WO2011142180A1 - Pipe coupling method, pipe extension jig, and pipe extension method using pipe extension jig - Google Patents

Pipe coupling method, pipe extension jig, and pipe extension method using pipe extension jig Download PDF

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Publication number
WO2011142180A1
WO2011142180A1 PCT/JP2011/057214 JP2011057214W WO2011142180A1 WO 2011142180 A1 WO2011142180 A1 WO 2011142180A1 JP 2011057214 W JP2011057214 W JP 2011057214W WO 2011142180 A1 WO2011142180 A1 WO 2011142180A1
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WO
WIPO (PCT)
Prior art keywords
pipe
tube expansion
expanded
expansion
open end
Prior art date
Application number
PCT/JP2011/057214
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French (fr)
Japanese (ja)
Inventor
篤司 鹿
Original Assignee
株式会社日立プラントテクノロジー
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Priority to SG2012082236A priority Critical patent/SG185468A1/en
Publication of WO2011142180A1 publication Critical patent/WO2011142180A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/02—Welded joints
    • F16L13/0209—Male-female welded joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/08—Tube expanders
    • B21D39/20—Tube expanders with mandrels, e.g. expandable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/06—Tubes

Definitions

  • the present invention relates to a method of connecting pipes used for air conditioning and the like, a tube expansion jig used in the method, and a tube expansion method using the tube expansion jig.
  • One outdoor unit and a plurality of indoor units included in the package type air conditioner are connected by a pipe such as a copper pipe, and heat is exchanged indoors and outdoors through the pipe.
  • a pipe such as a copper pipe
  • Each copper pipe which comprises piping is extended by brazing a junction location. Since copper piping is easily oxidized, an oxide film is formed on the inner and outer circumferences of the piping due to heating during brazing.
  • the oxide film is peeled off by a refrigerant or the like flowing in the pipe, and if the peeled oxide film reaches the refrigerator, there is a possibility of causing a malfunction such as a failure.
  • Patent Document 1 various means for preventing an oxide film from being formed inside the pipe during brazing have been studied and disclosed in Patent Document 1 and Patent Document 2.
  • the means disclosed in Patent Document 1 is to temporarily assemble a pipe, replace the air present in the pipe with an inert gas, and then heat and braze the connected portion.
  • the refrigerant circuit of the outdoor unit is previously filled with an inert gas such as nitrogen.
  • the inert gas filled in the refrigerant circuit is released into the piping, the air inside the piping is replaced with the inert gas, and then the The process moves to the attaching process.
  • the means disclosed in Patent Document 2 is to perform brazing by replacing the air present in the pipe with an inert gas, as in the pipe connection method disclosed in Patent Document 1.
  • a joint is used for connection. Specifically, a joint having substantially the same diameter as the pipe to be connected is prepared. A convex stopper is formed near the center of the outer periphery of the joint. The end of the pipe to be connected is expanded, and the expanded portion is inserted from both ends of the joint. In this temporarily assembled state, the air inside the pipe is replaced, and the pipe brought into contact with the stopper is brazed.
  • JP-A-7-190575 (claims, paragraphs 0014, 0017, etc.) JP 7-185804 A (paragraphs 0002, 0015 to 0019, etc.)
  • Patent Document 1 it is necessary to first fill the refrigerant circuit with an inert gas in advance. Moreover, when the pipe length becomes long, there is a possibility that the filled inert gas may be insufficient. Further, in the means disclosed in Patent Document 2, it is necessary to prepare a cylinder filled with an inert gas for allowing the inert gas to flow into the pipe. In addition, since a joint is used when connecting pipes, it is necessary to provide a joint with a corresponding diameter for each pipe to be connected, and if the pipe or joint is distorted, There is also a problem that the joint cannot be used.
  • the worker reciprocates between the inlet and outlet of the inert gas in the pipe, and performs the pipe connection work while checking the replacement status of the inert gas.
  • the pipes after connection are assumed to be in various cases, but even in a general building, the height difference is 50 m and the pipe length is close to 100 m. It becomes a big burden in performing work.
  • the present invention provides a pipe connection method that solves the above-described problems, does not use separate parts for pipe connection, and can reduce the burden of reciprocating work required during gas filling.
  • the second object of the present invention is to provide a tube expansion jig used in a pipe connection method for achieving the above object, and to provide a tube expansion method using the tube expansion jig.
  • a pipe connection method is configured to close an open end of one pipe and open an end of the other pipe out of two pipes having a connection end and an open end.
  • an assembly step of inserting the connection end of the other pipe into the expanded connection end of the one pipe, and combustion from the partially expanded section toward the open end of the one pipe A gas replacement step for allowing gas to flow in and exhausting the air in the two piping from the partially closed open end of the other piping; and the contact in the one piping after the gas replacement step is completed.
  • the pipe expansion process ends the first pipe expansion process and the first pipe expansion process in which the connection end portion of the one pipe is uniformly expanded to form an equal expansion section. It is preferable to further include a second pipe expanding step of further expanding a part of the uniform pipe expanding part in the one pipe to form a partial pipe expanding part. By performing such stepwise pipe expansion, it is possible to prevent the connection end portion of the pipe from being damaged in the pipe expansion process.
  • the partial pipe expansion portion is formed below the one pipe.
  • the efficiency of gas replacement can be improved, and the rate of oxide film generation inside the pipe after the brazing process can be reduced.
  • the opening area of the open end is reduced, and the opening after being reduced is It is better to turn to the ground direction.
  • Such a characteristic method also contributes to reducing the rate of oxide film generation inside the pipe after the brazing step.
  • a tube expansion jig for achieving the above object includes a cone-shaped center member and a plurality of arranged on the outer periphery of the center member to form a cylindrical outer shape.
  • the pipe By moving in the direction of the central axis of the cone, the pipe is radially extruded to the outer peripheral side, and the pipe end is expanded to form a pipe expanding part, and the cylindrical outer peripheral side constituted by the pipe expanding block is A part of the expanded portion formed in the pipe is further outside by moving the center member in the direction of the center axis while being arranged so as to be able to contact and separate from the outer periphery.
  • the length of the partial pipe expansion block inserted in the pipe end is longer than the length of the pipe expansion block inserted in the pipe end.
  • the tube expansion method using the tube expansion jig according to the present invention includes a cone-shaped central member and a plurality of the central member arranged on the outer periphery of the central member to form a cylindrical outer shape, and the central member is formed into a cone.
  • the central member is formed into a cone.
  • the center member is moved in the direction of the central axis while being arranged so as to be able to contact and separate from the outer periphery, so that a part of the expanded portion formed in the pipe is further expanded outward.
  • It has an insertion process and the 2nd pipe expansion process which moves the central member, extrudes the pipe expansion block, and further expands a part of the uniform pipe expansion part, and forms a partial pipe expansion part.
  • FIG. 6 shows an arrangement form of the outdoor unit 50 and the indoor unit 52 in the package type air conditioner.
  • FIG. 6 shows an example in which an outdoor unit 50 arranged on the roof of a building and a plurality of indoor units 52 arranged on the first floor of the building are connected by a pipe 10.
  • the pipe connection method of the present invention is a method suitable for carrying out when connecting the pipes thus extended. 1st Embodiment which concerns on the piping connection method of this invention is described with reference to FIG. 1, FIG.
  • first pipe 10a and second pipe 10b two pipes (first pipe 10a and second pipe 10b) to be connected are prepared.
  • the first pipe 10a is a pipe (one pipe) connected to the outdoor unit 50 side, and the second pipe 10b.
  • the open end of the first pipe 10a is closed, and the open end of the second pipe 10b is partially closed.
  • the outdoor unit 50 is connected to the open end of the first pipe 10a, and the open end is in a closed state, so this state may be maintained.
  • a closing member 12 such as a cap may be disposed at the open end of the first pipe 10a as shown in FIG. 1 (Step B).
  • the partial closing member 14 may be disposed in the opening portion of the open end portion of the second pipe 10b to reduce the opening area of the open end portion.
  • a cap corresponding to the diameter of the second pipe 10b and having at least one through hole 16 may be disposed on the surface to be partially closed at the open end of the second pipe 10b.
  • the through-hole 16 is desirably provided in the cap so that when the cap is disposed on the surface to be partially closed, the through-hole 16 is disposed near the center of the surface.
  • the hole diameter of the through hole 16 depends on the diameter of the second pipe 10b to be connected, but may be about 9 mm if the diameter of the second pipe 10b is in the range of about 15 mm to 32 mm.
  • a path bending member 18 such as a so-called elbow is disposed in the through hole 16 so that the opening after the second pipe 10b is narrowed is directed in the ground direction.
  • a tube expansion jig 30 (see FIG. 3A, FIG. 3B, FIG. 3C, FIG. 3D, FIG. 4A, FIG. 4B, FIG. 4C, and FIG. 4D) is inserted into the connection end of the first pipe 10a. Expand the tube.
  • a tube expansion jig 30 used for tube expansion includes a central member 32 having a conical shape, and the central member 32.
  • the central member 32, the pipe expansion block 34, and the partial pipe expansion block 36 are all arranged on a block base 38 constituting the pipe expansion jig 30, and the block base 38 is used as a base point for movement and expansion.
  • the center member 32 moves in the direction of the center axis indicated by the arrow A in FIG. 3B by operating a handle (not shown).
  • the center member 32 has a conical shape, and the contact surface between the center member 32 and the tube expansion block 34 has a tapered shape. For this reason, when the center member 32 is pushed forward, the tube expansion block 34 arranged on the outer periphery of the center member 32 is pushed toward the outer periphery side (radial direction) of the center member 32.
  • the tube expansion block 34 has a cylindrical outer shape by combining a plurality of blocks (six in the example shown in the present embodiment). For this reason, the tube expansion block 34 is uniformly expanded at the connection end portion of the first pipe 10 a by being pushed toward the outer peripheral side with the movement of the center member 32, thereby forming the equal tube expansion portion 20.
  • the partial tube expansion block 36 is provided so as to be able to contact and separate from the outer periphery of one tube expansion block 34 among the plurality of tube expansion blocks 34.
  • the contact / separation mechanism of the partially expanded pipe 36 is not particularly limited.
  • the spring mechanism 40 is used.
  • the expanded tube block 34 and the partially expanded block 36 A gap corresponding to at least the thickness of the first pipe 10a to be expanded is provided between them.
  • the pipe expansion block 34 can be inserted and expanded without inserting the partial pipe expansion block 36 into the first pipe 10a.
  • the pipe expansion block 34 is changed from the pipe expansion form (open state) to the insertion form (closed state), so that the pipe expansion block 34 is connected to the expanded connection end of the first pipe 10a.
  • the partially expanded block 36 can be inserted. That is, after the connection end of the first pipe 10a is expanded, the tube expansion block 34 is pulled out from the connection end, the tube expansion block 34 is changed from the expanded form to the inserted form again, and then expanded to the connected end of the first pipe 10a. Block 34 is inserted. At this time, the partial tube expansion block 36 can be simultaneously inserted into the expanded connection end.
  • the partially expanded portion 22 be formed slightly longer than the insertion length L in the expanded block 34 shown in FIG. 3B.
  • the insertion direction length of the partial pipe expansion block 36 to the piping edge part of the 1st piping 10a can be made longer than the insertion direction length of the pipe expansion block 34.
  • the depth of the partial pipe expansion part 22 can be made deeper than the depth from the pipe end part of the uniform pipe expansion part 20 formed in the first pipe 10a. For this reason, even if the connection end of the second pipe 10b is assembled to the expanded connection end of the first pipe 10a in the assembly process described in detail later, the first pipe 10a and the second pipe 10b Between these connection parts, a gap through the partial pipe expansion part 22 is surely formed.
  • the procedure for expanding the connection end portion of the first pipe 10a using the tube expansion jig 30 having such a configuration is first inserted into the connection end portion of the first pipe 10a after the tube expansion block 34 is in the insertion form (first Insertion process). Then, the pipe expansion block 34 is pushed and expanded to uniformly expand the connection end portion of the first pipe 10a to form the uniform pipe expansion section 20 (first pipe expansion process: see (C process) in FIG. 1).
  • the tube expansion block 34 is pulled out from the connection end of the first pipe 10a, and the tube expansion block 34 is changed from the tube expansion configuration to the insertion configuration. And the pipe expansion block 34 is inserted in the connection end part of the 1st piping 10a in the state which made the partial pipe expansion block 36 contact the outer periphery of the pipe expansion block 34 (2nd insertion process). Thereafter, the pipe expansion block 34 is pushed together with the partial pipe expansion block 36 to form the partial pipe expansion portion 22 at the connection end of the first pipe 10a.
  • the contact timing of the partially expanded block 36 with respect to the expanded tube block 34 may be the same as the expanded timing of the expanded tube block 34, and the partially expanded block 36 is attached to the expanded tube block 34 as in the above-described embodiment. You may make it insert the pipe expansion block 34 to the connection end part of the 1st piping 10a in the state contacted previously (2nd pipe expansion process: Refer (D process) of FIG. 1).
  • connection end portion of the second pipe 10b is fitted into the connection end portion of the first pipe 10a, which is expanded (see assembly process: (E process) in FIG. 1). ).
  • Combustion gas is allowed to flow into the temporarily assembled first pipe 10a and second pipe 10b, and the air in the first pipe 10a and the second pipe 10b is opened from the opening of the open end of the partially closed second pipe 10b. Is discharged.
  • the combustion gas for example, the combustion gas of a burner used for brazing, which will be described in detail later, can be used.
  • the combustion gas has a lower oxidizing effect than air
  • the internal air of the first pipe 10a and the second pipe 10b is replaced with the combustion gas, so that the inside of the first pipe 10a and the second pipe 10b is brazed. Formation of an oxide film can be suppressed.
  • the inflow of the combustion gas into the first pipe 10a and the second pipe 10b is performed through a gap formed when the first pipe 10a and the second pipe 10b are assembled.
  • the combustion gas may be introduced from the partial expanded portion 22 formed in the second expanded tube step.
  • the inflow amount of the combustion gas can be controlled by detecting the inflow amount of the gas component from the through-hole 16, but can be generally controlled by the inflow time. Specifically, it varies depending on the diameter and length of the pipe and the jet pressure of the combustion gas. However, if the pipe has a general diameter of about 32 mm, it takes about 20 to 30 seconds regardless of the length.
  • This value is an empirical value derived by back calculation from the inflow time of the combustion gas and the oxide film formation state inside the pipe after brazing.
  • step F Since the combustion gas flows in from the partially expanded portion 22 in the first pipe 10a, the combustion gas flows toward the open end side of the first pipe 10a as shown in FIG. 1 (step F). Become. For this reason, the internal air of the 1st piping 10a and the 2nd piping 10b is formed in the partial obstruction
  • a brazing material is inserted into the heated partially expanded portion 22 and the brazed material is melted to seal the partially expanded portion 22.
  • the brazing material melted in the partially expanded pipe portion 22 is formed at the wettability with the pipe wall surface and at the connection end of the first pipe 10a and the connection end of the second pipe 10b.
  • the gap between the first pipe 10a and the second pipe 10b flows into the gap due to the wetting and spreading due to the capillary phenomenon. Thereby, the clearance gap between the connection end part in the 1st piping 10a and the connection end part in the 2nd piping 10b is filled up. (Brazing process: see (G process) in FIG. 1).
  • the method for connecting two pipes has been described as an example. However, when a plurality of pipes are connected at a time, as shown in FIG.
  • the pipe connection method of the present application can be applied to such a case.
  • FIG. 5 is a diagram showing an example of connecting five pipes such as the first pipe 10a to the fifth pipe 10e, and has four connection parts (connection parts a to d).
  • connection end portions of the connection portions a to d are expanded.
  • the pipe expansion at the connection end may be performed in the order of the first pipe expansion process and the second pipe expansion process, as in the above embodiment.
  • the expansion of the first pipe 10a to the fifth pipe 10e may be performed as follows. First, the right end of the first pipe 10a in the figure is expanded. The second pipe 10b and the fourth pipe 10d are not expanded, but both ends of the third pipe 10c are expanded. About the 5th piping 10e, the left end part in a figure is expanded. By performing the pipe expansion in this way, it is possible to connect each pipe and to perform a connection method as shown below.
  • the pipes are temporarily assembled, and the open ends of the pipes located at both ends are closed by the closing members 12a and 12b.
  • combustion gas is caused to flow into the pipe from the partially expanded portion 22 at the connection portion a indicated by the arrow.
  • the closing member 12a since the partially expanded portion 22 in the connection portions b to d is open, the closing member 12a has a pseudo effect similar to that of the partially closed state (gas replacement step).
  • connection part a is brazed. Thereby, the connection of the 4th piping 10d and the 5th piping 10e is completed (brazing process).
  • the combustion gas is caused to flow into the pipe from the partially expanded portion 22 in the connection portion b. In this step, the air inside the pipe is replaced with the inflowed combustion gas from the partially expanded portion 22 at the connection portions c and d (gas replacement step).
  • connection part b is brazed. Thereby, the connection of the 1st piping 10a and the 2nd piping 10b is completed (brazing process).
  • the combustion gas is introduced from the partially expanded part 22 in the connection part c, and gas replacement is performed. In this step, the internal air and the combustion gas are replaced through the partially expanded portion 22 in the connection portion d remaining as an open portion (gas replacement step).
  • connection portion c is brazed, and the second pipe 10b and the third pipe 10c are connected (brazing step).
  • the connection part d is brazed, and the third pipe 10c and the fourth pipe 10d are connected (brazing process).
  • a pre-process before brazing of the connection part d you may pass through the process of flowing combustion gas into the piping from the partial expansion part 22 in the connection part d.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)

Abstract

Disclosed is a pipe coupling method that does not require joints during pipe coupling and which can reduce the coupling time required. The pipe coupling method has: a blocking step, wherein an open end section of a first pipe (10a) of two pipes is blocked and an open end section of a second pipe (10b) is partially blocked; a pipe extension step, wherein a coupling end section in the first pipe (10a) is extended and part of the extended coupling end section is widened outwards more than other parts to form a partially extended pipe section (22); an installation step, wherein the coupling end section of the second pipe (10b) is inserted into the coupling end section of the extended first pipe (10a); a gas replacement step, wherein combustion gas is caused to flow towards the open end section of the first pipe (10a) from the partially extended pipe section (22) and air inside the pipe is discharged from the open end section of the partially blocked second pipe (10b); and a soldering step, wherein the gap between the coupling end section of the first pipe (10a) and the coupling end section of the second pipe (10b) is filled in after the gas replacement step has been completed.

Description

配管接続方法、および拡管治具、並びに拡管治具を用いた拡管方法Pipe connection method, pipe expansion jig, and pipe expansion method using the pipe expansion jig
　本発明は、空調などに用いられる配管を接続する方法、およびこの方法に用いる拡管治具、並びにこの拡管治具を用いた拡管方法に関する。 The present invention relates to a method of connecting pipes used for air conditioning and the like, a tube expansion jig used in the method, and a tube expansion method using the tube expansion jig.
　パッケージ型空調機が備える１台の室外機と複数の室内機とは、銅管などの配管により接続され、この配管を介して室内外の熱交換が行われる。配管を構成する各銅管は、接合箇所をロウ付けされることで延長されている。
　銅配管は酸化し易いため、ロウ付け時における加熱により、配管の内外周には酸化皮膜が生ずることとなる。ここで、配管内周に酸化皮膜が形成されると、配管内を流れる冷媒等により酸化皮膜が剥離され、剥離された酸化被膜が冷凍機に到達すると、故障などの不具合を招く虞がある。 One outdoor unit and a plurality of indoor units included in the package type air conditioner are connected by a pipe such as a copper pipe, and heat is exchanged indoors and outdoors through the pipe. Each copper pipe which comprises piping is extended by brazing a junction location.
Since copper piping is easily oxidized, an oxide film is formed on the inner and outer circumferences of the piping due to heating during brazing. Here, when an oxide film is formed on the inner periphery of the pipe, the oxide film is peeled off by a refrigerant or the like flowing in the pipe, and if the peeled oxide film reaches the refrigerator, there is a possibility of causing a malfunction such as a failure.
　このような実状を鑑み、ロウ付け時に配管内部に酸化皮膜を生じさせないための手段が種々検討され、特許文献１や特許文献２に開示されている。特許文献１に開示されている手段は、配管を仮組した後に、配管内に存在する空気を不活性ガスに置換し、その後に接続箇所の加熱、ロウ付けを行うというものである。具体的には、室外機の冷媒回路に予め窒素等の不活性ガスを充填しておく。現場にて室外機、室内機、および配管の仮組が終了した後に、冷媒回路内に充填した不活性ガスを配管内部に放出し、配管内部の空気を不活性ガスと置換し、その後にロウ付け工程に移行するというものである。 In view of such a situation, various means for preventing an oxide film from being formed inside the pipe during brazing have been studied and disclosed in Patent Document 1 and Patent Document 2. The means disclosed in Patent Document 1 is to temporarily assemble a pipe, replace the air present in the pipe with an inert gas, and then heat and braze the connected portion. Specifically, the refrigerant circuit of the outdoor unit is previously filled with an inert gas such as nitrogen. After temporary assembly of the outdoor unit, indoor unit, and piping at the site, the inert gas filled in the refrigerant circuit is released into the piping, the air inside the piping is replaced with the inert gas, and then the The process moves to the attaching process.
　また、特許文献２に開示されている手段は、特許文献１に開示されている配管接続方法と同様に、配管内に存在する空気を不活性ガスに置換してロウ付けを行うものであるが、接続に際して継手を使用するというものである。具体的には、接続対象とする配管と略同径の継手を用意する。継手の外周中央付近には、凸状のストッパを形成しておく。接続対象とする配管の端部を拡管し、拡管した部分を継手の両端から挿入する。このようにして仮組した状態で、配管内部の空気を置換し、ストッパに当接させた配管のロウ付けを行うというものである。 In addition, the means disclosed in Patent Document 2 is to perform brazing by replacing the air present in the pipe with an inert gas, as in the pipe connection method disclosed in Patent Document 1. A joint is used for connection. Specifically, a joint having substantially the same diameter as the pipe to be connected is prepared. A convex stopper is formed near the center of the outer periphery of the joint. The end of the pipe to be connected is expanded, and the expanded portion is inserted from both ends of the joint. In this temporarily assembled state, the air inside the pipe is replaced, and the pipe brought into contact with the stopper is brazed.
特開平７－１９０５７５号公報（特許請求の範囲、段落００１４、００１７等）JP-A-7-190575 (claims, paragraphs 0014, 0017, etc.) 特開平７－１８５８０４号公報（段落０００２、００１５から００１９等）JP 7-185804 A (paragraphs 0002, 0015 to 0019, etc.)
　上記のような手段により配管の接続を行うようにすれば、接続対象とする配管内部に酸化皮膜が形成されることを防止することができると考えられる。しかし、特許文献１、２に開示されている手段には、それぞれ次のような問題がある。
　特許文献１に開示されている手段では、まず、予め冷媒回路に不活性ガスを充填しておく必要がある。また、配管長が長くなった場合には、充填した不活性ガスが足らなくなる虞もある。また、特許文献２に開示されている手段では、不活性ガスを配管内に流入させるための、不活性ガスを充填したボンベなどを準備する必要がある。さらに配管を接続する際に継手を用いるため、接続対象とする配管毎に、対応した直径の継手を設ける必要性があると共に、配管や継手が歪んだ場合には、接続対象とする配管に対して継手を使用することができなくなってしまうといった問題もある。 If the pipes are connected by the above means, it is considered that an oxide film can be prevented from being formed inside the pipe to be connected. However, the means disclosed in Patent Documents 1 and 2 have the following problems.
In the means disclosed in Patent Document 1, it is necessary to first fill the refrigerant circuit with an inert gas in advance. Moreover, when the pipe length becomes long, there is a possibility that the filled inert gas may be insufficient. Further, in the means disclosed in Patent Document 2, it is necessary to prepare a cylinder filled with an inert gas for allowing the inert gas to flow into the pipe. In addition, since a joint is used when connecting pipes, it is necessary to provide a joint with a corresponding diameter for each pipe to be connected, and if the pipe or joint is distorted, There is also a problem that the joint cannot be used.
　また、両手段を実施する場合には、作業員は配管における不活性ガスの流入口と排出口との間を往復して、不活性ガスの置換状況を確認しながら、配管の接続作業を行う必要がある。接続された後の配管は、種々のケースが想定されるが、一般的なビルであっても、高低差５０ｍ、配管長１００ｍ近くに及ぶため、流入口と排出口との往復作業は、接続作業を行う上での大きな負担となる。 In addition, when implementing both means, the worker reciprocates between the inlet and outlet of the inert gas in the pipe, and performs the pipe connection work while checking the replacement status of the inert gas. There is a need. The pipes after connection are assumed to be in various cases, but even in a general building, the height difference is 50 m and the pipe length is close to 100 m. It becomes a big burden in performing work.
　そこで本発明では、上記問題を解決し、配管接続のための別部品を使用することが無く、ガス充填時に必要とされる往復作業の負担を軽減することのできる配管接続方法を提供することを第１の目的とする。また、本発明では、前記目的を達成するための配管接続方法に用いられる拡管治具の提供、並びにこの拡管治具を用いた拡管方法を提供することを第２の目的とする。 Accordingly, the present invention provides a pipe connection method that solves the above-described problems, does not use separate parts for pipe connection, and can reduce the burden of reciprocating work required during gas filling. The first purpose. The second object of the present invention is to provide a tube expansion jig used in a pipe connection method for achieving the above object, and to provide a tube expansion method using the tube expansion jig.
　上記目的を達成するための本発明に係る配管接続方法は、接続端部と開放端部を有する２本の配管のうち、一方の配管における開放端部を閉塞すると共に、他方の配管における開放端部を部分閉塞する閉塞工程と、前記一方の配管における前記接続端部を拡管すると共に前記拡管された接続端部の一部を他の部位よりも外側へ広げて部分拡管部を形成する拡管工程と、前記他方の配管の前記接続端部を前記一方の配管の前記拡管された接続端部に挿入する組付け工程と、前記部分拡管部から前記一方の配管における前記開放端部へ向けて燃焼ガスを流入させると共に、前記他方の配管における前記部分閉塞された開放端部から前記２本の配管内の空気を排出させるガス置換工程と、前記ガス置換工程終了後に前記一方の配管における前記接続端部と前記他方の配管における前記接続端部との隙間を穴埋めするロウ付け工程とを有することを特徴とする。 In order to achieve the above object, a pipe connection method according to the present invention is configured to close an open end of one pipe and open an end of the other pipe out of two pipes having a connection end and an open end. A blocking step of partially blocking the portion, and a tube expanding step of expanding the connecting end portion of the one pipe and expanding a part of the expanded connecting end portion outside the other portion to form a partially expanded portion. And an assembly step of inserting the connection end of the other pipe into the expanded connection end of the one pipe, and combustion from the partially expanded section toward the open end of the one pipe A gas replacement step for allowing gas to flow in and exhausting the air in the two piping from the partially closed open end of the other piping; and the contact in the one piping after the gas replacement step is completed. And having a brazing step of filling the gap between the connection end of the other pipe and an end portion.
　また、上記特徴を有する配管接続方法において、前記拡管工程は、前記一方の配管における前記接続端部を均等に拡管して均等拡管部を形成する第１拡管工程と、前記第１拡管工程を終了した前記一方の配管における前記均等拡管部の一部をさらに拡管して部分拡管部を形成する第２拡管工程とから成るようにすると良い。
　このような段階的な拡管を行うことで、拡管工程において配管における接続端部が破損することを抑制することができる。 Further, in the pipe connection method having the above characteristics, the pipe expansion process ends the first pipe expansion process and the first pipe expansion process in which the connection end portion of the one pipe is uniformly expanded to form an equal expansion section. It is preferable to further include a second pipe expanding step of further expanding a part of the uniform pipe expanding part in the one pipe to form a partial pipe expanding part.
By performing such stepwise pipe expansion, it is possible to prevent the connection end portion of the pipe from being damaged in the pipe expansion process.
　また、上記特徴を有する配管接続方法では、前記部分拡管部を前記一方の配管の下側に形成することが望ましい。
　部分拡管部を一方の配管の下側に配置することで、ガス置換の効率を向上させることができ、ロウ付け工程後における配管内部の酸化皮膜発生率を低下させることができる。
　さらに、上記特徴を有する配管接続方法において、前記閉塞工程で前記他方の配管における前記開放端部を部分閉塞する際に、前記開放端部の開口面積を絞ると共に、絞られた後の開口部を対地方向へ向けるようにすると良い。
　このような特徴的方法も、ロウ付け工程後における配管内部の酸化皮膜発生率を低下させることに寄与する。 In the pipe connection method having the above characteristics, it is preferable that the partial pipe expansion portion is formed below the one pipe.
By disposing the partially expanded portion below one pipe, the efficiency of gas replacement can be improved, and the rate of oxide film generation inside the pipe after the brazing process can be reduced.
Further, in the pipe connection method having the above characteristics, when partially closing the open end of the other pipe in the closing step, the opening area of the open end is reduced, and the opening after being reduced is It is better to turn to the ground direction.
Such a characteristic method also contributes to reducing the rate of oxide film generation inside the pipe after the brazing step.
　また、上記目的を達成するための本発明に係る拡管治具は、錐体状の中心部材と、前記中心部材の外周上に複数配置されて円筒状の外形を形成すると共に、前記中心部材を錐体の中心軸方向へ移動させることにより外周側へ放射状に押出され、配管端部を拡管して拡管部を形成する拡管ブロックと、前記拡管ブロックにより構成される円筒形状の外周側に、当該外周に対して接離可能に配置され、前記外周に対して接触させた状態で前記中心部材を前記中心軸方向に移動させることで、前記配管に形成された前記拡管部の一部をさらに外側へ広げて部分拡管部を形成する部分拡管ブロックと、を有し、前記部分拡管ブロックが前記拡管ブロックの外周に対して離間状態にあるときには、拡管対象とする配管の少なくとも肉厚分の間隙を備えることを特徴とする。 In addition, a tube expansion jig according to the present invention for achieving the above object includes a cone-shaped center member and a plurality of arranged on the outer periphery of the center member to form a cylindrical outer shape. By moving in the direction of the central axis of the cone, the pipe is radially extruded to the outer peripheral side, and the pipe end is expanded to form a pipe expanding part, and the cylindrical outer peripheral side constituted by the pipe expanding block is A part of the expanded portion formed in the pipe is further outside by moving the center member in the direction of the center axis while being arranged so as to be able to contact and separate from the outer periphery. A partially expanded block that forms a partially expanded portion, and when the partially expanded block is in a separated state with respect to the outer periphery of the expanded block, a gap corresponding to at least a thickness of the pipe to be expanded is provided. Preparation It is characterized in.
　また、上記特徴を有する拡管治具では、前記部分拡管ブロックの前記配管端部への挿入方向長さを、前記拡管ブロックの前記配管端部への挿入方向長さよりも長くすることが望ましい。
　このような構成とすることで、部分拡管部の配管端部からの深さを、均等拡管部の配管端部からの深さよりも深く形成することができる。このため、燃焼ガスを流入させる際、部分拡管部に、一方の配管と他方の配管との間の隙間を確実に確保することが可能となる。 Moreover, in the pipe expansion jig having the above characteristics, it is preferable that the length of the partial pipe expansion block inserted in the pipe end is longer than the length of the pipe expansion block inserted in the pipe end.
By setting it as such a structure, the depth from the pipe end part of a partial pipe expansion part can be formed deeper than the depth from the pipe end part of a uniform pipe expansion part. For this reason, when injecting combustion gas, it becomes possible to ensure reliably the gap between one piping and the other piping in a partial expansion part.
　さらに、本発明に係る拡管治具を用いた拡管方法は、錐体状の中心部材と、前記中心部材の外周上に複数配置されて円筒状の外形を形成すると共に、前記中心部材を錐体の中心軸方向へ移動させることにより外周側へ放射状に押出され、配管端部を拡管して拡管部を形成する拡管ブロックと、前記拡管ブロックにより構成される円筒形状の外周側に、当該外周に対して接離可能に配置され、前記外周に対して接触させた状態で前記中心部材を前記中心軸方向に移動させることで、前記配管に形成された前記拡管部の一部をさらに外側へ広げる部分拡管部を形成する部分拡管ブロックと、を有し、前記部分拡管ブロックが前記拡管ブロックの外周に対して離間状態にあるときには、拡管対象とする配管の少なくとも肉厚分の間隙を備える拡管治具を用いた拡管方法であって、前記拡管対象とする配管の端部に、前記拡管ブロックを挿入する第１挿入工程と、前記中心部材を移動させて前記端部を均等に拡管して均等拡管部を形成する第１拡管工程と、前記第１拡管工程終了後、前記拡管ブロックの外周に対して前記部分拡管ブロックを接触させた状態の前記拡管ブロックを、前記均等拡管部に挿入する第２挿入工程と、前記中心部材を移動させて前記拡管ブロックを押出し、前記均等拡管部の一部をさらに拡管して部分拡管部を形成する第２拡管工程とを有することを特徴とする。
　上記のような特徴を有する配管接続方法によれば、配管を接続する際に、継手などの別部品を使用する必要が無くなる。また、ガス充填時に必要とされる往復作業の負担を軽減することができる。 Furthermore, the tube expansion method using the tube expansion jig according to the present invention includes a cone-shaped central member and a plurality of the central member arranged on the outer periphery of the central member to form a cylindrical outer shape, and the central member is formed into a cone. Are expanded radially to the outer peripheral side by moving in the direction of the central axis of the tube, and a tube expansion block that expands the pipe end portion to form a tube expansion portion, and a cylindrical outer peripheral side constituted by the tube expansion block, The center member is moved in the direction of the central axis while being arranged so as to be able to contact and separate from the outer periphery, so that a part of the expanded portion formed in the pipe is further expanded outward. A partially expanded block that forms a partially expanded portion, and when the partially expanded block is in a separated state with respect to the outer periphery of the expanded tube block, a tube expansion treatment including a gap corresponding to at least the thickness of the pipe to be expanded A first insertion step of inserting the tube expansion block into an end portion of the pipe to be expanded, and moving the central member to expand the end portion evenly to uniformly expand the tube. A first expansion step for forming a portion, and a second expansion block after the first expansion step is completed, in which the partial expansion block in contact with the outer periphery of the expansion block is inserted into the equal expansion portion It has an insertion process and the 2nd pipe expansion process which moves the central member, extrudes the pipe expansion block, and further expands a part of the uniform pipe expansion part, and forms a partial pipe expansion part.
According to the pipe connection method having the above-described features, it is not necessary to use another part such as a joint when connecting pipes. Moreover, the burden of the reciprocation work required at the time of gas filling can be reduced.
　上記のような特徴を有する配管接続方法によれば、配管を接続する際に、継手などの別部品を使用する必要が無くなる。また、ガス充填時に必要とされる往復作業の負担を軽減することができる。 According to the pipe connection method having the above characteristics, it is not necessary to use separate parts such as a joint when connecting the pipes. Moreover, the burden of the reciprocation work required at the time of gas filling can be reduced.
実施形態に係る配管接続方法の流れを説明するための図である。It is a figure for demonstrating the flow of the piping connection method which concerns on embodiment. 部分拡管された配管における接続端部の形状を示す図である。It is a figure which shows the shape of the connection edge part in the pipe expanded partially. 均等拡管部を形成する際の拡管治具の挿入形態における正面図である。It is a front view in the insertion form of the pipe expansion jig at the time of forming a uniform pipe expansion part. 均等拡管部を形成する際の拡管治具の挿入形態における右側面断面図である。It is right side sectional drawing in the insertion form of the pipe expansion jig | tool at the time of forming a uniform pipe expansion part. 均等拡管部を形成する際の拡管治具の拡管形態における正面図である。It is a front view in the pipe expansion form of the pipe expansion jig at the time of forming a uniform pipe expansion part. 均等拡管部を形成する際の拡管治具の拡管形態における右側面断面図である。It is right side sectional drawing in the pipe expansion form of the pipe expansion jig at the time of forming a uniform pipe expansion part. 部分拡管部を形成する際の拡管治具の挿入形態における正面図である。It is a front view in the insertion form of the pipe expansion jig at the time of forming a partial pipe expansion part. 部分拡管部を形成する際の拡管治具の挿入形態における右側面断面図である。It is right side sectional drawing in the insertion form of the pipe expansion jig at the time of forming a partial pipe expansion part. 部分拡管部を形成する際の拡管治具の拡管形態における正面図である。It is a front view in the pipe expansion form of the pipe expansion jig at the time of forming a partial pipe expansion part. 部分拡管部を形成する際の拡管治具の拡管形態における右側面断面図である。It is right side sectional drawing in the pipe expansion form of the pipe expansion jig at the time of forming a partial pipe expansion part. 複数の配管を接続する際に適用可能な配管接続方法の応用例を説明するための図である。It is a figure for demonstrating the application example of the pipe connection method applicable when connecting a some piping. パッケージ型空調機における室外機と室内機の配置形態を説明するための図である。It is a figure for demonstrating the arrangement | positioning form of the outdoor unit and indoor unit in a package type air conditioner.
　以下、本発明の配管接続方法、および拡管治具、並びに拡管治具を用いた拡管方法に係る実施の形態について、図面を参照しつつ詳細に説明する。
　図６は、パッケージ型空調機における室外機５０と室内機５２の配置形態を示すものである。図６には、ビルの屋上に配置された室外機５０と、ビルの１階に配置された複数の室内機５２とを配管１０により接続する例を示している。
　本発明の配管接続方法は、このように延設される配管を接続する際に実施するのに好適な方法である。本発明の配管接続方法に係る第１の実施形態について、図１、図２を参照して説明する。 Hereinafter, embodiments according to a pipe connection method, a pipe expansion jig, and a pipe expansion method using the pipe expansion jig of the present invention will be described in detail with reference to the drawings.
FIG. 6 shows an arrangement form of the outdoor unit 50 and the indoor unit 52 in the package type air conditioner. FIG. 6 shows an example in which an outdoor unit 50 arranged on the roof of a building and a plurality of indoor units 52 arranged on the first floor of the building are connected by a pipe 10.
The pipe connection method of the present invention is a method suitable for carrying out when connecting the pipes thus extended. 1st Embodiment which concerns on the piping connection method of this invention is described with reference to FIG. 1, FIG.
　まず、接続対象とする２本の配管（第１配管１０ａ，第２配管１０ｂ）を用意する。ここで、図１に示す２本の配管（第１配管１０ａ，第２配管１０ｂ）のうち、第１配管１０ａを室外機５０側に接続された配管（一方の配管）とし、第２配管１０ｂを、第１配管１０ａに接続する定尺（例えば４ｍ）の配管（他方の配管）とする（図１の（Ａ工程）参照）。 First, two pipes (first pipe 10a and second pipe 10b) to be connected are prepared. Here, of the two pipes (first pipe 10a and second pipe 10b) shown in FIG. 1, the first pipe 10a is a pipe (one pipe) connected to the outdoor unit 50 side, and the second pipe 10b. Is a fixed-length pipe (for example, 4 m) connected to the first pipe 10a (the other pipe) (see (A process) in FIG. 1).
　次に、第１配管１０ａの開放端部を閉塞すると共に、第２配管１０ｂの開放端部を部分閉塞する。本実施形態の場合、第１配管１０ａの開放端部には室外機５０が接続されており、当該開放端部は閉塞状態にあるため、この状態を維持すれば良い。なお、第１配管１０ａの両端が開放されている場合には、図１の（Ｂ工程）に示すように、第１配管１０ａの開放端部にキャップなどの閉塞部材１２を配置すれば良い。一方、第２配管１０ｂの開放端部を部分閉塞する方法としては、部分閉塞部材１４を第２配管１０ｂの開放端部の開口部に配置して、開放端部の開口面積を絞れば良い。具体的には、第２配管１０ｂの開放端部の部分閉塞すべき面に、第２配管１０ｂの口径に対応し且つ少なくとも１つの貫通孔１６を有するキャップを配置すれば良い。ここで、貫通孔１６は、部分閉塞すべき面にキャップを配置した際に、当該面の中心付近に配置されるように、キャップに設けることが望ましい。貫通孔１６の孔径は、接続対象とする第２配管１０ｂの直径にも依存するが、第２配管１０ｂの直径が１５ｍｍ～３２ｍｍ程度の範囲であれば、約９ｍｍ程度の孔径で良い。また、貫通孔１６には、いわゆるエルボなどの経路屈曲部材１８を配置し、第２配管１０ｂの絞られた後の前記開口部を対地方向へ向けるようにすることが望ましい。このように第２配管１０ｂの開放端部を部分閉塞することで、配管内部の気体と燃焼ガスとの置換率を高めることができ、ロウ付け時における配管内部の酸化皮膜形成を抑制することができるからである（閉塞工程：図１の（Ｂ工程）参照）。 Next, the open end of the first pipe 10a is closed, and the open end of the second pipe 10b is partially closed. In the case of this embodiment, the outdoor unit 50 is connected to the open end of the first pipe 10a, and the open end is in a closed state, so this state may be maintained. When both ends of the first pipe 10a are open, a closing member 12 such as a cap may be disposed at the open end of the first pipe 10a as shown in FIG. 1 (Step B). On the other hand, as a method of partially closing the open end portion of the second pipe 10b, the partial closing member 14 may be disposed in the opening portion of the open end portion of the second pipe 10b to reduce the opening area of the open end portion. Specifically, a cap corresponding to the diameter of the second pipe 10b and having at least one through hole 16 may be disposed on the surface to be partially closed at the open end of the second pipe 10b. Here, the through-hole 16 is desirably provided in the cap so that when the cap is disposed on the surface to be partially closed, the through-hole 16 is disposed near the center of the surface. The hole diameter of the through hole 16 depends on the diameter of the second pipe 10b to be connected, but may be about 9 mm if the diameter of the second pipe 10b is in the range of about 15 mm to 32 mm. In addition, it is desirable that a path bending member 18 such as a so-called elbow is disposed in the through hole 16 so that the opening after the second pipe 10b is narrowed is directed in the ground direction. Thus, by partially closing the open end of the second pipe 10b, the replacement rate between the gas inside the pipe and the combustion gas can be increased, and the formation of an oxide film inside the pipe during brazing can be suppressed. This is because it can be performed (blocking step: see (step B) in FIG. 1).
　次に、第１配管１０ａの接続端部に拡管治具３０（図３Ａ、図３Ｂ、図３Ｃ、図３Ｄ、図４Ａ、図４Ｂ、図４Ｃ、図４Ｄ参照）を挿入し、接続端部の拡管を行う。拡管に用いる拡管治具３０は、図３Ａ、図３Ｂ、図３Ｃ、図３Ｄ、図４Ａ、図４Ｂ、図４Ｃ、図４Ｄに示すように、円錐形状を成す中心部材３２と、この中心部材３２の外周上に配置された複数の拡管ブロック３４、および拡管ブロック３４の外周側に配置された部分拡管ブロック３６を備えている。中心部材３２、拡管ブロック３４、および部分拡管ブロック３６は共に、拡管治具３０を構成するブロックベース３８に配置され、このブロックベース３８を基点として移動や拡開が成されることとなる。 Next, the tube expansion jig 30 (see FIG. 3A, FIG. 3B, FIG. 3C, FIG. 3D, FIG. 4A, FIG. 4B, FIG. 4C, and FIG. 4D) is inserted into the connection end of the first pipe 10a. Expand the tube. As shown in FIGS. 3A, 3B, 3C, 3D, 4A, 4B, 4C, and 4D, a tube expansion jig 30 used for tube expansion includes a central member 32 having a conical shape, and the central member 32. A plurality of tube expansion blocks 34 disposed on the outer periphery of the tube, and a partial tube expansion block 36 disposed on the outer periphery side of the tube expansion block 34. The central member 32, the pipe expansion block 34, and the partial pipe expansion block 36 are all arranged on a block base 38 constituting the pipe expansion jig 30, and the block base 38 is used as a base point for movement and expansion.
　中心部材３２は、図示しないハンドルを操作することにより、図３Ｂの矢印Ａで示す中心軸方向へ移動する。中心部材３２は円錐形状であり、中心部材３２と拡管ブロック３４との接触面は、テーパ形状である。このため、中心部材３２が前方へ押し出されることにより、中心部材３２の外周に配置された拡管ブロック３４は、中心部材３２の外周側（半径方向）へ、押し出されることとなる。 The center member 32 moves in the direction of the center axis indicated by the arrow A in FIG. 3B by operating a handle (not shown). The center member 32 has a conical shape, and the contact surface between the center member 32 and the tube expansion block 34 has a tapered shape. For this reason, when the center member 32 is pushed forward, the tube expansion block 34 arranged on the outer periphery of the center member 32 is pushed toward the outer periphery side (radial direction) of the center member 32.
　拡管ブロック３４は、複数（本実施形態に示す例では６つ）のブロックを組み合わせることにより、外形形状が円筒形となっている。このため、中心部材３２の移動に伴って外周側へ押出されることで、拡管ブロック３４は、第１配管１０ａの接続端部を均等に拡管し、均等拡管部２０を形成することとなる。 The tube expansion block 34 has a cylindrical outer shape by combining a plurality of blocks (six in the example shown in the present embodiment). For this reason, the tube expansion block 34 is uniformly expanded at the connection end portion of the first pipe 10 a by being pushed toward the outer peripheral side with the movement of the center member 32, thereby forming the equal tube expansion portion 20.
　部分拡管ブロック３６は、複数の拡管ブロック３４のうちの１つの拡管ブロック３４の外周に対して、接離可能に設けられる。部分拡管ブロック３６の接離機構に関しては特に限定するものでは無いが、例えば図３Ａ、図３Ｂ、図３Ｃ、図３Ｄ、図４Ａ、図４Ｂ、図４Ｃ、図４Ｄに示すように、バネ機構４０を用いることもできる。このようなバネ機構４０を用いた場合、通常状態（均等拡管部２０を形成する際）では図３Ａ、図３Ｂ、図３Ｃ、図３Ｄに示すように、拡管ブロック３４と部分拡管ブロック３６との間に、拡管対象とする第１配管１０ａの少なくとも肉厚分の間隙を設けるようにする。これにより、第１配管１０ａ内に部分拡管ブロック３６を挿入することなく拡管ブロック３４のみを挿入して拡管を行うことができる。一方で、拡管が終了した後に、拡管ブロック３４を拡管形態（開いた状態）から挿入形態（閉じた状態）とすることにより、第１配管１０ａの拡管された接続端部へは、拡管ブロック３４に加えて部分拡管ブロック３６も挿入可能となる。すなわち、第１配管１０ａの接続端部の拡管後に、拡管ブロック３４を当該接続端部から引抜き、拡管ブロック３４を拡管形態から再び挿入形態とした上で、第１配管１０ａの接続端部に拡管ブロック３４を挿入する。このとき、部分拡管ブロック３６も同時に、拡管された接続端部へ挿入することが可能となる。このような状態で図示しないハンドルを操作して拡管治具３０の中心部材３２を移動させることで、拡管ブロック３４は再び外周側へ押出されることとなる。ここで、部分拡管ブロック３６は拡管ブロック３４の押出しに伴って第１配管１０ａの接続端部の内壁に当接する際にバネが押し縮められ、図４Ａ、図４Ｂ、図４Ｃ、図４Ｄに示すように拡管ブロック３４の外周に接触した状態となり、拡管ブロック３４と共に押出される。部分拡管ブロック３６が配置された部分（部分拡管ブロック配置部）では、他の拡管ブロック配置部に比べて中心部材３２からの半径が大きくなっている。このため、部分拡管ブロック３６配置部のみが第１配管１０ａの接続端部をさらに外側へ押し広げて、部分拡管部２２を形成することが可能となる。 The partial tube expansion block 36 is provided so as to be able to contact and separate from the outer periphery of one tube expansion block 34 among the plurality of tube expansion blocks 34. The contact / separation mechanism of the partially expanded pipe 36 is not particularly limited. For example, as shown in FIGS. 3A, 3B, 3C, 3D, 4A, 4B, 4C, and 4D, the spring mechanism 40 is used. Can also be used. When such a spring mechanism 40 is used, as shown in FIGS. 3A, 3B, 3C, and 3D, in the normal state (when the uniform expanded portion 20 is formed), the expanded tube block 34 and the partially expanded block 36 A gap corresponding to at least the thickness of the first pipe 10a to be expanded is provided between them. Thereby, only the pipe expansion block 34 can be inserted and expanded without inserting the partial pipe expansion block 36 into the first pipe 10a. On the other hand, after the pipe expansion is completed, the pipe expansion block 34 is changed from the pipe expansion form (open state) to the insertion form (closed state), so that the pipe expansion block 34 is connected to the expanded connection end of the first pipe 10a. In addition, the partially expanded block 36 can be inserted. That is, after the connection end of the first pipe 10a is expanded, the tube expansion block 34 is pulled out from the connection end, the tube expansion block 34 is changed from the expanded form to the inserted form again, and then expanded to the connected end of the first pipe 10a. Block 34 is inserted. At this time, the partial tube expansion block 36 can be simultaneously inserted into the expanded connection end. In this state, by operating a handle (not shown) to move the central member 32 of the tube expansion jig 30, the tube expansion block 34 is pushed out to the outer peripheral side again. Here, when the partial pipe expansion block 36 abuts against the inner wall of the connection end of the first pipe 10a as the pipe expansion block 34 is pushed out, the spring is compressed and compressed, as shown in FIGS. 4A, 4B, 4C, and 4D. Thus, the tube expands in a state of being in contact with the outer periphery of the tube expansion block 34 and is extruded together with the tube expansion block 34. In the portion where the partial pipe expansion block 36 is arranged (partial pipe expansion block arrangement portion), the radius from the central member 32 is larger than that of the other pipe expansion block arrangement portions. For this reason, only the part where the partial pipe expansion block 36 is arranged can push the connection end part of the first pipe 10 a further outward to form the partial pipe expansion part 22.
　このような構成とすることにより、均等拡管部２０の形成と部分拡管部２２の形成とを１つの治具で簡単に実施することが可能となる。また、均等拡管部２０の形成と部分拡管部２２の形成とを段階的に行う事を可能としたことにより、拡管時における配管の破損率を減少させることができる。なお、部分拡管部２２は図３Ｂに示す拡管ブロック３４における挿入長さＬよりも若干長く形成しておくことが望ましい。このような構成とすることにより、第１配管１０ａの配管端部への部分拡管ブロック３６の挿入方向長さを、拡管ブロック３４の挿入方向長さよりも長くすることができる。したがって、第１配管１０ａに形成される均等拡管部２０の配管端部からの深さよりも、部分拡管部２２の深さを深くすることができる。このため、詳細を後述する組付け工程において、第１配管１０ａの拡管された接続端部に、第２配管１０ｂの接続端部を組付けたとしても、第１配管１０ａと第２配管１０ｂとの接続部の間には、部分拡管部２２を介した隙間が確実に形成されることとなる。 By adopting such a configuration, it is possible to easily form the uniform expanded portion 20 and the partially expanded portion 22 with a single jig. Moreover, by making it possible to perform the formation of the uniform expanded portion 20 and the partially expanded portion 22 in a stepwise manner, it is possible to reduce the failure rate of the pipe during expansion. It is desirable that the partially expanded portion 22 be formed slightly longer than the insertion length L in the expanded block 34 shown in FIG. 3B. By setting it as such a structure, the insertion direction length of the partial pipe expansion block 36 to the piping edge part of the 1st piping 10a can be made longer than the insertion direction length of the pipe expansion block 34. FIG. Therefore, the depth of the partial pipe expansion part 22 can be made deeper than the depth from the pipe end part of the uniform pipe expansion part 20 formed in the first pipe 10a. For this reason, even if the connection end of the second pipe 10b is assembled to the expanded connection end of the first pipe 10a in the assembly process described in detail later, the first pipe 10a and the second pipe 10b Between these connection parts, a gap through the partial pipe expansion part 22 is surely formed.
　このような構成の拡管治具３０を用いた第１配管１０ａにおける接続端部の拡管手順はまず、拡管ブロック３４を挿入形態とした上で第１配管１０ａの接続端部へ挿入する（第１挿入工程）。その後、拡管ブロック３４を押し広げて第１配管１０ａの接続端部を均等に拡管し、均等拡管部２０を形成する（第１拡管工程：図１の（Ｃ工程）参照）。 The procedure for expanding the connection end portion of the first pipe 10a using the tube expansion jig 30 having such a configuration is first inserted into the connection end portion of the first pipe 10a after the tube expansion block 34 is in the insertion form (first Insertion process). Then, the pipe expansion block 34 is pushed and expanded to uniformly expand the connection end portion of the first pipe 10a to form the uniform pipe expansion section 20 (first pipe expansion process: see (C process) in FIG. 1).
　次に、拡管ブロック３４を第１配管１０ａの接続端部から引抜き、拡管ブロック３４を拡管形態から挿入形態とする。そして、部分拡管ブロック３６を拡管ブロック３４の外周に接触させた状態で第１配管１０ａの接続端部に拡管ブロック３４を挿入する（第２挿入工程）。その後、部分拡管ブロック３６と一緒に拡管ブロック３４を押し広げ、第１配管１０ａの接続端部に部分拡管部２２を形成する。なお、拡管ブロック３４に対する部分拡管ブロック３６の接触タイミングは、拡管ブロック３４の拡開タイミングと同じであっても良いし、上述した実施形態のように、拡管ブロック３４に対して部分拡管ブロック３６を予め接触させた状態で、第１配管１０ａの接続端部への拡管ブロック３４の挿入を行うようにしても良い（第２拡管工程：図１の（Ｄ工程）参照）。 Next, the tube expansion block 34 is pulled out from the connection end of the first pipe 10a, and the tube expansion block 34 is changed from the tube expansion configuration to the insertion configuration. And the pipe expansion block 34 is inserted in the connection end part of the 1st piping 10a in the state which made the partial pipe expansion block 36 contact the outer periphery of the pipe expansion block 34 (2nd insertion process). Thereafter, the pipe expansion block 34 is pushed together with the partial pipe expansion block 36 to form the partial pipe expansion portion 22 at the connection end of the first pipe 10a. Note that the contact timing of the partially expanded block 36 with respect to the expanded tube block 34 may be the same as the expanded timing of the expanded tube block 34, and the partially expanded block 36 is attached to the expanded tube block 34 as in the above-described embodiment. You may make it insert the pipe expansion block 34 to the connection end part of the 1st piping 10a in the state contacted previously (2nd pipe expansion process: Refer (D process) of FIG. 1).
　第２拡管工程が終了した後、第１配管１０ａの拡管された接続端部に、第２配管１０ｂの接続端部を嵌め込んで仮組する（組付け工程：図１の（Ｅ工程）参照）。
　仮組した第１配管１０ａと第２配管１０ｂに対し、燃焼ガスを流入させると共に、部分閉塞された第２配管１０ｂの開放端部の開口部から第１配管１０ａおよび第２配管１０ｂ内の空気を排出する。燃焼ガスとしては、例えば詳細を後述するロウ付けに用いるバーナーの燃焼ガスを用いるようにすることができる。燃焼ガスは、空気に比べて酸化作用が低いため、第１配管１０ａと第２配管１０ｂの内部空気を燃焼ガスにより置換することで、ロウ付け時に第１配管１０ａおよび第２配管１０ｂの内部に酸化皮膜が形成されることを抑制することができる。 After the second pipe expansion step is completed, the connection end portion of the second pipe 10b is fitted into the connection end portion of the first pipe 10a, which is expanded (see assembly process: (E process) in FIG. 1). ).
Combustion gas is allowed to flow into the temporarily assembled first pipe 10a and second pipe 10b, and the air in the first pipe 10a and the second pipe 10b is opened from the opening of the open end of the partially closed second pipe 10b. Is discharged. As the combustion gas, for example, the combustion gas of a burner used for brazing, which will be described in detail later, can be used. Since the combustion gas has a lower oxidizing effect than air, the internal air of the first pipe 10a and the second pipe 10b is replaced with the combustion gas, so that the inside of the first pipe 10a and the second pipe 10b is brazed. Formation of an oxide film can be suppressed.
　燃焼ガスの第１配管１０ａおよび第２配管１０ｂ内への流入は、第１配管１０ａと第２配管１０ｂを組付けた際にできる隙間から行う。具体的には図１の（Ｆ工程）に示すように、第２拡管工程にて形成した部分拡管部２２から燃焼ガスの流入を行うようにすれば良い。燃焼ガスの流入量は、貫通孔１６からのガス成分の流入量を検出して制御することも可能であるが、概ね流入時間によって制御することができる。具体的には、配管の直径や長さ、および燃焼ガスの噴出圧力などによっても変化するが、一般的な直径φ３２ｍｍ程度の配管であれば、長さに係わり無く２０秒～３０秒程度の時間、燃焼ガスを流入させることで、燃焼ガスによる置換を完了させることができる。なお、この値は、燃焼ガスの流入時間と、ロウ付け後の配管内部の酸化皮膜形成状態から逆算して導き出された経験的な値である。 The inflow of the combustion gas into the first pipe 10a and the second pipe 10b is performed through a gap formed when the first pipe 10a and the second pipe 10b are assembled. Specifically, as shown in FIG. 1 (step F), the combustion gas may be introduced from the partial expanded portion 22 formed in the second expanded tube step. The inflow amount of the combustion gas can be controlled by detecting the inflow amount of the gas component from the through-hole 16, but can be generally controlled by the inflow time. Specifically, it varies depending on the diameter and length of the pipe and the jet pressure of the combustion gas. However, if the pipe has a general diameter of about 32 mm, it takes about 20 to 30 seconds regardless of the length. By replacing the combustion gas, the replacement with the combustion gas can be completed. This value is an empirical value derived by back calculation from the inflow time of the combustion gas and the oxide film formation state inside the pipe after brazing.
　第１配管１０ａにおける部分拡管部２２から燃焼ガスの流入を行うため、燃焼ガスは図１の（Ｆ工程）に示すように、第１配管１０ａの開放端部側へ向けて流入されることとなる。このため、第１配管１０ａと第２配管１０ｂの内部空気は、図１の（Ｆ工程）中に示した矢印のように第２配管１０ｂの開放端部に配置した部分閉塞部材１４に形成された貫通孔１６から放出されることとなり、燃焼ガスによる内部空気の置換が効果的に成されることとなるのである（ガス置換工程：図１の（Ｆ工程）参照）。 Since the combustion gas flows in from the partially expanded portion 22 in the first pipe 10a, the combustion gas flows toward the open end side of the first pipe 10a as shown in FIG. 1 (step F). Become. For this reason, the internal air of the 1st piping 10a and the 2nd piping 10b is formed in the partial obstruction | occlusion member 14 arrange | positioned at the open end part of the 2nd piping 10b like the arrow shown in (F process) of FIG. Thus, the internal air is effectively replaced by the combustion gas (see the gas replacement step: (step F) in FIG. 1).
　ガス置換工程終了後、加熱された部分拡管部２２にロウ材を挿入し、このロウ材を溶融させることで部分拡管部２２を封止する。このような作業と併行して、部分拡管部２２にて溶融したロウ材は、配管壁面との濡れ性と、第１配管１０ａの接続端部と第２配管１０ｂの接続端部とに形成される間隙の毛細管現象による濡れ広がりとにより、第１配管１０ａと第２配管１０ｂとの間隙に流し込まれることとなる。これにより、第１配管１０ａにおける接続端部と第２配管１０ｂにおける接続端部との隙間が穴埋めされる。（ロウ付け工程：図１の（Ｇ工程）参照）。 After completion of the gas replacement step, a brazing material is inserted into the heated partially expanded portion 22 and the brazed material is melted to seal the partially expanded portion 22. In parallel with this operation, the brazing material melted in the partially expanded pipe portion 22 is formed at the wettability with the pipe wall surface and at the connection end of the first pipe 10a and the connection end of the second pipe 10b. The gap between the first pipe 10a and the second pipe 10b flows into the gap due to the wetting and spreading due to the capillary phenomenon. Thereby, the clearance gap between the connection end part in the 1st piping 10a and the connection end part in the 2nd piping 10b is filled up. (Brazing process: see (G process) in FIG. 1).
　上記のような配管接続方法によれば、第１に、継手など、配管接続のための別部品を不要とすることができる。また、長くとも定尺配管の４ｍ程度を往復すれば良いこととなるため、ガス充填時に必要とされる往復作業の負担を軽減することが可能となる。 According to the pipe connection method as described above, first, separate parts for pipe connection such as a joint can be made unnecessary. In addition, since it is only necessary to reciprocate about 4 m of the fixed pipe at the longest, it is possible to reduce the burden of reciprocating work required at the time of gas filling.
　上記実施形態では、２本の配管を接続する際の方法を例に挙げて説明した。しかしながら、複数の配管を一時に接続する際には、図５に示すように複数個所に接続部を有することとなる。本願の配管接続方法は、このような場合に対しても適用することが可能となる。 In the above embodiment, the method for connecting two pipes has been described as an example. However, when a plurality of pipes are connected at a time, as shown in FIG. The pipe connection method of the present application can be applied to such a case.
　例えば図５は、第１配管１０ａ～第５配管１０ｅといった５本の配管を接続する場合の例を示す図であり、接続部を４箇所（接続部ａ～ｄ）有する。このような配管を接続する場合、まず、各接続部ａ～ｄにおける接続端部の拡管を行う。接続端部の拡管は、上記実施形態と同様に、第１拡管工程、第２拡管工程の順に行えば良い。また、図５に示すような接続方式の場合、第１配管１０ａ～第５配管１０ｅの拡管は、それぞれ次のように行えば良い。まず、第１配管１０ａの図中右側端部を拡管する。第２配管１０ｂ、第４配管１０ｄは拡管せず、第３配管１０ｃの両端部を拡管する。第５配管１０ｅについては、図中左側端部を拡管する。このように拡管を行うことにより、各配管の接続と、以下に示すような接続方法の実施が可能となる。 For example, FIG. 5 is a diagram showing an example of connecting five pipes such as the first pipe 10a to the fifth pipe 10e, and has four connection parts (connection parts a to d). When connecting such pipes, first, the connection end portions of the connection portions a to d are expanded. The pipe expansion at the connection end may be performed in the order of the first pipe expansion process and the second pipe expansion process, as in the above embodiment. Further, in the case of the connection method as shown in FIG. 5, the expansion of the first pipe 10a to the fifth pipe 10e may be performed as follows. First, the right end of the first pipe 10a in the figure is expanded. The second pipe 10b and the fourth pipe 10d are not expanded, but both ends of the third pipe 10c are expanded. About the 5th piping 10e, the left end part in a figure is expanded. By performing the pipe expansion in this way, it is possible to connect each pipe and to perform a connection method as shown below.
　上記のようにして、第１配管１０ａから第５配管１０ｅの拡管を行った後、各配管を仮組し、両端に位置する配管の開放端部を閉塞部材１２ａ，１２ｂにより閉塞する。次に、矢印で示す接続部ａにおける部分拡管部２２から、配管内部に燃焼ガスを流入させる。このとき、接続部ｂ～ｄにおける部分拡管部２２は開放されているため、閉塞部材１２ａは擬似的に、部分閉塞された状態と同様な効果を奏することとなる（ガス置換工程）。 As described above, after the first pipe 10a to the fifth pipe 10e are expanded, the pipes are temporarily assembled, and the open ends of the pipes located at both ends are closed by the closing members 12a and 12b. Next, combustion gas is caused to flow into the pipe from the partially expanded portion 22 at the connection portion a indicated by the arrow. At this time, since the partially expanded portion 22 in the connection portions b to d is open, the closing member 12a has a pseudo effect similar to that of the partially closed state (gas replacement step).
　ガス置換工程が終了した後、接続部ａのロウ付けを行う。これにより、第４配管１０ｄと第５配管１０ｅの接続が完了する（ロウ付け工程）。次に、接続部ｂにおける部分拡管部２２から、配管内部へ燃焼ガスを流入させる。本工程では、接続部ｃ、ｄにおける部分拡管部２２から、配管内部の空気と流入させた燃焼ガスとの置換が成されることとなる（ガス置換工程）。 After the gas replacement process is completed, the connection part a is brazed. Thereby, the connection of the 4th piping 10d and the 5th piping 10e is completed (brazing process). Next, the combustion gas is caused to flow into the pipe from the partially expanded portion 22 in the connection portion b. In this step, the air inside the pipe is replaced with the inflowed combustion gas from the partially expanded portion 22 at the connection portions c and d (gas replacement step).
　接続部ｂからのガス置換工程が終了した後、接続部ｂのロウ付けを行う。これにより、第１配管１０ａと第２配管１０ｂの接続が完了する（ロウ付け工程）。接続部ｂのロウ付けが完了した後、接続部ｃにおける部分拡管部２２から燃焼ガスの導入を行い、ガス置換を行う。本工程においては、開放部として残った接続部ｄにおける部分拡管部２２を介して内部空気と燃焼ガスの置換が成される（ガス置換工程）。 After the gas replacement process from the connection part b is completed, the connection part b is brazed. Thereby, the connection of the 1st piping 10a and the 2nd piping 10b is completed (brazing process). After the brazing of the connection part b is completed, the combustion gas is introduced from the partially expanded part 22 in the connection part c, and gas replacement is performed. In this step, the internal air and the combustion gas are replaced through the partially expanded portion 22 in the connection portion d remaining as an open portion (gas replacement step).
　ガス置換工程が終了した後、接続部ｃのロウ付けを行い、第２配管１０ｂと第３配管１０ｃの接続を行う（ロウ付け工程）。接続部ｃのロウ付けを終えた後、配管内には十分に燃焼ガスが充満した状態となっている事が予想される。このため、接続部ｃのロウ付けに次いで、接続部ｄのロウ付けを行い、第３配管１０ｃと第４配管１０ｄの接続を行う（ロウ付け工程）。なお、接続部ｄのロウ付けの前工程として、接続部ｄにおける部分拡管部２２から配管内へ、燃焼ガスを流入させる工程を経ても良い。
　このような方法で複数の配管の接続を行う場合であっても、接続部を個別に見た場合には、接続対象とされる配管は２本であり、上記実施形態と同様な効果を奏する。したがって、上述した複数の配管の接続方法は、本願発明における配管接続方法に含まれる。 After the gas replacement step is completed, the connection portion c is brazed, and the second pipe 10b and the third pipe 10c are connected (brazing step). After the brazing of the connection part c, it is expected that the combustion gas is sufficiently filled in the pipe. For this reason, following the brazing of the connection part c, the connection part d is brazed, and the third pipe 10c and the fourth pipe 10d are connected (brazing process). In addition, as a pre-process before brazing of the connection part d, you may pass through the process of flowing combustion gas into the piping from the partial expansion part 22 in the connection part d.
Even when a plurality of pipes are connected by such a method, when the connection portions are viewed individually, there are two pipes to be connected, and the same effect as in the above embodiment can be obtained. . Accordingly, the above-described pipe connection method is included in the pipe connection method of the present invention.
１０ａ………第１配管、１０ｂ………第２配管、１２………閉塞部材、１４………部分閉塞部材、１６………貫通孔、１８………経路屈曲部材、２０………均等拡管部、２２………部分拡管部、３０………拡管治具、３２………中心部材、３４………拡管ブロック、３６………部分拡管ブロック、３８………ブロックベース、４０………バネ機構、５０………室外機、５２………室内機。
  10a ......... first piping, 10b ......... second piping, 12 ......... blocking member, 14 ......... partial blocking member, 16 ......... through hole, 18 ......... path bending member, 20 ......... Equal expansion portion, 22 ......... Partial expansion portion, 30 ......... Tube expansion jig, 32 ......... Center member, 34 ......... Expansion block, 36 ......... Partial expansion block, 38 ......... Block base, 40 ......... Spring mechanism, 50 ......... Outdoor unit, 52 ......... Indoor unit.

Claims (11)

  1. 　接続端部と開放端部を有する２本の配管のうち、一方の配管における開放端部を閉塞すると共に、他方の配管における開放端部を部分閉塞する閉塞工程と、
    　前記一方の配管における前記接続端部を拡管すると共に前記拡管された接続端部の一部を他の部位よりも外側へ広げて部分拡管部を形成する拡管工程と、
    　前記他方の配管の前記接続端部を前記一方の配管の前記拡管された接続端部に挿入する組付け工程と、
    　前記部分拡管部から前記一方の配管における前記開放端部へ向けて燃焼ガスを流入させると共に、前記他方の配管における前記部分閉塞された開放端部から前記２つの配管内の空気を排出させるガス置換工程と、
    　前記ガス置換工程終了後に前記一方の配管における前記接続端部と前記他方の配管における前記接続端部との隙間を穴埋めするロウ付け工程とを有することを特徴とする配管接続方法。     Among the two pipes having a connection end and an open end, a closing step of closing the open end of one pipe and partially closing the open end of the other pipe;
    Expanding the connection end of the one pipe and expanding a part of the expanded connection end to the outside of the other part to form a partially expanded portion; and
    An assembling step of inserting the connection end of the other pipe into the expanded connection end of the one pipe;
    Gas replacement that allows combustion gas to flow from the partially expanded pipe toward the open end of the one pipe and exhausts air in the two pipes from the partially closed open end of the other pipe Process,
    A pipe connection method comprising: a brazing step of filling a gap between the connection end portion of the one pipe and the connection end portion of the other pipe after the gas replacement step.
  2. 　前記拡管工程は、前記一方の配管における前記接続端部を均等に拡管して均等拡管部を形成する第１拡管工程と、
    　前記第１拡管工程を終了した前記一方の配管における前記均等拡管部の一部をさらに拡管して部分拡管部を形成する第２拡管工程とから成ることを特徴とする請求項１に記載の配管接続方法。     The tube expansion step is a first tube expansion step in which the connection end portion in the one pipe is uniformly expanded to form an equal expansion portion,
    2. The pipe according to claim 1, further comprising a second pipe expanding step in which a part of the uniform pipe expanding portion in the one pipe that has finished the first pipe expanding step is further expanded to form a partial pipe expanding portion. Connection method.
  3. 　前記部分拡管部を前記一方の配管の下側に形成することを特徴とする請求項１に記載の配管接続方法。 2. The pipe connection method according to claim 1, wherein the partially expanded portion is formed below the one pipe.
  4. 　前記部分拡管部を前記一方の配管の下側に形成することを特徴とする請求項２に記載の配管接続方法。 3. The pipe connection method according to claim 2, wherein the partially expanded portion is formed below the one pipe.
  5. 　前記閉塞工程で前記他方の配管における前記開放端部を部分閉塞する際には、前記開放端部の開口面積を絞ると共に、絞られた後の開口部を対地方向へ向けることを特徴とする請求項１に記載の配管接続方法。 When partially closing the open end portion of the other pipe in the closing step, the opening area of the open end portion is narrowed and the narrowed opening portion is directed to the ground direction. Item 2. The pipe connection method according to Item 1.
  6. 　前記閉塞工程で前記他方の配管における前記開放端部を部分閉塞する際には、前記開放端部の開口面積を絞ると共に、絞られた後の開口部を対地方向へ向けることを特徴とする請求項２に記載の配管接続方法。 When partially closing the open end portion of the other pipe in the closing step, the opening area of the open end portion is narrowed and the narrowed opening portion is directed to the ground direction. Item 3. The pipe connection method according to Item 2.
  7. 　前記閉塞工程で前記他方の配管における前記開放端部を部分閉塞する際には、前記開放端部の開口面積を絞ると共に、絞られた後の開口部を対地方向へ向けることを特徴とする請求項３に記載の配管接続方法。 When partially closing the open end portion of the other pipe in the closing step, the opening area of the open end portion is narrowed and the narrowed opening portion is directed to the ground direction. Item 4. The pipe connection method according to Item 3.
  8. 　前記閉塞工程で前記他方の配管における前記開放端部を部分閉塞する際には、前記開放端部の開口面積を絞ると共に、絞られた後の開口部を対地方向へ向けることを特徴とする請求項４に記載の配管接続方法。 When partially closing the open end portion of the other pipe in the closing step, the opening area of the open end portion is narrowed and the narrowed opening portion is directed to the ground direction. Item 5. The pipe connection method according to Item 4.
  9. 　錐体状の中心部材と、
    　前記中心部材の外周上に複数配置されて円筒状の外形を形成すると共に、前記中心部材を錐体の中心軸方向へ移動させることにより外周側へ放射状に押出され、配管端部を拡管して拡管部を形成する拡管ブロックと、
    　前記拡管ブロックにより構成される円筒形状の外周側に、当該外周に対して接離可能に配置され、前記外周に対して接触させた状態で前記中心部材を前記中心軸方向に移動させることで、前記配管に形成された前記拡管部の一部をさらに外側へ広げて部分拡管部を形成する部分拡管ブロックと、を有し、
    　前記部分拡管ブロックが前記拡管ブロックの外周に対して離間状態にあるときには、拡管対象とする配管の少なくとも肉厚分の間隙を備えることを特徴とする拡管治具。     A cone-shaped central member;
    A plurality of cylinders are arranged on the outer periphery of the central member to form a cylindrical outer shape, and the central member is pushed radially outward by moving the central member in the direction of the central axis of the cone, thereby expanding the pipe end. A tube expansion block forming a tube expansion portion;
    On the outer peripheral side of the cylindrical shape constituted by the tube expansion block, it is arranged so as to be able to contact and separate from the outer periphery, and by moving the central member in the central axis direction in a state of being in contact with the outer periphery, A partially expanded block that further expands a part of the expanded portion formed in the pipe to the outside to form a partially expanded portion;
    A tube expansion jig comprising a gap corresponding to at least a thickness of a pipe to be expanded when the partial tube expansion block is in a separated state with respect to an outer periphery of the tube expansion block.
  10. 　前記部分拡管ブロックの前記配管端部への挿入方向長さを、前記拡管ブロックの前記配管端部への挿入方向長さよりも長くしたことを特徴とする請求項９に記載の拡管治具。 The tube expansion jig according to claim 9, wherein the length in the insertion direction of the partial tube expansion block to the pipe end is longer than the length of the tube expansion block in the insertion direction to the pipe end.
  11. 　錐体状の中心部材と、前記中心部材の外周上に複数配置されて円筒状の外形を形成すると共に、前記中心部材を錐体の中心軸方向へ移動させることにより外周側へ放射状に押出され、配管端部を拡管して拡管部を形成する拡管ブロックと、前記拡管ブロックにより構成される円筒形状の外周側に、当該外周に対して接離可能に配置され、前記外周に対して接触させた状態で前記中心部材を前記中心軸方向に移動させることで、前記配管に形成された前記拡管部の一部をさらに外側へ広げる部分拡管部を形成する部分拡管ブロックと、を有し、前記部分拡管ブロックが前記拡管ブロックの外周に対して離間状態にあるときには、拡管対象とする配管の少なくとも肉厚分の間隙を備える拡管治具を用いた拡管方法であって、
    　前記拡管対象とする配管の端部に、前記拡管ブロックを挿入する第１挿入工程と、
    　前記中心部材を移動させて前記端部を均等に拡管して均等拡管部を形成する第１拡管工程と、
    　前記第１拡管工程終了後、前記拡管ブロックの外周に対して前記部分拡管ブロックを接触させた状態の前記拡管ブロックを、前記均等拡管部に挿入する第２挿入工程と、
    　前記中心部材を移動させて前記拡管ブロックを押出し、前記均等拡管部の一部をさらに拡管して部分拡管部を形成する第２拡管工程とを有することを特徴とする拡管治具を用いた拡管方法。     A plurality of cone-shaped central members and a plurality of cylinders arranged on the outer periphery of the central member to form a cylindrical outer shape, and the central member is pushed radially outward by moving the central member in the direction of the central axis of the cone. A pipe expansion block that expands a pipe end portion to form a pipe expansion section, and a cylindrical outer peripheral side constituted by the pipe expansion block is disposed so as to be able to contact with and separate from the outer periphery, and is brought into contact with the outer periphery. A partially expanded block that forms a partially expanded portion that further expands a part of the expanded portion formed in the pipe to the outside by moving the central member in the central axis direction in a state where When the partial pipe expansion block is in a separated state with respect to the outer periphery of the pipe expansion block, it is a pipe expansion method using a pipe expansion jig provided with a gap corresponding to at least the thickness of the pipe to be expanded.
    A first insertion step of inserting the tube expansion block into an end portion of the pipe to be expanded;
    A first tube expansion step of moving the central member to uniformly expand the end portion to form an evenly expanded portion;
    A second insertion step of inserting the tube expansion block in a state in which the partial tube expansion block is in contact with the outer periphery of the tube expansion block after the first tube expansion step into the uniform tube expansion portion;
    A tube expansion tool using a tube expansion jig, comprising: a second tube expansion step of moving the central member to extrude the tube expansion block and further expanding a part of the uniform tube expansion portion to form a partial tube expansion portion. Method.
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