JP2019086144A - Pipe joint and pipe connection structure - Google Patents

Abstract

To reduce the weight of a pipe joint, and save material.SOLUTION: A pipe joint 100 is composed of a combination of a first joint member 110 and a second joint member 120. The first joint member 110 comprises a fastening part 111 screwing pipes 1, 2, a flange part 112 provided around the fastening part 111, and a first cylinder part 113 erected at a peripheral end of the flange part 112, wherein the flange part 112 is provided with a plurality of first bolt open holes 114. The second joint member 120 comprises: a doughnut-shaped lid member 123 that has a central opening part 121 inserting the pipes 1, 2 therein, and a plurality of second bolt open holes 122, and that covers an upper end opening part of the first cylinder 113; and a second cylinder 124 erected at a peripheral end of the lid part 123, and fitted to the first cylinder part 113. A cavity part 130 surrounded by the first joint member 110 and the second joint member 120 is formed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pipe joint and a pipe connection structure for fastening two pipes, and more particularly to a pipe joint and a pipe connection structure having a structure which enables weight reduction and material saving.

  In general, a screw-in type flanged pipe joint is a pipe joint having a flange provided at a joint portion with a pipe end and tightened by a bolt and a nut inserted through a through hole of the flange. Used when pressure is high.

  In Patent Document 1, a fastening portion for screwing and fastening a pipe end of a steel pipe and a flange portion corresponding to a weir provided with a plurality of through holes for inserting a bolt are integrated, and the center of the fastening portion is There is described a pipe joint having a tapered female thread on the inner surface of the opening and into which the tapered male thread cut at the end of the pipe to be connected is to be screwed. ing.

Japanese Patent Application Laid-Open No. 9-60774

  However, the pipe joint described in Patent Document 1 has a problem that it is difficult to achieve weight reduction and material saving because the flange body is formed of a thick donut shaped plate-like body. .

In view of the above problems, the invention according to claim 1 is a pipe joint (100) formed by combining a first joint member (110) and a second joint member (120),
The first joint member (110) is provided with a tubular fastening portion (111) for screwing in a pipe (1, 2), and a plurality of first bolt through holes provided around the fastening portion (111) A donut shaped flange portion (112) having (114); and a first cylindrical portion (113) erected at the peripheral end of the flange portion (112);
The second joint member (120) has a plurality of second openings respectively corresponding to the central opening (121) through which the pipe (1, 2) is inserted and the plurality of first bolt through holes (114). A donut shaped lid portion (123) having a bolt through hole (122) and covering the upper end opening portion of the first cylindrical portion (113) and a circumferential end of the lid portion (123) A second cylindrical portion (124) fitted to the inner surface of the first cylindrical portion (113); and surrounded by the first joint member (110) and the second joint member (120) It is characterized by having a hollow portion (130).

  According to the invention of claim 1, the first joint member (110) and the second joint member (120) are combined to constitute one pipe joint, and a hollow portion (130 is surrounded by these joint members. Can be used for weight reduction and material savings. Further, these joint members can be easily manufactured by press processing, and furthermore, dimensional accuracy can be improved as compared with the case of manufacturing by casting etc. as in the conventional pipe joint. Furthermore, by combining these joint members, the rigidity can be enhanced while providing the hollow portion (130).

The invention according to claim 3 is a pipe joint (100A) formed by combining a first joint member (110) and a plurality of second joint members (120A),
The first joint member (110) is provided with a tubular fastening portion (111) for screwing in a pipe (1, 2), and a plurality of first bolt through holes provided around the fastening portion (111) (114) and a donut shaped flange portion (112), and a first cylindrical portion (113) erected at the peripheral end of the flange portion (112),
The plurality of second joint members (120A) includes a second cylindrical portion (127) having a second bolt through hole (126), and the first bolt is on the flange portion (112). It has a cavity (130A) separately disposed apart from each other at a position corresponding to the through hole (114) and surrounded by the first joint member (110) and the plurality of second joint members (120A). It is characterized by

  According to the third aspect of the present invention, the first joint member (110) and the plurality of second joint members (120A) are combined to constitute one pipe joint, and the plurality of second joint members (120A) In the present invention, the weight and the material can be further reduced as compared with the first aspect of the invention because they are separately disposed separately from each other on the flange portion (112).

  The invention according to claim 7 is a pipe connection structure configured using the pipe joint (100) according to the invention according to claim 1, and a pair of pipe joints of the same type at the pipe ends of two pipes (1, 2) (100) and (100) are respectively fastened, and a pair of pipe joints (100) and (100) are tightened by a bolt (3) and a nut (4).

  The invention according to claim 8 is a pipe connection structure configured using the pipe joint (100A) according to the invention according to claim 3, and a pair of pipe joints of the same type at the pipe ends of two pipes (1, 2) (100A) and (100A) are respectively fastened, and a pair of pipe joints (100A) and (100A) are tightened by a bolt (3) and a nut (4).

  According to the pipe joint and the pipe connection structure of the present invention, since the two joint members are combined and the hollow portion surrounded by the joint members is provided, weight reduction and material saving can be achieved.

  Further, the two joint members can be easily manufactured by press processing, and furthermore, the dimensional accuracy can be improved as compared with the case of manufacturing by casting etc. as in the conventional pipe joint. Furthermore, by combining the two joint members, the rigidity of the pipe joint can be enhanced while providing the hollow portion.

It is the top view and front view of the pipe joint and pipe connection structure in the 1st Embodiment of this invention. It is sectional drawing in the XX line of FIG. 1 (a). It is an exploded perspective view of a pipe joint in a 1st embodiment of the present invention. It is the top view and front view of the pipe joint and pipe connection structure in the 2nd Embodiment of this invention. It is a disassembled perspective view of the pipe joint in the 2nd Embodiment of this invention. It is the top view and front view in the connection structure of the pipe | tube in which the flange was provided. It is sectional drawing in the ZZ line of Fig.6 (a). It is the top view and front view of a pipe joint and pipe connection structure in which the stopper part was provided. It is sectional drawing in the YY line of Fig.8 (a). It is sectional drawing of the connection structure (without a packing material) of the pipe | tube in which the flange was provided. It is sectional drawing of the connection structure (with packing material) of the pipe in which the flange was provided.

First Embodiment
Next, a pipe joint 100 and a pipe connection structure in a first embodiment of the present invention will be described based on FIGS. 1 to 3. FIG. 1 (a) is a plan view of the pipe joint 100, and FIG. 1 (b) is a front view thereof, each showing a state in which two pipes 1 and 2 are fastened by a pair of pipe joints 100 and 100. It is a thing. FIG. 2 is a cross-sectional view taken along line X-X of FIG. FIG. 3 is an exploded perspective view of one fitting 100. In addition, in FIG. 3, in order to make a figure legible, illustration of nut 4 of this side is abbreviate | omitted.

  As shown in FIG. 1, a pipe connection structure is formed by fastening a pair of pipe joints 100, 100 of the same type to the pipe ends of the two pipes 1, 2 respectively. The pair of pipe joints 100, 100 are tightened by the bolts 3 and the nuts 4 inserted into the plurality of through holes. The pipes 1 and 2 are used, for example, as pipes for transporting gases such as steam and air, fluids such as water and oil, powders, and granules.

  The structure of the pipe joint 100 will be described based on FIGS. 2 and 3. The pipe joint 100 is configured by combining the first joint member 110 and the second joint member 120. The first joint member 110 has a cylindrical fastening portion 111 for screwing in the pipes 1 and 2, a donut shaped flange portion 112 provided to be extended around the fastening portion 111, and a circumferential end of the flange portion 112. A plurality of, for example, four first cylindrical portions 113 are provided, which are erected and configured to include a first cylindrical portion 113 that forms a fitting portion with the second joint member 120, and are equally spaced along the circumferential direction of the flange portion 112. A bolt through hole 114 is provided.

  In addition, a tapered female thread is provided on the inner surface of the central opening of the cylindrical fastening part 111, and the tapered male thread engraved on the end of the pipe 1, 2 to be connected to this tapered female thread is screwed. It is supposed to be introduced. In this case, it is preferable to provide a bolt guide cylinder portion 115 provided on the inner surface side of the flange portion 112 and in communication with the first bolt through hole 114 to guide the bolt 3.

  On the other hand, the second joint member 120 has a central opening 121 through which the pipes 1 and 2 are inserted, and a plurality of second bolt through holes 122 respectively corresponding to the plurality of first bolt through holes 114. A donut shaped cover portion 123 covering the upper end opening of the first cylindrical portion 113, and a second cylindrical portion 124 erected on the circumferential end of the cover portion 123 and fitted on the inner surface of the first cylindrical portion 113. And.

  In FIG. 2, although the upper end surface of the above-mentioned bolt guide cylinder 115 is positioned lower than the inner surface of the donut-shaped lid 123, the upper end surface is made to contact the inner surface of the lid 123 or the first bolt of the lid 123 The lid portion 123 may be penetrated through the through hole 114. In addition to the ability to perform position alignment of the volt | bolt 3 with sufficient precision by comprising in this way, the rigidity of the pipe joint 100 and intensity | strength can be raised.

  A hollow portion 130 surrounded by the first joint member 110 and the second joint member 120 is formed inside the pipe joint 100. The joint member 110 and the second joint member 120 are fitted together at the fitting portion of the first cylindrical portion 113 and the second cylindrical portion 124. In this case, by providing the third cylindrical portion 125, which is provided upright on the peripheral end of the lid 123 central opening 121 constituting the second joint member 120 and fitted on the outer surface of the fastening portion 111, it is made stronger. The first joint member 110 and the second joint member 120 can be fitted together.

  As described above, the first and second joint members 110 and 120 basically have a bottomed cylindrical body provided with a central opening through which the pipe ends of the pipes 1 and 2 pass and bolt through holes. The pipe joint 100 is configured by fitting the first and second joint members 110 and 120 together. And since the hollow part 130 was provided in the inside of the pipe joint 100, the weight reduction and the saving of material can be achieved.

  Further, since the first and second joint members 110 and 120 are provided with a central opening and a bolt through hole in a bottomed cylindrical body, they can be easily manufactured by press processing, and further, The dimensional accuracy can be improved as compared with the case of manufacturing by casting or the like as in the pipe joint of the above. Furthermore, by fitting the first and second joint members 110 and 120, the rigidity can be enhanced while providing the hollow portion 130.

Second Embodiment
Next, a pipe joint 100A and a pipe connection structure in a second embodiment of the present invention will be described based on FIGS. 4 and 5. FIG. FIG. 4 (a) is a plan view of the pipe joint 100A, and FIG. 4 (b) is a front view thereof, each showing a state in which two pipes 1 and 2 are fastened by a pair of pipe joints 100A and 100A. It is a thing. FIG. 5 is an exploded perspective view of one pipe joint 100A. The cross-sectional view along the line Y-Y in FIG. 4A is the same as that in FIG. 2 in the first embodiment. In FIG. 5, the front nut 4 and the second joint member 120A are not shown for the sake of clarity.

  The pipe joint 100A is configured by combining the first joint member 110 and the plurality of second joint members 120A. A different point from the pipe joint 100 of the first embodiment is that a plurality of cylindrical second joint members corresponding to the plurality of first bolt through holes 114 provided in the first joint member 110 120A are provided separately from each other. The plurality of second joint members 120A are provided with a second cylindrical portion 127 having a second bolt through hole 126, and on the flange portion 112 at a position corresponding to the first bolt through hole 114. They are arranged separately from each other.

  Strictly speaking, the second cylindrical portion 127 has a second bolt through hole 126 opened at the center of the bottom surface of the bottomed cylindrical body, and the bottom surface is disposed on the flange surface of the flange portion 112. Then, the first bolt through hole 114 and the bolt guide cylinder 115 are covered. Then, the pipe joint 100A has a hollow portion 130A surrounded by the first joint member 110 and the plurality of second joint members 120A.

  In FIG. 2, although the upper end surface of the above-mentioned bolt guide cylinder part 115 is located lower than the inner surface of the 2nd cylinder part 127, it is made to contact the inner surface of the 2nd cylinder part 127, or the 2nd cylinder part The second cylindrical portion 127 may be penetrated through the 127 second bolt through holes 126. In addition to the ability to perform position alignment of the volt | bolt 3 with sufficient precision by comprising in this way, the rigidity of 100 A of pipe joints and intensity | strength can be raised.

  As described above, according to the present embodiment, the first joint member 110 and the plurality of second joint members 120A are combined to constitute one pipe joint 100A, and the plurality of cylindrical second joint members are formed. Since the 120A are separately disposed on the flange portion 112 separately from each other, the total weight of the plurality of second joint members 120A is smaller than the weight of the second joint member 120 in the first embodiment. It is possible to reduce the weight and the material cost.

  Further, since the first joint member 110 and the plurality of second joint members 120A are provided with the central opening and the bolt through hole in the bottomed cylindrical body, they can be easily manufactured by press processing. Furthermore, the dimensional accuracy can be improved as compared with the case of manufacturing by casting etc. as in the conventional pipe joint. Furthermore, by fitting the first and the plurality of second joint members 110 and 120A, the rigidity can be enhanced while providing the hollow portion 130A.

<About the connection structure of the pipe provided with the flange>
In the first and second embodiments, the pipe joints 100 and 100A fasten the pipes 1 and 2 having no flanges at the pipe ends, but the invention is not limited thereto. For example, the pipe joints 100 and 100A can also be used for fastening pipes 1A and 2A provided with flanges 5 and 6 at the pipe ends as shown in FIGS.

  FIG. 6 (a) is a plan view of the pipe joint 100 and the pipe connection structure in this case, and FIG. 6 (b) is a front view thereof, each of which is a pair of pipe joints 100 and 100 in the first embodiment. It shows a state in which two pipes 1A, 2A are fastened. FIG. 7 is a cross-sectional view taken along the line Z-Z of FIG. The tube ends of the two tubes 1A and 2A are joined so that the flanges 5 and 6 face each other.

  Then, the pair of pipe joints 100, 100 are tightened by the bolt 3 and the nut 4 so as to sandwich the flanges 5, 6. Since the two pipes 1A and 2A are fastened by tightening the flanges 5 and 6, the tapered female threads of the fastening portion 111 of the first joint member 110 and the tapered male threads of the ends of the tubes 1 and 2 are It is unnecessary.

  Moreover, in this pipe connection structure, in place of the pipe joint 100 in the first embodiment, the pipe joint 100A in the second embodiment can be used similarly.

<About the deformation prevention structure of pipe joint>
As described above, in the first and second embodiments, a pair of pipe joints of the same type are respectively fastened to the pipe ends of the two pipes 1 and 2, and a pair of pipe joints are inserted into a plurality of through holes It is configured to be tightened by the bolt 3 and the nut 4. In this case, if the tightening of the pair of pipe joints is too strong in the on-site work, the pipe joints have the hollow portions 130 and 130A, so there is a possibility that connection failure due to deformation of the pipe joint body may occur. In addition, in order to prevent fluid leakage from the joint of pipes 1 and 2, in many cases clamping is performed by sandwiching annular packing material 140 between a pair of pipe joints, but if this tightening is too strong packing material 140 may be excessively compressed to cause breakage such as breakage of the packing material 140.

  Then, the structure for solving these problems is demonstrated below. First, as shown in FIGS. 8 and 9, in the pipe joint 100 according to the first embodiment, an annular shape is provided between the pipe joints 100 and 100 and inside the first and second bolt through holes 114 and 122. The packing material 140 is sandwiched, and the pipe joints 100 and 100 are tightened with the bolt 3 and the nut 4.

  In this case, for each of the pair of pipe joints 100, on the outer surface of the flange portion 112 of the first joint member 110, a projecting stopper portion 116 for stopping the tightening of the pipe joint body by the bolt 3 and the nut 4; 116 are provided at mutually opposing positions.

  The shapes of the stopper portions 116, 116 are in the form of protrusions when viewed from the front view of FIG. 8B and the cross-sectional view of FIG. 9, but when viewed from the plan view of FIG. It has an annular shape along the circumferential edge. The stoppers 116 and 116 may be disposed on the outer side of the packing material 140, and the planar shape is not limited to an annular shape, but the annular shape distributes the pressure due to tightening evenly in the circumferential direction. can do.

  At the time of bolt tightening, a gap is generated in the area where there is no packing material 140 between the pipe joints 100 and 100, but when the tips of the pair of stoppers 116 and 116 abut, the tightening is stopped and excessive tightening is prevented. Thus, it is possible to suppress deformation of the pipe joints 100 and 100 and breakage of the packing material 140.

  In addition, by providing the reinforcing cylinder portion 117 in the pipe joint 100, it is possible to prevent the pipe joint 100 from being deformed. The bolt guide cylinder portion 115 is inserted into the reinforcing cylinder portion 117, the upper end surface of the reinforcing cylinder portion 117 contacts the inner surface of the lid portion 123, and the lower end surface contacts the inner surface of the flange portion 112. Such a deformation preventing structure of the pipe joint can be adopted also for the pipe joint 100A of the second embodiment.

  Moreover, the deformation preventing structure of the pipe joint can be similarly adopted for fastening the pipes 1A and 2A provided with the flanges 5 and 6 at the pipe ends. That is, in the pipe joint for fastening the pipes 1A and 2A in which the flanges 5 and 6 are provided at the pipe end, the stopper portion 116 and the reinforcing cylinder portion 117 are provided. FIG. 10 shows a structure in which the packing material 140 is not sandwiched, and FIG. 11 shows a structure in which the packing material 140 is sandwiched between the flanges 5 and 6. 10 and 11 correspond to cross-sectional views taken along the line ZZ in FIG.

  In the structure of FIG. 10, a gap corresponding to the thickness of the flanges 5 and 6 is generated between the pipe joints 100 and 100, and the stopper portions 116 and 116 are disposed in this gap. The stoppers 116 and 116 are in contact with each other when the bolt is tightened. On the other hand, in the structure of FIG. 11, since the packing material 140 is sandwiched, the gap between the pipe joints 100, 100 is wider than in the structure of FIG. 10, and the stopper portions 116, 116 It is formed high.

  The stopper portion 116 may be provided only on one of the opposing pipe joints 100 and 100 (100A and 100A). In each of the above-described embodiments, the tubes 1, 2, 1A, and 2A include various tubes made of steel (iron), non-ferrous metals, resins, and the like as the material. Moreover, steel (iron), a nonferrous metal, resin etc. shall be contained as a material of pipe joint 100, 100A.

1, 2 pipe 3 bolt 4 nut 100, 100A pipe joint
110 first joint member 111 fastening portion 112 flange portion 113 first cylindrical portion 114 bolt through hole 115 bolt guide cylindrical portion 116 stopper portion 117 reinforcing cylindrical portion 120, 120A second joint member 121 central opening 122 second opening Bolt through hole 123 Donut-shaped lid portion 124 Second cylindrical portion 125 Third cylindrical portion 126 Second bolt through hole 127 Second cylindrical portion 130, 130A Hollow portion 140 Packing material

In view of the above problems, the invention according to claim 1 is a pipe joint (100A) formed by combining a first joint member (110) and a plurality of second joint members (120A),
The first joint member (110) is provided with a tubular fastening portion (111) for screwing in a pipe (1, 2), and a plurality of first bolt through holes provided around the fastening portion (111) (114) and a donut shaped flange portion (112), and a first cylindrical portion (113) erected at the peripheral end of the flange portion (112),
The plurality of second joint members (120A) includes a second cylindrical portion (127) having a second bolt through hole (126), and the first bolt is on the flange portion (112). It has a cavity (130A) separately disposed apart from each other at a position corresponding to the through hole (114) and surrounded by the first joint member (110) and the plurality of second joint members (120A). It is characterized by

According to the invention of claim 1 , the first joint member (110) and the plurality of second joint members (1
20A) are combined to form one pipe joint, and the plurality of second joint members (120A) are
Since they are disposed separately from each other on the flange portion (112), weight reduction and material saving can be further achieved as compared with the invention according to claim 1.

The invention according to claim 4 is a pipe connection structure configured using the pipe joint (100A) according to the invention according to claim 1 , and a pair of pipe joints of the same type at the pipe ends of two pipes (1, 2) (100A),
(100A) is fastened, and a pair of pipe joints (100A) and (100A) are tightened by a bolt (3) and a nut (4).

Claims (9)

A pipe joint (100) formed by combining a first joint member (110) and a second joint member (120), the pipe joint comprising:
The first joint member (110) is
A cylindrical fastening portion (111) for screwing in the pipe (1, 2);
A donut shaped flange portion (112) provided around the fastening portion (111) and having a plurality of first bolt through holes (114);
And a first cylindrical portion (113) erected at the circumferential end of the flange portion (112),
The second joint member (120) is
A central opening (121) for inserting the pipe (1, 2); and a plurality of second bolt through holes (122) respectively corresponding to the plurality of first bolt through holes (114); A donut-shaped lid (123) covering an upper end opening of the first cylinder (113);
And a second cylindrical portion (124) erected on the circumferential end of the lid portion (123) and fitted on the inner surface of the first cylindrical portion (113); and the first joint member (110) And a second joint member (120) having a hollow portion (130) enclosed therein.   A third cylindrical portion (standing on the circumferential end of the central opening (121) of the lid (123) constituting the second joint member (120) and fitting on the outer surface of the fastening portion (111) The pipe joint according to claim 1, further comprising: 125). A pipe joint (100A) formed by combining a first joint member (110) and a plurality of second joint members (120A),
The first joint member (110) is
A cylindrical fastening portion (111) for screwing in the pipe (1, 2);
A donut shaped flange portion (112) provided around the fastening portion (111) and having a plurality of first bolt through holes (114);
And a first cylindrical portion (113) erected at the circumferential end of the flange portion (112),
The plurality of second joint members (120A) are
A second cylindrical portion (127) having a second bolt through hole (126);
The first joint member (110) and the plurality of second joint members are separately disposed on the flange portion (112) separately from each other at positions corresponding to the first bolt through holes (114). A pipe joint characterized by having a hollow portion (130A) surrounded by (120A).   The bolt guide cylinder (115) provided on the inner surface side of the flange (112) and in communication with the first bolt through hole (114) is provided. Fittings described.   The bolt guide cylinder (115) is inserted, and the upper end surface is in contact with the inner surface of the lid (123), and the lower end surface is in contact with the inner surface of the flange 112; The pipe joint according to claim 4, characterized in that:   The outer surface of the flange portion (112) is provided with a projecting stopper portion (116) for stopping tightening of a pipe joint body by a bolt (3) and a nut (4). The pipe fitting according to any one. A pair of pipe joints (100, 100) of the same type are fastened to the pipe ends of the two pipes (1, 2) respectively, and the pipe joints (100, 100) are tightened by the bolt (3) and the nut (4) In the tube connection structure
The pipe joint (100) is a pipe joint formed by combining a first joint member (110) and a second joint member (120),
The first joint member (110) is
A cylindrical fastening portion (111) for screwing in the pipe (1, 2);
A donut shaped flange portion (112) provided around the fastening portion (111) and having a plurality of first bolt through holes (114);
And a first cylindrical portion (113) erected at the circumferential end of the flange portion (112),
The second joint member (120) is
A central opening (121) for inserting the pipe (1, 2); and a plurality of second bolt through holes (122) respectively corresponding to the plurality of first bolt through holes (114); A donut-shaped lid (123) covering an upper end opening of the first cylinder (113);
And a second cylindrical portion (124) erected on the circumferential end of the lid portion (123) and fitted on the inner surface of the first cylindrical portion (113); and the first joint member (110) And a hollow portion (130) surrounded by the second joint member (120). A pair of pipe joints (100A, 100A) of the same type are fastened to the ends of two pipes (1, 2) respectively, and a pair of pipe joints (100A, 100A) are tightened by bolts (3) and nuts (4) In the tube connection structure
The pipe joint (100A) is a pipe joint formed by combining a first joint member (110) and a plurality of second joint members (120A),
The first joint member (110) is
A cylindrical fastening portion (111) for screwing in the pipe (1, 2);
A donut shaped flange portion (112) provided around the fastening portion (111) and having a plurality of first bolt through holes (114);
And a first cylindrical portion (113) erected at the circumferential end of the flange portion (112),
The plurality of second joint members (120A) are
A second cylindrical portion (127) having a second bolt through hole (126);
The first joint member (110) and the plurality of second joint members are separately disposed on the flange portion (112) separately from each other at positions corresponding to the first bolt through holes (114). A pipe connection structure characterized by having a cavity (130A) surrounded by (120A).   When the pipe joint body is tightened by the bolt (3) and the nut (4) on the outer surface of the flange portion (112), the pipe joint body by the bolt (3) and the nut (4) is formed on the outer surface of the flange portion (112) 9. The tube connection structure according to claim 7, further comprising a protruding stopper portion (116) for stopping the tightening at the time of tightening.

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