JP2011094655A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint which does not need on-site work and can be applied to a pipe with high rigidity (for example, a steel pipe, a thick pipe, a pipe with a diameter of 20 mm or larger, etc.). <P>SOLUTION: The pipe joint includes sealing materials 12A, 12B mounted between outer peripheral surfaces of pipes 1A, 1B and an inner surface of a joint body 11, taper split rings 14A, 14B mounted to outer surfaces of the pipes 1A, 1B so as to make outer diameters larger toward a connection part of the pipes 1A, 1B, flanges 15A, 15B fitted to outer surfaces of the taper split rings 14A, 14B, and a plurality of tension bolts 16 connecting the flange 15A and the flange 15B for adding tension. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe joint (pipe joint) used when connecting pipes through which gas or oil flows.

  When connecting pipes through which gas or oil flows, pipe joints (pipe joints) are used. At that time, the pipe joint is required to prevent the pipe from coming off or the fluid flowing in the pipe from leaking.

  Various techniques have been disclosed so far in order to prevent such disconnection of piping and leakage of fluid in the pipe.

  For example, in Patent Document 1, a sleeve is attached to the outer surface of a pipe to be connected, and a nut is screwed into a metal fitting (joint body) circumscribing the sleeve, so that the sleeve is deformed radially inward and outer and closely attached to the pipe. By doing so, prevention of pipe dropout and fluid leakage in the pipe is achieved.

  In Patent Document 2, a pipe joint is mounted via an annular protrusion provided on the outer surface of each pipe to be connected, and the pipe is prevented from coming off by tightening with a nut from both sides. At the same time, an O-ring is mounted inside the pipe joint to prevent leakage of fluid in the pipe.

  Further, in Patent Document 3, a pipe drop prevention projection is fixed on the outer surface of each pipe to be connected, and this is sandwiched between two joints from the outside to prevent the pipe from coming off. At the same time, an O-ring is attached inside to prevent leakage of fluid in the pipe.

JP 2005-036946 A JP 2007-064438 A JP 09-296890 A

  However, the techniques described in Patent Documents 1 to 3 have the following problems.

  First, in the technique described in Patent Document 1, since the sleeve is made of metal, it can be deformed by screwing a nut into a soft pipe such as a copper pipe, a thin-walled pipe, a small-diameter pipe (up to about a dozen mm). Limited. Therefore, it cannot be applied to a pipe having high rigidity and hardly deformed (for example, a steel pipe, a thick pipe, a pipe having a diameter of 20 mm or more).

  Moreover, in the technique described in Patent Document 2, an annular protrusion is required on the outer surface of the pipe, and when an already laid pipe (without flange, protrusion, etc.) is connected, on-site processing is required. It takes time and effort. Especially for thick walls, heating equipment is required, and for high places, a work deck is required.

  Moreover, in the technique described in Patent Document 3, a pipe drop prevention protrusion is required on the outer surface of the pipe, and the fixing of the protrusion requires on-site processing as in Patent Document 2. In addition, if there is a misalignment in the pipe to be connected, it is difficult to attach the outermost sleeve, so it can be applied only to soft pipes (for example, copper pipes, small diameter pipes, etc.).

  The present invention has been made in view of the circumstances as described above, and does not require on-site processing, and is also applicable to highly rigid pipes (for example, steel pipes, thick pipes, pipes having a diameter of 20 mm or more, etc.). An object of the present invention is to provide a pipe joint that can be used.

  In order to solve the above problems, the present invention has the following features.

  [1] A pipe joint that connects two pipes, and is installed between a joint body that is installed so as to cover a connection portion between the two pipes, and an outer peripheral surface of the pipe and an inner surface of the joint body. A seal holder that is installed on the outer surface of the pipe to hold the seal material, and a split that is tapered on the outer surface and attached to the outer surface of the pipe so that the outer diameter increases toward the pipe connection. A ring, a flange whose inner surface is tapered to match the tapered shape of the split ring, and a flange that is fitted to the outer surface of the split ring; and a tension bolt that adds tension by connecting the flange to the flange. Piping joints characterized by that.

  [2] The pipe joint according to [1], wherein the tension bolt tightens the seal presser and tightens the seal material.

  [3] The pipe joint according to [1] or [2], wherein a gap is provided between the seal retainer and the pipe.

  [4] The pipe joint according to any one of [1] to [3], wherein the seal material is a gland packing.

  [5] The pipe joint according to any one of [1] to [4], wherein the split ring is provided with a screw or an uneven surface on an inner surface.

  The pipe joint according to the present invention does not require on-site processing, and can also be applied to highly rigid pipes (for example, steel pipes, thick pipes, pipes having a diameter of 20 mm or more, etc.).

It is sectional drawing which shows one Embodiment of this invention. It is an external view which shows one Embodiment of this invention. It is a figure which shows the example of the gland packing used in one Embodiment of this invention. It is a figure which shows the example of the taper split ring used in one Embodiment of this invention.

  A pipe joint according to an embodiment of the present invention will be described below.

  First, in order to solve the problems in Patent Documents 1 to 3 described above, a pipe joint according to an embodiment of the present invention is capable of the following (a) to (d).

  (A) Connection is possible even in a pipe in which no flange or annular protrusion is installed on the outer surface of the pipe.

  (B) Connection is possible even with a pipe having high rigidity and hardly deformed (for example, a steel pipe, a thick pipe, a pipe having a diameter of 20 mm or more).

  (C) Assembly is possible with a hand tool such as a spanner.

  (D) Connection is possible even with pipes with misalignment.

  In order to enable the above (a) to (d), the pipe joint according to the embodiment of the present invention has the following structures (A) to (D).

  (A) In order to prevent the pipe from coming off, a split ring with a tapered outer surface (screws or ruggedness on the inner surface) is attached to the outer surface of the pipe, and this split ring has the same taper as the tapered shape of the split ring. A flange having a shape on the inner surface is fitted, and the flange is pulled with a plurality of (for example, four) bolts. As a result, the flange is fixed to the pipe, and at the same time, the bolt that pulls between the flanges prevents the pipe from coming off due to the wedge effect of the tapered split ring and the tightening and slipping effect on the pipe.

  (B) In order to prevent leakage of the fluid in the pipe, a sealing material (for example, a gland packing) is attached to the outer surface of the pipe to be connected, and this is tightened with a seal presser (for example, a gland packing press) from both sides. The seal retainer is tightened by using a bolt that pulls between the flanges in (A), and the seal member is tightened at the same time that the flange is pulled by the bolt. (Tightening is possible even if leakage from the sealant occurs after long-term use.)

  (C) The total weight of the pipe joint is 15 kg or less, and assembly tools such as common bolt sizes are minimized.

  (D) A gap is provided between the seal presser (for example, gland packing presser) and the pipe according to the situation so that a small amount of misalignment of the pipe to be connected can be absorbed.

  Below, the piping joint which concerns on one Embodiment of this invention as mentioned above is demonstrated based on drawing.

  Here, FIG. 1 is a sectional view of a pipe joint according to this embodiment, and FIG. 2 is an external view thereof. 3 is a view showing an example of a sealing material (for example, gland packing) used in the pipe joint according to this embodiment, and FIG. 4 is a view showing an example of a tapered split ring.

  As shown in FIGS. 1 to 4, the pipe joint 10 according to this embodiment covers the connecting portions (tip portions) of the two pipes 1 </ b> A and 1 </ b> B in order to connect the two pipes 1 </ b> A and 1 </ b> B. The joint body 11 installed in the pipe, the sealing materials 12A and 12B mounted between the outer peripheral surfaces of the pipes 1A and 1B and the inner surface of the joint body 11, and the pipes 1A and 1B so as to press the sealing materials 12A and 12B. The seal retainers 13A and 13B installed on the outer surface of the pipe 1A and 1B are attached to the outer surfaces of the pipes 1A and 1B so that the outer surface is tapered and the outer diameter increases toward the connecting portion (tip portion) of the pipes 1A and 1B. A split ring (taper split ring) 14A, 14B and a flange 15 whose inner surface is tapered to match the tapered shape of the taper split rings 14A, 14B and is fitted to the outer surface of the taper split rings 14A, 14B 15B, a plurality of tension bolts 16 and nuts 17 for connecting the flange 15A and the flange 15B and applying tension, and if necessary, the flanges 15A and 15B are attached to the flanges 15A and 15B to increase the seal pressers 13A and 13B. Seal tightening bolts 18A and 18B to be tightened are provided.

  The tension bolt 16 is also connected to the seal retainers 13A and 13B, and the seal retainers 13A and 13B are tightened to tighten the gland packings 12A and 12B.

  In addition, gaps are provided between the seal retainers 13A and 13B and the pipes 1A and 1B.

  The overall weight of the pipe joint 10 is 15 kg or less, and assembly tools are minimized by sharing bolt sizes.

  With the configuration as described above, in the pipe joint 10 according to this embodiment, the wedges of the taper split rings (with screws or irregularities on the inner surfaces) 14A and 14B are obtained by pulling between the flange 15A and the flange 15B with the tension bolt 16. The pipes 1A and 1B can be prevented from coming off by the effect, the fastening to the pipes 1A and 1B, and the anti-slip effect.

  Further, the leakage of the fluid in the pipe is prevented by the sealing materials 12A and 12B mounted between the outer peripheral surfaces of the pipes 1A and 1B and the inner surface of the joint body 11, and the tension bolts 16 for fastening the sealing materials 12A and 12B. .

  And when assembling the pipe joint 10 according to this embodiment, since no on-site processing such as providing annular projections on the outer surfaces of the pipes 1A and 1B is required, the pipe joint 10 can be assembled even in the case of work at high places. Work with hand tools (spanners, hammers, etc.) and no additional work such as deck installation and tool preparation. In addition, since no fire is used, the safety of gas / oil facilities is improved.

  Furthermore, since gaps are provided between the seal retainers 13A and 13B and the pipes 1A and 1B, connection is possible even if there is a slight misalignment between the pipe 1A and the pipe 1B.

  In this way, the pipe joint 10 according to this embodiment does not require on-site processing, and can also be applied to highly rigid pipes (for example, steel pipes, thick pipes, pipes having a diameter of 20 mm or more, etc.). .

1A, 1B Piping 10 Piping joint 11 Joint body 12A, 12B Seal material 13A, 13B Seal retainer 14A, 14B Taper split ring 15A, 15B Flange 16 Tension bolt 17 Nut 18A, 18B Seal material tightening bolt

Claims (5)

  A pipe joint for connecting two pipes, a joint body installed so as to cover a connection part of the two pipes, and a sealing material mounted between the outer peripheral surface of the pipe and the inner surface of the joint body A seal presser installed on the outer surface of the pipe so as to hold the seal material, a split ring attached to the outer surface of the pipe so that the outer surface is tapered and the outer diameter increases toward the connection portion of the pipe; The inner surface has a taper shape that matches the taper shape of the split ring, and includes a flange that is fitted to the outer surface of the split ring, and a tension bolt that adds tension by connecting the flange to the flange. Characteristic pipe joint.   The pipe joint according to claim 1, wherein the tension bolt fastens the seal presser and tightens the seal material.   The pipe joint according to claim 1 or 2, wherein a gap is provided between the seal retainer and the pipe.   The pipe joint according to any one of claims 1 to 3, wherein the seal material is a gland packing.   The pipe coupling according to any one of claims 1 to 4, wherein the split ring has an inner surface provided with a screw or an uneven surface.

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