Pipe joint, spacer provided in the pipe joint, and divided pieces constituting the spacer

Abstract

To provide a pipe joint which can facilitate the centering work of a spacer when attaching the spacer.SOLUTION: A spacer 40 for limiting the relative movement of a spigot 12 and a receptacle 15 in a pipe axial direction C is attached between a tip part 12a of the spigot 12 and a depth end face 19 of the receptacle 15, and the spacer 40 has a cylindrical spacer main body 41 which is sandwiched between the tip part 12a of the spigot 12 and the depth end face 19 of the receptacle 15, a centering abutment face 45 abutting on an internal peripheral face 20 of the receptacle 15, and a separation face 47 separating from the depth end face 19 of the receptacle 15 in a separation direction A of the spigot 12. A clearance 48 surrounded by the separation face 47 of the spacer 40, and the depth end face 19 and the internal peripheral face 20 of the receptacle 15 is formed, the clearance 48 is formed outside a contact part 50 in a radial direction B in which an end part 41a of the spacer main body 41 contacts the depth end face 19 of the receptacle 15, and the separation face 47 is formed over a clearance between the contact part 50 and the centering abutment face 45 in the radial direction B.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a pipe joint having a separation prevention function, a spacer provided in the pipe joint, and a divided piece constituting the spacer. [Background technology]

[0002] Conventionally, an example of this type of pipe fitting is, as shown in Figure 24, an insertion port 202 of one pipe 201 is inserted into a receiving port 204 of the other pipe 203, a lock ring 206 is accommodated in a groove 205 formed on the inner surface of the receiving port 204, and a protrusion 207 that can engage with the lock ring 206 from the back side of the receiving port 204 is formed on the outer surface of the insertion port 202.

[0003] A sealing rubber ring 208 is provided between the outer peripheral surface of insertion port 202 and the inner peripheral surface of receiving port 204, and a push ring 209 that presses rubber ring 208 between the outer peripheral surface of insertion port 202 and the inner peripheral surface of receiving port 204 is fastened to the opening end face of receiving port 204 by a bolt and nut 210.

[0004] Moreover, such a pipe fitting 200 is provided with a spacer 212 for limiting relative movement between the insertion port 202 and the socket 204 in the pipe axis direction C. The spacer 212 is a cylindrical member, and is attached by being sandwiched between the tip end of the insertion port 202 and the inner end face 213 of the socket 204.

[0005] According to this, by providing the spacer 212, the relative movement between the insertion port 202 and the receiving port 204 in the pipe axis direction C is restricted, so that the pipe fitting 200 is restrained from moving in parts where uneven forces are applied to the pipe line (such as bent pipe sections or intersections of the pipe line), and the expansion and contraction function between the insertion port 202 and the receiving port 204 and the bending function between the insertion port 202 and the receiving port 204 are restricted.

[0006] This makes it possible to prevent the pipe from expanding, contracting or bending in the direction in which the uneven force acts, which would adversely affect the sealing performance of the pipe joint 200.

[0007] Incidentally, a pipe joint 200 equipped with the above-mentioned spacer 212 is described in, for example, Patent Document 1 listed below. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent Publication No. 2004-162854 Summary of the Invention [Problem to be solved by the invention]

[0009] However, in the above-mentioned conventional type, outer peripheral surface 212a of spacer 212 is spaced from inner peripheral surface 204a of socket 204, and gap 214 is formed over the entire circumference between outer peripheral surface 212a of spacer 212 and inner peripheral surface 204a of socket 204. For this reason, when spacer 212 is attached inside socket 204, the position of spacer 212 is likely to shift in radial direction B, and there is a problem that the centering work of aligning the center of spacer 212 with the center of socket 204 is time-consuming.

[0010] An object of the present invention is to provide a pipe joint, a spacer provided in the pipe joint, and divided pieces constituting the spacer, which can facilitate centering of the spacer when the spacer is attached. [Means for solving the problem]

[0011] In order to achieve the above object, the first invention provides a device for inserting a plug into a socket, A lock ring is received in a groove formed on the inner peripheral surface of the socket, A pipe fitting having an engagement portion formed on an outer circumferential surface of an insertion port that can engage with a lock ring from the back side of the insertion port, A spacer is attached between the tip of the insertion port and the back end surface of the receiving port to limit relative movement between the insertion port and the receiving port in the pipe axial direction; The spacer is a cylindrical spacer body that is sandwiched between a tip end of the insertion port and a rear end surface of the receiving port; a protrusion protruding radially outward from an outer periphery of the spacer body; It is formed on the outer periphery of the protrusion, a centering abutment surface that abuts against an inner peripheral surface of the socket; It is formed on the protrusion and a separation surface that is separated from the rear end surface of the receiving port in a removal direction of the insertion port, A gap is formed between the spacer's separation surface and the inner peripheral surface of the socket, the gap is located radially outward of a contact portion where an end portion of the spacer body in the pipe axis direction contacts a deep end surface of the socket, The spacing surface is formed between the contact portion and the centering abutment surface in the radial direction. At the same time, the insertion port is inclined in the direction of removal from the contact portion toward the centering abutment surface, The contact portion is formed at the boundary between the end face of the spacer body facing the inner end face of the socket and the separation surface. There is something.

[0012] As a result, the centering abutment surface of the spacer abuts against the inner surface of the receiving port, so that the mounting position of the spacer does not shift radially and the center of the spacer coincides with the center of the receiving port, making it easy to center the spacer relative to the receiving port when installing the spacer.

[0013] In addition, even if a force in the insertion direction (hereinafter referred to as the insertion force) acts on the insertion port and a reaction force of the insertion force acts on the spacer body from the rear end face of the receiving port, a gap is formed between the spacer's separation surface and the rear end face of the receiving port, and the spacer's separation surface is separated from the rear end face of the receiving port without contacting it, so that the reaction force of the insertion force hardly acts on the spacer's separation surface from the rear end face of the receiving port. This makes it possible to reduce deformation of the part of the spacer where the separation surface is formed.

[0015] Also Even if an insertion force acts on the insertion port and a reaction force of the insertion force acts on the spacer body from the rear end face of the receiving port, a gap is formed between the spacer's separation surface and the rear end face of the receiving port, and the spacer's separation surface is separated from the rear end face of the receiving port without contacting it, so that the reaction force of the insertion force hardly acts on the spacer's separation surface from the rear end face of the receiving port. This makes it possible to reduce deformation of the spacer's protrusions.

[0016] This 2In the pipe joint of the present invention, the protrusions are formed at a plurality of positions on the spacer body in the pipe axial direction, The separation surface is formed on the protrusion at the innermost end of the socket, A centering abutment surface is formed on the outer periphery of each projection; A recessed portion recessed radially inward is formed between the protrusions facing each other in the tube axial direction.

[0017] With this, the centering abutment surfaces of the multiple protrusions of the spacer each abut against the inner surface of the receiving port, thereby stabilizing the posture of the spacer when it is installed, thereby improving the workability of centering the spacer.

[0018] Furthermore, since the recesses are formed between the protrusions, the spacer can be made lighter in weight.

[0019] This 3 In the pipe joint of the invention, the contact portion is located in a region between the outer peripheral surface and the inner peripheral surface of the spacer body in the radial direction.

[0020] According to this, when an insertion force is applied to the insertion port, the radial distance between the point where the insertion force acts on the spacer body and the point where the reaction force acts on the spacer body (i.e., the point of the contact part) is shortened. Therefore, the bending moment acting on the spacer is reduced, and most of the force acting on the spacer becomes a compressive force in the tube axis direction, which makes it easy to maintain the strength of the spacer.

[0021] This 4 The present invention is the above first to third inventions. 3 A spacer provided in the pipe joint according to any one of the inventions, Divided into a plurality of arc-shaped segments in the circumferential direction, The ends of adjacent segments in the circumferential direction are connected to each other.

[0022] According to this, by connecting the multiple divided pieces together inside the socket, a cylindrical spacer can be assembled.

[0023] This 5 The present invention relates to the above-mentioned 4 A divided piece constituting the spacer according to the present invention, It has connections at both ends.

[0024] According to this, by connecting the connection portion of one segment adjacent to the other segment in the circumferential direction with the connecting device, both segments can be connected to each other. Effect of the Invention

[0025] As described above, according to the present invention, the centering abutment surface of the spacer abuts against the inner surface of the receiving port, so that the center of the spacer coincides with the center of the receiving port, making it easy to center the spacer when installing the spacer. [Brief description of the drawings]

[0026] [Figure 1] FIG. 2 is a diagram of a pipeline having a pipe joint according to an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] 13 is a view showing the state in which the lock ring provided in the pipe joint is expanded in diameter. FIG. [Figure 4] FIG. [Diagram 5] FIG. 4 is a front view of a spacer provided in the pipe joint according to the first embodiment. [Figure 6] FIG. 4 is a front view of a split piece constituting a spacer provided in the pipe joint according to the first embodiment. [Figure 7] 7 is a view taken along the arrow XX in FIG. 6. [Figure 8] 7 is a view taken along the arrow YY in FIG. 6. [Figure 9] 7 is a view taken along the arrow ZZ in FIG. 6. [Figure 10] FIG. 4 is a cross-sectional view showing a connection structure between divided pieces of the spacer according to the first embodiment. [Figure 11] 13 is a diagram of a connecting plate for connecting the divided pieces of the spacer according to the first embodiment. FIG. [Figure 12] 11A to 11C are diagrams showing a procedure for assembling the spacer according to the first embodiment. [Figure 13] 11A to 11C are diagrams showing a procedure for assembling the spacer according to the first embodiment. [Figure 14] FIG. 13 is a diagram showing the procedure for assembling the spacer according to the first embodiment, in which the periphery of the centering bolt provided on the lower semicircular body is shown enlarged. [Figure 15] 13 is a view of a bolt fixing jig used when assembling the spacer according to the first embodiment. FIG. [Figure 16] 11A to 11C are diagrams showing a procedure for assembling the spacer according to the first embodiment. [Figure 17] 13 is a diagram showing the procedure for assembling the spacer according to the first embodiment, with an enlarged view of the periphery of the centering bolt. FIG. [Figure 18] 11A to 11C are diagrams showing a procedure for assembling the spacer according to the first embodiment. [Figure 19] 11A to 11C are diagrams showing a procedure for assembling the spacer according to the first embodiment. [Figure 20] 13 is a diagram showing the procedure for assembling the spacer according to the first embodiment, with an enlarged view of the periphery of the centering bolt. FIG. [Figure 21] 11A to 11C are diagrams showing a procedure for assembling the spacer according to the first embodiment. [Figure 22] 4 is a cross-sectional view showing a method for joining pipes of the pipe joint of the first embodiment. FIG. [Diagram 23] 4 is a cross-sectional view showing a force acting on a spacer provided in the pipe joint of the first embodiment. FIG. [Figure 24] FIG. 1 is a cross-sectional view of a conventional pipe joint. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0028] (First embodiment) As shown in FIG. 1, reference numeral 1 denotes a pipeline formed by joining a plurality of pipes, and this pipeline 1 has a bent portion 2 in which an uneven force 3 acts.

[0029] In this type of pipeline 1, reference numeral 10 denotes a pipe joint with a separation prevention function, in which a spigot 12 formed at one end of one pipe 11 is inserted into a socket 15 formed at the other end of the other pipe 14. These pipes 11, 14 are made of, for example, ductile iron pipes.

[0030] 2 is a cross-sectional view of the pipe fitting 10, in which a plug protrusion 17 (an example of an engagement portion) is formed around the entire outer periphery of the plug 12. The plug protrusion 17 is formed at a position that is retreated a predetermined length from the tip surface 12a of the plug 12 in the removal direction A of the plug 12.

[0031] The socket 15 has an annular inner end surface 19 at its inner end. The inner end surface 19 is formed over the entire circumference from the inner end of the inner peripheral surface 20 of the socket 15 toward the inside in the radial direction B, and faces the tip surface 12a of the insertion socket 12 in the tube axis direction C.

[0032] A lock ring accommodating groove 21 (an example of a groove) is formed around the entire circumference of the inner circumferential surface 20 of the socket 15. The lock ring accommodating groove 21 accommodates a lock ring 22 and an annular pressing member 23 that presses the lock ring 22 inward in the radial direction B.

[0033] As shown in FIG. 3, the lock ring 22 is a ring with a one-piece structure cut in one place, and has an elasticity such that the diameter can be expanded by expanding the width 26 of the cut portion 25 with an expander 27, and the diameter can be reduced and returned to the original diameter by removing the expander 27 from the cut portion 25.

[0034] As shown in FIG. 2, the insertion port protrusion 17 engages with the lock ring 22 from the rear side of the socket 15 in the removal direction A of the insertion port 12, thereby preventing the insertion port 12 from being removed from the socket 15.

[0035] A seal ring 30 is provided on the side of the lock ring 22 that is closer to the open end face 29 of the socket 15 and is compressed in the radial direction B to form a seal between the outer circumferential surface of the insertion port 12 and the inner circumferential surface of the socket 15. The seal ring 30 is a rubber ring (rubber ring), and is inserted between the outer circumferential surface of the insertion port 12 and the inner circumferential surface of the socket 15.

[0036] A pressure ring 31 is provided on the open end surface 29 of the socket 15 to press the seal ring 30 toward the back side of the socket 15. The pressure ring 31 has an abutment portion 32 that abuts against the open end surface 29 of the socket 15, and is connected to the open end surface 29 of the socket 15 by a plurality of T-head bolts 33 and nuts 34.

[0037] A backup ring 36 is provided between the lock ring 22 and the seal ring 30 in the tube axis direction C to prevent the seal ring 30 from being pressed by the press ring 31 and entering the lock ring receiving groove 21. The backup ring 36 is disposed adjacent to the lock ring 22, is a ring with a one-split structure cut at one location, and is made of an elastic material such as resin.

[0038] A spacer 40 for restricting the relative movement between the insertion port 12 and the socket 15 in the tube axis direction C is attached between the tip surface 12a of the insertion port 12 and the back end surface 19 of the socket 15. As shown in Figs. 2, 4, and 5, the spacer 40 has a cylindrical spacer body 41 sandwiched between the tip surface 12a of the insertion port 12 and the back end surface 19 of the socket 15, and first and second protrusions 42, 43 protruding outward in the radial direction B from the outer peripheral surface 41b of the spacer body 41. The first and second protrusions 42, 43 are formed over the entire circumference at both ends (two locations) of the spacer body 41 in the tube axis direction C. Of these, the first protrusion 42 is formed at one end of the spacer body 41, which is the end closer to the back end surface 19 of the socket 15, and the second protrusion 43 is formed at the other end of the spacer body 41, which is the end closer to the tip surface 12a of the insertion port 12.

[0039] 4 and 9, the first protrusion 42 and the second protrusion 43 have the same cross-sectional shape, and the cross sections of the first and second protrusions 42, 43 are each formed into a trapezoidal shape with a width W in the tube axis direction C decreasing toward the outside in the radial direction B. A centering abutment surface 45 that abuts against the inner peripheral surface 20 of the socket 15 is formed around the entire outer periphery of each of the first and second protrusions 42, 43.

[0040] First protrusion 42 (an example of a protrusion located at the innermost end side of socket 15) has a separation surface 47 formed around its entire periphery, which is separated from rear end face 19 of socket 15 in removal direction A of insertion port 12. As shown in Figures 2 and 4, inside socket 15, a gap 48 surrounded by separation surface 47, rear end face 19 of socket 15, and inner circumferential surface 20 of socket 15 is formed around its entire periphery. The gap 48 is located outside in the radial direction B of a contact portion 50 at which one end of the spacer body 41 in the pipe axis direction C contacts the inner end face 19 of the socket 15. As shown in Figure 4, the form of the contact portion 50 is a point contact in a cross section taken along the radial direction B of the pipe fitting 10, but is a circular line contact in the circumferential direction D of the pipe fitting 10.

[0041] As shown in Figures 4, 8, and 9, the separation surface 47 is formed in the radial direction B between the contact portion 50 and the centering abutment surface 45 of the first protrusion portion 42, and is inclined in the removal direction A of the insertion port 12 as it moves from the contact portion 50 toward the centering abutment surface 45 of the first protrusion portion 42.

[0042] The contact portion 50 is formed around the entire circumference at the boundary between one end face 41a of the spacer body 41 facing the rear end face 19 of the receiving port 15 and the separation surface 47, and is located within the area between the outer peripheral surface 41b and the inner peripheral surface 41c of the spacer body 41 in the radial direction B.

[0043] Between the two protruding portions 42, 43 facing each other in the tube axial direction C, a recessed portion 51 recessed inward in the radial direction B is formed over the entire periphery.

[0044] 5 to 9, the spacer 40 is divided into a plurality of (for example, six in FIG. 5) arc-shaped segments 60a to 60f in the circumferential direction D. That is, each of the segments 60a to 60f has a spacer main body 41 and first and second protrusions 42, 43 that are divided into a plurality of pieces in the circumferential direction D.

[0045] Ends of adjacent split pieces 60a to 60f in the circumferential direction D are connected to each other by a connecting device 61. As shown in Figures 5, 10 and 11, the connecting device 61 has a connecting plate 62, a bolt 63 and a washer 64. Two through holes 65, 66 are formed in the connecting plate 62, and one of the through holes 65 is an elongated hole.

[0046] 6 and 7, screw holes 67 (an example of a connection portion) are formed at both ends of each of the divided pieces 60a to 60f. These screw holes 67 are formed in the inner circumferential surface 41c of the spacer body 41 of each of the divided pieces 60a to 60f.

[0047] As shown in Figure 10, two bolts 63 are inserted through a washer 64 and both through holes 65, 66 of the connecting plate 62, and screwed into a screw hole 67 of one adjacent segment piece 60a-60f and a screw hole 67 of the other segment piece 60a-60f in the circumferential direction D and tightened, thereby connecting one segment piece 60a-60f to the other segment piece 60a-60f.

[0048] 6 to 8, a plurality of centering holes 70 are formed in one end face of each of the divided pieces 60a to 60f in the circumferential direction D. These centering holes 70 open into the end faces of the first and second protrusions 42, 43 of each of the divided pieces 60a to 60f.

[0049] As shown in FIGS. 6, 7 and 9, an insertion hole 71 penetrating the outer circumferential surface 41b and the inner circumferential surface 41c of the spacer body 41 is formed in the center in the circumferential direction D of each of the divided pieces 60a to 60f.

[0050] A method for joining the pipes 11, 14 together in the pipe joint 10 will now be described.

[0051] First, the spacer 40 is set inside the socket 15 as follows.

[0052] As shown in Fig. 12, three divided pieces 60a to 60c occupying the lower half of the inner peripheral surface 20 of the socket 15 are set inside the socket 15. Then, as shown in Fig. 10, a connecting plate 62, a bolt 63, and a washer 64 are used to connect the divided pieces 60a to 60c of the lower half to each other as shown in Fig. 12, thereby forming a lower semicircular body 73 corresponding to the lower half of the spacer 40.

[0053] Centering holes 70 are formed in both end faces 74, 75 of the lower semicircular body 73 in the circumferential direction D, and bolt fixing jigs 77 are set on both end faces 74, 75, as shown in Figs.

[0054] 15, the bolt fixing jig 77 is an elastically deformable rubber plate for aligning the orientation of a plurality of centering bolts 81 (see FIGS. 13 and 14) described below and preventing them from rotating together, and has two through holes 78 that penetrate both the front and back surfaces in the plate thickness direction and a notch 79. The notch 79 is formed so that a part (about ¼) of the inner circumference of the through hole 78 is open to the outer edge of the bolt fixing jig 77.

[0055] Then, as shown in Figures 13 and 14, approximately the lower halves of the four centering bolts 81, two on each side, are inserted into the through holes 78 (see Figure 15) of each bolt fixing jig 77 and the centering holes 70 in both end faces 74, 75 of the lower semicircular body 73, and nuts 82 are screwed onto each centering bolt 81 and abutted against the upper surface of the bolt fixing jig 77.

[0056] At this time, since the inner circumference of the through hole 78 of the bolt fixing jig 77 and the outer circumference of the centering bolt 81 are in contact with each other, it is possible to prevent the orientation of each centering bolt 81 from shifting, and it is possible to easily align the orientation of each centering bolt 81.

[0057] Next, as shown in Figures 16 and 17, approximately the upper half of each centering bolt 81 protruding upward from both end faces 74, 75 of the lower semicircular body 73 is inserted from below into the centering holes 70 of another pair of upper divided pieces 60d, 60e. In this state, as shown in Figure 18, a tension rod 84 is inserted into the insertion hole 71 (see Figures 6 and 7) of one of the upper left and right divided pieces 60d and the insertion hole 71 of the other divided piece 60e to tension them, thereby holding the pair of upper divided pieces 60d, 60e from above the lower semicircular body 73 so that they do not fall off.

[0058] Then, the topmost split piece 60f is set between the pair of upper split pieces 60d, 60e on the left and right sides, and the upper half of the split pieces 60d to 60f are connected to each other using a connecting plate 62, a bolt 63, and a washer 64, thereby forming an upper semicircular body 85 corresponding to the upper half of the spacer 40, as shown by the solid line in Figure 18.

[0059] 19, a vertically long columnar jack device 86 is set in the socket 15. The jack device 86 has a hydraulic cylinder 97 for raising and lowering a support pillar 95, a base plate 96 attached to the lower end of the hydraulic cylinder 97, and a receiving plate 98 attached to the upper end of the support pillar 95.

[0060] The jack device 86 is operated to extend the piston rod 97 a of the hydraulic cylinder 97 , lifting the upper semicircular body 85 with the receiving plate 98 , and the outer periphery of the upper semicircular body 85 is brought into contact with the inner periphery 20 of the receiving port 15 .

[0061] 20, each nut 82 is rotated and raised until it comes into contact with both end faces 88, 89 in the circumferential direction D of the upper semicircular body 85. At this time, the inner periphery of the through hole 78 of the bolt fixing jig 77 and the outer periphery of the centering bolt 81 come into contact with each other to fix the centering bolt 81, so that the centering bolt 81 can be prevented from rotating together with the nut 82.

[0062] Thereafter, as shown in Fig. 21, the tension rod 84 is pulled out of the insertion hole 71 and removed from the divided pieces 60d, 60e of the upper semicircular body 85, and the jack device 86 is removed from inside the socket 15 and removed. Furthermore, as shown by the imaginary lines in Fig. 20 and the imaginary lines in Fig. 21, both bolt fixing jigs 77 are removed from above the end faces 74, 75 of the lower semicircular body 73. At this time, by horizontally moving the bolt fixing jig 77 toward the inside E in the radial direction B, the centering bolt 81 passes from inside the through hole 78 of the bolt fixing jig 77 through the cutout portion 79 (see Fig. 15) and relatively disengages to the outside of the bolt fixing jig 77, so that the bolt fixing jig 77 can be removed.

[0063] As a result, as shown in Figure 5, with the outer periphery of the upper semicircular body 85 abutting against the inner surface 20 of the receiving port 15, the upper semicircular body 85 is supported above the lower semicircular body 73 via the centering bolts 81 and nuts 82, and the spacer 40 is set inside the receiving port 15 in a centered state.

[0064] Also, the backup ring 36, the seal ring 30, and the press ring 31 are fitted onto one of the pipes 11 in advance. Then, the lock ring 22 and the pressing member 23 are accommodated (set) into the lock ring accommodating groove 21 of the other pipe 14. Then, as shown in Fig. 3, the width 26 of the cut portion 25 of the lock ring 22 is expanded with an expander 27 to expand the diameter of the lock ring 22. Next, as shown in Fig. 22, an L-shaped diameter expansion holder 90 is inserted into the cut portion 25 of the lock ring 22, and the expander 27 is removed to maintain the lock ring 22 in the expanded diameter state.

[0065] Thereafter, the insertion port 12 is inserted into the socket 15, and the insertion port protrusion 17 passes from the socket open end side of the lock ring 22 to the socket back side, and the tip surface 12a of the insertion port 12 is abutted against the other end surface 41d of the spacer body 41 of the spacer 40. At this time, since the lock ring 22 is maintained in an expanded state by the diameter expansion holder 90, the insertion port protrusion 17 easily passes inside the lock ring 22.

[0066] Next, the diameter expansion holder 90 is removed to reduce the diameter of the lock ring 22. As a result, the lock ring 22 clings to the outer periphery of the insertion port 12.

[0067] Thereafter, the backup ring 36 is moved in the tube axis direction C and pushed into the inside of the socket 15 until it is adjacent to the lock ring 22 .

[0068] Furthermore, the seal ring 30 is moved in the pipe axis direction C and inserted between the outer circumferential surface of the insertion port 12 and the inner circumferential surface of the socket 15, the pressure ring 31 is connected to the open end of the socket 15 using a T-head bolt 33 and a nut 34, and the T-head bolt 33 and the nut 34 are tightened until the abutment portion 32 of the pressure ring 31 abuts against the open end face 29 of the socket 15. As a result, as shown in Figure 2, the seal ring 30 is pressed between the outer circumferential surface of the insertion port 12 and the inner circumferential surface of the socket 15 and compressed in the radial direction B. This joins the pipes 11, 14 to each other at the pipe joint 10.

[0069] The operation of the pipe joint 10 equipped with such a spacer 40 will be described below.

[0070] 4, the centering abutment surface 45 of the spacer 40 abuts against the inner peripheral surface 20 of the socket 15, so that the mounting position of the spacer 40 does not shift in the radial direction B and the center of the spacer 40 coincides with the center of the socket 15, which makes it easy to center the spacer 40 relative to the socket 15 when attaching the spacer 40. At this time, the centering abutment surfaces 45 of the first and second protrusions 42, 43 each abut against the inner peripheral surface 20 of the socket 15, so that the posture of the spacer 40 is stable when the spacer 40 is attached, improving the workability of centering the spacer 40.

[0071] Furthermore, since the recess 51 is formed between the protrusions 42, 43, the spacer 40 can be made lighter in weight.

[0072] 23, even if a force F1 in the insertion direction (hereinafter referred to as insertion force F1) acts on insertion port 12 and a reaction force F2 of the insertion force F1 acts on spacer body 41 from rear end face 19 of socket 15, a gap 48 is formed between separation surface 47 of spacer 40 and rear end face 19 of socket 15, and separation surface 47 of spacer 40 is separated from rear end face 19 of socket 15 without contacting it, so that reaction force F2 acts on spacer body 41 from contact portion 50 and barely acts on separation surface 47 of spacer 40. This makes it possible to reduce deformation of the portion where separation surface 47 of spacer 40 is formed, i.e., first protrusion 42.

[0073] 8, 9 and 23, since the contact portion 50 is located in the region between the outer peripheral surface 41b and the inner peripheral surface 41c of the spacer body 41 in the radial direction B, the distance L in the radial direction B between the point 52 where the insertion force F1 acts on the other end face 41d of the spacer body 41 and the point where the reaction force F2 acts on the one end face 41a of the spacer body 41 (i.e., the point of the contact portion 50) is shortened. Therefore, the bending moment acting on the spacer 40 is reduced, and most of the force acting on the spacer 40 becomes a compressive force in the tube axis direction C, which makes it easy to maintain the strength of the spacer 40.

[0074] In the above embodiment, as shown in FIG. 1, both the one pipe 11 and the other pipe 14 are straight pipes, and the configuration of the pipe fitting 10 for these two pipes 11, 14 is shown. However, the pipe fitting may be one in which one of the pipes 11, 14 is a curved pipe and the other is a straight pipe, or the pipe fitting may be one in which one of the pipes 11, 14 is a T-shaped pipe and the other is a straight pipe.

[0075] In the above embodiment, as shown in Fig. 2, the spacer 40 has the spacer body 41 and the two protrusions 42, 43, but may have one or more than two protrusions. Also, the spacer 40 has the recess 51 between the protrusions 42, 43, but the recess 51 may be filled in and eliminated.

[0076] In the above embodiment, as shown in FIG. 5, the spacer 40 is divided into six divided pieces 60a to 60f, but the number of pieces is not limited to six, and the spacer 40 may be divided into a number other than six. [Explanation of symbols]

[0077] 10 Pipe fittings 12 Insertion port 12a Tip of the insertion port 15 socket 17 Insertion port protrusion (engagement part) 19 End face of socket 20 Inner surface of socket 21 Lock ring receiving groove (groove) 22 Lock Ring 40 Spacer 41 Spacer body 41a One end face of the spacer body 41b Outer circumferential surface of spacer body 41c Inner circumferential surface of spacer body 42,43 Protrusion 45 Centering contact surface 47 Separation surface 48 Gap 50 Contact part 60a~60f split piece 67 Screw hole (connection part) A Departure direction B Radial direction C Tube axis direction D Circumferential direction

Claims

1. The insert is inserted into the socket, A lock ring is received in a groove formed on the inner peripheral surface of the socket, A pipe fitting having an engagement portion formed on an outer circumferential surface of an insertion port that can engage with a lock ring from the back side of the insertion port, A spacer is attached between the tip of the insertion port and the back end surface of the receiving port to limit relative movement between the insertion port and the receiving port in the pipe axial direction; The spacer is a cylindrical spacer body that is sandwiched between a tip end of the insertion port and a rear end surface of the receiving port; a protrusion protruding radially outward from an outer periphery of the spacer body; a centering abutment surface formed on an outer periphery of the protrusion and abutting against an inner periphery of the socket; a separation surface formed on the protrusion and spaced apart from the rear end surface of the receiving port in the removal direction of the insertion port; A gap is formed between the spacer's separation surface and the inner peripheral surface of the socket, the gap is located radially outward of a contact portion where an end portion of the spacer body in the pipe axis direction contacts a deep end surface of the socket, the separation surface is formed between the contact portion and the centering abutment surface in the radial direction, and is inclined in a direction in which the insertion port is removed as it goes from the contact portion toward the centering abutment surface, A pipe joint characterized in that the contact portion is formed at a boundary portion between the end face of the spacer body facing the inner end face of the receiving port and the separating surface.

2. The protrusions are formed at a plurality of positions on the spacer body in the tube axial direction, The separation surface is formed on the protrusion at the innermost end of the socket, A centering abutment surface is formed on the outer periphery of each projection; 2. The pipe joint according to claim 1, wherein a recessed portion recessed radially inward is formed between the protrusions opposed to each other in the pipe axial direction.

3. 3. The pipe joint according to claim 1, wherein the contact portion is located in a region between an outer peripheral surface and an inner peripheral surface of the spacer body in a radial direction.

4. A spacer provided in the pipe joint according to any one of claims 1 to 3, Divided into a plurality of arc-shaped segments in the circumferential direction, A spacer characterized in that ends of adjacent segments in the circumferential direction are connected to each other.

5. A divided piece constituting the spacer according to claim 4, A divided piece of a spacer, characterized in that it has connecting portions at both ends.

Images