JP5030494B2 - Housing type pipe fitting - Google Patents

Description

  The present invention relates to a housing-type pipe joint used for sealing the butted ends of a pair of pipes.

Conventionally, as this type of housing-type pipe joint 100H, as shown in FIG. 7, the pipe ends of pipes 50 and 50 having circumferential grooves 151 and 151 at the pipe ends are concentrically abutted to each other, and an annular shape is formed at the joint. After externally fitting the elastic ring 102, a pair of substantially semicircular joint segments 101, 101 are formed on the inner peripheral surface of the pipe end portion via the elastic ring 102, and locking pieces 113, 113 are formed. From the bolts 103 and 103 and the nuts 104 and 104 to the bolt insertion holes 121 and 121 provided in the flange portions 120 and 120 of the joint segments 101 and 101 facing each other so as to be fitted in the circumferential grooves 150 and 150. The two pipes are integrally connected by screwing a connecting tool.
When mounting such housing-type pipe joints 101, 101, the bolts 103, 103 and nuts 104, 104 are once removed from the flange portions 120, 120 of the joint segments 101, 101, and the annular elastic ring 102 is joined. Then, the joint segments 101 and 101 are fitted on the elastic 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 opposed to each other. The nuts 104 and 104 are screwed together through the bolt insertion holes 121 and 121 of the flange portions 120 and 120, respectively.
JP-A-11-241793 JP-A-11-241794

However, this conventional housing-type pipe joint 100H requires a complicated operation of fitting the elastic ring 102 and the circumferential grooves 151 and 151 to an appropriate position of the pipe while visually confirming the position. When the bolts 103 and 103 are inserted into the bolt insertion holes 121 and 121, if the nuts 104 and 104 are screwed together when the bolts 103 and 103 are inserted from the upper side in the vertical direction, it is difficult to perform the installation with a tightening tool (not shown). The bolts 104, 104 are inserted into the bolt insertion holes 121, 121 from the lower side in the direction, and the nuts 104, 104 are screwed together while being supported by hand to prevent the bolts 103, 103 from dropping, and the workability is very high. It was bad.
Further, in the conventional housing-type pipe joint 100H, the locking pieces 113, 113 provided on the joint segments 101, 101 must be brought into pressure contact with the bottoms of the circumferential grooves 151, 151 provided on the pipes at their tips. However, even if the dimensions of the pressing part such as the height (depth) of the locking piece are set correctly, there are many errors in the diameter of the tubes even if the nominal diameters of the tubes 150 and 150 used are the same. Therefore, due to the difference in the depth of the circumferential groove of the tube, a difference occurs in the pressure contact force of the tube by the locking pieces 113 and 113, and the fixing of the tubes 150 and 150 by the locking pieces 113 and 113 is weakened. Sometimes the ends of the tubes could not be securely connected.
Therefore, the main problem of the present invention is that it is possible to easily install the housings at appropriate positions between the pipe ends without disassembling the pipes, making the operation of connecting the pipes extremely simple and connecting them. It is an object of the present invention to provide a housing-type pipe joint capable of reliably connecting and fixing both pipes even if there is an error in the depth of the circumferential groove of the power pipe.

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 for connecting pipes having circumferential grooves at the pipe ends,
The housing-type pipe joint includes a pair of joint segments, an annular elastic ring that seals between pipe ends, and a bolt and a nut that substantially couple the joint segments,
The joint segment includes a substantially arc-shaped arc portion in which both pipe end portions are accommodated, a flange extending outward from the arc portion end, and an inner circumferential surface of the arc portion from one arc end to the other arc end. A groove formed so as to extend, a range of less than 90 degrees in the circumferential direction from one arc portion end of one side wall of the groove, and less than 90 degrees in the circumferential direction from the other arc end of the other side wall Protrusions formed in each of the ranges, and locking pieces erected in the radial direction of the arc portion on both sides of the groove,
The flange has a bolt insertion hole through which the bolt is inserted,
The elastic ring has an annular piece extending to the inner peripheral side, and is supported between the protrusions so that the annular piece is not parallel to a reference line connecting the centers of the bolt insertion holes at both ends. It is accommodated in the groove as it is made,
One of the locking pieces on both sides of the groove is: one of the surfaces standing on the side of the groove, and the circumferential direction from the end of one circular arc portion of the outer wall surface that is located outward from the groove The distal end of the circumferential groove of one tube in a range of less than 90 degrees at a distance from the tube end of the other tube butted against the one tube and connected by the housing-type fitting Having a pressing part abutted on the side wall;
The other locking piece of the locking pieces on both sides of the groove is: from the other arcuate end of the outer wall surface, which is a surface positioned outward from the groove, of the surfaces rising on the side of the groove. In the range of less than 90 degrees in the direction, the far side wall of the circumferential groove of the other pipe is a side wall at a position far from the pipe end of the one pipe that is abutted with the other pipe and connected by the housing-type fitting. A pressing portion that is in contact with the lateral end side wall;
By tightening the nut on the bolt, each joint segment is rotated in the opposite direction until the respective reference line forms a predetermined angle with respect to a plane perpendicular to the pipe axis or is parallel to each other, and each reference line is When each of the predetermined angle with respect to the surface or parallel to the surface, the pressing portion is brought into contact with the distal end side wall of the circumferential groove to complete the connection of each pipe, The inner wall surface, which is the side wall surface close to the groove, out of the surfaces standing on the sides of the groove of the both locking pieces, and the locking piece side wall surface so that there is a gap between the circumferential groove and the side wall surface. A housing-type pipe joint characterized in that an angle with the reference line is determined.

(Function and effect)
In the housing type pipe joint of the present invention, the elastic ring held in the housing has an annular piece. Since this annular deformation extends to the inner peripheral side of the elastic ring, the pipe end face can be brought into contact with both sides of the annular piece (both ends of the elastic ring), and the housing pipe joint can be obtained without visual confirmation. The elastic ring can be reliably positioned at a desired position.
In addition, since the elastic ring is supported in the concave groove of the joint segment, when the pipe end face is brought into contact with both sides of the annular piece (both ends of the elastic ring), the joint segment is interposed between the pipe end parts. Since it is positioned, preparation for tightening can be completed very easily.
On the other hand, in the housing type pipe joint of the present invention, the locking piece on one side of the locking pieces on both sides of the concave groove has a circumferential groove in a range of less than 90 degrees in the circumferential direction from the other arc portion end of the outer wall surface. has a pressing portion that contacts the distal end side wall, the locking piece on the other side, those in the range of less than 90 degrees from one arc portion end of the outer wall surface in the circumferential direction to the distal end side wall of the circumferential groove It has a pressing part to be in contact.
These pressing portions are rotated in opposite directions by tightening the nuts with respect to the bolts until the respective joint segments form a predetermined angle with respect to the plane perpendicular to the pipe axis or are parallel to each other. When the reference lines become a predetermined angle or parallel to each other, they are brought into contact with the respective side walls of the circumferential groove. Therefore, in the housing type pipe joint of the present invention, since the pressing part is finally brought into contact with the side wall of the distal end instead of the bottom part of the circumferential groove of the pipe, the pipes are connected and fixed. The pipes are securely connected and fixed regardless of whether there is an error in the depth of the circumferential groove.
On the other hand, the housing-type pipe joint according to the present invention has the circumferential groove of the side wall standing up from the inner wall surface of the locking piece and the groove bottom of the circumferential groove when the pressing portion is in contact with the distal end side wall. Since there is a gap between the proximal end side wall, which is a side wall close to the pipe end of the pipe that is abutted with and connected by the housing-type pipe joint, the movement of the pipes to be controlled is restricted. On the other hand, both ends of the pipes are connected while being sealed in a state in which 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.
Further, in the housing type pipe joint of the present invention, the elastic ring is held by tilting the annular piece by the protrusion formed on the side wall of the groove, so that the pipe end faces abut both sides of the annular piece. The installation preparation can be completed in a state before the predetermined angle or parallelism is achieved.
Here, in the housing-type pipe joint of the present invention, the protrusion supporting the elastic ring in the concave groove is moved in the elastic ring existence direction with the rotation of the joint segment. In the housing, since the ring is elastic and the annular piece is positioned between the pipe ends, the protrusion is only pushed into the elastic ring, and the presence of the elastic ring does not hinder the movement of the protrusion. The rotation of the elastic ring is not restricted, and the elastic ring is not twisted by the rotation of the joint segment.
If both wall surfaces of the locking piece, at least the outer wall surface, are not parallel to the reference line, each pressing portion can be brought into contact with the side wall of the circumferential groove with a smaller rotation angle of the joint segment. , Enabling even faster coupling.
Further, if the elastic 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 ring Even if the pipe is not always contacted with pressure, the width of the groove is expanded between the annular piece and the opening edges at both ends when necessary, so that the sealing function is exhibited. Small and highly durable housing type pipe joint.

<Invention of Claim 2>
When each reference line makes a predetermined angle with respect to the surface perpendicular to the tube axis or parallel to each other, the inner wall surface of the locking piece and the surface perpendicular to the tube axis are parallel to each other. The housing fitting according to claim 1, wherein

(Function and effect)
When each reference line makes a predetermined angle with respect to the surface perpendicular to the tube axis or parallel to each other, the inner wall surface of the locking piece and the surface perpendicular to the tube axis are parallel to each other. Therefore, the tubes can be connected to each other in a state in which the movement of the distal end side in the up / down / left / right direction is allowed, thereby improving the flexibility of the conduit.

<Invention of Claim 3>
An L-shaped projecting ridge arranged in an L-shape on the end surface of the arc portion and an L-shaped chipped portion continuously formed on the L-shaped projecting ridge are formed between the facing flanges by the bolts and nuts. When the L-shaped projecting ridge and the L-shaped chipped portion facing each other with the approach and rotation of the segment joint are fitted, and the reference line forms a predetermined angle with respect to the plane perpendicular to the tube axis The housing-type pipe joint according to claim 1, wherein the housing-type pipe joint is formed so as to fit completely when parallel and to form a stamped joint that restricts movement of each other.

(Function and effect)
The housing-type pipe joint according to the present invention includes an L-shaped projecting ridge arranged in an L-shape when the reference line forms a predetermined angle with respect to a plane perpendicular to the pipe axis or parallel to the surface. Since the L-shaped dimple formed continuously on the L-shaped convex ridge fits completely and forms a stamped joint that restricts the movement of each other, the joint segment does not over-rotate, and the housing type The pipe joint can be set securely at a desired position, and the twisting of the elastic ring, breakage of the locking piece, and breakage of the pipe accompanying excessive rotation are prevented.

<Invention of Claim 4>
The housing-type pipe joint according to any one of claims 1 to 3, wherein the housing-type pipe joint bends so that the radius of curvature of the arc portion of the joint segment becomes smaller as the bolt and nut approach the flanges of both joint segments.

(Function and effect)
The housing-type pipe joint of the present invention has a wide radius of curvature before tightening with bolts and nuts, so that the pipe end is easy to insert into the housing. In addition, the housing-type pipe joint can be contacted over a wide range of the pipe circumference because the curvature radius is bent in accordance with the proximity between the flanges by tightening the bolt and nut.

  The specific operational effects of the invention described in the claims are as described above. However, the housing-type pipe joint of the present invention can be installed in an appropriate position between the pipe ends without disassembling the housing once. It is possible to easily connect the pipes, and even if there is an error in the depth of the circumferential groove of the pipes to be connected, both pipes can be connected securely. . 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.

  Next, embodiments of the present invention will be described in detail below with reference to the drawings (FIGS. 1 to 6). 1 is a front view of a housing-type pipe joint according to this embodiment before tightening, FIG. 2 is a partially sectional side view before tightening, and FIG. 3 is a partially sectional plan view showing an internal structure before tightening. 4 is a front view after tightening of the housing type pipe joint of the present embodiment, FIG. 5 is a partially cutaway side view after tightening, and FIG. 6 is a partially sectional plan view showing the internal structure after tightening.

  The housing-type pipe joint H of this embodiment includes a pair of joint segments 1 and 1, an annular elastic ring 2, and bolts 3 a and 3 b and nuts 4 a and 4 b that substantially couple the joint segments 1 and 1 to each other. . 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 includes a substantially arc-shaped arc portion 10 in which ends of the pipes 50 and 50 facing each other are accommodated, and flanges 20 and 20 extending outward from the end of the arc portion 10. Bolt insertion holes 21a and 21b for inserting the bolts are formed in the flange. The bolt insertion holes 21a and 21b are formed as elliptical elongated holes whose major axis is the arc portion axial direction X1 of the joint segment 1. The short axis direction is also formed with a width having an appropriate margin with respect to the threaded portion of the inserted bolt, so that the bolts 3a and 3b can be loosely inserted into the bolt insertion holes 21a and 21b.

  The circular arc part 10 is formed in advance with a radius of curvature slightly larger than the pipe diameter of the pipe 50 to be connected, so that the pipe end 50 to be connected can be positioned in the circular arc part 10 easily and reliably. Composed. As will be described later, the arc portion 10 is bent by tightening the nuts 4a and 4b with respect to the bolts 3a and 3b via the flange 20, and the radius of curvature thereof is slightly reduced. It is comprised so that the site | part contact | abutted to the outer surface of a pipe | tube may be increased.

  A concave groove 11 for accommodating the elastic ring is formed on the inner peripheral surface of the arc portion 10 so as to extend from one arc end to the other arc end. The width of the concave groove 11 is slightly wider than the width of the elastic ring 2 and is formed to a depth at which the elastic ring 2 can be fitted.

  Here, the joint segment 1 of the present embodiment is characteristically formed with protrusions 12 and 12 on the side wall of the groove 11. This protrusion is formed so as to extend from the upper edge of the groove 11 toward the bottom of the groove, and has a shape in which a trapezoidal cone is cut in half.

  The protrusions 12 and 12 are each within a range of less than 90 degrees in the circumferential direction from one arc portion end of the side wall of the concave groove 11 and a range of less than 90 degrees in the circumferential direction from the other arc end of the other side wall. Is formed. These protrusions 12, 12 hold the elastic ring 2 and hold it in the groove 11.

  Further, the joint segment 1 of the present embodiment has locking pieces 13 and 13 erected in the radial direction of the arc portion 10 on both sides of the concave groove 11. These locking pieces 13, 13 have arcuate ends along the arc of the arc portion 10, and when the pipe ends 50, 50 are accommodated in the arc portion 10, in the circumferential grooves 51, 51 of the respective tubes. Are located at positions separated by an appropriate distance on both sides of the concave groove 11. The separation distance between the locking pieces 13 and 13 is arbitrarily selected in consideration of the separation distance between the circumferential groove 51 and the pipe end.

Moreover, each locking piece 13 and 13 on the both sides of the concave groove 11 has a press part contact | abutted to the side wall of a circumferential groove, respectively. More specifically, the locking piece 13 on one side has a pressing portion 13a that is in contact with the distal end side wall 51A of the circumferential groove in a range of less than 90 degrees in the circumferential direction from the other arc portion end of the outer wall surface. a locking piece 13 of the other side, the range of the arc portion end in the circumferential direction less than 90 degrees one of the outer wall, having a pressing portion 13a which is brought into contact with the distal end side wall 51B of the circumferential groove. In addition, a more suitable form is the convex part continuously formed in the range to 45 degree | times in the circumferential direction from each arc part edge with each press part.

  On the other hand, the elastic ring 2 accommodated in the concave groove 11 has an annular piece 2A extending to the inner peripheral side at the approximate center between its both end faces. The annular piece 2 </ b> A has a length protruding from the inner peripheral surface of the arc portion 10 toward the axial center side in a state of being accommodated in the concave groove 11. The elastic ring 2 has a groove 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 ring 2 of this embodiment, both ends of the groove portion 2B have tongue piece portions 2C formed so that the fringes slightly return in the annular piece direction, and the pressure of the fluid flowing through the groove portion 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 ring 2 is supported by the projections 12 and 12 so that the annular piece 2A is not parallel to the reference line L1 connecting the centers of the bolt insertion holes 21a and 21b at both ends. And is accommodated in the concave groove 11. More specifically, the elastic ring 2 is supported by the presence of the protrusions 12 and 12 in a state where the surface formed by any three points on the inner peripheral surface of the annular piece 2A and the reference line L1 do not intersect at right angles. Has been.

  On the other hand, the joint segment 1 of this embodiment has an L-shaped projecting ridge 14 arranged in an L shape from one end in the axial direction of the arc portion end and the other end in the axial direction of the arc portion 10 from the L-shaped projecting ridge 14. Have an L-shaped defect 15 formed continuously. The L-shaped defect 15 is lacking in the shape of the L-shaped projecting ridge 14, and the L-shaped projecting ridge 14 formed on one joint segment 1 and the L-shaped formed on the other joint segment 2. An imprint joint is formed by fitting the mold defect portion 15.

  Here, the housing-type pipe joint 1 of the present invention has the bolts 3, 3 in a state where the bolts 3, 3 are bridged to the bolt insertion holes 21a, 21a, 21b, 21b between the pair of facing joint segments 1, 1. On the other hand, in the temporarily coupled state in which only the nuts 4 and 4 are attached, the bolt insertion holes 21a, 21a, 21b, and 21b have a margin with respect to the screw portion 3m of the bolt 3, so that the pair of joint segments 1 , 1 are in a state in which their reference lines L1, L1 are relatively rotatable while maintaining a twisted relationship.

  In this embodiment, the elastic ring 2 is accommodated in the concave groove 11 in a state where the elastic ring 2 is inclined with respect to the reference line L1 by the protrusions 12 and 12, and therefore the annular piece 2A protruding from the inner peripheral surface of the arc portion 10. 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 2 do not have the reference line L1 parallel to the plane F perpendicular to the pipe axis L2.

  Here, the surface F perpendicular to the tube axis L2 in the present invention and the present specification is a virtual surface assumed to be perpendicular to the tube axis, and does not constitute the housing H or the tube 50. Absent. However, since the pipe end face of the pipe is normally configured to be perpendicular to the pipe axis, the pipe end face can be used as a reference in construction except for special cases.

  Then, the joint segment 1 of the present invention is configured so that each of the joint segments 1 and 1 is not in parallel with the plane F perpendicular to the pipe axis L2 by tightening the nut 4 with respect to the bolt 3. In this embodiment, the rotation is performed in the opposite direction, and the rotation is performed by the guide function of the bolt insertion holes 21a and 21b.

  As shown in the illustrated example, the joint segment 1 of this embodiment has bolt insertion holes 21a, 21a, 21b, and 21b of the flanges 20 and 20 facing when the reference lines L1 and L1 of the joint segments 1 and 1 are in a torsional relationship. When the bolt 3 is bridged between the bolt insertion holes 21a and 21b in such a state, the both-end bolt shafts L3 and L3 are also in a twisted relationship. When the nut 4 is fastened to the bolt 3 from this state, the bolt 3 is guided and moved by the bolt insertion holes 21a and 21b so that the bolt shafts L3 and L3 are parallel to each other, and the bolt 3 and the nut 4 are The edge of the bolt insertion holes 21a and 21b or the vicinity thereof is pressed to apply a rotational force to the joint segments 1 and 1.

  As another joint segment rotating mechanism, for example, a guide convex portion that promotes rotation may be provided on the facing flange, and the guide convex portion may function in accordance with the approach between the flanges by tightening the nut with respect to the bolt. Further, the L-shaped convex part and the L-shaped missing part may be configured to have a guide function so that the joint segment is rotated as they are fitted. Furthermore, it is possible to adopt a configuration in which these guide mechanisms and the above-described guide mechanism using bolts are used in combination.

  As shown in the illustrated example, when the reference pipe L1 is rotated until the reference line L1 becomes parallel to a plane F perpendicular to the pipe axis L2, the housing-type pipe joint H of this embodiment has each pressing portion 13a on the distal end side wall 51B. In this case, the inner wall surface 13B of the locking piece 13 on which the pressing portion 13a of the locking piece is not formed is formed in the circumferential groove. It is comprised so that it may be in the state spaced apart from the proximal end side wall 51B. Preferably, the inner wall surface 13B is configured to be parallel to a plane F perpendicular to the tube axis L2. The configuration of the locking piece 13 is achieved by appropriately selecting the angle between the inner and outer wall surfaces of the locking piece 13 and the reference line L1 and the protruding length of the pressing portions 13 and 13 in consideration of the circumferential groove width 51. it can.

  On the other side, the L-shaped projecting ridge 14 and the L-shaped chipped portion 15 that are facing each other are fitted with the rotation of the joint segments 1 and 1, and the reference lines L1 and L1 are perpendicular to the tube axis L2. When a predetermined angle is formed with respect to the flat surface F or when it is parallel to the flat surface F, it is completely fitted and an imprint coupling that restricts movement of each other is formed.

<How to use pipe fittings>
Next, a method of using the housing type pipe joint H of this embodiment will be described.
Due to its structure, the housing type pipe joint H of the present embodiment is temporarily coupled with a pair of joint segments 1 and 1 with bolts 3 and 3 and nuts 4 and 4 while holding the elastic ring 2 in the concave groove 11. 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 flanges 20 and 20 are close to each other.

  In connecting the pipes 50 and 50, first, as shown in FIGS. 1 to 3, the pipe ends of the pipes 50 and 50 to be connected are held by the joint segments 1 and 1 that are temporarily joined. The pipe end face is brought into contact with the annular piece 2A of the elastic ring 2, and the housing type pipe joint H is temporarily installed so that the locking piece 13 is positioned in the circumferential groove 51 formed in the pipe end. To do. 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.

  At this time, in the housing type pipe joint H of this embodiment, the annular piece 2A is accommodated in the concave groove 11 so as to be non-parallel to the reference line L1 connecting the centers of the bolt insertion holes 21a and 21b at both ends. Therefore, when the annular piece 2A is in contact with the pipe end surface as described above, the reference lines L1 and L1 of the joint segments 1 and 1 are parallel to the plane F perpendicular to the pipe axis L2. Not inclined. In addition, there is a margin between the bolt insertion holes 21a and 21b and the screw portions 3m and 3m of the bolts 3 and 3, and the pair of joint segments 1 and 1 maintain their twisted relationship with their reference lines L1 and L1. However, it becomes a relatively rotatable state.

  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, the arc portions 10 and 10 of the joint segments 1 and 1 are bent, and the radius of curvature of the arc portions 10 and 10 is reduced. As is apparent from the front view shown in FIG. 1, the joint segments 1 and 1 of the present embodiment are particularly formed with the flanges 20 and 20 integrally formed with a slight acute angle with respect to the arc portions 10 and 10. The flanges 20 and 20 that face each other when bent so that the radii of curvature of the portions 10 and 10 become smaller are substantially perpendicular to the ends of the arc portions 10 and 10. Due to such bending, the portions near the flanges 20 and 20 of the arc portions 10 and 10 are moved so as to be close to the outer surface of the pipe, and the locking pieces 13 and 13 of the portions are moved so as to enter into the circumferential grooves 51 and 51. .

  Furthermore, with the approach between the flanges 20, 20 accompanying the tightening of the nuts 4, 4, the joint segments 1, 1 are rotated in the opposite direction, thereby facing the L-shaped ridges 14, 14. The deficient portions 15 and 15 start to be fitted. And when both the reference lines L1 and L1 of the joint segments 1 and 1 reach parallel to the plane F perpendicular to the tube axis L2, the L-shaped projecting ridge 14 and the L-shaped defect 15 Are completely fitted to form a stamped joint, and the rotation of the joint segments 1 and 1 facing each other is restricted.

  When the stamped joint between the L-shaped projecting ridge 14 and the L-shaped missing portion 15 is formed in this way, the pressing portion 13 a contacts the distal end side wall 51 </ b> A of the circumferential groove 51. At this time, at least the inner wall surface 13B where the pressing portion of the locking piece 13 is not formed and the proximal end side wall 51B are separated from each other. This embodiment is a particularly suitable example, and the inner wall surface 13B of the locking piece 13 is parallel to a surface that is F with respect to the tube axis L2. In this state, the tubes can move so that their tube end surfaces are separated from each other, approach after the movement, and further bend with displacement of the tube axis of each tube.

  As is apparent from the above description, the housing type pipe joint H of this embodiment can be temporarily installed at an appropriate position between the pipe ends without disassembling the housing, and the pipe end faces of the pipes can be easily connected with each other with a very simple operation. The pipes can be connected in a state in which the pipes can be moved apart from each other, approached after the movement, and further bendable with a deviation of the pipe axis of each pipe. .

  Note that the line-to-line twist and the line-to-surface perpendicular in the present invention are not strictly interpreted in a mathematical sense, and if the accuracy is within an allowable range in normal construction in this technical field. It is enough.

  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.

It is a front view before the fastening of the housing type pipe joint of the present invention. It is a partial cross section side view before the fastening of the housing type pipe joint of this invention. It is a partial cross section top view which shows the internal structure before clamping 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 partial cutaway side view after the fastening of the housing type pipe joint of the present invention. It is a partial cross section top view which shows the internal structure after the clamp | tightening of the housing type pipe joint of this invention. It is explanatory drawing of the conventional housing type pipe joint.

  DESCRIPTION OF SYMBOLS 1 ... Joint segment, 2 ... Elastic ring, 2A ... Ring piece, 2B ... Groove part, 2C ... Tongue piece part, 3 ... Bolt, 3m ... Screw part, 4 ... Nut, 10 ... Arc part, 20 ... Flange, 21a, 21b DESCRIPTION OF SYMBOLS ... Bolt insertion hole, 11 ... Groove, 12 ... Projection part, 13 ... Locking piece, 13a ... Pressing part, 13B ... Locking piece inner side wall, 14 ... L-shaped convex part, 15 ... L-shaped defect part, DESCRIPTION OF SYMBOLS 16 ... Edge piece, 50 ... Pipe, 51 ... Circumferential groove, 51A ... Circumferential groove side wall (distal end side), 51B ... Circumferential groove side wall (proximal end side), L1 ... Center of bolt insertion hole of joint segment Lines connecting them (reference line), L2 ... tube axis, L3 ... bolt axis, X1 ... circular axis direction, H ... housing type pipe joint.

Claims (4)

A housing-type pipe joint for connecting pipes having circumferential grooves at the pipe ends,
The housing-type pipe joint includes a pair of joint segments, an annular elastic ring that seals between pipe ends, and a bolt and a nut that substantially couple the joint segments,
The joint segment includes a substantially arc-shaped arc portion in which both pipe end portions are accommodated, a flange extending outward from the arc portion end, and an inner circumferential surface of the arc portion from one arc end to the other arc end. A groove formed so as to extend, a range of less than 90 degrees in the circumferential direction from one arc portion end of one side wall of the groove, and less than 90 degrees in the circumferential direction from the other arc end of the other side wall Protrusions formed in each of the ranges, and locking pieces erected in the radial direction of the arc portion on both sides of the groove,
The flange has a bolt insertion hole through which the bolt is inserted,
The elastic ring has an annular piece extending to the inner peripheral side, and is supported between the protrusions so that the annular piece is not parallel to a reference line connecting the centers of the bolt insertion holes at both ends. It is accommodated in the groove as it is made,
The locking piece on one side of the locking pieces on both sides of the groove is: from the end of the other circular arc portion of the outer wall surface, which is a surface positioned outward from the groove among the surfaces rising on the side of the groove Distal, in the range of less than 90 degrees in the direction, is the side wall of the circumferential groove of one tube that is abutted against said one tube and connected from the tube end of the other tube that is connected by the housing-type fitting Having a pressing part abutted on the end side wall;
Of the locking pieces on both sides of the concave groove, the other side locking piece is: from the end of one circular arc portion of the outer wall surface, which is a surface positioned outward from the concave groove among the surfaces rising on the side of the concave groove In the range of less than 90 degrees in the direction, the far side wall of the circumferential groove of the other pipe is a side wall at a position far from the pipe end of the one pipe that is abutted with the other pipe and connected by the housing-type fitting. A pressing portion that is in contact with the lateral end side wall;
By tightening the nut on the bolt, each joint segment is rotated in the opposite direction until the respective reference line forms a predetermined angle with respect to a plane perpendicular to the pipe axis or is parallel to each other, and each reference line is When each of the predetermined angle with respect to the surface or parallel to the surface, the pressing portion is brought into contact with the distal end side wall of the circumferential groove to complete the connection of each pipe, The inner wall surface, which is the side wall surface close to the groove, out of the surfaces standing on the sides of the groove of the both locking pieces, and the locking piece side wall surface so that there is a gap between the circumferential groove and the side wall surface. A housing-type pipe joint characterized in that an angle with the reference line is determined.   When each reference line makes a predetermined angle with respect to the surface perpendicular to the tube axis or parallel to each other, the inner wall surface of the locking piece and the surface perpendicular to the tube axis are parallel to each other. The housing fitting according to claim 1, wherein   An L-shaped projecting ridge arranged in an L-shape on the end surface of the arc portion and an L-shaped chipped portion continuously formed on the L-shaped projecting ridge are formed between the facing flanges by the bolts and nuts. When the L-shaped projecting ridge and the L-shaped chipped portion facing each other with the approach and rotation of the segment joint are fitted, and the reference line forms a predetermined angle with respect to the plane perpendicular to the tube axis The housing-type pipe joint according to claim 1, wherein the housing-type pipe joint is formed so as to fit completely when parallel and to form a stamped joint that restricts movement of each other.   The housing-type pipe joint according to any one of claims 1 to 3, wherein the housing-type pipe joint bends so that the radius of curvature of the arc portion of the joint segment becomes smaller as the bolt and nut approach the flanges of both joint segments.

Images