JP4500882B1 - Housing type pipe fitting - Google Patents

Abstract

An object of the present invention is to make it possible to confirm an appropriate fastening condition of a joint and reduce a burden of fastening work.
[Solution]
Fastening means for fastening the pair of joint segments, the elastic seal ring, and the pair of joint segments, the joint segment is formed on an arc part, a flange part extending from both ends of the arc part, and an arc part inner peripheral surface, It has a concave groove into which an elastic seal ring is fitted, and it is bent so that the radius of curvature of the arc portion becomes small by bringing the flanges of the joint segments closer by the fastening means, and the peripheral edge of the arc portion is bent by the bending. in the housing form fitting configured as connecting tubes to each other is completed by matching the tube outside surface to be connected, has a mark on the arcuate portion peripheral edge portion, the arc portion periphery corresponding to the mark A housing-type pipe joint characterized in that the connection between the pipes is completed when the end edge is in contact with the outer surface of the pipe.
[Selection] Figure 1

Description

  The present invention relates to a housing-type pipe joint that connects pipe ends while sealing each other.

A conventional housing type pipe joint 100H is shown in FIG . In this housing-type pipe joint, the pipe ends of pipes 150 and 150 having circumferential grooves 151 and 151 at the pipe end portions are concentrically abutted with each other, and an annular elastic seal ring 102 is externally fitted to the joint portion. A pair of substantially semicircular joint segments 101, 101 are formed on the inner peripheral surface of the pipe end portion via the elastic seal ring 102 so that the ridges 113, 113 are accommodated in the circumferential grooves 151 , 151. The two fastening portions 101 and 101 are formed by screwing fastening means including bolts 103 and 103 and nuts 104 and 104 into the bolt insertion holes 121 and 121 provided in the flange portions 120 and 120 facing each other of the joint segments 101 and 101, respectively. Connect the tubes together.

  In this connection, the flanges 120 and 120 facing the pair of joint segments 101 and 101 are brought close to each other by the fastening means 103 and 104, so that the curvature radii of the joint segments 101 and 101 are reduced. The peripheral edges 114, 114 hold the outer surfaces 152, 152 of the respective pipe outer surfaces (in the illustrated example, the bottom of the circumferential groove 151 is not necessarily limited to this), but the displacement of the pipe axes of the two pipes can be reduced. Displacement is prevented.

  In this connection, the confirmation of the completion of the connection in the housing-type pipe joint 100H is made when the entire range of the peripheral end edges 114, 114 of the joint segments 101, 101 coincides with the pipe outer surfaces 152, 152. .

However, when the pipes are connected by the housing-type pipe joint 100H, for example, even if the movement of the pipe axis of each pipe 150 , 150 is prevented by the peripheral end edges 114, 114, the above-mentioned pipes are the housing-type pipes. It is only necessary that the movement is sufficiently restricted by the joint 100 </ b> H, and it is not necessary that the entire range of the peripheral end edges 114 and 114 coincide with the pipe outer peripheral surfaces 152 and 152.

  In the conventional housing-type pipe joint 100H, when the appropriate fastening degree, that is, how much the joint segments 101, 101 are bent and the extent of the peripheral edges 114, 114 are aligned with the pipe outer surfaces 152, 152, the connection is established. It is not possible to understand whether the function is sufficiently exerted, and as a result, until the entire range of the peripheral end edges 114 and 114 where the bending of the joint segments 101 and 101 is possible to the maximum coincides with the pipe outer surfaces 152 and 152, It is necessary to bring the flange portions 120, 120 of the joint segments 101, 101 close to each other, and an extremely complicated and wasteful operation is required.

On the other hand, when attaching the conventional housing-type pipe joint 100H, the bolts 103 and 103 and the nuts 104 and 104 are once removed from the flange portions 120 and 120 of the joint segments 101 and 101, and the annular elastic seal ring 102 is joined. Then, the joint segments 101 and 101 are fitted onto the elastic seal ring 102 while visually confirming that the locking pieces 113 and 113 are accommodated in the circumferential grooves, and the bolts 103 and 103 are again fitted. An extremely complicated operation of inserting the nuts 104, 104 through the bolt insertion holes 121, 121 of the opposing flange portions 120, 120 is required.

JP-A-11-241793 JP-A-11-241794 JP2008-019976 JP2008-019995

  Therefore, the main problem of the present invention is to reduce the fastening work and to reliably perform the pipe connection in the housing-type pipe joint that connects the pipes by bending so that the radius of curvature of the arc portion is reduced by fastening means such as bolts and nuts. It is possible to check the fastening end position where the pipes are connected, and it is possible to easily install the pipes at appropriate positions between the pipe ends without disassembling the housing. Furthermore, it is possible to reliably connect and fix both pipes even if there is an error in the depth of the circumferential groove of the pipes to be connected.

The present invention that has solved the above-described problems and the effects thereof are as follows.
<Invention of Claim 1>
A housing-type pipe joint that connects pipes facing each other,
A fastening means for fastening the pair of joint segments, the elastic seal ring, and the pair of joint segments;
The joint segment has an arc portion, a flange portion extending from both ends of the arc portion, and a concave groove formed on the inner peripheral surface of the arc portion and into which the elastic seal ring is fitted.
By bending between the flanges of both joint segments by means of the fastening means, the radius of curvature of the arc portion is reduced, and the bending causes the peripheral edge of the arc portion to coincide with the outer surface of the pipe to be connected. in the housing form fitting configured to coupled is completed,
It has a mark on the peripheral edge of the arc portion, and is configured so that the connection between the tubes is completed when a portion of the peripheral edge of the arc portion corresponding to the mark contacts the outer surface of the pipe Housing type pipe joint.

(Function and effect)
With conventional housing-type pipe joints, the proper fastening, that is, the amount of bending of the arc portion, cannot be understood. As a result, the entire length of the peripheral edge of the arc portion where the arc portion can be bent to the maximum matches the pipe outer surface. However, it is necessary to keep the flanges of the facing segments close to each other, which requires extremely complicated and wasteful operation. However, since the housing-type pipe joint of the present invention has a mark, it has a sufficient peripheral end for connection. The abutting range of the edge can be understood in advance, and excessive bending of the arc portion is unnecessary, so that an appropriate fastening operation can be performed. This reduces the burden of fastening work. Further, if a mark is positioned on each end side, it is possible to prevent a left-right shift.
Note that "corresponding to the mark" means that the mark itself is not in contact with the outer surface of the pipe, but for example, the mark is an arrow or the like, and the position indicated by the arrow or the like includes being in contact with the outer surface of the pipe. Is.

<Invention of Claim 2>
The housing-type pipe joint according to claim 1, wherein the mark is provided at both arc ends of the circumferential edge of the arc portion.

<Invention of Claim 3>
3. The housing-type pipe joint according to claim 1, wherein the mark is located at a position of 15 to 60 degrees with respect to a perpendicular line from the arc center of the arc portion to the center of the arc portion.

(Function and effect)
When the position of the mark is at a position of 15 to 60 degrees with respect to a perpendicular line toward the center of the arc part, the arc part peripheral edge is relative to the outer surface of the pipe from the arc center of the arc part of the peripheral edge of the arc part. It can contact in the range of 30 to 120 degrees with respect to a perpendicular line toward the center. And if this range touches, it will be sufficient for connection fixation, and the reduction of a fastening work burden will also be sufficient.

<Invention of Claim 4>
The joint segment has a circular arc portion peripheral edge cut out in a predetermined range starting from both flange portions side ends, and the end of the cut out portion is the mark. The housing type pipe joint described in 1.

(Function and effect)
When the circumferential edge of the arc portion is notched within a predetermined range starting from both flange portion side ends, and the end of the notch is the mark, the force for approaching between the flanges is reduced, and The amount and position of the peripheral edge of the arcuate portion in contact with each other can be easily confirmed visually, and the burden of fastening work can be reliably reduced. In addition, the mark by the notch portion is preferable from the viewpoint of durability because there is no fear of peeling of the paint as compared with the mark by coating or the like.

<Invention of Claim 5>
The housing shape fitting is for connecting and fixing the tubes each having a circumferential groove in the pipe end portion,
The joint segment has a ridge portion located in the circumferential groove on the inner peripheral surface of the arc portion,
And each joint segment is rotated in the opposite direction with the approach between the facing flanges by the fastening means,
5. Any one of claims 1 to 4, wherein when the portion of the circumferential edge of the arc portion corresponding to the mark comes into contact with the outer surface of the tube by this rotation, the protruding portion is pressed against the distal end side wall of the circumferential groove. The housing type pipe joint according to claim 1.

(Function and effect)
In the housing-type pipe joint of the present invention, when the portion of the circumferential edge of the arc portion corresponding to the mark is in contact with the outer surface of the pipe, that is, when the fastening is completed, the protruding portion presses against the distal end side wall of the circumferential groove of the pipe. Therefore, for example, the pipes are reliably connected and fixed by the protrusions regardless of whether there is an error in the pipe diameter or an error in the depth of the circumferential groove.
In addition, in the fastening completion position according to the mark, if there is a gap between the protruding portion and the proximal end side wall of the circumferential groove, while restricting the movement of the tubes to approach, The pipe ends are connected while being sealed while the pipe is allowed to move slightly to be separated. Further, once the tubes are separated from each other, the tubes can be moved closer to each other thereafter. Furthermore, the tubes are connected to each other in a state where a certain amount of movement on the distal end side of the tubes is allowed. Therefore, the pipe joint of the present invention can connect the pipes while ensuring the expansion and contraction flexibility of the pipe line.

<Invention of Claim 6>
The elastic seal ring has an annular piece extending between the pipe end faces of the pipes to be connected, extending to the inner peripheral side, and the axis of the annular piece is not parallel to the axis of the joint segment The housing-type pipe joint according to claim 5, wherein the housing-type pipe joint is fitted in the groove in advance.

(Function and effect)
In the housing type pipe joint of the present invention, the elastic seal ring held in the housing has an annular piece. Since this annular piece extends to the inner peripheral side of the elastic seal ring, the pipe end face can be brought into contact with both sides of the annular piece (both ends of the elastic seal ring), and the housing can be seen without visual confirmation. The elastic seal ring can be reliably positioned at a desired position of the shape pipe joint.
In addition, since the elastic seal ring is pre-supported in the concave groove of the joint segment, when the pipe end surface is brought into contact with both sides of the annular piece (both ends of the elastic seal ring), the joint segment is Since it is positioned between the parts, the preparation for tightening can be completed very easily.

In addition, the housing type joint of the present invention, the holding axis of the annular piece non parallel to the axis of the joint segments, i.e. the axis of the annular piece is inclined with respect to the axis of the coupling segments Therefore, the joint segment is in a state before the predetermined rotation and the installation preparation is completed only by bringing the pipe end face into contact with both sides of the annular piece.
Here, in the housing type pipe joint of the present invention, the elastic seal ring is supported in the concave groove, and when the joint segment is rotated, the elastic seal ring is pressed by the concave groove wall with the rotation. made, but due to the deformation of the elastic sealing ring, to never rotate the coupling segments is restricted, it does not occur Re screws of the elastic sealing ring by the rotation of the coupling segments.

Furthermore, if the elastic seal ring has a lip seal mechanism that has a groove portion between the annular piece and the opening edge at both ends, and the groove width is expanded by the pressure of the fluid flowing through the groove portion, the elastic seal ring is elastic. the seal ring is without being contacted with the constantly pressurized to the tube, the width of the groove is extended sealing function between the annular piece and the opposite ends opening edge is exerted at the time of need, over time of the elastic sealing ring This is a housing-type pipe joint with little deterioration and high durability.

<Invention of Claim 7>
The arcuate outer peripheral arc end portion has a stepped portion comprising an L-shaped projecting ridge and an L-shaped missing portion formed continuously with the L-shaped projecting ridge, and between the facing flanges by the connecting means The L-shaped projecting ridge and the L-shaped defect portion facing each other as the joint approaches and the joint segment rotates are fitted into each other, and when the mark is substantially in contact with the outer surface of the pipe, they are completely fitted together. The housing-type pipe joint according to claim 4 or 5, which forms a stamped joint for restricting movement of the housing.

(Function and effect)
The housing type pipe joint of the present invention has an L-shaped projecting ridge and an L-shaped defective portion formed continuously with the L-shaped projecting ridge so that they can be fitted together, and the stamped joint that restricts the movement of each other is connected. Because it is formed, the joint segment does not over-rotate, and the housing-type pipe joint can be set securely at the desired position, and the elastic seal ring twisting, ridge damage, and pipe damage due to over-rotation are prevented. Is done.

  The specific operational effects of the invention described in each claim are as described above. However, the housing type pipe joint of the present invention is commonly bent so that the radius of curvature of the arc portion is reduced by a fastening means such as a bolt and nut. This makes it possible to reduce the tightening work for housing-type pipe joints that connect pipes to each other, and to confirm the position of complete fastening, and to install the housing at an appropriate position between the pipe ends without disassembling the housing. It is possible to connect the pipes with ease, and even if there is an error in the depth of the circumferential groove of the pipes to be connected, both pipes can be securely connected and fixed. A possible housing-type fitting is provided.

  In addition, this housing-type pipe joint has a specific effect that allows both pipes to be reliably connected even if there is an error in the depth of the circumferential groove of the pipe to be connected. Furthermore, the housing-type pipe joint of the present invention can be connected while sealing the ends of both pipes while restricting the movement of the pipes to approach each other and allowing a slight movement of the pipes to be separated. Since the pipes can be connected with play, the expansion and contraction flexibility of the pipe line can be secured, and for example, it is suitable for connection between underground pipes having many opportunities to receive external force.

It is a disassembled front view of the housing type pipe joint of this invention. It is a front view after the fastening of the housing type pipe joint of the present invention. It is a front schematic diagram which shows the aspect before and behind the fastening of the joint segment of this invention. It is a front schematic diagram of the joint segment of other forms of the present invention. It is a front schematic diagram of the joint segment of another form of this invention. It is an inner surface figure of the joint segment of this invention. It is a partial cross section figure of the joint segment of the present invention. It is a partial cross section figure of the elastic seal ring concerning this invention. It is a top view before the fastening of the housing type pipe joint of this invention. It is a top view after the fastening of the housing type pipe joint of the present invention. It is a side view of the housing type pipe joint of the present invention. It is a disassembled perspective view of the conventional housing type pipe joint.

Next, the case where the pipes 50 and 50 having the circumferential grooves 51 and 51 are connected to each other will be mainly described in detail below with reference to FIGS.
<Structure>
The housing type pipe joint H of this embodiment includes a pair of joint segments 1 , 1, an annular elastic seal ring 2, and a bolt 3 and a nut 4 that are fastening means for fastening the joint segments 1, 1 together. Here, the shape of the pair of joint segments 1 and 1 is the same. Therefore, in the description of the shape, one joint segment 1 is taken as an example.

  The joint segment 1 has a substantially arc-shaped arc portion 10 in which ends of facing tubes 50 and 50 are accommodated, and flange portions 20 and 20 extending outward from both ends of the arc portion 10 respectively. The flange portions 20 and 20 are formed with bolt insertion holes 21 and 21 for inserting the bolts. The bolt insertion hole 21 is formed in an elliptical long hole whose major axis is the axial direction of the arc portion of the joint segment 1, and has a width having an appropriate margin with respect to the screw portion of the bolt that is also inserted in the minor axis direction. Thus, the bolt 3 can be loosely inserted into the bolt insertion hole 21.

The arc portion 10 as a whole is formed in advance with a radius of curvature slightly larger than the diameter of the pipe 50 to be connected in advance, and the pipe end of the pipe 50 to be connected is easily and reliably positioned in the arc portion 10. Configured to be able to. The arc portion 10 is bent by tightening the nut 4 with respect to the bolt 3 via the flange portion 20, and the radius of curvature thereof is slightly reduced, and the arc portion peripheral edge 10E is positioned in the arc portion by the bending. It is comprised so that the site | part contact | abutted to the outer surface of a pipe | tube may be increased. Here, the contact of the peripheral edge of the arc portion in the present invention with the outer surface is one of the essential functions of restricting the movement of the housing-type joint to the pipe and securely fastening the inner peripheral surface of the arc portion. Is preferably a smooth arc surface from the periphery of the arc portion to the groove (in the case of having a protrusion).

  In addition, the joint segments 1 and 1 of the present embodiment are integrally formed with the flanges 20 and 20 with a slight acute angle with respect to the arc portions 10 and 10 ends, as is apparent from the front view shown in FIG. Further, it is configured such that a bending force is easily applied so that the radius of curvature of the arc portions 10 and 10 is reduced.

  Here, in the joint segment 1 of the present invention, the mark 10M is characteristically formed at both arc ends of the arc portion peripheral end edge 10e, and the arc portion peripheral end edge 10E corresponding to the mark 10M is formed. When contacting the outer surface of the tube 50, the connection between the tubes is completed. Here, the circular arc peripheral edge 10e is the vicinity of the circular arc peripheral edge 10E, and is a portion that can be visually recognized at least in a front view of the housing joint.

  In the preferred form shown in the figure, the mark 10M is cut out in a predetermined range with both flange portions side ends of the arcuate circumferential edge 10e of the joint segment 1 as base points 11a, and the end 11b of the notch 11 is the mark 11 10M. When the notch end 11b is used as a mark in this way, the force for bringing the flange portions closer due to the presence of the notch portion 11 is reduced, and the amount (length) and position of the arcuate circumferential edge 10E in contact with the flange portion are reduced. Becomes very easy to check visually, and the burden of fastening work is surely reduced. Further, the mark 10M based on the notch 11 is desirable from the viewpoint of durability because there is no fear of peeling of the paint as compared with the mark by coating or the like. Furthermore, the mark 10M based on the notch portion 11 is desirable in that it can be confirmed by tactile accuracy with a hand or the like.

  However, it is sufficient if the position of the mark 10M can be confirmed. The mark 10M is not limited to the shape of the notch, and for example, as shown in FIGS. 4 and 5, a triangle mark, a round dot, or the like is not shown. It may be a mode in which scales or letters are provided in the entire peripheral part of the week or part thereof. Of course, also in this case, the specific configuration can be confirmed by visual observation or touch, such as painting (printing) and protrusions.

  A more specific preferable position of the mark 10M is a position in a range of 15 to 60 degrees (this range is indicated by α in FIG. 3) with respect to a perpendicular L1 from the arc center 10c of the arc portion 10 to the center of the arc portion. It is. In this position, at the time of completion of fastening, at least the range of 30 to 120 degrees of the arc edge 10E (this range is indicated by β in the figure) coincides with the outer surface of the pipe 50 to be connected, Normally, if the range β is approximately equal, the pipe 50 and the joint segment 1 will not be displaced after the completion of fastening. Further, even if the position is 60 degrees or more, that is, even if it coincides with the outer surface of the pipe 50 to be connected within the range of 120 degrees or more of the circumferential edge 10E of the arc portion, the effect of preventing the displacement of the pipe 50 and the joint segment 1 is enhanced. However, the force for fastening is excessively increased, and an unnecessary work amount force is required.

On the other hand, the housing type pipe joint H of the present embodiment adopts the following preferable configuration while having the characteristic mark 10M.
First, as shown in FIGS. 6 and 7, the arc portion 10 has a concave groove 13 for accommodating the elastic seal ring 2 extending from one arc end to the other arc end. The width of the concave groove 13 is substantially equal to or slightly wider than the width of the elastic seal ring 2, and is formed to a depth that allows the elastic seal ring 2 to be fitted.

A pair of bulging portions 13A in which the flange portion side bulges toward the inner side of the groove is formed on each side wall facing the groove 13 in a point-symmetric manner. The point-symmetric reference point is basically the center point in the width direction and the axial direction of the arc portion 10, but an appropriate reference point is set depending on the design error, the structure of the groove, and other configurations. can do. Due to the presence of the bulging portion 13 </ b> A, the elastic seal ring 2 is fitted into the concave groove 13 with a predetermined angle with the axial center of the arc portion 10 of the joint segment 1. Here, in consideration of the fact that the general joint segment 1 is manufactured as a casting, the bulging portion 13A is preferably non-bulged on the side wall of the groove to improve the removal of the groove 13 portion from the mold. in continuous wall manner from the portion 13B, more preferably formed in a smooth continuous surface. Further, by forming this way a continuous wall, the or a smooth continuous surface, when the pay resilient seal ring 2 in the groove 13, and elastically deformed along the side wall of the groove 11, concave The elastic seal ring 2 is supported by the entire groove wall. Therefore, the elastic seal ring 2 is not partially supported and accommodated in an unstable concave groove, and stress is not locally applied by partial support. Therefore, the form of the bulging portion 13A is preferable from the viewpoint of durability of the elastic seal ring.

On the other hand, on both sides of the concave groove 13, there are ridges 14 and 14 erected in the radial direction of the arc portion 10. These ridges 14, 14 are formed along the arc of the arc portion 10, and when the tube ends of the tubes 50 , 50 to be connected are accommodated in the arc portion 10, the circumferential grooves 51, 51 of the respective tubes. Each is located within. The separation distance between the ridges 14 and 14 is arbitrarily selected in consideration of the separation distance between the circumferential groove 51 and the pipe end. In addition, this convex strip part 14 and 14 is an unnecessary structure, when setting it as the joint segment which connects the pipes which do not have a circumferential groove | channel.

  Further, the elastic seal ring 2 accommodated in the concave groove 13 has an annular piece 2A extending to the inner peripheral side substantially at the center between its both end faces as shown in FIG. The annular piece 2A has a length that protrudes axially from the inner peripheral surface of the arc portion 10 in a state of being accommodated in the concave groove 13, and is positioned between the tube end surfaces of the tube 50 when the tube 50 is connected. Is done. The elastic seal ring 2 has a groove portion 2B between the annular piece 2A and the opening edges at both ends, and performs a so-called lip seal function. In particular, in the elastic seal ring 2 of this embodiment, both ends of the groove 2B have tongue pieces 2C formed so that the fringes slightly return in the direction of the annular piece, and by the pressure of the fluid flowing through the groove 2B When the groove width is expanded, the tongue portion 2C is configured to be pressed against the outer surface of the tube, and a more favorable sealing effect is achieved. Here, the elastic seal ring 2 is held in a state where at least the axis of the annular piece 2A and the axis of the circular arc part 10 are displaced in a non-parallel manner by the bulging parts 13 and 13 as described above.

  Further, an L-shaped ridge 15 arranged in an L shape from one end in the axial direction of the arc portion end and an L shape continuously formed from the L-shaped ridge 15 to the other end in the axial direction of the arc portion 10. It has a mold defect 16. The L-shaped chipped portion 16 is chipped in substantially the same shape as the L-shaped projecting ridge 15, and is formed in the L-shaped projecting ridge 15 formed in one joint segment 1 and the other joint segment. In addition, a seal stamp coupling is formed by fitting the L-shaped defect portion 16 together.

And the housing type pipe joint H of this preferable form of this form mentioned above is the said bolt 3 in the state which bridge | crosslinked the bolt 3 and 3 to the bolt insertion hole 21 and 21 between a pair of joint segments 1 and 1 which face. in the temporary bonding state of relative 3 just fitted with a nut 4, 4, the bolt insertion holes 21, 21 can afford for the screw portion of the bolt 3, also a pair of coupling segments 1,1 each other As shown in FIG. 9, it is in a relatively rotatable state while maintaining the torsional relationship.

  Therefore, in the housing-in-type pipe joint H of this embodiment, the annular piece 2A protruding from the inner peripheral surface of the arc portion 10 is formed by the manner of holding the elastic seal ring 2 in the concave groove by the bulging portions 13 and 13 described above. When the pipe end surfaces of the pipes 50 and 50 to be connected are brought into contact with each other, the joint segments 1 and 1 are displaced from the pipe axis L2 as shown in FIG. It becomes a state.

  The housing type pipe joint H according to the present invention has the above-mentioned preferable configuration, and each joint as shown by an arrow in FIG. 9 as the curvature radius of the arc portion 10 is reduced by tightening the nut 4 to the bolt 3. When the segments 1 and 1 are rotated in the opposite direction and the mark 10M substantially contacts the outer surface of the tube, the protrusion 14 is pressed against the distal end side wall 51A of the circumferential groove 51 of the tube and the rotation is completed. It is comprised so that it may become a position, ie, a fastening completion position.

  Thereby, as described above, the pipes are reliably connected and fixed by the protruding strip portion 14 regardless of the presence or absence of an error in the diameter of the pipe or an error in the depth of the circumferential groove, and at the fastening completion position, If it is designed so that there is a gap between the ridge 14 and the proximal end side wall of the circumferential groove 51, the movement of the pipes to be separated is allowed while the movement of the pipes to be allowed is allowed. In this state, both pipe ends are connected while being sealed. Further, once the tubes are separated from each other, the tubes can be moved closer to each other thereafter. Furthermore, the tubes are connected to each other in a state where a certain amount of movement on the distal end side of the tubes is allowed. Therefore, the pipe joint of the present invention can connect the pipes while ensuring the expansion and contraction flexibility of the pipe line.

  In addition, the specific relationship between the rotation amount of the joint segment 1 and the position of the mark 10M is appropriately designed according to the pipe diameter of the pipe to be connected, the shape of the ridges 14, the rotation mechanism, and the like. Further, in the example shown in FIG. 10, as a preferable example, at a position where the axis of the arc portion 10 and the tube axis L2 are parallel or coaxial, the mark 10M coincides with the outer surface of the tube 50 to complete the fastening. However, this is not the case.

  Here, when the rotation mechanism of the joint segment 1 in the housing type pipe joint H of this embodiment is exemplified, the rotation mechanism disclosed in Japanese Patent Application Laid-Open No. 2008-019976 (Patent Document 3) and Japanese Patent Application Laid-Open No. 2008-019975 (Patent Document 4). Can be adopted. More specifically, (1) by tightening the nut 4 to the bolt 3, the bolts 3 are guided and moved by the bolt insertion holes 21 so that the bolt shafts are parallel to each other. A mechanism in which the nut 4 presses the edge of the bolt insertion hole 21 or the vicinity thereof to apply a rotational force to the joint segments 1, 1, and (2) a guide convex portion that promotes rotation is provided on the flange portion 20 facing the bolt 3. A structure in which the guide convex portion functions and rotates according to the approach between the flanges by tightening the nut 4 with respect to the joint, and (3) a joint segment as the L-shaped convex portion and the L-shaped defective portion are fitted to each other. The structure which has a guide function so that can be rotated can be illustrated. Of course, other known rotation mechanisms can be employed, and a plurality of rotation mechanisms can be used in combination.

<How to use>
Next, a method of using the housing type pipe joint H of this embodiment will be described.
The housing type pipe joint H according to the present embodiment has a structure in which the pair of joint segments 1 and 1 are temporarily connected with bolts 3 and 3 and nuts 4 and 4 while holding the elastic seal ring 2 in the groove 13. It can be in a combined state. This temporarily connected state is a state in which the pair of joint segments 1 and 1 are connected to each other by the bolts 3 and 3 and the nuts 4 and 4 but the facing flange portions 20 and 20 are close to each other.

In connecting the pipes 50, 50, first, the pipe ends of the pipes 50, 50 to be connected are attached to the annular piece 2A of the elastic seal ring 2 held by the joint segments 1, 1 that are temporarily joined. The housing-type pipe joint H is temporarily installed so that the pipe end face is brought into contact with the protruding strip 14 being positioned in the circumferential groove 51 formed in the pipe end. The fact that the tube end surface is in contact with the annular piece 2A can be easily detected with a sense other than vision, such as the feel and sound at that time.

  If the housing-type pipe joint H is temporarily installed at the pipe end, the nuts 4 and 4 are then tightened to the bolts 3 and 3 so that the flanges 20 and 20 of the joint segments 1 and 1 are brought close to each other. At this time, as understood from FIG. 3, first, as the joint segments 1 and 1 approach each other, the arc central portion 10 s of the arc portions 10 and 10 or a portion including the vicinity thereof abuts the outer surface of the pipe 50, Thereafter, the arc segment 10 is bent from the arc segment central portion 10 s of the joint segment 1, 1 toward the flange portion 20 side so that the arc edge 10 </ b> E is close to the outer surface of the pipe 50. , 10 has a smaller radius of curvature.

Then, as the nuts 4 and 4 are tightened, the joint segments 1 and 1 are rotated in the opposite direction as the flange portions 20 and 20 approach each other, thereby causing the L-shaped ridges 15 and 15 to face each other. The character-shaped missing portions 16 and 16 start to be fitted.

And when the site | part corresponding to the said mark 10M formed in the joint segment 1 and 1 contact | connects the outer surface of the pipe | tube 50, the L-shaped convex ridge 15 and the L-shaped defect | deletion part 16 which faced are completely fitted. As a result, the rotation of the joint segments 1 and 1 facing each other is restricted, and the ridge 14 is pressed against the distal end side wall 51A of the circumferential groove 51 to complete the fastening.

  As described above, the housing type pipe joint H of the present embodiment can be temporarily installed at an appropriate position between the pipe ends without disassembling the housing, and it is possible to reduce the fastening work and connect the pipes reliably. The end position of the fastening can be confirmed by matching the outer surface of the 10M pipe 50, and even if there is an error in the depth of the circumferential groove of the pipe to be connected, both pipes can be securely connected and fixed. It becomes possible.

  INDUSTRIAL APPLICABILITY The present invention can be used in the field of connecting various fluid pipes such as water pipes, gas pipes and plant pipes while keeping them in a sealed state.

  DESCRIPTION OF SYMBOLS 1 ... Joint segment, 2 ... Elastic seal ring, 2A ... Ring piece, 2B ... Groove part, 2C ... Tongue piece part, 3 ... Bolt, 4 ... Nut, 10 ... Arc part, 10E ... Arc part edge, 10e ... Arc part End edge part, 10M ... mark, 10c ... arc center, 10s ... arc center part, L1 ... perpendicular line from arc center to the center of arc part (arc part center), 11 ... notch part, 11a ... notch base point, 11b: Notch base point, 13: recessed groove, 13A: bulged portion, 13B: non-bulged portion, 14: convex strip portion, 15 ... L-shaped convex portion, 16 ... L-shaped defective portion, 20 ... flange Part 21, bolt insertion hole 50, pipe 51, circumferential groove 51 A circumferential pipe distal side wall L 2 pipe axis H housing type pipe joint

Claims (7)

A housing-type pipe joint that connects pipes facing each other,
A fastening means for fastening the pair of joint segments, the elastic seal ring, and the pair of joint segments;
The joint segment has an arc portion, a flange portion extending from both ends of the arc portion, and a concave groove formed on the inner peripheral surface of the arc portion and into which the elastic seal ring is fitted.
By bending between the flanges of both joint segments by means of the fastening means, the radius of curvature of the arc portion is reduced, and the bending causes the peripheral edge of the arc portion to coincide with the outer surface of the pipe to be connected. in the housing form fitting configured to coupled is completed,
It has a mark on the peripheral edge of the arc portion, and is configured so that the connection between the tubes is completed when a portion of the peripheral edge of the arc portion corresponding to the mark contacts the outer surface of the pipe Housing type pipe joint.   The housing-type pipe joint according to claim 1, wherein the mark is provided at both arc ends of the circumferential edge of the arc portion.   3. The housing-type pipe joint according to claim 1, wherein the mark is located at a position of 15 to 60 degrees with respect to a perpendicular line from the arc center of the arc portion to the center of the arc portion.   The joint segment has a circular arc portion peripheral edge cut out in a predetermined range starting from both flange portions side ends, and the end of the cut out portion is the mark. The housing type pipe joint described in 1. The housing shape fitting is for connecting and fixing the tubes each having a circumferential groove in the pipe end portion,
The joint segment has a ridge portion located in the circumferential groove on the inner peripheral surface of the arc portion,
And each joint segment is rotated in the opposite direction with the approach between the facing flanges by the fastening means,
5. Any one of claims 1 to 4, wherein when the portion of the circumferential edge of the arc portion corresponding to the mark comes into contact with the outer surface of the tube by this rotation, the protruding portion is pressed against the distal end side wall of the circumferential groove. The housing type pipe joint according to claim 1. The elastic seal ring has an annular piece extending between the pipe end faces of the pipes to be connected, extending to the inner peripheral side, and the axis of the annular piece is not parallel to the axis of the joint segment The housing-type pipe joint according to claim 5, wherein the housing-type pipe joint is fitted in the groove in advance. The arcuate outer peripheral arc end portion has a stepped portion comprising an L-shaped projecting ridge and an L-shaped missing portion formed continuously with the L-shaped projecting ridge, and between the facing flanges by the connecting means The L-shaped projecting ridge and the L-shaped defect portion facing each other as the joint approaches and the joint segment rotates are fitted into each other, and when the mark is substantially in contact with the outer surface of the pipe, they are completely fitted together. The housing-type pipe joint according to claim 4 or 5, which forms a stamped joint for restricting movement of the housing.

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