JP2015000433A - Construction method of airtight aluminum piping structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for easily constructing an airtight aluminum piping structure having high heat transfer efficiency and pressure-resistant strength, without being limited by a size and a shape of the structure at a construction site.SOLUTION: The construction method of the airtight aluminum piping structure comprises (1) a recoil step of forming an aluminum long flat tube (for example, a multiple hole flat tube) wound in a coil shape into a substantially linear shape by straightening and recoiling the aluminum long flat tube using a straightener in a construction site, (2) a working step of obtaining a flat tube member having the desired length by cutting the flat tube of the substantially linear shape and tip working (siding) and/or bending working the cut flat tube and (3) a brazing step of forming the airtight aluminum piping structure enabling fluid to flow in its inside by joining the flat tube member and a header member by brazing.

Description

  The present invention relates to a method for constructing an airtight aluminum piping structure that can be constructed at a construction site, and more specifically, an airtight and high heat transfer efficiency that is not limited by the size or shape of the structure. The present invention relates to a construction method for a porous aluminum piping structure.

  Air-tight piping structures are widely used for the purpose of heat dissipation or heat recovery, for example, as air conditioners or heat exchangers for ice makers.

  When building a large structure for airtight piping that exceeds the size that can be manufactured in a factory, for example, outdoors, such as at a construction site, a metal or resin O pipe is combined with various joints, welding and brazing. It is necessary to use metal bonding such as attachment or flare bonding, which makes the operation extremely difficult. Further, in order to ensure sufficient airtightness in the finally obtained airtight pipe large structure, high skill is required for joining.

  On the other hand, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 9-79722), when not in use, the volume of the secondary refrigerant circulation pipe is reduced to enable downsizing during storage, and transportation during installation and removal. An ice rink ice-making heat exchanger has been proposed that facilitates this.

  The heat exchanger for ice making disclosed in Patent Document 1 has a heat exchanger unit in which a plurality of flexible hoses are arranged in parallel, and the flexible hoses have a cylindrical canvas as a core material. A flexible material in which a rubber material is arranged around, or a flexible material in which the outer periphery of the rubber material is further covered with a canvas is used. When the secondary refrigerant supplied to the flexible hose is stopped, the internal pressure is eliminated, the flexible hose is crushed and flattened, and the ice-making heat exchanger is downsized.

  Further, for example, Patent Document 2 (Japanese Patent Laid-Open No. 2009-121726) proposes a cooling / heating panel piping device that is thin, can be easily constructed on a floor base material, has good workability, and is inexpensive. Yes.

  The cooling / heating panel piping device disclosed in Patent Document 2 is connected to a resin heat exchange pipe through which heat exchange fluid flows, and a heat exchange fluid supply side and a return side of the heat exchange pipe, respectively. It has a radiant cooling and heating panel with a flat resin tube. Although the said air-conditioning panel piping apparatus is formed thinly, it is supposed that the flow volume of the fluid for heat exchange can fully be ensured by using a flat tube.

Japanese Patent Laid-Open No. 9-79722 JP 2009-121726 A

  However, in the heat exchanger for ice making disclosed in Patent Document 1, canvas and rubber materials are used for the heat exchanger unit, and in the piping device for an air conditioning panel disclosed in Patent Document 2, A resin material is used for the heat exchange pipe, it is difficult to perform efficient heat dissipation or heat recovery, and the pressure strength is low, so that the heat source apparatus to be combined is restricted. In addition, a method of easily constructing an airtight pipe structure using an aluminum pipe at a construction site, which is optimal for a building structure for heat dissipation or heat recovery with high heat transfer efficiency and high pressure resistance, It is not found in the prior art.

  In view of the problems in the prior art as described above, the object of the present invention is to easily provide an airtight aluminum piping structure having high heat transfer efficiency without being limited by the size and shape of the structure at the construction site. It is to provide a method of construction.

  In order to achieve the above object, the present inventor conducted extensive research on the construction method of an airtight aluminum piping structure having high heat transfer efficiency at a construction site, and as a result, a flat tube member made of aluminum and a header member on the piping Using this combination, it was found that it is extremely effective to construct a structure by brazing a flat tube member and a header member, and the present invention has been achieved.

That is, the present invention
(1) A recoil process in which a long aluminum flat tube (for example, a multi-hole flat tube) wound in a coil shape is straightened and recoiled by a straightening device at a construction site so as to be substantially linear. When,
(2) A processing step of cutting the substantially straight flat tube to obtain a flat tube member having a desired length by cutting the tip (sizing) and / or bending.
(3) A brazing step of forming an airtight aluminum piping structure capable of flowing a heat exchange fluid (refrigerant) inside by joining the flat tube member and the header member by brazing; ,
Having
The construction method of the airtight aluminum piping structure characterized by these is provided.

  In the construction method of the airtight aluminum piping structure according to the present invention, it is preferable to use a Nolock rock brazing method using a high frequency brazing machine for brazing in the brazing step (3).

  Moreover, in the construction method of the airtight aluminum piping structure of the present invention, after the brazing step (3), further using the differential pressure method or the handy leak tester, the flat tube member and the header member It is preferable to include a leak test step (4) for confirming whether or not there is a leak in the joint, and when the leak is found in the joint, the brazing step (3) is performed again.

  Further, the present invention is characterized by comprising a substantially straight aluminum flat tube member and a header member, wherein the flat tube member and the header member are joined by brazing. The present invention also relates to an airtight aluminum piping structure constructed by the construction method of the airtight aluminum piping structure of the invention.

Specifically, the airtight aluminum piping structure of the present invention is
A fluid inlet header member;
A fluid inflow side flat tube member in airtight communication with the fluid inlet side header member;
A turn header member in airtight communication with the fluid inflow side flat tube member;
A fluid outflow side flat tube member in airtight communication with the turn header member;
A fluid outlet header member in airtight communication with the fluid outflow side flat tube member;
Including at least a unit.

  The airtight aluminum piping structure of the present invention is a joint member that can connect the fluid inflow side flat tube member and / or the fluid outflow side flat tube member, or the fluid inlet side header member and / or the fluid outlet. It is preferable to provide a joint member that can connect the side header member.

  As a result, the unit can be freely expanded and contracted in the two-dimensional direction and its shape can be changed, and the airtight aluminum piping structure of the present invention can be designed freely according to the space and shape of the construction site. it can.

  According to the present invention, there is provided a method for easily constructing an airtight aluminum piping structure having high heat transfer efficiency and high pressure strength without being limited by the size and shape of the structure at a construction site. Can do.

It is a schematic block diagram of the airtight aluminum piping structure which concerns on one Embodiment of this invention. It is the sectional view on the AA line in FIG. FIG. 2 is a partial schematic perspective view of an X portion in FIG. 1 (that is, a portion where a flat tube member 2 and a header member 4 communicate with each other). FIG. 4 is a partially schematic exploded perspective view showing a relationship between the header member 4 and an end plug for the header member 4 used for closing the open end of the header member 4. FIG. 2 is a partial schematic exploded perspective view of a Y portion in FIG. 1 (that is, a portion where a turn header member 6 and a flat tube member 2 communicate with each other). It is the BB sectional view taken on the line in FIG. 4 is a partial schematic perspective view showing a joint portion in which a header member 4 and a header member 4 are connected by a joint member 8. FIG. 3 is a schematic perspective view of a joint member 8. FIG. It is CC sectional view taken on the line in FIG. 1 is a partial schematic perspective view showing a joint portion in which a flat tube member 2 and a flat tube member 2 are connected by a joint member 10. FIG. 1 is a schematic perspective view of a joint member 10. It is the DD sectional view taken on the line in FIG. 4 is a schematic cross-sectional view in a direction substantially perpendicular to the longitudinal direction of the flat tube member 2. FIG. It is a schematic block diagram of the modification of the airtight aluminum piping structure of this invention. It is the EE sectional view taken on the line in FIG. It is an external appearance photograph of an example of a straightener. It is the photograph which showed the use condition of the straightener shown in FIG. It is a schematic diagram for demonstrating the concept of tip processing (sizing). It is the schematic which shows the example of a brazing material shape.

  Hereinafter, representative embodiments of the construction method of the airtight aluminum piping structure of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these. In the following description, the same or corresponding parts are denoted by the same reference numerals, and redundant description may be omitted. Further, since the drawings are for conceptually explaining the present invention, the dimensions and ratios of the components shown may be different from the actual ones.

[A] Airtight aluminum piping structure

  FIG. 1 is a schematic configuration diagram of an airtight aluminum piping (large sized) structure according to an embodiment of the present invention. The airtight aluminum piping structure 1 includes an aluminum (multi-hole) flat tube member 2, a pipe-like header member 4, and a turn header member 6.

  Further, when it is desired to add the header member 4, a joint member 8 for the header member 4 (for example, a substantially pipe shape) is used, and when it is desired to add the flat tube member 2, the joint member 10 for the flat tube member 2 (for example, a substantially flat shape). Shape) is used. The inner diameter (inner circumference) of the joint member 8 is substantially the same as or slightly larger than the outer diameter of the header member 4. Further, the inner diameter (inner circumference) of the joint member 10 is substantially the same as or slightly larger than the outer diameter (outer circumference) of the flat tube member 2. The joint material is preferably, for example, A6063-T5.

  Next, FIG. 2 is a cross-sectional view taken along line AA in FIG. The header member 4 has a hollow with a substantially circular cross section, and is installed on the inlet side and the outlet side of the heat exchange fluid (refrigerant). That is, in FIG. 3, it has the fluid inlet side header member 4 located above, and the fluid outlet side header member 4 located below. FIG. 3 is a partial schematic perspective view of a portion X in FIG. 2 (that is, a portion where the flat tube member 2 and the header member 4 communicate with each other).

  Each of the upper and lower header members 4 in FIG. 3 is provided with an opening (not shown) that matches the shape of the distal end portion of the flat tube member 2, and the fluid inflow side flatness is formed in the upper opening. By inserting / joining the pipe member 2 and inserting / joining the fluid outflow side flat tube member 2 in the lower opening, the two header members 4 and the two flat tube members 2 communicate with each other.

  The flat tube member 2 communicated with one of the header members 4 installed on the inlet side and the outlet side of the fluid (refrigerant) is provided with a loose vent immediately before being inserted into the header member 4 ( That is, it is preferable to have a bent structure. In FIG. 3, the fluid outflow side flat tube member 2 positioned below has a bent portion.

  By doing so, as shown in FIG. 2, the flat tube member 2 can be installed almost linearly without being bent halfway, which is advantageous in terms of space. In addition, the arrow shown in FIG. 3 has shown an example of the flow direction of a fluid (refrigerant).

  FIG. 4 is a partial schematic exploded perspective view for showing the relationship between the header member 4 and the end plug for the header member 4 used for closing the open end of the header member 4. For the end plug 20, for example, a press-molded product of a single-side clad / brazing sheet can be used.

  By driving the end plug 20 into the open end of the header member 4, the open end can be easily sealed. Of course, the header member 4 and the end plug 20 may be joined by brazing or the like.

  Although the material of the header member 4 and the end plug 20 is not specifically limited, For example, it is preferable to use various aluminum alloys, such as A6063-T5. The header member 4 and the end plug 20 are preferably laminated or painted by a conventional method after construction.

  When the airtight aluminum piping structure 1 of the present embodiment is assumed to be in a severe corrosive environment such as embedded in concrete, the header member 4, the turn header member 6, each end plug 20, 32, each joint 8 , 10 are preferably subjected to anticorrosion treatment. In this case, it is conceivable to apply a zincate treatment to each member in advance, or to paint all around with an epoxy paint after brazing.

  The zincate treatment is a treatment in which the surface of the aluminum electrode is immersed in an alkaline solution (zincate solution) such as zinc oxide. Thereby, while removing the aluminum oxide film which exists on the surface of an aluminum material, aluminum can be substituted by zinc and a zinc film can be formed on the surface of an aluminum material.

  FIG. 5 is a partial schematic exploded perspective view of a Y portion in FIG. 1 (that is, a portion where the turn header member 6 and the flat tube member 2 communicate with each other). 6 is a cross-sectional view taken along line BB in FIG. The turn header member 6 has a main body 30 and two plugs 32.

  By connecting the flat tube member 2 to the main body portion 30 and fitting the plugs 32 to open ends located on both side surfaces of the main body portion 30, a turn header joint portion made of the turn header member 6 is formed. Again, the main body 30 and the plug 32 may be joined by brazing or the like.

  The main body 30 is provided with an opening (not shown) that matches the shape of the distal end portion of the flat tube member 2, and the flat tube member 2 is inserted into the opening as shown in FIG. By joining, the main-body part 30 and the flat tube 2 member are mutually connected.

  Although the material of the turn header member 6 is not particularly limited, for example, an aluminum alloy such as A6063-T5 is preferably used. It is preferable that the flow path cross-sectional area of the turn header member 6 is equal to or greater than the flow path cross-sectional area of the flat tube member 2.

  As described above, the airtight aluminum piping structure 1 of the present embodiment includes a fluid inlet side header member 4 (see the upper part of FIG. 3) and a fluid inlet side flattened fluidly communicating with the fluid inlet side header member 4. A pipe member 2 (see the upper part of FIG. 3), a turn header member 6 (see FIGS. 1, 2, 5 and 6) in airtight communication with the fluid inflow side flat tube member 4, and a turn header member 6 A fluid outlet flat tube member (see the lower part of FIG. 3) that communicates airtightly with the fluid outlet header member (see the lower part of FIG. 3) that airtightly communicates with the fluid outlet flat tube member. Includes units to be equipped. FIG. 2 also shows this unit.

  Next, FIG. 7 is a partial schematic perspective view showing a joint portion in which the header member 4 and the header member 4 are connected by the joint member 8. 8 is a schematic perspective view of the joint member 8, and FIG. 9 is a cross-sectional view taken along the line CC in FIG.

  The joint member 8 has an inner wall 40 having an opening. By joining the end portion of the header member 4 to the inner wall 40 and joining, it is possible to easily form a joint portion having excellent airtightness. it can. As shown in FIG. 7, the joint portion is formed by inserting and communicating the header members 4 from both sides of the joint member 8.

  FIG. 10 is a partial schematic perspective view showing a joint portion in which the flat tube member 2 and the flat tube member 2 are connected by the joint member 10. 11 is a schematic perspective view of the joint member 10, and FIG. 12 is a cross-sectional view taken along the line DD in FIG. As shown in FIG. 12, the joint member 10 has an inner wall 40 having an opening.

  By joining the end portion of the flat tube member 2 in contact with the inner wall 40, a joint portion having excellent airtightness can be easily formed. In addition, the joint part shown in FIG. 10 is formed by inserting and communicating the flat tube member 2 from both sides of the joint member 10, respectively.

  Thus, the airtight aluminum piping structure 1 of the present embodiment includes the fluid inflow side flat tube member 2 (see the upper side of FIG. 3) and the fluid outflow side flat tube member 2 (see the lower side of FIG. 3). A coupling member 10 that can be connected, and a coupling member 8 that can connect the fluid inlet side header member 4 (see the upper side of FIG. 3) and the fluid outlet side header member 4 (see the lower side of FIG. 3). 2 allows the unit shown in FIG. 2 to freely expand and contract in the two-dimensional direction and change its shape, and to design the airtight aluminum piping structure 1 freely according to the space and shape of the construction site. it can.

  Furthermore, FIG. 13 is a schematic sectional view in a direction substantially perpendicular to the longitudinal direction of the flat tube member 2 in the present embodiment. The flat tube member 2 in the present embodiment has a structure in which a plurality of through holes 50 extending in the longitudinal direction are formed inside, and a fluid (refrigerant) can flow through the through holes 50.

  Since the flat tube member 2 has such a structure, it has a large internal surface area, exhibits extremely high heat transfer efficiency, and also has high pressure strength, and is intended for heat dissipation or heat recovery. It can be suitably used for construction structures.

  As the material of the flat tube member 2, any of conventionally known various aluminum and aluminum alloys can be used as long as the effects of the present invention are not impaired. For example, an aluminum alloy such as A1050-H112 is preferably used. Further, when the flat tube member 2 is used in a corrosive environment or the like, zinc (Zn) spraying may be applied to the surface in order to improve corrosion resistance, adjust potential, or the like.

  The airtight aluminum piping structure 1 (refer to FIG. 1) of the present embodiment formed by each of the above-described constituent members ensures airtightness and pressure resistance that can withstand fluid (refrigerant) reflux inside the piping. Therefore, it can be suitably used as a construction structure for the purpose of heat dissipation or heat recovery.

  Moreover, since the magnitude | size and shape of the airtight aluminum piping structure 1 can be arbitrarily set by combining the flat pipe member 2 from which length differs suitably, the airtight aluminum piping structure of this embodiment The object 1 can be applied to various environments and purposes.

  The airtight aluminum piping structure 1 includes, for example, an evaporator device disposed under ice on a skating rink, a radiation / radiation cooling heat radiation device, a floor heating heat radiation device, a chimney placed under a floor or a ceiling of a large construction, etc. It can be used for applications where high thermal conductivity is advantageous in heat dissipation or heat recovery, such as a heat recovery device.

<Modification>
FIG. 14 is a schematic configuration diagram of a modified example of the airtight aluminum piping structure 100 according to the embodiment of the present invention. FIG. 15 is a cross-sectional view taken along line EE in FIG. The airtight aluminum piping structure 100 of this modification has the flat tube member 2 and the header member 4 like the said embodiment.

  When the airtight aluminum piping structure 100 is assumed to be in a severe corrosive environment such as embedded in concrete, it is preferable that the header member and the end plug are subjected to anticorrosion treatment. In this case, it is conceivable to apply a zincate treatment to each member in advance, or to paint all around with an epoxy paint after brazing.

  The airtight aluminum piping structure 100 of this modification can be suitably used as an oval link for a speed skate truck, for example.

[B] Construction method of airtight aluminum piping structure

  The airtight aluminum piping structure 1 according to the embodiment can be constructed by a construction method including a recoil process (1), a processing process (2), and a brazing process (3). Hereinafter, it demonstrates for every process.

(1) A recoil process in which a long aluminum flat tube wound in a coil shape is straightened by a straightener and recoiled at a construction site so as to be substantially linear.

  As a pre-process of the recoil process, an aluminum long flat tube wound in a coil shape (that is, an aluminum long flat tube (a flat tube member 2 before being cut is continuous)) Prepare a roll).

  The long flat tube can be formed by extruding aluminum, and after the extruding process, it can be wound into a coil to obtain a wound body. By using such a wound body, a long flat tube reaching several tens of meters can be easily used at a construction site.

  When the airtight aluminum piping structure 1 of the above embodiment is applied as an evaporator device placed under ice on a hockey / curling link, for example, a wound body of 45 to 135 m / coil can be used. .

  Moreover, when applying the airtight aluminum piping structure 1 of the said embodiment, for example as an evaporator apparatus arrange | positioned under the ice of a speed skating link, it is possible to use a winding body of 100 to 200 m / coil. it can.

  For example, a straightener shown in FIG. 16 can be used for straightening (recoiling) a long flat tube wound in a coil shape. FIG. 16 is an appearance photograph showing an example of a straightening device that can be used to straighten (recoil) a wound body of an aluminum long flat tube in the present embodiment.

  In this straightener, as shown in FIG. 17, the end of the long flat tube is taken out from the wound body and passed through the guide of the straightener, so that the bent long flat tube is straightened. Can be fixed. As such a straightening device, for example, a guide or the like of an existing trolley wire straightening device can be modified and used for a long flat tube.

  As the material of the long flat tube, various conventionally known aluminum and aluminum alloys can be used as long as the effects of the present invention are not impaired. For example, aluminum alloys such as A1050-H112 can be used, and In the case where the long flat tube is used in a corrosive environment or the like, the point that the zinc (Zn) spraying may be performed depending on the surface is intended in order to improve the corrosion resistance and adjust the potential as described in the above embodiment. It is as follows.

(2) A processing step of obtaining a flat tube member having a desired length by cutting the substantially straight flat tube and performing tip processing and / or bending processing;

  The long flat tube recoiled by the recoil process (1) is then cut according to the size and shape of the airtight aluminum piping structure to be constructed, and the flat tube member 2 is obtained. For example, by cutting a depth of about 80% of the outer wall thickness of the long flat tube and bending the cut portion, the flat tube member 2 is cut while suppressing cross-sectional deformation and generation of burrs. Can be obtained.

  In order to facilitate joining with various header members, it is preferable to perform tip processing (sizing) on the tip portion of the cut flat tube member 2. FIG. 18 is a schematic diagram for explaining the concept of tip processing. The tip processing here is achieved by applying stress from four directions around the flat tube member 2 through a jig to obtain a desired tip shape.

  When the piping structure has a relatively large bend R like the airtight aluminum piping structure 100 of the above modification, the flat tube member 2 may be bent as necessary. In addition, when the bending R is large, it is not necessary to consider the influence of the bending process on the reliability of the flat tube member 2.

(3) A brazing process for forming an airtight aluminum piping structure capable of flowing a fluid therein by joining the flat tube member and the header member by brazing.

  For joining the flat tube member 2 and various header members (the header member 4 and the turn header member 6), it is preferable to use a Nokolok brazing method using a commercially available small high-frequency brazing machine.

  The Nocolok brazing method is a method in which brazing heating is performed using a fluoride-based flux called Nocolok flux. In the brazing method, stable brazing properties can be obtained relatively easily without requiring expensive equipment. In addition, it is a great advantage that the residue of the fluoride flux adhered to the product after brazing is not corrosive to aluminum.

  Fill the joints of various header members (header member 4, turn header member 6) or joint portion of the flat tube member 2 into the joint portion of various header members or flat tube member 2, After the flux is applied to the joint, the joint is heated using a small high-frequency brazing machine, so that joining with airtightness can be easily achieved.

  19A, 19B, and 19C are schematic views showing the shape of the brazing material used for joining the flat tube member 2 and various header members. That is, (a) shows the shape of the brazing material used for joining the flat tube member 2 and the header member 4, and (b) shows the shape of the brazing material used for joining the flat tube member 2 and the joint member 10. Show. (C) shows the shape of the brazing material used for joining the flat tube member 2 and the turn header member 6 (main body portion 30).

  As a material of the brazing material, a conventionally known material can be used, for example, A4045 can be used. Further, the outer shape of the brazing material may be appropriately set according to the shape of the joint portion, and it is preferable to calculate the filling amount of the brazing material based on the design void volume of the joint portion.

  In the joining of the joint member 8 and the header member 4 and the joining of the joint member 10 and the flat tube member 2, the flat tube member 2 and various header members (header member 4, turn header member 6) and It may be performed in the same manner as the joining.

(4) Leak test process for confirming the presence or absence of leak at the joint between the flat tube member and the header member using a differential pressure method or a handy leak tester (optional)

  In the construction method of the present embodiment, after the brazing step (3), the presence or absence of leakage at the joint between the flat tube member 2 and the various header members is confirmed using a differential pressure method or a handy leak tester. It is preferable to perform the brazing step (3) again when a leak test step is included and a leak is observed at the joint.

  It is preferable to perform a leak test on the brazed joint (sealed structure) and, if a leak is observed, repeat the joining and repeat the brazing step (3) until sufficient airtightness is ensured. .

  As a leak test method, for example, a differential pressure method can be used. In addition, after sealing a micromolecular gas such as helium in a sealed structure including a joint, perform a leak test of the micromolecular gas using a leak tester on the joint to inspect the airtightness of the sealed structure. You can also.

  As mentioned above, although typical embodiment of this invention was described, this invention is not limited only to these, Various design changes are possible and these design changes are all contained in the technical scope of this invention. It is.

1, 100 ... airtight aluminum piping structure,
2 ... flat tube member,
4 ... Header member,
6 ... Turn header member,
8: Joint member,
10: Joint member,
20 ... End plug,
30 ... main body,
32 ... Plug,
40 ... inner wall,
50 ... through hole.

Claims (6)

(1) A recoil process in which a long flat tube made of aluminum wound in a coil shape is straightened by a straightener and recoiled at a construction site;
(2) A processing step of obtaining a flat tube member having a desired length by cutting the substantially straight flat tube and performing tip processing and / or bending processing;
(3) A brazing step of forming an airtight aluminum piping structure capable of flowing a fluid therein by joining the flat tube member and the header member by brazing;
Having
Construction method of airtight aluminum piping structure characterized by In the brazing step (3), using a Nocolok brazing method using a high frequency brazing machine,
The construction method of the airtight aluminum piping structure of Claim 1 characterized by these. After the brazing step (3), a leak test step (4) for confirming whether or not there is a leak in the joint portion between the flat tube member and the header member using a differential pressure method or a handy leak tester Have
If leakage is found in the joint, the brazing step (3) is performed again.
The construction method of the airtight aluminum piping structure of Claim 1 or 2 characterized by these. A substantially straight aluminum flat tube member and a header member, wherein the flat tube member and the header member are joined by brazing;
Airtight aluminum piping structure characterized by A fluid inlet header member;
A fluid inflow side flat tube member in airtight communication with the fluid inlet side header member;
A turn header member in airtight communication with the fluid inflow side flat tube member;
A fluid outflow side flat tube member in airtight communication with the turn header member;
A pipe-like header member for fluid outlet in airtight communication with the fluid outflow side flat tube member;
Including a unit comprising at least
The airtight aluminum piping structure according to claim 4. A joint member capable of connecting the fluid inflow side flat tube member and / or the fluid outflow side flat tube member, or a joint member capable of connecting the fluid inlet side header member and / or fluid outlet side header member; ,
The airtight aluminum piping structure according to claim 5.