JP2016056871A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of adding a slip-off mechanism to an existing pipe line having a seal mechanism only without disassembling the pipe line.SOLUTION: This invention comprises a seal mechanism 100 for compressing a ring-like packing 20 by an end flange 11 and an additional flange 12 of a joint main body 10 and closely contacting to an outer surface of a connection pipe P2 and a slip-off mechanism 200 for restricting a slip-off of the connection pipe P2. The slip-off mechanism 200 comprises a slip-off ring 51, a presser ring 60 having an acting surface, a presser ring fastening means 70 and a spacer 80. The slip-off ring 51 is divided at one location or a plurality of locations in a peripheral direction. Both presser ring 60 and the spacer 80 are also divided at a plurality of locations in their peripheral directions. The presser ring 60 is divided into an inner ring 62 and an outer ring 63. Their overlapped surfaces are formed by slant surfaces 64, 65 having a smaller gradient than that of an acting surface 61.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint having both a sealing function for preventing water leakage to the outside of a pipe line and a retaining function for preventing a connection pipe from coming out, and more particularly to an existing pipe line having only a sealing function. It is related with the pipe joint which can add a retaining function newly without dismantling.

  FIG. 16 is a half-mounted longitudinal side view of the pipe joint A described in the prior document (for example, Patent Document 1). As shown in the figure, the pipe joint A proposed by Patent Document 1 has only a sealing function exhibited by the sealing mechanisms 100 and 100 provided symmetrically on both sides of the tubular joint body 10. . The joint body 10 is connected to the upstream connection pipe P1 via the seal mechanism 100 on one side, and the joint body is connected to the downstream connection pipe P2 via the seal mechanism 100 on the other side.

  In this pipe joint A, for example, in the seal mechanism 100 corresponding to the downstream side connection pipe P2, the ring-shaped packing 20 that is externally fitted to the downstream side connection pipe P2 inserted into the joint body 10 includes: By being clamped by the end flange 11 of the joint body 10 and the fastening flange 12 as a counterpart member fastened to the end flange 11 by the coupling means 30, the joint body 10 is in close contact with the outer surface of the connection pipe P <b> 2 in a compressed state. Yes. The coupling means 30 includes a headed bolt 31 inserted through the bolt insertion holes 13 and 14 of the end flange 11 and the fastening flange 12, and a headed projection protruding from the bolt insertion hole 14 of the fastening flange 12. And a nut 32 screwed into the bolt 31. Since the seal mechanism 100 corresponding to the upstream connection pipe P1 has the same configuration, the same reference numerals are assigned to the corresponding elements, and detailed description thereof is omitted.

  In the seal mechanism 100 of the pipe joint A, the upstream connection pipe P1 is held in the joint body 10 by the clamping pressure exerted by the compressed packing 20, and the downstream connection pipe P2 is connected to the joint by the same clamping pressure. It is only held by the main body 10. Therefore, when the pressure in the flow direction generated by the water flow F exceeds a certain limit, the pipe joint A comes out from the upstream connection pipe P1 or the downstream connection pipe P2 comes out from the pipe joint A. obtain.

  FIG. 17 is a half-mounted longitudinal side view of a pipe joint described in another prior document (for example, Patent Document 2). As shown in the figure, the pipe joint A proposed by Patent Document 2 has both a sealing function exhibited by the sealing mechanism 100 and a retaining function exhibited by the retaining mechanism 200.

  In the seal mechanism 100, as described with reference to FIG. 16, the packing 20 that is externally fitted to the connecting pipe (downstream connecting pipe) P2 is composed of a headed bolt and a nut. It is clamped by the end flange 11 and the clamping flange that are clamped together by the coupling means 30 having the same configuration as described above, and is in close contact with the outer surface of the connecting pipe P2. Therefore, it is common with what is described in Patent Document 1 in that the connecting pipe P2 is only held by the joint body 10 by the clamping pressure of the compressed packing 20.

  On the other hand, the retaining mechanism 200 presses the retaining ring 51 that is externally fitted to the connecting pipe P <b> 2 by the tapered working surface 15 provided on the inner peripheral surface of the tightening flange 12. The axial movement of the retaining ring 51 (moving in the direction of arrow Z) can be prevented by the push-out shaft 55 backed up by the end flange 11 on the joint body side 10 side. The retaining ring 51 includes a flexible ring-shaped holder 52 that is externally fitted to the connection pipe P <b> 2, and a retaining hole that is held in a plurality of holes that are spaced apart from the holder 52. And a stop ball 54. In the retaining mechanism 200, when the retaining ring 51 is pressed by the working surface 15 of the tightening flange 12, the retaining ball 54 is sandwiched between the connecting tube P <b> 2 and the working surface 15 and the outer surface of the connecting tube P <b> 2 is held. The action of exerting a strong pressure and thereby preventing the connecting pipe 100 from coming out is exhibited. Although FIG. 17 shows only the connection structure between the pipe joint A and the connection pipe P2 on the downstream side, the connection structure between the upstream connection pipe and the pipe joint A is the same.

JP 10-317448 A JP 2005-308182 A

  As is apparent from the above, the pipe joint A shown in FIG. 17 is prevented from leaking water to the outside of the pipe line by the seal mechanism 100, and the pipe joint A from the upstream connecting pipe by the retaining mechanism 200. Is suppressed, and the connection pipe P2 on the downstream side from the pipe joint A is suppressed.

  However, in the pipe joint A shown in FIG. 17, the fastening flange 12 is formed in an annular shape, and when the fastening flange 12 is externally fitted to the connecting pipe P2, the end of the connecting pipe P2 is connected to the annular fastening flange. It is indispensable to perform an operation of inserting the outer cover 12 into the outer cover 12 and fitting it outside. Further, since the retaining ring 51 is also formed in an annular shape, the end of the connecting pipe P2 is inserted into the annular holder 52 when the retaining ring 51 is externally fitted to the connecting pipe P2. Work that fits outside.

  By the way, an example in which the pipe line using the pipe joint A shown in FIG. 16 is applied to a vertical drain for rainwater drainage exists as an existing pipe. On the other hand, in recent years, there is a fact that changes in the climate environment have increased the chances of extensive or local areas being exposed to heavy rain. Therefore, in a place where a pipe line that is provided with only the seal mechanism 100 shown in FIG. 16 and is not provided with the retaining mechanism 200 as shown in FIG. The pressure in the flow direction generated by the water flow F (see FIG. 16) of the passage exceeds a certain limit, so that the pipe joint A comes out from the upstream connection pipe P1, or the downstream connection pipe P2 comes out from the pipe joint A. Is happening.

  In order to improve such a situation, the existing pipeline as shown in FIG. 16 having only the seal mechanism 100 is replaced with a pipeline as shown in FIG. 17 having both the seal mechanism 100 and the retaining mechanism 200. Is effective. However, when attempting to replace such a pipeline, the existing pipeline is once disassembled, and then a pipeline as shown in FIG. 17 having both the seal mechanism 100 and the retaining mechanism 200 is newly constructed. Since it is forced to establish a new construction, not only a long work period is required, but also the cost is high.

  The present invention has been made in view of the above problems, and it is possible to prevent an existing pipe line as shown in FIG. 16 having only the seal mechanism 100 from being removed as shown in FIG. 17 without disassembling the pipe line. It aims at providing the pipe joint which can add the retaining mechanism 200 according to a mechanism.

  The pipe joint according to the present invention is externally fitted to the connection pipe inserted into the joint body by fastening a fastening flange, which is a counterpart member thereof, to the end flange of the tubular joint body by a coupling means. A seal mechanism capable of compressing the ring-shaped packing to be brought into close contact with the outer surface of the connection pipe; and a retaining mechanism for preventing the connection pipe from coming out of the joint body. The retaining mechanism is connected to the sealing mechanism via the retaining ring that is externally fitted to the connection pipe, the push ring that is externally fitted to the retaining ring, and the coupling means. A push ring tightening means capable of moving the push ring backward toward the tightening flange side of the seal mechanism, and a retaining ring provided on the inner peripheral surface of the push ring to retract the retaining ring by the backward movement of the push ring. A tapered working surface that is pressed in the radial direction; and a spacer that is backed up by the seal mechanism and prevents the follow-up movement of the retaining ring accompanying the backward movement of the push ring. Further, the retaining ring is configured to be fitted into the connecting pipe from the outside in the radial direction by being divided at one place or a plurality of places in the circumferential direction, and each of the push ring and the spacer is also configured. Further, by being divided at a plurality of locations in the circumferential direction, the connecting pipe is configured to be fitted from the outside in the radial direction.

  According to the pipe joint having this configuration, the seal of the seal mechanism seals the gap between the connecting pipe and the end flange of the joint body, thereby preventing water leakage to the outside of the pipe line. Further, in the retaining mechanism, when the push ring is moved backward by the push ring tightening means connected to the seal mechanism, the retaining ring whose outer surface is fitted to the connection pipe is pressed in the diameter reducing direction. To do. Further, when the push ring is moved backward by the push ring tightening means, the working surface of the push ring tends to follow the retaining ring externally fitted to the connecting pipe. Since it is blocked by the spacer backed up by the sealing mechanism, the working surface of the push ring presses the retaining ring in the radially inward direction, and as a result, the retaining ring strongly presses the connecting pipe. Thereby, the relative movement in the axial direction between the connection pipe and the push ring is prevented, and the push ring tightening means is coupled to the seal mechanism, so that the connection pipe and the push ring are relatively prevented from coming off.

  In particular, in the present invention, the retaining ring is divided at one place or a plurality of places in the circumferential direction. Each of the push wheel and the spacer is also divided at a plurality of locations in the circumferential direction. With this configuration, the retaining ring, the push ring, and the spacer can be fitted into the connecting pipe from the outside in the radial direction. Therefore, the above-described retaining mechanism can be assembled to the above-described sealing mechanism provided in the pipeline. In other words, a new retaining function can be easily and inexpensively added to an existing pipeline having only a sealing mechanism without disassembling the pipeline.

  In the present invention, the coupling means includes a headed bolt inserted into the bolt insertion hole of the end flange and the tightening flange, and a first screwed into the headed bolt protruding from the bolt insertion hole of the tightening flange. And a connecting nut that is inserted into the first bolt insertion hole of the flange provided in the spacer and is screwed into the headed bolt protruding from the first bolt insertion hole. The connecting shaft extends from the connecting nut and is inserted into the second bolt insertion hole of the flange provided on the push wheel, and the first screwed into the threaded portion of the connecting shaft protruding from the second bolt insertion hole. It is desirable to adopt a configuration that is configured by two nuts. According to this configuration, since the push ring tightening means can be connected to the seal mechanism by directly using the coupling means of the seal mechanism provided in the existing pipeline, when the retaining means is added to the existing pipeline. The push ring tightening means can be easily configured.

  In the present invention, the headed bolt protruding from the first nut is inserted into the first bolt insertion hole of the flange provided in the spacer, and the spacer is attached to the spacer by the connecting nut screwed into the headed bolt. It is desirable that the provided flange is configured to be fastened to the first nut. If it is this structure, it will become possible to add a retaining mechanism, without removing the headed bolt and 1st nut as a coupling means of the sealing mechanism with which the existing pipe line is equipped.

In the present invention, the push ring is divided into an inner ring provided with the working surface and an outer ring provided with the flange having the second bolt insertion hole and disposed outside the inner ring. It is desirable that the outer peripheral surface and the inner peripheral surface of the outer ring have inclined surfaces that are smaller in gradient than the working surface and overlap each other. When this configuration is adopted, the tightening force by the push ring tightening means is easily transmitted to the working surface of the push ring, and the retaining ring can be forced to be compressed in the reduced diameter direction.

  In the present invention, the retaining ring includes a flexible ring-shaped holder that is externally fitted to the connection pipe, and a retaining hole that is held in a plurality of holes that are provided at a plurality of positions spaced apart from the holder. It is possible to employ a configuration having a stop ball.

It is the vertical side view which showed the use condition of the pipe joint which concerns on embodiment of this invention. It is the vertical side view which expanded and showed the sealing mechanism of the pipe joint of FIG. It is the vertical side view which expanded and showed the retaining mechanism of the pipe joint of FIG. It is a front view of an end flange. It is a front view of packing. It is a front view of a clamping flange. It is a disassembled front view of a spacer. It is the front view which showed the shape of the spacer in use condition. It is the front view which showed the retaining ring of the natural state. It is the front view which showed the shape of the retaining ring in use condition. It is a disassembled front view of an inner ring. It is the front view which showed the shape of the inner ring | wheel in use condition. It is an exploded front view of an outer ring. It is the front view which showed the shape of the outer ring | wheel in use condition. It is the expanded vertical side view which showed the principal part of the retaining mechanism. It is a half mounting vertical side view of a pipe joint indicated in patent documents 1. It is a half-mounting vertical side view of the pipe joint described in Patent Document 2.

  Hereinafter, the embodiment of the pipe joint concerning the present invention is described. FIG. 1 is a longitudinal side view showing the use state of the pipe joint A, FIG. 2 is an enlarged vertical side view showing the seal mechanism 100 of the pipe joint A of FIG. 1, and FIG. 3 is an extraction of the pipe joint A of FIG. It is the vertical side view which expanded and showed the stop mechanism 200. FIG.

  As shown in FIG. 1, the pipe joint A includes both a sealing mechanism 100 and a retaining mechanism 200, and the upstream connecting pipe P <b> 1 has a cylindrical shape via the sealing mechanism 100 and the retaining mechanism 200. One end of the joint body 10 is connected, and a downstream connection pipe P <b> 2 is connected to the other end of the joint body 10. Further, the seal mechanism 100 and the retaining mechanism 200 provided on each of the one end side and the other end side of the joint main body 10 have configurations that are symmetrical to each other via the axial center portion of the joint main body 10. Therefore, with the intention of simplifying the description, the seal mechanism 100 and the retaining mechanism 200 provided at the connection location between the joint body 10 and the downstream connection pipe P2 will be described below.

  As shown in FIG. 2, the seal mechanism 100 has a ring-shaped packing 20 that is externally fitted to a downstream connecting pipe P <b> 2 inserted into the joint body 10, and the packing 20 is an end portion of the joint body 10. By being clamped by the flange 11 and a clamping flange 12 as a mating member fastened to the end flange 11 by the coupling means 30, it is in close contact with the outer surface of the connecting pipe P2 in a compressed state.

  4 is a front view of the end flange 11, FIG. 5 is a front view of the packing 20, and FIG. 6 is a front view of the fastening flange 12. As shown in FIGS. 4 to 6, the end flange 11, the packing 20, and the fastening flange 12 are all formed in an annular shape, and are externally fitted to the connection pipe P <b> 2 from the end of the connection pipe P <b> 2. Yes. Further, the end flange 11 and the tightening flange 12 are provided with bolt insertion holes 13..., 14. The coupling means 30 includes a headed bolt 31 inserted into the bolt insertion holes 13 and 14 of the end flange 11 and the fastening flange 12 and a headed bolt 31 protruding from the bolt insertion hole 14 of the fastening flange 12. The first nut 32 is screwed into the first nut 32. According to the sealing mechanism 100 described above, the packing 20 seals the gap between the connecting pipe P2 and the end flange 11 to prevent water leakage to the outside of the pipe line.

  As shown in FIG. 3, the retaining mechanism 200 includes a retaining ring 51 that is externally fitted to the downstream connecting pipe P <b> 2, a push ring 60 that is externally fitted to the retaining ring 51, and the push ring 60. Push ring tightening means 70 that can be moved backward toward the tightening flange 12 (see FIGS. 1 and 2) of the seal mechanism 100, and the retaining ring provided on the inner peripheral surface of the push ring 60. A tapered working surface 61 that overlaps the outer peripheral surface of 51, and a cylindrical spacer 80 interposed between the seal mechanism 100 and the retaining ring 51.

  FIG. 7 is an exploded front view of the spacer 80, and FIG. 8 is a front view showing the shape of the spacer 80 in use. FIG. 9 is a front view showing the retaining ring 51 in a natural state, and FIG. 10 is a front view showing the shape of the retaining ring 51 in a used state.

  As shown in FIG. 7, the spacer 80 is divided into three equal-length segments 81. Utilizing this fact, the respective segments 81 are fitted into the connecting pipe P2 from the outside in the radial direction and assembled into the cylindrical spacer 80. Further, the cylindrical spacer 80 is provided with projecting piece-like flanges 82 protruding from the end portions of the segments 81 at three positions at equal circumferential intervals, and each flange 82. A 1-bolt insertion hole 83 is provided.

  As shown in FIG. 9, the retaining ring 51 is divided at one place in the circumferential direction. The retaining ring 51 is fitted into the connecting pipe P2 from the outside in the radial direction by pushing an opening formed by opening the divided portion A into the connecting pipe P2. Then, the retaining ring 51 that is externally fitted to the connecting pipe P2 has an annular shape as shown in FIG. The retaining ring 51 includes a flexible ring-shaped holder 52 that is externally fitted to the connecting pipe P <b> 2, and a retaining member that is held in a plurality of holes 53 that are spaced apart from the holder 52. A retaining ball 54, and the retaining ball 54 is rotatable in the hole 53.

  The push ring 60 shown in FIG. 3 is divided into an inner ring 62 and an outer ring 63 arranged outside the inner ring 62. The tapered working surface 61 formed on the inner peripheral surface of the inner ring 62 overlaps the tapered receiving surface 56 formed on the outer peripheral surface of the holder 52 of the retaining ring 51 and overlaps each other. The surface 61 and the receiving surface 56 are gradually increased in diameter in the pushing direction of the retaining ring 51 by the push ring 60, in other words, in the direction approaching the seal mechanism 100. In addition, inclined surfaces 64 and 65 that overlap each other are formed on the outer peripheral surface of the inner ring 62 and the inner peripheral surface of the outer ring 63.

  FIG. 15 is an enlarged longitudinal sectional side view showing a main part of the retaining mechanism 200. In the figure, the symbol θ1 indicates the inclination angle of the working surface 61 of the inner ring 62 with respect to the axis, and the symbol θ2 indicates the inclination angles of the inclined surfaces 64 and 65 of the inner ring 62 and the outer ring 63 with respect to the axis. As shown in the figure, the inclination angle θ1 of the action surface 61 is set larger than the inclination angle θ2 of the inclined surfaces 64 and 65 (θ1> θ2).

  FIG. 11 is an exploded front view of the inner ring 62, and FIG. 12 is a front view showing the shape of the inner ring 62 in use. As shown in FIG. 11, the inner ring 62 is divided into two equal-length segments 66, 66 having a semicircular arc when viewed from the front. Utilizing this fact, the two segments 66, 66 are fitted into the connecting pipe P2 from the outside in the radial direction and assembled into the cylindrical inner ring 62.

  FIG. 13 is an exploded front view of the outer ring 63, and FIG. 14 is a front view showing the shape of the outer ring 63 in use. The outer ring 63 has three arc-shaped segments 67 of equal length in front view, and projecting piece-like flanges 69 having second bolt insertion holes 68 are continuously provided at both ends of each segment 67. Yes. The outer ring 63 is assembled by connecting the three segments 67 in an annular shape. In a state where the three segments 67 are assembled in an annular shape, the corresponding flanges 69 and 69 of the adjacent segments 67 and 67 are overlapped so that the second bolt insertion holes 68 and 68 overlap each other. It has become. Utilizing this, each arc-shaped segment 67 is fitted into the connecting pipe P2 from the outside in the radial direction and assembled into the annular outer ring 63.

  The press ring tightening means 70 shown in FIG. 3 includes a connecting shaft 72 extending axially rearward from the connecting nut 71 and a second nut 74 that can be screwed into a threaded portion 73 of the connecting shaft 72. ing.

  Next, when the retaining mechanism 200 that exhibits the retaining function shown in FIG. 2 is added to the existing pipeline having only the sealing mechanism 100 that exhibits the sealing function, the sealing mechanism 100 is used as it is. An example of the construction process will be described.

  In the first stage of the construction process, the spacer 80 is provided in the downstream connection pipe P2 to which the seal mechanism 100 shown in FIGS. 1 and 2 is applied. That is, the cylindrical spacer 80 is assembled by fitting the three segments 81 shown in FIG. 7 into the connecting pipe P2 from the outside in the radial direction, and together with that, the coupling means 30 of the seal mechanism 100 is configured. The headed bolt 31 protruding from the first nut 32 is inserted into the first bolt insertion hole 83 of the flange 82 provided in the spacer 80. As a result, the headed bolt 31 protrudes from the flange 82 of the spacer 80.

  In the next stage, the connecting nut 71 of the press ring tightening means 70 is screwed into the headed bolt 31 protruding from the flange 82 of the spacer 80 and tightened. This operation is performed on the headed bolts 31 located at three locations in the circumferential direction of the spacer 80. As a result, the three flanges 82 are fastened to the first nut 32 by the connecting nuts 71.

  In the next stage, the opening formed by opening the divided portion (a) of the retaining ring 51 shown in FIG. 9 is pushed into the connecting pipe P2, and by doing so, the retaining ring is radially inserted into the connecting pipe P2. 51 is fitted and the shape is returned to an annular shape. Thereby, the retaining ring 51 is externally fitted to the connecting pipe P2.

  In the next stage, the push ring 60 is fitted on the retaining ring 51. At this stage, an inner ring mounting process in which the inner ring 62 is disposed outside the retaining ring 51 and an outer ring mounting process in which the outer ring 63 is disposed outside the inner ring 62 are performed. In the inner ring mounting process, the cylindrical inner ring 62 is assembled by fitting two semicircular arc segments 66, 66 into the connecting pipe P2 from the outside in the radial direction, and the working surface 61 provided on the inner ring 62 by the assembly. Is superposed on the receiving surface 56 provided in the holder 52 of the retaining ring 51. In the next outer ring mounting step, three arc-shaped segments 67 are arranged outside the inner ring 62 and assembled into an annular shape, and the corresponding flanges 69 of the three segments 67 are overlapped with each other. The connecting shaft 72 extending from the connecting nut 71 positioned at three places in the circumferential direction is inserted into the second bolt inserting hole 68 positioned. Then, the inclined surfaces 64 and 65 of the inner ring 62 and the outer ring 63 are overlapped.

  In the final stage, the second nut 74 is screwed into each of the threaded portions 73 of the three connecting shafts 72 protruding in the circumferential direction from the second bolt insertion hole 68 of the outer ring 63 as shown in FIG.

  When the construction process described above is performed, the flange 82 of the spacer 80 is clamped by the first nut 32 on the seal mechanism 100 side and the connecting nut 71 on the retaining mechanism 200 side and fixed to the seal mechanism 100 as shown in FIG. Is done. At the same time, the spacer 80 is interposed between the sealing mechanism 100 and the retaining ring 51 on the retaining mechanism 200 side while being backed up by the sealing mechanism 100, so that the end surface of the retaining ring 51 (the end surface of the holder 52). Abut.

  Further, since the push ring 60 is pressed against the tightening flange 12 side of the seal mechanism 100 by the tightening action of the second nut 74, the action surface 61 of the inner ring 62 constituting the push ring 60 reduces the diameter of the retaining ring 51. Press in the direction. For this reason, the retaining ball 54 of the retaining ring 51 is sandwiched between the working surface 61 and the connecting pipe P2 to strongly press the outer surface of the connecting pipe P2, and in the axial direction and the circumferential direction of the push ring 60 and the connecting pipe P2. Relative movement is prevented. Therefore, coupled with the fact that the retaining mechanism 200 is connected to the seal mechanism 100 of the pipe joint A by the push ring tightening means 70, the withdrawal of the connecting pipe P2 from the pipe joint A is prevented or suppressed.

  In particular, in this embodiment, as described with reference to FIG. 15, each inclination of the inner ring 62 and the outer ring 63 that overlap each other is larger than the inclination angle θ1 of the working surface 61 of the inner ring 62 that overlaps the retaining ring 51. The inclination angle θ2 of the surfaces 64 and 65 is small (θ1> θ2). As described above, when the push ring 60 is divided into the inner ring 62 and the outer ring 63, the inclination angle θ2 of the inclined surfaces 64 and 65 of the inner ring 62 and the outer ring 63 is made smaller than the inclination angle of the working surface 61. Further, the influence of the tightening force by the push ring tightening means 70 does not force the outer ring 63 to the inner ring 62 through the inclined surfaces 64, 65, and further from the inner ring 62 to the retaining ring 51 through the action surface 61. Therefore, the effect of reducing the diameter of the retaining ring 51 and forcing the outer surface of the connecting pipe P2 with the retaining ball 54 is efficiently exhibited. This improves the effect of preventing or suppressing the withdrawal of the connecting pipe P2 from the pipe joint A by the retaining mechanism 200.

  In addition, since the retaining ball 54 of the retaining ring 51 is rotatable while being held in the hole 53 of the holder 52, the connecting pipe P2 is displaced in the withdrawal direction due to the influence of water pressure. When this occurs, the retaining ball 54 rolls on the outer surface of the connecting pipe P2 and increases the pressing force against the outer surface of the connecting pipe P2, so that the retaining action is reliably and reasonably exerted by the retaining ring 51. Will be. In addition, there is an advantage that scratch marks due to the retaining balls 54 hardly remain on the outer surface of the connection pipe P2.

  In the embodiment described above, an example in which the retaining ring 51 is divided at only one place in the circumferential direction has been described. However, the divided place may be a plurality of places. When the retaining ring 51 is divided at a plurality of locations, the retaining ring 51 is constituted by two or more arc-shaped segments. The spacer 80 is also divided into three arc segments 81 in the above embodiment, but the spacer 80 can be divided into two or more arc segments.

  In the above embodiment, the push ring 60 is divided into the inner ring 62 and the outer ring 63. However, the push ring 60 does not necessarily need to be divided and can be constituted by one annular member. is there. Further, the number of divisions in the circumferential direction of the inner ring 62 and the outer ring 63 is not limited to that described in the embodiment, and even if the inner ring 62 is divided into more than three segments, the outer ring 63 can be divided into two or four. It may be divided into a plurality of segments.

In the present invention, the coupling means 30 between the end flange 11 of the joint main body 10 and the fastening flange 12 which is the counterpart member thereof includes the headed bolt 31 and the first nut 32 described in the embodiment.
In addition to the above, it is possible to adopt any configuration that can connect the push ring tightening means 70.

A Pipe joint P2 Connection pipe 10 Joint body 11 End flange 12 Tightening flange 13 Bolt insertion hole of end flange 14 Bolt insertion hole of tightening flange 20 Ring-shaped packing 30 Coupling means 31 Head bolt 51 Detent ring 52 Holder 54 Detachment Retaining ball 60 Push ring 61 Working surface 62 Inner ring 63 Outer ring 64, 65 Inclined surface 68 Second bolt insertion hole 69 Flange of push ring (outer ring) 70 Push ring tightening means 71 Connection nut 72 Connection shaft 73 Connection shaft thread 74 74 2 nut 80 spacer 32 first nut 82 spacer flange 83 first bolt insertion hole 100 seal mechanism 200 retaining mechanism

In the present invention, the coupling means includes a headed bolt inserted into the bolt insertion hole of the end flange and the tightening flange, and a first screwed into the headed bolt protruding from the bolt insertion hole of the tightening flange. is constituted by a nut, the press wheel fastening means comprises a connecting nut which is screwed to the tap bolt projecting from the first bolt insertion hole is inserted through the first bolt insertion hole of the flange which is provided on the spacer The connecting shaft extends from the connecting nut and is inserted into the second bolt insertion hole of the flange provided on the push wheel, and the first screwed into the threaded portion of the connecting shaft protruding from the second bolt insertion hole. It is desirable that it is composed of two nuts. According to this configuration, since the push ring tightening means can be connected to the seal mechanism by directly using the coupling means of the seal mechanism provided in the existing pipeline, when the retaining means is added to the existing pipeline. The push ring tightening means can be easily configured.

In the present invention, by the first the coupling nut protrudes from the nut screwed into the head bolt which extends through the first bolt insertion hole of the flange, as the flange is tightened to the first nut It is desirable to be configured. If it is this structure, it will become possible to add a retaining mechanism, without removing the headed bolt and 1st nut as a coupling means of the sealing mechanism with which the existing pipe line is equipped.

Claims (5)

By tightening the fastening flange, which is the counterpart member, to the end flange of the tubular joint body by the coupling means, the ring-shaped packing externally fitted to the connecting pipe inserted into the joint body is compressed and the above-mentioned A pipe joint comprising: a seal mechanism capable of being brought into close contact with the outer surface of the connection pipe; and a retaining mechanism for preventing the connection pipe from coming out of the joint body,
The retaining ring is connected to the sealing mechanism via the coupling means, the retaining ring that is externally fitted to the connection pipe, the push ring that is externally fitted to the retaining ring, and the push ring. A press ring tightening means capable of moving the seal ring backward toward the tightening flange side of the seal mechanism, and a retaining ring provided on the inner peripheral surface of the press ring and retracting the retaining ring by the reverse movement of the press ring A tapered working surface that presses against the spacer, and a spacer that is backed up by the sealing mechanism and prevents the follow-up movement of the retaining ring accompanying the backward movement of the push ring,
The retaining ring is configured so that it can be fitted into the connecting pipe from the outside in the radial direction by being divided at one or a plurality of locations in the circumferential direction. The pipe joint is configured to be fitted into the connection pipe from the outside in the radial direction by being divided at a plurality of locations in the circumferential direction.   The coupling means includes a headed bolt inserted into the bolt insertion hole of the end flange and the tightening flange, and a first nut screwed into the headed bolt protruding from the bolt insertion hole of the tightening flange. The push ring tightening means is inserted into the first bolt insertion hole of the flange provided in the spacer and is screwed into the headed bolt protruding from the first bolt insertion hole, and the connection nut A connecting shaft extending from the second bolt insertion hole of the flange provided on the push ring and a second nut screwed into the threaded portion of the connecting shaft protruding from the second bolt insertion hole. The pipe joint according to claim 1, which is configured.   The flange provided in the spacer by the connection nut inserted into the first bolt insertion hole of the flange provided in the spacer, and the head bolt protruded from the first nut and screwed into the head bolt. The pipe joint according to claim 2, which is configured to be fastened to the first nut.   The push ring is divided into an inner ring having the working surface and an outer ring provided on the outer side of the inner ring with the flange having the second bolt insertion hole, and an outer peripheral surface and an outer ring of the inner ring. The pipe joint according to claim 2 or 3, wherein the inner peripheral surface is provided with inclined surfaces that are smaller in gradient than the working surface and overlap each other.   The retaining ring is a flexible ring-shaped holder that is externally fitted to the connecting pipe, and retaining balls that are held in holes that are opened at a plurality of positions spaced apart from the holder, The pipe joint according to any one of claims 1 to 4, which has the following.

Images