Expansion joint device and method for assembling expansion joint device

Abstract

The present invention absorbs offset in the axial direction and the radial direction between a first pipe flange and a second pipe flange. An expansion joint device (10) is provided with a first joint pipe (11) and a second joint pipe (21). The second joint pipe (21) has a second joint pipe body (22) and an eccentric flange (23). An aligning flange (30) is provided on the outer periphery of the eccentric flange (23) so as to be slidable in the rotational direction, and a plurality of bolt holes (35) are eccentrically formed in the aligning flange (30).

Description

Technical Field

[0001] The present disclosure relates to an expansion joint device for connecting a first pipe flange and a second pipe flange and an assembly method of the expansion joint device, and in particular to an expansion joint device and an assembly method of the expansion joint device that can reliably absorb axial and radial deviations between the first pipe flange and the second pipe flange. Background Art

[0002] Conventionally, there is known an expansion joint device for connecting a first pipe flange and a second pipe flange.

[0003] The first pipe flange and the second pipe flange are provided at the end of an existing pipe, or at the end of a pump or a valve, for example. The expansion joint device is used to connect pipes to each other, or to connect a pipe to a pump or a valve.

[0004] Conventionally, to connect existing pipes to each other or to a pipe and a pump or valve, an expansion joint device is installed between a first pipe flange and a second pipe flange provided at the ends of the pipes or between the pipe and the pump or valve.

[0005] However, an expansion joint device that can reliably absorb axial and radial displacements when these displacements occur between the first and second conduit flanges has not yet been developed.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 3-285137

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2005-91215

[0010] Patent Document 3: Japanese Patent Application Laid-Open No. 2004-53317

[0011] Patent Document 4: Japanese Patent Application Laid-Open No. 2004-10355 Summary of the Invention

[0012] Technical problem to be solved by the invention

[0013] The present disclosure is made in consideration of this aspect, and its object is to provide an expansion joint device that can absorb the axial and radial deviations generated between the first pipe flange and the second pipe flange and can reliably connect the first pipe and the second pipe.

[0014] Solutions to Problems

[0015] The expansion joint device disclosed herein is an expansion joint device for connecting a first pipe flange and a second pipe flange, comprising: a first joint pipe having a fixing flange connected to the first pipe flange and a first joint pipe body; a second joint pipe having an eccentric flange connected to the second pipe flange and including an eccentric outer peripheral surface; a second joint pipe body, the second joint pipe being axially slidably mounted to the first joint pipe; and a disc-shaped centering flange slidably mounted to the eccentric outer peripheral surface of the eccentric flange in a circumferential direction, the centering flange having an abutting inner peripheral surface abutting the eccentric outer peripheral surface and being connected to the second pipe flange, a plurality of bolt holes being formed in the centering flange eccentrically relative to the abutting inner peripheral surface, and the centering flange being slidably mounted on the eccentric outer peripheral surface of the eccentric flange in a circumferential direction, thereby separating and contacting the centers of the plurality of bolt holes in the centering flange from the center of the second joint pipe body of the second joint pipe.

[0016] In the expansion joint device disclosed herein, when the eccentric direction of the multiple bolt holes of the centering flange relative to the abutting inner peripheral surface and the eccentric direction of the eccentric outer peripheral surface of the eccentric flange relative to the second joint piping body are directed in opposite directions, the centers of the multiple bolt holes of the centering flange are consistent with the center of the second joint piping body of the second joint piping.

[0017] In the expansion joint device disclosed herein, when the eccentric direction of the multiple bolt holes of the centering flange relative to the abutting inner peripheral surface and the eccentric direction of the eccentric outer peripheral surface of the eccentric flange relative to the second joint piping body are oriented in the same direction, the centers of the multiple bolt holes of the centering flange are farthest from the center of the second joint piping body of the second joint piping.

[0018] In the expansion joint device of the present disclosure, the first joint pipe body is slidably mounted on the outer surface of the second joint pipe body in the axial direction, and a gasket is interposed between the first joint pipe body and the second joint pipe body.

[0019] In the expansion joint device of the present disclosure, the first joint piping body or the second joint piping body is provided with a packing holding portion that holds the packing.

[0020] In the expansion joint device disclosed herein, the aligning flange has an eccentric outer peripheral surface that is eccentric relative to the abutting inner peripheral surface, and the centers of the plurality of bolt holes of the aligning flange coincide with the center of the eccentric outer peripheral surface of the aligning flange.

[0021] In the expansion joint device of the present disclosure, the centering flange has a retaining portion, which is provided adjacent to the abutting inner peripheral surface and retains the eccentric flange between the second pipe flange.

[0022] In the expansion joint device disclosed in the present invention, the first joint piping body has a first joining flange, and the second joint piping body is connected to the first joining flange via a second joining flange joined to the first joining flange, the first joining flange has a plurality of first joining flange bolt holes arranged in a circumferential shape, the second joining flange has a plurality of second joining flange bolt holes arranged corresponding to the first joining flange bolt holes and arranged in a circumferential shape, the joining flange bolts are assembled in the first joining flange bolt holes and the second joining flange bolt holes, and the outer diameter D1 of the joining flange bolts is smaller than the inner diameter D2 of the first joining flange bolt hole and the inner diameter D3 of the second joining flange bolt hole.

[0023] In the expansion joint device of the present disclosure, the relationship among the outer diameter D1 of the joint flange bolt, the inner diameter D2 of the first joint flange bolt hole, and the inner diameter D3 of the second joint flange bolt hole is:

[0024] D2 and D3 are 1.2×D1 or more and 2.0×D1 or less.

[0025] In the expansion joint device of the present disclosure, the inner diameter D2 of the first joint flange bolt hole is the same as the inner diameter D3 of the second joint flange bolt hole.

[0026] The assembly method of the expansion joint device disclosed in the present invention is the assembly method of the expansion joint device described above, which includes: a process of calculating the radial offset between the center of the first pipe flange and the center of the second pipe flange; a process of sliding the centering flange on the eccentric outer peripheral surface of the eccentric flange in the circumferential direction based on the radial offset between the center of the first pipe flange and the center of the second pipe flange to determine the distance between the centers of the multiple bolt holes of the centering flange and the center of the second joint pipe body of the second joint pipe; a process of inserting the expansion joint device into the first pipe flange and the second pipe flange; and a process of connecting the fixing flange to the first pipe flange, and connecting the eccentric flange and the centering flange to the second pipe flange.

[0027] The assembly method of the expansion joint device disclosed in the present invention is the assembly method of the expansion joint device described above, which includes: a process of determining the radial offset between the center of the first pipe flange and the center of the second pipe flange; a process of sliding the centering flange along the eccentric outer peripheral surface of the eccentric flange in the circumferential direction based on the radial offset between the center of the first pipe flange and the center of the second pipe flange, and determining the distance between the centers of the plurality of bolt holes of the centering flange and the center of the second joint pipe body of the second joint pipe; a process of inserting the expansion joint device into the The process of installing the first pipe flange and the second pipe flange; moving the second joining flange in the radial direction relative to the first joining flange, moving the joining flange bolt in the radial direction relative to the first joining flange bolt hole and the second joining flange bolt hole, determining the distance between the center of the first joint piping body and the center of the second joint piping body, and fixing the first joining flange and the second joining flange by the joining flange bolt; and connecting the fixing flange to the first pipe flange, and connecting the eccentric flange and the centering flange to the second pipe flange.

[0028] Effects of the Invention

[0029] As described above, according to the present disclosure, it is possible to reliably absorb the offset in the axial direction and the radial direction that occurs between the first conduit flange and the second conduit flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a cross-sectional view showing one embodiment of an expansion joint device.

[0031] Figure 2 yes Figure 1 Schematic cross-sectional view of .

[0032] Figure 3 It is a side view showing a portion of the expansion joint device in section.

[0033] Figure 4 yes Figure 3 The IV line is directed toward the view.

[0034] Figure 5 It is a cross-sectional view showing an expansion joint device.

[0035] Figure 6 yes Figure 5 Schematic cross-sectional view of .

[0036] Figure 7 It is a front view showing the eccentric flange and the centering flange of the second joint pipe when the adjustment amount in the radial direction is 0.

[0037] Figure 8 It is a front view showing the eccentric flange and the centering flange of the second joint pipe when the adjustment amount in the radial direction is maximum.

[0038] Figure 9 This is a flowchart showing a method for assembling an expansion joint device.

[0039] Figure 10 This is a side view showing another embodiment of the expansion joint device.

[0040] Figure 11 This is a side view showing a state in which the second joining flange moves in the radial direction relative to the first joining flange in another embodiment.

[0041] Figure 12 This is a flowchart illustrating a method for assembling an expansion joint device in another embodiment. DETAILED DESCRIPTION

[0042] <Embodiments of the present invention>

[0043] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0044] Here, Figures 1 to 9 It is a diagram showing an embodiment of the present disclosure.

[0045] in, Figure 1 is a cross-sectional view of the expansion joint device. Figure 2 yes Figure 1 A schematic cross-sectional view of Figure 3 This is a side view with a section cut away. Figure 4 yes Figure 3 The IV line is directed toward the view, Figure 5 is a cross-sectional view of the expansion joint device. Figure 6 yes Figure 5 A schematic cross-sectional view of Figure 7 and Figure 8 is a front view showing the eccentric flange and the centering flange, Figure 9 This is a flowchart showing a method for assembling an expansion joint device.

[0046] like Figures 1 to 4 As shown, the expansion joint device 10 of the present disclosure connects a first pipe flange 1A of a first pipe 1 and a second pipe flange 2A of a second pipe 2 .

[0047] In this embodiment, the first pipe 1 and the second pipe 2 are existing pipes, and generally, there is a high probability of axial and radial displacement relative to reference design values. The expansion joint device 10 of this embodiment is a device that absorbs this axial and radial displacement between the first pipe flange 1A of the first pipe 1 and the second pipe flange 2A of the second pipe 2, while securely connecting the first pipe flange 1A and the second pipe flange 2A.

[0048] It should be noted that the first pipe flange 1A and the second pipe flange 2A are both attached to the ends of the first pipe 1 and the second pipe 2. However, the first pipe flange 1A and the second pipe flange 2A are not necessarily attached to the ends of the first pipe 1 and the second pipe 2. For example, the first pipe flange 1A attached to the first pipe 1 can be connected to the second pipe flange 2A provided on the pump via the expansion joint device 10. Alternatively, the first pipe flange 1A attached to the first pipe 1 can be connected to the second pipe flange 2A provided on the valve via the expansion joint device 10. Furthermore, the first pipe flange 1A provided on the pump can be connected to the second pipe flange 2A provided on the valve via the expansion joint device 10.

[0049] Such an expansion joint device 10 includes: a first joint pipe 11 having a fixed flange 13 connected to a first pipe flange 1A and a first joint pipe body 12; a second joint pipe 21 having an eccentric flange 23 connected to a second pipe flange 2A and a second joint pipe body 22; and a disc-shaped centering flange 30 mounted on the outer periphery of the eccentric flange 23.

[0050] The first joint pipe body 12 of the first joint pipe 11 is cylindrical, and the fixing flange 13 is disc-shaped. The fixing flange 13 is brought into contact with the first pipe flange 1A. The fixing flange 13 and the first pipe flange 1A are connected by inserting a fastening bolt 4 into the bolt hole 13a of the fixing flange 13 and the bolt hole 1a of the first pipe flange 1A, and tightening the fastening bolt 4 with a fastening nut 5.

[0051] The second joint pipe body 22 of the second joint pipe 21 is formed of a cylindrical body, and the eccentric flange 23 has an eccentric outer peripheral surface 25 that is eccentric with respect to the center C1 of the second joint pipe body 22 .

[0052] That is, in Figure 1 、 Figure 5 and Figures 7 and 8 , the center C1 of the second joint pipe body 22 is shown, and the eccentric outer peripheral surface 25 of the eccentric flange 23 has a circular shape slightly eccentric from the center C1 of the second joint pipe body 22 . The center of the eccentric outer peripheral surface 25 is shown by C2 .

[0053] As described above, the centering flange 30 is in the shape of a disk mounted on the outer periphery of the eccentric flange 23. Furthermore, the centering flange 30 includes an abutting inner peripheral surface 31 abutting against the eccentric outer peripheral surface 25 of the eccentric flange 23, and an eccentric outer peripheral surface 32 eccentric to the abutting inner peripheral surface 31.

[0054] The centering flange 30 also includes a retaining portion 33 provided adjacent to the contact inner peripheral surface 31 in the axial direction. The retaining portion 33 sandwiches the eccentric flange 23 of the second joint pipe 21 between the retaining portion 33 and the second pipe flange 2A.

[0055] Next, the centering flange 30 will be described in further detail.

[0056] As described above, the centering flange 30 has the contact inner circumferential surface 31 that contacts the circular eccentric outer circumferential surface 25 of the eccentric flange 23. The contact inner circumferential surface 31 contacts and slides in the circumferential direction with the eccentric outer circumferential surface 25 of the eccentric flange 23, and has the same center C2 as the eccentric outer circumferential surface 25 of the eccentric flange 23 and a circular shape.

[0057] Furthermore, the eccentric outer peripheral surface 32 of the centering flange 30 is eccentric with respect to the contact inner peripheral surface 31 , has a center C3 different from the center C2 of the contact inner peripheral surface 31 , and has a circular shape.

[0058] Furthermore, the centering flange 30 is provided with a plurality of, for example, sixteen, bolt holes 35 for connection to the second pipe flange 2A, as described later. Fastening bolts 6 are inserted into the bolt holes 35 and the bolt holes 2a of the second pipe flange 2A and tightened with fastening nuts 7, thereby connecting the centering flange 30 to the second pipe flange 2A.

[0059] In this embodiment, multiple bolt holes 35 are arranged in a circular pattern along the circumferential direction of the centering flange 30. These multiple bolt holes 35 are coaxially disposed with the eccentric outer peripheral surface 32 of the centering flange 30. Therefore, the multiple bolt holes 35 have the same center C3 as the eccentric outer peripheral surface 32, while the center C3 of the bolt holes 35 is different from the center C2 of the abutting inner peripheral surface 31. Thus, the eccentric outer peripheral surface 32 of the centering flange 30 and the multiple bolt holes 35 are eccentric relative to the abutting inner peripheral surface 31.

[0060] It should be noted that, in this embodiment, the relationship between the center C1 of the second joint pipe body 22 of the second joint pipe 21, the center C2 of the abutting inner peripheral surface 31 of the centering flange 30, and the eccentric outer peripheral surface 32 of the centering flange 30 and the center C3 of the plurality of bolt holes 35 is as follows:

[0061] The distance t1 between C2 and C1 = the distance t2 between C3 and C2.

[0062] However, the first joint pipe body 12 of the first joint pipe 11 is located outside the second joint pipe body 22 of the second joint pipe 21 , and the first joint pipe body 12 is slidable in the axial direction on the outer surface of the second joint pipe body 22 .

[0063] In addition, a gasket 17 extending in the circumferential direction is sandwiched between the end of the first joint piping body 12 and the outer surface of the second joint piping body 22. The gasket 17 is retained by a fixing portion 16 provided at the end on the second pipe flange 2A side of the first joint piping body 12 and a retaining body 18 mounted on the fixing portion 16 using mounting bolts 19.

[0064] The first joint pipe body 12 is movable along the axial direction on the outer surface of the second joint pipe body 22 .

[0065] Therefore, when the distance between the first pipe flange 1A and the second pipe flange 2A increases or decreases compared to the design value, the first joint pipe body 12 of the first joint pipe 11 is moved along the outer surface of the second joint pipe body 22 of the second joint pipe 21 and in the axial direction, so that the first pipe flange 1A and the second pipe flange 2A can be reliably connected through the expansion joint device 10.

[0066] It should be noted that although an example is shown in which the first joint pipe body 12 of the first joint pipe 11 is located on the outside of the second joint pipe body 22 of the second joint pipe 21, and the first joint pipe body 12 can slide along the axial direction on the outer surface of the second joint pipe body 22, it is not limited to this. The first joint pipe body 12 of the first joint pipe 11 can also be arranged on the inner side of the second joint pipe body 22 of the second joint pipe 21, so that the first joint pipe body 12 can slide along the axial direction on the inner surface of the second joint pipe body 22.

[0067] In this case, a gasket 17 extending circumferentially is interposed between the end of the second joint pipe body 22 and the outer surface of the first joint pipe body 12. Furthermore, this gasket 17 is retained by a fixing portion 16 provided at the end of the second joint pipe body 22 on the first pipe flange 1A side and a retaining body 18 mounted to the fixing portion 16 using mounting bolts 19.

[0068] Next, the following uses Figure 9 The flowchart shown here explains the operation of this embodiment having such a configuration.

[0069] First, the amount of radial offset between the center of the first conduit flange 1A and the center of the second conduit flange 2A is determined.

[0070] Next, at the factory or on site, based on the radial offset between the center of the first pipe flange 1A and the center of the second pipe flange 2A, the centering flange 30 is circumferentially slid on the eccentric flange 23 of the second joint pipe 21, and the distance between the center C3 of the plurality of bolt holes 35 and the center C1 of the second joint pipe body 22 of the second joint pipe 21 is determined in a manner consistent with the radial offset between the center of the first pipe flange 1A and the center of the second pipe flange 2A.

[0071] Next, a method of determining the distance between the center C3 of the plurality of bolt holes 35 and the center C1 of the second joint pipe main body 22 of the second joint pipe 21 will be described below.

[0072] First, according to Figure 1 and Figure 2 The following describes a case where the center C3 of the plurality of bolt holes 35 is aligned with the center C1 of the second joint pipe body 22 of the second joint pipe 21 , that is, a case where the radial adjustment amount by the expansion joint device 10 is zero.

[0073] like Figure 1 and Figure 2 As shown, the center C2 of the eccentric outer peripheral surface 25 of the eccentric flange 23 and the contact inner peripheral surface 31 of the centering flange 30 is offset radially upward by a distance t1 relative to the center C1 of the second joint pipe body 22 .

[0074] At this time, Figure 1 The height Hs of the eccentric flange 23 is maximum at the upper portion of the expansion joint device 10 shown, and is minimum at the lower portion of the expansion joint device 10 .

[0075] In addition, if Figure 1 and Figure 2 As shown, the center C3 of the multiple bolt holes 35 and the eccentric outer peripheral surface 32 of the centering flange 30 is offset radially downward by a distance t2 relative to the center C2 of the abutting inner peripheral surface 31 of the centering flange 30 and the eccentric outer peripheral surface 25 of the eccentric flange 23.

[0076] At this time, the length Hf between the contact inner circumferential surface 31 of the centering flange 30 and the eccentric outer circumferential surface 32 is minimum at the upper portion of the expansion joint device 10, and the length Hf between the contact inner circumferential surface 31 of the centering flange 30 and the eccentric outer circumferential surface 32 is maximum at the lower portion of the expansion joint device 10.

[0077] As described above, the distance t1 between C2 and C1 and the distance t2 between C3 and C2 are the same.

[0078] Therefore, the center C2 of the eccentric outer peripheral surface 25 of the eccentric flange 23 and the contact inner peripheral surface 31 of the centering flange 30 is offset radially upward by a distance t1 relative to the center C1 of the second joint pipe body 22, and the center C3 of the multiple bolt holes 35 of the centering flange 30 and the eccentric outer peripheral surface 32 is offset radially downward by a distance t2 relative to the center C2 of the contact inner peripheral surface 31 of the centering flange 30 and the eccentric outer peripheral surface 25 of the eccentric flange 23. As a result, the center C3 of the bolt hole 35 finally coincides with the center C1 of the second joint pipe body 22. That is, the radial adjustment amount of the expansion joint device 10 is 0 (see FIG. 2 ). Figure 1 、 Figure 2 and Figure 7 ).

[0079] Next, according to Figure 5 and Figure 6 The following describes a case where the distance between the center C1 of the second joint pipe body 22 and the center C3 of the plurality of bolt holes 35 relative to the second joint pipe 21 is maximized, that is, a case where the radial adjustment amount by the expansion joint device 10 is maximized.

[0080] like Figure 5 and Figure 6 As shown, the center C2 of the eccentric outer peripheral surface 25 of the eccentric flange 23 and the contact inner peripheral surface 31 of the centering flange 30 is offset radially downward by a distance t1 relative to the center C1 of the second joint pipe body 22 .

[0081] At this time, Figure 5 The height Hs of the eccentric flange 23 is smallest at the upper portion of the expansion joint device 10 shown, and is largest at the lower portion of the expansion joint device 10 .

[0082] In addition, if Figure 1 and Figure 2 As shown, the center C3 of the multiple bolt holes 35 and the eccentric outer peripheral surface 32 of the centering flange 30 is offset radially downward by a distance t2 relative to the center C2 of the abutting inner peripheral surface 31 of the centering flange 30 and the eccentric outer peripheral surface 25 of the eccentric flange 23.

[0083] At this time, the length Hf between the contact inner circumferential surface 31 of the centering flange 30 and the eccentric outer circumferential surface 32 is minimum at the upper portion of the expansion joint device 10, and the length Hf between the contact inner circumferential surface 31 of the centering flange 30 and the eccentric outer circumferential surface 32 is maximum at the lower portion of the expansion joint device 10.

[0084] As described above, the distance t1 between C2 and C1 and the distance t2 between C3 and C2 are the same.

[0085] Therefore, the center C2 of the eccentric outer peripheral surface 25 of the eccentric flange 23 and the contact inner peripheral surface 31 of the centering flange 30 is offset radially downward by a distance t1 relative to the center C1 of the second joint pipe body 22, and the center C3 of the multiple bolt holes 35 and the eccentric outer peripheral surface 32 of the centering flange 30 is also offset radially downward by a distance t2 relative to the center C2 of the contact inner peripheral surface 31 of the centering flange 30 and the eccentric outer peripheral surface 25 of the eccentric flange 23. As a result, the center C3 of the bolt hole 35 is ultimately offset by t1+t2 relative to the center C1 of the second joint pipe body 22. That is, the radial adjustment amount of the expansion joint device 10 is the maximum value t1+t2 (see Figure 5 、 Figure 6 and Figure 8 ).

[0086] In this way, the centering flange 30 slides on the eccentric flange 23 of the second joint pipe 21 in the circumferential direction, and the distance between the center C3 of the plurality of bolt holes 35 and the center C1 of the second joint pipe body 22 of the second joint pipe 21 is determined.

[0087] In this case, the first joint pipe body 12 of the first joint pipe 11 slides in advance on the outer surface of the second joint pipe body 22 of the second joint pipe 21 , and the expansion joint device 10 is in a state of being contracted in the axial direction.

[0088] Next, the expansion joint device 10, contracted along the axial direction, is inserted between the first pipe flange 1A and the second pipe flange 2A. In this case, the offset direction between the center C3 of the plurality of bolt holes 35 and the center C1 of the second joint pipe body 22 of the second joint pipe 21 is aligned with the offset direction between the center of the first pipe flange 1A and the center of the second pipe flange 2A.

[0089] Thereafter, the first joint pipe body 12 of the first joint pipe 11 is slid on the outer surface of the second joint pipe body 22 of the second joint pipe 21 to extend the expansion joint device 10 in the axial direction.

[0090] Thereafter, the first pipe flange 1A and the fixing flange 13 are connected by inserting the fastening bolts 4 into the bolt holes 13 a of the fixing flange 13 and the bolt holes 1 a of the first pipe flange 1A and fastening the fastening bolts 4 with the fastening nuts 5 .

[0091] Similarly, the eccentric flange 23 and the centering flange 30 of the second joint pipe 21 are brought into contact with the second pipe flange 2A, and the fastening bolts 6 are inserted into the bolt holes 35 of the centering flange 30 and the bolt holes 2a of the second pipe flange 2A. The fastening bolts 6 are then tightened using the fastening nuts 7. In this manner, the second pipe flange 2A and the centering flange 30 are connected. In this case, the eccentric flange 23 of the second joint pipe 21 is held between the retaining portion 33 of the centering flange 30 and the second pipe flange 2A.

[0092] As described above, according to this embodiment, the radial offset between the center of the first pipe flange 1A and the center of the second pipe flange 2A is determined in advance. Next, at the factory or on-site, based on the radial offset between the centers of the first pipe flange 1A and the second pipe flange 2A, the centering flange 30 is circumferentially slid on the eccentric flange 23 of the second joint pipe 21. The distance between the center C3 of the plurality of bolt holes 35 and the center C1 of the second joint pipe body 22 of the second joint pipe 21 is aligned with the offset between the centers of the first pipe flange 1A and the second pipe flange 2A. Subsequently, the fixing flange 13 of the first joint pipe 11 is connected to the first pipe flange 1A, and the eccentric flange 23 and the centering flange 30 are connected to the second pipe flange 2A.

[0093] Thus, according to this embodiment, even if an axial deviation occurs between the first pipe flange 1A and the second pipe flange 2A, the axial deviation can be absorbed by the expansion joint device 10 by sliding the first joint pipe body 12 of the first joint pipe 11 along the axial direction on the outer surface of the second joint pipe body 22 of the second joint pipe 21.

[0094] Furthermore, even if radial offset occurs between the first pipe flange 1A and the second pipe flange 2A, the centering flange 30 can be circumferentially slid on the eccentric flange 23 of the second joint pipe 21 to adjust the distance between the center C3 of the plurality of bolt holes 35 and the center C1 of the second joint pipe body 22 of the second joint pipe 21. Thus, the expansion joint device 10 can absorb radial offset.

[0095] <Another embodiment>

[0096] Next, according to Figures 10 to 12 , another embodiment of the present disclosure is described.

[0097] Figures 10 to 12 Another embodiment shown in FIG. 1 is different only in the structure of joining the first joint pipe 11 and the second joint pipe 21, and the other structures are the same as those in FIG. Figures 1 to 9 The embodiments shown are substantially the same. Figures 10 to 12In another embodiment shown, Figures 1 to 9 The same parts in the illustrated embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

[0098] Another embodiment of an expansion joint device 10 includes: a first joint pipe 11 having a fixed flange 13 connected to a first pipe flange 1A and a first joint pipe body 12; a second joint pipe 21 having an eccentric flange 23 connected to a second pipe flange 2A and a second joint pipe body 22; and a disc-shaped centering flange 30 mounted on the outer periphery of the eccentric flange 23.

[0099] The first joint pipe body 12 of the first joint pipe 11 is cylindrical, and the fixing flange 13 is disc-shaped. The fixing flange 13 is brought into contact with the first pipe flange 1A. The fixing flange 13 and the first pipe flange 1A are connected by inserting a fastening bolt 4 into the bolt hole 13a of the fixing flange 13 and the bolt hole 1a of the first pipe flange 1A, and tightening the fastening bolt 4 with the fastening nut 5.

[0100] The second joint pipe body 22 of the second joint pipe 21 is formed of a cylindrical body, and the eccentric flange 23 has an eccentric outer peripheral surface 25 that is eccentric with respect to the center C1 of the second joint pipe body 22 .

[0101] That is, in Figure 1 、 Figure 5 and Figures 7 and 8 , the center C1 of the second joint pipe body 22 is shown, and the eccentric outer peripheral surface 25 of the eccentric flange 23 has a circular shape slightly eccentric from the center C1 of the second joint pipe body 22 . The center of the eccentric outer peripheral surface 25 is shown by C2 .

[0102] As described above, the centering flange 30 is in the shape of a disk mounted on the outer periphery of the eccentric flange 23. Furthermore, the centering flange 30 includes an abutting inner peripheral surface 31 abutting against the eccentric outer peripheral surface 25 of the eccentric flange 23, and an eccentric outer peripheral surface 32 eccentric to the abutting inner peripheral surface 31.

[0103] The centering flange 30 also includes a retaining portion 33 provided adjacent to the contact inner peripheral surface 31 in the axial direction. The retaining portion 33 sandwiches the eccentric flange 23 of the second joint pipe 21 between the retaining portion 33 and the second pipe flange 2A.

[0104] Next, the centering flange 30 will be described in further detail.

[0105] As described above, the centering flange 30 has the contact inner circumferential surface 31 that contacts the circular eccentric outer circumferential surface 25 of the eccentric flange 23. The contact inner circumferential surface 31 contacts and slides in the circumferential direction with the eccentric outer circumferential surface 25 of the eccentric flange 23, and has the same center C2 as the eccentric outer circumferential surface 25 of the eccentric flange 23 and a circular shape.

[0106] Furthermore, the eccentric outer peripheral surface 32 of the centering flange 30 is eccentric with respect to the contact inner peripheral surface 31 , has a center C3 different from the center C2 of the contact inner peripheral surface 31 , and has a circular shape.

[0107] Furthermore, the centering flange 30 is provided with a plurality of, for example, sixteen, bolt holes 35 for connection to the second pipe flange 2A, as described later. The centering flange 30 is connected to the second pipe flange 2A by inserting fastening bolts 6 into the bolt holes 35 and the bolt holes 2a of the second pipe flange 2A and tightening the fastening bolts 6 with fastening nuts 7.

[0108] In this embodiment, multiple bolt holes 35 are arranged in a circular pattern along the circumferential direction of the centering flange 30. These multiple bolt holes 35 are coaxially disposed with the eccentric outer peripheral surface 32 of the centering flange 30. Therefore, the multiple bolt holes 35 have the same center C3 as the eccentric outer peripheral surface 32, while the center C3 of the bolt holes 35 is different from the center C2 of the abutting inner peripheral surface 31. Thus, the eccentric outer peripheral surface 32 of the centering flange 30 and the multiple bolt holes 35 are eccentric relative to the abutting inner peripheral surface 31.

[0109] It should be noted that, in this embodiment, the relationship between the center C1 of the second joint pipe body 22 of the second joint pipe 21, the center C2 of the abutting inner peripheral surface 31 of the centering flange 30, and the eccentric outer peripheral surface 32 of the centering flange 30 and the center C3 of the plurality of bolt holes 35 is as follows:

[0110] The distance t1 between C2 and C1 = the distance t2 between C3 and C2.

[0111] However, the first joint pipe body 12 of the first joint pipe 11 is located outside the second joint pipe body 22 of the second joint pipe 21 , and the first joint pipe body 12 is slidable in the axial direction on the outer surface of the second joint pipe body 22 .

[0112] In addition, if Figure 10 and Figure 11 As shown, the first joint pipe body 12 of the first joint pipe 11 has a first joining flange 40 formed at the end opposite to the fixing flange 13. In addition, the second joint pipe body 22 of the second joint pipe 21 is connected to the first joining flange 40 via a second joining flange 50 joined to the first joining flange 40.

[0113] The first joining flange 40 has a plurality of first joining flange bolt holes 40a arranged in a circumferential pattern, and the second joining flange 50 has a plurality of second joining flange bolt holes 50a arranged in a circumferential pattern corresponding to the first joining flange bolt holes 40a. Joining flange bolts 60 are mounted in the first joining flange bolt holes 40a and the second joining flange bolt holes 50a, and are fastened by fastening nuts 61.

[0114] The fastening nut 61 is prevented from loosening by the lock nut 62 attached to the joint flange bolt 60. The joint flange bolt 60 has a first washer 41 attached to the first joint flange 40 and a second washer 51 attached to the second joint flange 50.

[0115] As described later, the inner diameter D2 of the first joining flange bolt hole 40a and the inner diameter D3 of the second joining flange bolt hole 50a are the same, and the outer diameter D1 of the joining flange bolt 60 is smaller than the inner diameter D2 of the first joining flange bolt hole 40a and the inner diameter D3 of the second joining flange bolt hole 50a.

[0116] In this embodiment, the relationship among the outer diameter D1 of the joint flange bolt 60, the inner diameter D2 of the first joint flange bolt hole 40a, and the inner diameter D3 of the second joint flange bolt hole 50a is:

[0117] D2 and D3 are 1.2×D1 or more and 2.0×D1 or less.

[0118] Here, when D2 and D3 are less than 1.2 × D12, it is difficult to significantly adjust the distance between the center of the first joint pipe body 12 and the center of the second joint pipe body 22, as described later. On the other hand, when D2 and D3 exceed 2.0 × D1, it is difficult to stably secure the first and second joint flanges 40 and 50 using the joint flange bolts 60.

[0119] Therefore, the relationship between the outer diameter D1 of the joint flange bolt 60, the inner diameter D2 of the first joint flange bolt hole 40a, and the inner diameter D3 of the second joint flange bolt hole 50a is that D2 and D3 are 1.2×D1 or more and 2.0×D1 or less.

[0120] Furthermore, the outer shape of the first washer 41 mounted on the joint flange bolt 60 is significantly larger than the inner diameter D2 of the first joint flange bolt hole 40a. For example, the outer diameter of the first washer 41 is equal to the inner diameter of the first joint flange bolt hole 40a times 2. The outer shape of the second washer 51 mounted on the joint flange bolt 60 is significantly larger than the inner diameter D2 of the second joint flange bolt hole 5a. For example, the outer diameter of the second washer 51 is equal to the inner diameter of the second joint flange bolt hole 50a times 2.

[0121] Furthermore, a joint flange fixing portion 56 is provided on the radially inner side of the second joint flange 50, and a joint flange gasket 47 is provided between the outer surface of the second joint pipe body 22 of the second joint pipe 21 and the joint flange fixing portion 56. The joint flange gasket 47 is retained by the joint flange fixing portion 56 and the joint flange retaining portion 48 attached to the second joint flange 50.

[0122] In this embodiment, the joint flange holding portion 48 is mounted on the second joint flange 50 by means of mounting bolts 64 , which are fastened by means of fastening nuts 64 a . Furthermore, lock nuts 65 and 66 are mounted on the mounting bolts 64 .

[0123] Furthermore, the first joint pipe body 12 is movable along the axial direction on the outer surface of the second joint pipe body 22 .

[0124] Therefore, when the distance between the first pipe flange 1A and the second pipe flange 2A increases or decreases compared to the design value, the first joint pipe body 12 of the first joint pipe 11 is moved along the outer surface of the second joint pipe body 22 of the second joint pipe 21 and in the axial direction, so that the first pipe flange 1A and the second pipe flange 2A can be reliably connected through the expansion joint device 10.

[0125] Next, use Figure 12 The flowchart shown here explains the operation of this embodiment having such a configuration.

[0126] First, the amount of radial offset between the center of the first conduit flange 1A and the center of the second conduit flange 2A is determined.

[0127] Next, at the factory or on site, the centering flange 30 is circumferentially slid on the eccentric flange 23 of the second joint pipe 21 based on the radial offset between the center of the first pipe flange 1A and the center of the second pipe flange 2A, and the distance between the center C3 of the plurality of bolt holes 35 and the center C1 of the second joint pipe body 22 of the second joint pipe 21 is determined based on the radial offset between the center of the first pipe flange 1A and the center of the second pipe flange 2A.

[0128] In this case, the first joint pipe body 12 of the first joint pipe 11 slides in advance on the outer surface of the second joint pipe body 22 of the second joint pipe 21 , and the expansion joint device 10 is in a state of being contracted in the axial direction.

[0129] Next, the expansion joint device 10, contracted along the axial direction, is inserted between the first pipe flange 1A and the second pipe flange 2A. In this case, the offset direction between the center C3 of the plurality of bolt holes 35 and the center C1 of the second joint pipe body 22 of the second joint pipe 21 is aligned with the offset direction between the center of the first pipe flange 1A and the center of the second pipe flange 2A.

[0130] Thereafter, the first joint pipe body 12 of the first joint pipe 11 is slid on the outer surface of the second joint pipe body 22 of the second joint pipe 21 to extend the expansion joint device 10 in the axial direction.

[0131] In the present embodiment, the first joint flange 40 and the second joint flange 50 are fixed to each other by fastening the fastening nut 61 to the joint flange bolt 60 . However, at this stage, the fastening nut 61 is not yet fastened to the joint flange bolt 60 .

[0132] In this embodiment, the radial offset between the center of the first pipe flange 1A and the center of the second pipe flange 2A may exceed the maximum adjustment amount that can be adjusted by the centering flange 30 and the eccentric flange 23 (see Figure 10 In this case, the second joint flange 50 is moved in the radial direction relative to the first joint flange 40. At this time, the joint flange bolt 60 moves in the radial direction in the first joint flange bolt hole 40a and the second joint flange bolt hole 50a, so that the distance between the center C4 of the first joint pipe body 12 and the center C1 of the second joint pipe body 22 can be adjusted (refer to Figure 1 and Figure 11 ).

[0133] In this manner, the centering flange 30 slides circumferentially on the eccentric flange 23 of the second joint pipe 21 to adjust the distance between the center C3 of the plurality of bolt holes 35 and the center C1 of the second joint pipe body 22 of the second joint pipe 21. Furthermore, the second joining flange 50 is radially moved relative to the first joining flange 40 to adjust the distance between the center C4 of the first joint pipe body 12 and the center C1 of the second joint pipe body 22. In this manner, the expansion joint device 10 can reliably absorb radial offset between the centers of the first pipe flange 1A and the second pipe flange 2A.

[0134] In this embodiment, the expansion joint device 10 is Figure 10In the illustrated state, the flange bolt 60 is located at the center of the first flange bolt hole 40a and the second flange bolt hole 50a. Furthermore, a gap 45 is formed around the flange bolt 60 within the first flange bolt hole 40a, and a gap 55 is formed around the flange bolt 60 within the second flange bolt hole 50a.

[0135] On the other hand, in the expansion joint device 10, Figure 11 In the illustrated embodiment, the second joining flange 50 moves downward relative to the first joining flange 40, and a gap 45 is formed above the joining flange bolt 60 within the first joining flange bolt hole 40a, with the lower surface of the joining flange bolt 60 abutting the wall surface of the first joining flange bolt hole 40a. Furthermore, a gap 55 is formed below the joining flange bolt 60 within the second joining flange bolt hole 50a, with the upper surface of the joining flange bolt 60 abutting the wall surface of the second joining flange bolt hole 50a. The fastening nut 61 is then tightened against the joining flange bolt 60, thereby joining and securing the first joining flange 40 to the second joining flange 50.

[0136] Thereafter, the first pipe flange 1A and the fixing flange 13 are connected by inserting the fastening bolts 4 into the bolt holes 13 a of the fixing flange 13 and the bolt holes 1 a of the first pipe flange 1A and fastening the fastening bolts 4 with the fastening nuts 5 .

[0137] Similarly, the eccentric flange 23 and the centering flange 30 of the second joint pipe 21 are brought into contact with the second pipe flange 2A, and the fastening bolts 6 are inserted into the bolt holes 35 of the centering flange 30 and the bolt holes 2a of the second pipe flange 2A. The fastening bolts 6 are then tightened using the fastening nuts 7. In this manner, the second pipe flange 2A and the centering flange 30 are connected. In this case, the eccentric flange 23 of the second joint pipe 21 is held between the retaining portion 33 of the centering flange 30 and the second pipe flange 2A.

[0138] Description of Reference Numerals

[0139] 1. First piping

[0140] 1A First pipe flange

[0141] 2 Second piping

[0142] 2A Second pipe flange

[0143] 4 Tightening bolts

[0144] 5 Fastening nut

[0145] 6 Fastening bolts

[0146] 7 Fastening nut

[0147] 10 Expansion joint device

[0148] 11 First joint piping

[0149] 12 First joint pipe body

[0150] 13 Fixing flange

[0151] 16 Fixed part

[0152] 17 Pad

[0153] 18 Maintaining the body

[0154] 19 Mounting bolts

[0155] 21 Second joint piping

[0156] 22 Second joint pipe body

[0157] 23 Eccentric flange

[0158] 25 Eccentric outer surface

[0159] 30 Self-aligning flange

[0160] 31 contact inner surface

[0161] 32 Eccentric outer surface

[0162] 35 bolt holes

[0163] 40 First joining flange

[0164] 40a First joint flange bolt hole

[0165] 41 First washer

[0166] 45 gap

[0167] 47 Joint flange gasket

[0168] 48 Joint flange retaining portion

[0169] 50 Second joining flange

[0170] 50a Second joint flange bolt hole

[0171] 51 Second washer

[0172] 55 Gap

[0173] 60 Joint flange bolts

[0174] C1 Center

[0175] C2 Center

[0176] C3 Center

[0177] C4 Center

Claims

1. An expansion joint device, connecting a first pipe flange to a second pipe flange, wherein: The expansion joint device comprises: a first joint pipe having a fixing flange connected to the first pipe flange and a first joint pipe body; a second joint pipe having an eccentric flange connected to the second pipe flange and including an eccentric outer peripheral surface; and a second joint pipe body, the second joint pipe being slidably mounted on the first joint pipe in an axial direction; and The disc-shaped centering flange is slidably mounted on the eccentric outer peripheral surface of the eccentric flange along the circumferential direction. The centering flange has an inner peripheral surface that abuts against the eccentric outer peripheral surface and is connected to the second pipe flange. A plurality of bolt holes are formed eccentrically on the centering flange relative to the abutting inner circumferential surface, and the centering flange slides along the circumferential direction on the eccentric outer circumferential surface of the eccentric flange, thereby separating the centers of the plurality of bolt holes of the centering flange from contact with the center of the second joint pipe body of the second joint pipe.

2. The expansion joint device according to claim 1, wherein: When the eccentric direction of the multiple bolt holes of the centering flange relative to the abutting inner peripheral surface and the eccentric direction of the eccentric outer peripheral surface of the eccentric flange relative to the second joint piping body are directed in opposite directions, the centers of the multiple bolt holes of the centering flange are consistent with the center of the second joint piping body of the second joint piping.

3. The expansion joint device according to claim 1 or 2, wherein: When the eccentric direction of the multiple bolt holes of the centering flange relative to the abutting inner peripheral surface and the eccentric direction of the eccentric outer peripheral surface of the eccentric flange relative to the second joint piping body are directed in the same direction, the centers of the multiple bolt holes of the centering flange are farthest from the center of the second joint piping body of the second joint piping.

4. The expansion joint device according to claim 1, wherein: The first joint pipe body is attached to the outer surface of the second joint pipe body so as to be slidable in the axial direction, and a gasket is interposed between the first joint pipe body and the second joint pipe body.

5. The expansion joint device according to claim 4, wherein: The first joint pipe body or the second joint pipe body is provided with a packing holding portion that holds the packing.

6. The expansion joint device according to claim 1, wherein: The centering flange has an eccentric outer peripheral surface that is eccentric with respect to the abutting inner peripheral surface, and the centers of the plurality of bolt holes of the centering flange coincide with the center of the eccentric outer peripheral surface of the centering flange.

7. The expansion joint device according to claim 1, wherein: The centering flange includes a retaining portion, which is provided adjacent to the abutting inner peripheral surface and retains the eccentric flange between the retaining portion and the second pipe flange.

8. The expansion joint device according to claim 1, wherein: The first joint pipe body has a first joint flange, The second joint pipe body is connected to the first joint flange via a second joint flange joined to the first joint flange. The first joint flange has a plurality of first joint flange bolt holes arranged in a circumferential shape, and the second joint flange has a plurality of second joint flange bolt holes arranged in a circumferential shape corresponding to the first joint flange bolt holes. Joint flange bolts are fitted into the first joint flange bolt holes and the second joint flange bolt holes, An outer diameter D1 of the joint flange bolt is smaller than an inner diameter D2 of the first joint flange bolt hole and an inner diameter D3 of the second joint flange bolt hole.

9. The expansion joint device according to claim 8, wherein: The relationship among the outer diameter D1 of the joint flange bolt, the inner diameter D2 of the first joint flange bolt hole, and the inner diameter D3 of the second joint flange bolt hole is: D2 and D3 are 1.2×D1 or more and 2.0×D1 or less.

10. The expansion joint device according to claim 9, wherein: An inner diameter D2 of the first joint flange bolt hole is the same as an inner diameter D3 of the second joint flange bolt hole.

11. A method for assembling an expansion joint device, the method for assembling an expansion joint device according to claim 1, wherein: include: a step of determining a radial offset between a center of the first pipe flange and a center of the second pipe flange; The step of sliding the centering flange along the eccentric outer peripheral surface of the eccentric flange in the circumferential direction to determine the distance between the centers of the plurality of bolt holes of the centering flange and the center of the second joint pipe body of the second joint pipe based on the radial offset between the centers of the first pipe flange and the second pipe flange; inserting the expansion joint device into the first pipe flange and the second pipe flange; and The fixing flange is connected to the first pipeline flange, and the eccentric flange and the centering flange are connected to the second pipeline flange.

12. A method for assembling an expansion joint device, the method for assembling an expansion joint device according to claim 8, wherein: include: a step of determining a radial offset between a center of the first pipe flange and a center of the second pipe flange; The step of sliding the centering flange along the eccentric outer peripheral surface of the eccentric flange in the circumferential direction to determine the distance between the centers of the plurality of bolt holes of the centering flange and the center of the second joint pipe body of the second joint pipe based on the radial offset between the centers of the first pipe flange and the second pipe flange; inserting the expansion joint device into the first pipe flange and the second pipe flange; The process of moving the second joining flange in a radial direction relative to the first joining flange, moving the joining flange bolt in a radial direction relative to the first joining flange bolt hole and the second joining flange bolt hole, determining the distance between the center of the first joint pipe body and the center of the second joint pipe body, and fixing the first joining flange and the second joining flange by the joining flange bolt; and The fixing flange is connected to the first pipeline flange, and the eccentric flange and the centering flange are connected to the second pipeline flange.

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