JP2006250341A - Pipe connecting method and pipe connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe connecting method and a pipe connecting structure capable of generating connection simply without resorting to the welding process or thread cutting process while the configuration remains compact. <P>SOLUTION: Flares 2 of 180 degs. are formed at the ends of two pipes 1 and 1a, and a sleeve 3 having a tapered flange 4 is fitted on each pipe 1/1a, and a gasket 5 is pinched between the two flared parts 2, whereby the pipes 1 and 1a are connected together by fastening the tapered flanges 4 of the two sleeves 3 with a clamp 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pipe connection method and a pipe connection structure for connecting pipes in pipe piping.

Conventionally, there is a clamp-type joint in which a ferrule is welded to a pipe end of a pipe to be connected, a gasket is sandwiched between both ferrules, and both ferrules are clamped to connect the pipe. There are various types of clamps, from low pressures that can be easily and quickly attached and removed with a thumbscrew to high pressures that are tightened with bolts and nuts. In addition to the welding type in which a ferrule is welded to the pipe end, there is a type (expanding type) in which a ferrule is screwed into the pipe end (see Non-Patent Document 1).
Further, as shown in FIG. 3, as a pipe end flange joint, a loose flange 22 is inserted into the pipes 21 and 21a to be connected, the pipe end is ribbed, a packing 24 is sandwiched between both ribs 23, and loose. There are some which connect the pipes 21 and 21a by tightening the flange 22 with bolts 25 and nuts 25.
“SANITARY STAINLESS-STEEL”, Osame Kogyo Co., Ltd. catalog, September 1998, p. 9

The clamp type joint is superior to the general flange welded type or screwed type joint in that it can be easily piped by clamping, but it is necessary to weld or screw a dedicated ferrule to the pipe end. There is a problem that the number of welding processes and threading processes are required.
The pipe end spout joint has a problem in that it takes time to tighten the loose flange because it is necessary to tighten the loose flange with a large number of bolts and nuts when connecting the pipes.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a pipe joining method and a pipe connection mechanism that can be easily connected without requiring welding and threading.

The present invention is a pipe connection method for connecting pipes to each other, wherein a 180 degree flare is formed at the pipe ends of the two pipes, and a sleeve having a tapered flange portion is inserted on the outer periphery of the pipes. It is characterized in that a seal is sandwiched between flares and the tapered flange portions of both sleeves are tightened with clamps.
The present invention is a pipe connection method for connecting pipes to each other, wherein a lap joint is welded to the pipe ends of two pipes, a sleeve having a tapered flange portion is inserted on the outer periphery of the pipe, and both the lap joints are connected. It is characterized by sandwiching a seal between them and tightening the taper flange portions of both sleeves with a clamp.
The present invention is a pipe joint structure for connecting pipes to each other, and includes two pipes in which a flare of 180 degrees is formed at the pipe end, a sleeve inserted on the outer periphery of the pipe, and the two flares. It is composed of a sandwiched seal and a clamp for tightening both sleeves, and the sleeve is composed of a cylindrical portion inserted into the outer periphery of the tube and a tapered flange portion formed at the end of the cylindrical portion. .
It is preferable that the outer diameters of the flare and the seal are substantially the same.
A concave portion into which the flare is inserted is formed on the mating surface side of the tapered flange portion, the inner diameter of the concave portion is substantially the same as the outer diameter of the flare, and the depth dimension of the concave portion is the thickness of the flare. It is preferably slightly larger than this.
The present invention is a pipe joint structure for connecting pipes to each other, and is sandwiched between two pipes having a lap joint welded to a pipe end, a sleeve inserted into the outer periphery of the pipe, and both lap joints. The sleeve includes a seal and a clamp that clamps both sleeves. The sleeve includes a cylindrical portion that is inserted into the outer periphery of the tube, and a tapered flange portion that is formed at an end of the cylindrical portion.

  In the pipe connection method and the pipe connection structure according to the present invention, there is no need to weld or screw a ferrule to the pipe end as in the conventional clamp-type joint, and the clamp mechanism is adopted, so that the piping work can be performed. It becomes easy.

Embodiments of the present invention will be described based on examples with reference to the drawings.
FIG. 1 is a cross-sectional view showing a pipe connection structure according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the pipe connection structure shown in FIG.
As shown in FIGS. 1 and 2, the pipe connection structure of the present invention is inserted into two pipes 1 and 1a in which a 180 degree flare 2 is formed at the pipe end and the outer periphery of the pipes 1 and 1a. It comprises a sleeve 3, a gasket 5 sandwiched between both flares 2, and a clamp 6 for tightening both sleeves 3.
The sleeve 3 includes a cylindrical portion 3a inserted into the outer periphery of the pipes 1 and 1a, and a tapered flange portion 4 formed at the end of the cylindrical portion 3a.
The outer diameters of the flare 2 and the gasket 5 are substantially the same.
A concave portion 4 a into which the flare 2 is inserted is formed on the mating surface side of the tapered flange portions 4 of the sleeves 3, and the inner diameter of the concave portion 4 a is substantially the same as the outer diameter of the flare 2.
The depth of the recess 4a is slightly larger than the thickness of the flare 2 so that a part of the gasket 5 enters the recess 4a so that the gasket 5 can be positioned. Further, when the gasket 5 is sandwiched between the two flares 2 and the taper flange portions 4 of both sleeves 3 are tightened with the clamps 6, a gap is formed on the mating surface side of the taper flange portions 4 to enable predetermined tightening of the gaskets. It is a dimension.
The clamp 6 includes links 7 and 7a divided into two and a pin 8 connecting the links 7 and 7a. One link 7 has an eye bolt 9 for tightening and a wing nut screwed into the eye bolt 9. 10 is attached, and a groove 11 corresponding to the eyebolt 9 is formed in the other link 7a.

Next, the pipe connection method will be described.
A sleeve 3 is inserted in advance on the outer periphery of the two pipes 1 and 1a to be connected, and a flare 2 having a 180 degree is formed at the end of the pipe. When the pipes 1 and 1a are straight pipes, the sleeve 2 is inserted after the flare 2 of 180 degrees is formed at the pipe end.
Next, both sleeves 3 are slid and put on the back of the flare 2 of the tubes 1, 1 a, and a gasket is sandwiched between the two flares 2. Next, as shown in FIG. 1, the taper portions of the links 7 and 7 a of the clamp 6 are set on the outer periphery of the taper flange portion 4 of both sleeves 3.
Next, when the links 7 and 7a are tightened with the wing nut 10, the taper flange portions 4 of both sleeves 3 are tightened, and the flare 2 of both the tubes 1 and 1a compresses the gasket 5, and the one tube 1 and the other The tube 1a is firmly connected. Further, the airtightness of the internal fluid is maintained by the gasket 5.
In the said Example, although the pipe | tube which formed the flare of 180 degree | times at the pipe end is used, the pipe | tube which welded the lap joint to the pipe end can also be used as needed.

  It is sectional drawing which shows the pipe connection structure of one Example of this invention.   It is a disassembled perspective view of the pipe connection structure shown in FIG.   It is sectional drawing of the pipe end swivel joint of a prior art example.

Explanation of symbols

1, 1a Pipe 2 Flare 3 Sleeve 3a Cylindrical part 4 Taper flange part 4a Recessed part 5 Gasket (seal)
6 Clamp 7, 7a Link 8 Pin 9 Eye bolt 10 Wing nut 11 Groove

Claims (6)

  A pipe connection method for connecting a pipe (1) and a pipe (1a), wherein a 180 degree flare (2) is formed at the pipe ends of the two pipes (1, 1a), and the pipe (1, 1a) A sleeve (3) having a taper flange portion (4) is inserted into the outer periphery of the sleeve, a seal (5) is sandwiched between the flares (2), and the taper flange portion (4) of both sleeves (3) is clamped (6 A pipe connection method characterized by tightening with a).   A pipe connection method for connecting a pipe (1) and a pipe (1a), wherein a lap joint is welded to the pipe ends of two pipes (1, 1a), and a taper flange is provided on the outer circumference of the pipe (1, 1a). Insert the sleeve (3) having the portion (4), sandwich the seal (5) between the lap joints (2), and tighten the taper flange portion (4) of both sleeves (3) with the clamp (6). A pipe connection method characterized by the above.   A pipe joint structure for connecting a pipe (1) and a pipe (1a), two pipes (1, 1a) having a 180 degree flare (2) formed at the end of the pipe, and the pipes (1, 1a) ) Is inserted into the outer periphery of the sleeve (3), a seal (5) sandwiched between the two flares (2), and a clamp (6) for tightening both sleeves (3). A pipe connection structure comprising a cylindrical part (3a) inserted into the outer periphery of the pipe (1, 1a) and a tapered flange part (4) formed at an end of the cylindrical part (3a).   4. The pipe connection structure according to claim 3, wherein the outer diameters of the flare (2) and the seal (5) are substantially the same.   A concave portion (4a) into which the flare (2) is inserted is formed on the mating surface side of the tapered flange portion (4), and the inner diameter of the concave portion (4a) is substantially equal to the outer diameter of the flare (2). The pipe connection structure according to claim 3 or 4, characterized in that they are the same and the depth dimension of the recess (4a) is slightly larger than the thickness of the flare (2).   A pipe joint structure for connecting a pipe (1) and a pipe (1a), two pipes (1, 1a) having a lap joint welded to the pipe end, and being inserted into the outer periphery of the pipe (1, 1a) Comprising a sleeve (3) to be clamped, a seal (5) sandwiched between both lap joints, and a clamp (6) for tightening both sleeves (3), said sleeve (3) comprising pipes (1, 1a) A pipe connection structure comprising a cylindrical portion (3a) inserted into the outer periphery and a tapered flange portion (4) formed at an end of the cylindrical portion (3a).

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