about the sample which changed the maximum value variously. Table 1 shows the LWC mass and the number of coil turns for coil types A, B, C, and D having different coil masses or coil turns. In addition, Table 2 shows the results of the unwinding test and the anko discoloration test for these samples.

  As shown in Table 2, Example No. 3 to 8, no. 13 to 16, no. 19 to 21, and no. In Nos. 24 to 26, since the maximum value of the Si concentration by the high frequency glow discharge optical emission spectrometry satisfies the range of the present invention, Comparative Examples No. 1, 2, 11, 12, 18 and no. Unwinding property is superior to 23. In addition, Example No. 3 to 8, no. 13 to 16, no. 19 to 21, and no. In Nos. 24 to 26, the maximum value of the Si concentration by the high-frequency glow discharge optical emission spectrometry satisfies the range of the present invention. 9, 10, 17, 22 and No. Compared with No. 27, the anko discoloration inhibiting property is excellent.

Second Test Example The second test example is an example of a sample in which the winding method of the coil and the number of turns of the even layer are changed for the LWC having a constant mass and the number of turns of the odd layer. Table 3 shows the LWC mass and the number of coil turns for coil types E, F, and G having different coil winding methods or even-numbered layer winding numbers. The type G coil is wound by the conventional winding method shown in FIG. Table 4 shows the results of the unwinding test and the anko discoloration test for these samples.

  As shown in Table 4, Example No. 29 to 31, and In Nos. 34 to 36, the maximum value of the Si concentration by the high-frequency glow discharge optical emission spectrometry satisfies the range of the present invention. 28, 33 and no. Unwinding property is superior to 38. In addition, Example No. 29-31, no. 34 to 36, and Comparative Example No. In Nos. 39 to 41, since the maximum value of the Si concentration by the high-frequency glow discharge emission spectroscopic analysis satisfies the range of the present invention, Comparative Examples No. Compared to 32, 37, and 42, it has excellent anko discoloration suppression.

  In Comparative Example No. In Nos. 39 to 41, although the maximum value of Si concentration by high-frequency glow discharge optical emission spectrometry satisfies the range of the present invention, the winding method is not specified in the present invention and is wound by a conventional winding method. Since it is an LWC, the winding method is the one defined in the present invention. 29 to 31, and Unwinding property was inferior to 34 to 36.

Third Test Example Among the LWCs of the coil type A used in the first test example, Example No. 1 in which the maximum value of Si concentration by high-frequency glow discharge emission spectrometry was 1.5 atomic%. About 5 LWC, it piled up on the wooden pallet in 3 steps | paragraphs, and the unwinding test was implemented in order of the upper stage, the middle stage, and the lower stage.

  In the third test example, the coil located in the lower stage is subjected to a large contact load with the cushioning material due to the mass of the other level wound coil mounted above, and unwinding is disadvantageous. However, Example No. Since the maximum value of the Si concentration by the high frequency glow discharge emission spectroscopic analysis method of the LWC No. 5 satisfies the range of the present invention, the unwinding properties of the upper, middle and lower LWCs were good. Therefore, the LWC of the present invention has good unwinding properties even when stacked as a three-stage coil.

DESCRIPTION OF SYMBOLS 1,101: Copper pipe, 2,102: Bobbin, 2a, 102b: Side plate, 2b, 102a: Inner cylinder, 11: Pallet, 12: Polyethylene sheet, 13: Cushion material, 14: Resin film, 16: Three-stage coil , 17: (polyethylene) bag, 110: LWC (coil), 21: start end, 22, 112: copper tube portion, 23, 113: end, 103: rotating device (vertical decoiler), 104: rotating device (horizontal type) Uncoiler), 105: liner, 106: copper band, 107: turntable, 111, 31, 41: winding start part, 114: stand, 115: guide

Claims (6)

In the level-wound coil that is placed so that the coil axis direction is vertical and the winding start portion is on the upper side and is unwound from the inside, the copper or copper alloy tube constituting the level-wound coil is made of silicon oil on its outer surface. The maximum value of the Si concentration in the surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by high frequency glow discharge optical emission spectrometry is 0.3. The level-wound coil is formed by aligning and winding the copper or copper alloy tube to form a first layer coil, and then forming a second layer coil on the first layer coil. Fit in the recess between the copper or copper alloy tubes on the outer surface of the eye coil and align winding, and then, in the same manner, arrange the third layer coil and the subsequent coils on the second layer coil in sequence. The number of turns of the even-numbered coil is (n-1), where n is the number of turns of the odd-numbered coil, and the winding direction of the odd-numbered coil and the even-numbered layer. A level-wound coil characterized in that the winding directions of the eye coils are opposite to each other. In the level-wound coil that is placed so that the coil axis direction is vertical and the winding start portion is on the lower side and is unwound from the inside, the copper or copper alloy tube constituting the level-wound coil is made of silicon oil on its outer surface. The maximum Si concentration in the surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by high-frequency glow discharge optical emission spectrometry is 0. 3 to 30 atomic%, and the level wound coil is formed by winding the copper or copper alloy tube in an aligned manner to form a first layer coil, and then a second layer coil is formed on the first layer coil. Place the concave portion between the copper or copper alloy tubes on the outer surface of the layer coil and the adjacent windings on both sides thereof, and thereafter, in the same manner, sequentially place the third layer coil and the subsequent coils on the second layer coil. Adjustment The number of turns of the even-numbered coil is (n + 1), where n is the number of turns of the odd-numbered coil. A level-wound coil characterized in that the winding direction of the coil in the layer is opposite to each other. In the level-wound coil that is placed so that the coil axial direction is vertical and is unwound from the inside, the copper or copper alloy tube constituting the level-wound coil is coated with oil containing silicon oil on its outer surface It is annealed, and the maximum value of the Si concentration in the surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by high-frequency glow discharge optical emission spectrometry is 0.3 to 30 atomic%, The level-wound coil is formed by aligning the copper or copper alloy tube to form a first layer coil, and then a second layer coil is formed on the first layer coil, and a winding start end of the first layer coil is formed. Place the coil on the outer surface of the first layer coil between the copper or copper alloy tube and the outside thereof so as to be fitted in the recess between the copper or copper alloy tube of the last winding and the immediately preceding winding. Thereafter, in the same manner, a third layer coil and a plurality of layers of the subsequent coils are sequentially wound on the second layer coil, and when the number of turns of the odd-numbered coil is n, A level-wound coil, wherein the number of turns of the even-numbered coil is n, and the winding direction of the odd-numbered layer coil and the winding direction of the even-numbered layer coil are opposite to each other. The level-wound coil is placed on the pallet in one or more stages so that the coil axis direction is vertical and the winding start portion is on the upper side, and the entire one-stage or multi-stage level-wound coil is made of resin. The copper or copper alloy tube that is wrapped in a bag made of plastic and is wound tightly around the outside with a belt-shaped resin film, and the level-wound coil is coated with an oil containing silicon oil on its outer surface, and then annealed The maximum value of the Si concentration in the surface layer part from the surface of the copper or copper alloy tube to 20 nm when analyzed by high-frequency glow discharge emission spectrometry is 0.3 to 30 atomic%, In the level wound coil, the copper or copper alloy tube is wound in an aligned manner to form a first layer coil, and then a second layer coil is formed on the first layer coil. A plurality of layers in which the coil is inserted into the recesses between the copper or copper alloy tubes on the surface and aligned and wound in the same manner, and the third layer coil and the subsequent coils are sequentially aligned and wound on the second layer coil. If the number of turns of the odd-numbered coil is n, the number of turns of the even-numbered coil is (n-1), and the winding direction of the odd-numbered coil and the even-numbered coil A package of level-wound coils, wherein the winding directions of the coils are opposite to each other. The level-wound coil is placed on the pallet in one or more stages so that the coil axial direction is vertical and the winding start portion is on the lower side, and the entire one-stage or multi-stage level-wound coil is The copper or copper alloy tube constituting the level-wound coil is coated with oil containing silicon oil on the outer surface, wrapped in a resin bag and further wound tightly by a belt-shaped resin film on the outside. It is annealed, and the maximum value of the Si concentration in the surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by high-frequency glow discharge optical emission spectrometry is 0.3 to 30 atomic%, The level-wound coil forms a first layer coil by aligning and winding the copper or copper alloy tube, and then a second layer coil is formed on the first layer coil. Place the concavity between the copper or copper alloy tubes on the surface and arrange them next to each other, and then arrange and wind the third layer coil and the subsequent coils on the second layer coil in the same manner. The number of turns of the even-numbered coil is (n + 1), where n is the number of turns of the odd-numbered coil, and the winding direction of the odd-numbered coil and the even-numbered-layer coil are A package of level-wound coils, wherein the coil winding directions are opposite to each other. The level-wound coil is placed on the pallet in one or more stages so that the coil axis direction is vertical and the winding start part is on the upper side or the lower side, and the level-wound coil of the one-stage or multi-stage level-wound coil The whole is wrapped in a resin bag, and the outside is tightly wound with a strip-shaped resin film. The copper or copper alloy tube constituting the level-wound coil is coated with oil containing silicon oil on its outer surface. And the maximum Si concentration in the surface layer portion from the surface of the copper or copper alloy tube to 20 nm when analyzed by high frequency glow discharge optical emission spectrometry is 0.3 to 30 atomic%. The level-wound coil is formed by aligning and winding the copper or copper alloy tube to form a first layer coil, and then forming a second layer coil on the first layer coil. Arranged on the outer side of the copper or copper alloy tube on the outer surface of the first layer coil and outside thereof so as to be fitted in the concave portion between the copper or copper alloy tube of the last winding of the first layer coil and the immediately preceding winding. Then, in the same manner, the third layer coil and the subsequent coils are sequentially wound on the second layer coil, and a plurality of layers of coils are laminated. N is the number of turns of the even layer coil, and the winding direction of the odd layer coil is opposite to the winding direction of the even layer coil. Coil package.

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