JP2016008630A - Flexible pipe with joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible pipe including a joint in which a pipe joint is assembled into the flexible pipe through its simple structure.SOLUTION: A flexible pipe 10 including a joint in accordance with this invention has a pipe joint 15 assembled into an end part of a flexible pipe 11. More practically, the pipe joint 15 includes an inner sleeve 20 extending from a bellows part 12 of the flexible pipe 11 toward a front side becoming a side of a pipe 90 and an outer sleeve 30 having the inner sleeve 20 inserted and passed through inside of it so as to form an annular clearance 15K receiving the pipe 90, and a rear end part of the outer sleeve 30 is provided with an engaging protrusion part 31 engaged with an annular engaging groove 25 formed at an outer circumferential part of the flexible pipe 11.

Description

  The present invention relates to a flexible pipe with a joint in which a pipe joint is incorporated at an end of the flexible pipe.

  Conventionally, as a pipe joint, a one-touch pipe joint that has a double cylinder structure and is connected to a pipe inserted between an inner cylinder and an outer cylinder is known (for example, see Patent Document 1). A form in which this one-touch pipe joint is assembled to an end of a flexible pipe is also known. Specifically, this assembly has been performed by screwing the end of the pipe joint on the flexible pipe side into a cap nut attached to the flexible pipe.

JP 2010-101475 A ([0029], FIG. 2)

  However, the form in which the joint is assembled to the flexible pipe described above has a problem that it is necessary to form a threaded portion in the pipe joint or to attach a cap nut to the flexible pipe, which takes time.

  An object of the present invention is to provide a joint with a flexible pipe in which a pipe joint is incorporated into a flexible pipe with a simple structure.

  A flexible pipe with a joint according to the invention of claim 1 made to achieve the above object is a flexible pipe with a joint in which a pipe joint connected to the pipe is incorporated at an end of a flexible pipe having a bellows portion, The pipe joint includes an inner sleeve that extends from the bellows portion of the flexible pipe to the front side, which is the pipe side, and an outer sleeve that is inserted into the inner sleeve to form an annular gap that receives the pipe between the inner sleeve and the inner sleeve. And the rear end portion of the outer sleeve is characterized in that it is provided with an engaging protrusion that protrudes inward and engages with an annular engaging groove formed in the outer peripheral portion of the flexible tube.

  According to a second aspect of the present invention, in the flexible pipe with a joint according to the first aspect, the annular engagement groove is formed in the outer peripheral portion of the inner sleeve, and the outer sleeve is a sleeve body loosely fitted with the inner sleeve; A base ring that has a C-ring shape with a part cut off in the circumferential direction and that has an engagement protrusion on the inside and is attached to the annular engagement groove, and is open to the sleeve body. The joint recess is formed, and the base ring is provided with a locking claw that is inserted from the rear side into the sleeve main body and engages with the engagement recess.

  According to a third aspect of the present invention, in the flexible pipe with a joint according to the second aspect, a guide groove extending in an axial direction from the rear end of the sleeve body and communicating with the engagement recess is formed on the inner peripheral surface of the sleeve body. A locking claw that is disposed on both sides in the circumferential direction of the groove and is inserted into the sleeve body from the rear side and a stepped portion that can be contacted are formed, and the stepped portion is directed to the front side as it approaches the guide groove in the circumferential direction. It is characterized by an inclined slope.

  According to a fourth aspect of the present invention, in the flexible pipe with a joint according to any one of the first to third aspects, the inner sleeve is received in the O-ring groove in which the O-ring is mounted and the annular gap. A retaining ring groove to which a retaining ring for retaining the pipe is attached is formed in order from the front side, and an insertion packing is provided to cover the O ring from the outside in the annular gap, and the outer sleeve is arranged in front of the O ring groove. It is characterized in that a lateral claw projecting inward and extending in the circumferential direction of the outer sleeve is provided in the portion to be provided.

  The invention according to claim 5 is the flexible pipe with joint according to claim 4, wherein the front end portion of the outer sleeve is formed with slits extending in the axial direction at a plurality of locations in the circumferential direction. It is characterized by being formed in an arcuate body sandwiched between them.

  According to a sixth aspect of the present invention, in the flexible pipe with a joint according to the fifth aspect, the lateral claws are formed on a part of the plurality of arc bodies, and a part of the plurality of arc bodies is used. The arcuate body is characterized in that it is provided with vertical claws protruding inward and extending in the axial direction of the outer sleeve.

  A flexible pipe with a joint according to the invention of claim 7 is a flexible pipe with a joint in which a pipe joint connected to the pipe is incorporated in an end portion of the flexible pipe having a bellows portion, and the flexible pipe is connected to the pipe side from the bellows portion. An inner sleeve extended to the front side is formed, and an O-ring and a retaining ring are externally fitted to the inner sleeve, and the inner sleeve is inserted into the inner sleeve so that an annular gap is received between the inner sleeve and the inner sleeve. It is characterized by having an outer sleeve to be formed.

[Invention of Claim 1]
According to the first aspect of the present invention, the engagement protrusion of the outer sleeve is engaged with the annular engagement groove of the inner sleeve while the inner sleeve extending from the bellows portion of the flexible tube is inserted through the outer sleeve from the rear side. Thus, a pipe joint is formed in which the pipe is received in the annular gap between the inner sleeve and the outer sleeve and connected to the pipe. As described above, according to the present invention, the pipe joint can be incorporated into the flexible pipe simply by engaging the engagement protrusion of the outer sleeve with the annular engagement groove of the inner sleeve. In this connection structure, it is not necessary to form a screw part or use a cap nut, and it is possible to easily configure a pipe joint on the flexible pipe.

[Invention of claim 2]
According to the invention of claim 2, in a state where the base ring is attached from the side to the annular engagement groove formed on the outer peripheral surface of the inner sleeve, the inner sleeve is inserted through the sleeve body from the rear side, The outer sleeve is assembled to the inner sleeve by engaging the locking claw with the engaging recess of the sleeve body. Thus, according to the present invention, it is possible to easily attach the outer sleeve to the inner sleeve.

[Invention of claim 3]
According to the invention of claim 3, when the locking claw is inserted into the sleeve body from the rear side, the locking claw is slidably brought into contact with the slope of the step portion to be guided to the guide groove, and the guide groove is guided. Thus, the locking claw can be engaged with the engaging recess.

[Invention of claim 4]
In the invention of claim 4, when the pipe is inserted into the annular gap between the outer sleeve and the inner sleeve, the pipe smoothly passes the outside of the O-ring by the action of the insertion packing that covers the O-ring in the initial state. . Here, if the pipe that has passed through the O-ring is pulled out and can be inserted again, the insertion packing pushed to the back does not cover the O-ring. Is likely to fall out of the O-ring groove. If the pipe is inserted in a state where the O-ring is removed from the O-ring groove, the sealing performance is deteriorated. On the other hand, in the present invention, even if an attempt is made to pull out the pipe before the pipe passes outside the retaining ring, it is difficult to remove the pipe by the lateral claws, so it becomes difficult to reinsert the pipe once inserted. , It is suppressed that the O-ring is connected to the pipe in a state where the O-ring is dropped from the O-ring groove. Thereby, the fall of sealing performance is suppressed.

[Invention of claim 5]
According to the invention of claim 5, since the front end portion of the outer sleeve is divided into the plurality of arcuate bodies by the slits extending in the axial direction, the front end portion of the outer sleeve is expanded in the radial direction, and the outer sleeve and the inner sleeve It is possible to easily insert the pipe between the two.

[Invention of claim 6]
According to the sixth aspect of the present invention, it is possible to prevent the pipe from being pulled out by suppressing the rotation of the pipe with respect to the outer sleeve.

[Invention of Claim 7]
According to the seventh aspect of the present invention, the pipe that is connected to the pipe by receiving the pipe in the annular gap between the inner sleeve and the outer sleeve by inserting the outer sleeve through the inner sleeve extending from the bellows portion of the flexible pipe. A joint is formed. As described above, according to the present invention, since the pipe joint can be incorporated into the flexible pipe by inserting the outer sleeve through the inner sleeve, the screw portion is provided as in the conventional connecting structure of the flexible pipe and the pipe joint. It is no longer necessary to form a cap nut or use a cap nut, and a pipe joint can be easily formed on a flexible pipe.

The perspective view of the flexible pipe with a joint concerning a 1st embodiment of the present invention. Side sectional view of the joint part of the flexible pipe with joint Exploded perspective view of flexible pipe with joint (A) perspective view of base ring, (B) plan view (A) AA sectional view of base ring, (B) BB sectional view (A) perspective view, (B) plan view of sleeve body (A) Perspective view of sleeve body viewed from below, (B) Bottom view (A) CC sectional view of the sleeve body, (B) DD sectional view Enlarged plan view around the vertical nail in the sleeve body Side sectional view of the joint part of a flexible pipe with a joint in the state of being connected to a pipe Side sectional view of the joint part of the flexible pipe with joint according to the second embodiment (A) Side view of outer sleeve, (B) Side sectional view Side sectional view of the joint part of the flexible pipe with joint according to the third embodiment (A) Side view of outer sleeve, (B) Side sectional view

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the flexible pipe 10 with a joint according to this embodiment has a structure in which a pipe joint 15 is incorporated in an end portion of the flexible pipe 11. The flexible tube 11 is formed by drawing a metal tube (for example, a SUS tube), and has a bellows portion 12 that communicates with the pipe joint 15 in a bellows shape in which irregularities are alternately repeated in the axial direction. In the example shown in FIG. 1, the end of the bellows portion 12 opposite to the pipe joint 15 is fixed to the connection flange 13. The connection flange 13 is formed with a female screw hole (not shown) communicating with the flexible tube 11 so that a pipe (not shown) and the flexible tube 11 can be connected. In the following, the pipe joint 15 side is referred to as the front side of the joint-attached flexible pipe 10, and the connection flange 13 side is referred to as the rear side of the joint-attached flexible pipe 10.

  As shown in FIG. 2, the flexible tube 11 has an inner sleeve 20 that extends linearly from the bellows portion 12 to the front side. An O-ring groove 22, a retaining ring groove 23, and an annular engagement groove 25 are formed on the outer peripheral portion of the inner sleeve 20 in order from the front side.

  The O-ring groove 22 is disposed at the front end portion of the inner sleeve 20 and is formed over the entire circumferential direction. An O-ring 16 is attached to the O-ring groove 22 from the outside.

  The retaining ring groove 23 is formed over the entire circumferential direction of the inner sleeve 20, and the groove depth becomes shallower toward the front side. Specifically, the retaining ring groove 23 is formed as follows. That is, a small diameter portion 24 is provided in a portion of the inner sleeve 20 sandwiched between the O-ring groove 22 and the annular engagement groove 25, and the small diameter portion 24 is tapered so as to decrease in diameter toward the rear side. Thus, the retaining ring groove 23 is formed.

  A retaining ring 17 is attached to the retaining ring groove 23 from the outside. The retaining ring 17 has a C-ring shape that is partly cut off in the circumferential direction and can be elastically expanded and contracted in the radial direction, and includes a plurality of sharpened portions 17A on the outer circumferential portion. The sharpened portion 17A slightly protrudes from the retaining ring groove 23 when the retaining ring 17 is attached to the rear end portion of the retaining ring 23, that is, the portion having the deepest groove depth. In the example shown in FIG. 2, the retaining ring 17 includes two sharp portions 17 </ b> A arranged in the axial direction.

  The annular engagement groove 25 is disposed at the rear end portion of the inner sleeve 20 and is formed over the entire circumferential direction. A base ring 50 (see FIG. 3) described later is attached to the annular engagement groove 25 from the outside.

  As shown in FIG. 1, the flexible pipe 10 with a joint according to the present embodiment includes an outer sleeve 30 outside the inner sleeve 20. The inner sleeve 20 and the outer sleeve 30 constitute the pipe joint 15 described above. Hereinafter, the outer sleeve 30 will be described.

  As shown in FIG. 3, the outer sleeve 30 includes a sleeve body 40 and a base ring 50. As shown in FIG. 4A, the base ring 50 has a C-ring shape in which a part in the circumferential direction of the circle is cut, and specifically, a flange portion 51 having a notch 50K, and a flange portion 51. And an upright wall 54 erected from the center position.

  As shown in FIG. 4B, constricted portions 51A having a reduced radial length are provided at a plurality of locations in the circumferential direction of the flange portion 51. Then, between the constricted portions 51A and 51A in the flange portion 51, between the notch portion 50K and the constricted portion 51A, an outer projecting piece 53 projecting outward from the upright wall 54, and projecting inward from the standing wall 54 An inner projecting piece 52 is formed (see FIG. 5B).

  As shown in FIG. 4 (A), the standing wall 54 has a notch portion that cuts the standing wall 54 in the axial direction of the base ring 50 on both sides of the plurality of constricted portions 51A among the plural constricted portions 51A described above. 54K, 54K. The standing wall 54 is a portion of the flange portion 51 excluding the plurality of constricted portions 51A, and the first standing portion 54A located between the notches 54K and 54K on the some constricted portions 51A. It is divided into a plurality of second upstanding portions 54B located above. As shown in FIG. 5A, the first upright portion 54A has a protruding height from the flange portion 51 larger than that of the second upright portion 54B, and protrudes outward from the tip portion away from the flange portion 51. The locking claw 55 is provided.

  In detail, as shown in FIG. 4B, the constricted portion 51A is arranged at a position facing the notch 50K in the flange portion 51 and a position shifted from the notch 50K by about 90 degrees in the circumferential direction. Has been. The first upstanding portion 54A is disposed on the pair of constricted portions 51A and 51A facing each other with a shift of about 90 degrees from the notch 50K.

  Next, the sleeve body 40 will be described. As shown in FIG. 3, the entire sleeve body 40 has a straight cylindrical shape, and its outer diameter is substantially the same as the outer diameter of the base ring 50. Further, as shown in FIG. 2, the inner diameter of the sleeve body 40 is large enough to allow the inner sleeve 20 of the flexible tube 11 to be inserted.

  As shown in FIG. 1 and FIG. 6 (A), the rear end portion (the lower end portion in FIG. 6 (A)) of the sleeve body 40 disposed on the connection flange 13 side of the flexible tube 11 has a diameter. A plurality of engagement holes 41 penetrating in the direction are formed, and the “engagement recess” according to the present invention is formed by the engagement holes 41. Further, slits 42 extending linearly in the axial direction from the front end of the sleeve main body 40 are formed at a plurality of locations in the circumferential direction at the front end of the sleeve main body 40 (the upper end in FIG. 6A). . The front end portion of the sleeve main body 40 is divided into a plurality of arcuate bodies 43 by a plurality of slits 42.

  As shown in FIG. 6B, the arcuate body 43 is formed with a lateral claw 44 that protrudes inward and extends in the circumferential direction. As shown in FIG. 8B, the horizontal claw 44 has a stepped portion 44 </ b> D that protrudes in a stepped manner from the inner peripheral surface of the sleeve body 40. Moreover, the surface which faces the inner side of the horizontal nail | claw 44 becomes the inclined surface 44K which goes outside as it goes to the front side (upper side of FIG. 8 (B)). The surface facing the front side of the arcuate body 43 is curved so as to go to the rear side as it goes inward, and communicates with the inclined surface 44K of the lateral claw 44.

  In the present embodiment, as shown in FIG. 6 (B), the lateral claws 44 are formed in a part of the plurality of arc bodies 43 among the plurality of arc bodies 43, and the remaining arc bodies 43 protrude inward and A vertical claw 45 extending linearly in the axial direction is provided. Here, when the circular arc body in which the horizontal claws 44 are formed is referred to as a first circular arc body 43A, and the circular arc body 43 in which the vertical claws 45 are formed is referred to as a second circular arc body 43B, the first arc A plurality of bodies 43A and second arc bodies 43B are provided alternately in the circumferential direction (for example, three each).

  As shown in FIG. 9, the vertical claws 45 are disposed at both ends in the circumferential direction of the second arcuate body 43B. Further, the vertical claws 45 have a triangular shape in which the protruding amount increases toward the outer side in the circumferential direction of the second arcuate body 43B. Note that the vertical claw 45 has a stepped portion 45D that protrudes in a stepped manner from the inner peripheral surface of the sleeve main body 40, similar to the horizontal claw 44 (see FIG. 8A).

  As shown in FIG. 7A, a guide groove 46 that extends in the axial direction from the rear end of the sleeve body 40 and communicates with the engagement hole 41 is formed on the inner peripheral surface of the sleeve body 40. Further, a stepped portion 47 extending in the circumferential direction is formed on both sides of the inner circumferential surface of the sleeve body 40 in the circumferential direction of the guide groove 46, and a portion disposed behind the stepped portion 47 is stepped. The diameter has been expanded. The stepped portion 47 is provided with a slope 47 </ b> S that inclines toward the front side as it approaches the engagement hole 41.

  Specifically, as shown in FIG. 7B, the engagement holes 41 are arranged in pairs on a straight line passing through the center of the sleeve body 40, and the guide grooves 46 correspond to the respective engagement holes 41. Is provided. Further, the stepped portion 47 is formed in the entire portion of the inner peripheral surface of the sleeve body 40 where the guide groove 46 is not formed, and specifically, one guide groove 46 of the pair of guide grooves 46. The first step portion 47A is disposed on both sides of the second guide groove 46, and the second step portion 47B is disposed on both sides of the other guide groove 46. The first and second stepped portions 47A and 47B are provided with a pair of slopes 47S and 47S on both sides of the guide groove 46, respectively. In FIG. 7B, the portion corresponding to the rear surface (bottom surface) of the sleeve body 40 is shown in gray.

  Next, assembly of the outer sleeve 30 to the inner sleeve 20 will be described. In order to assemble the outer sleeve 30 to the inner sleeve 20, first, the base ring 50 is attached to the annular engagement groove 25 of the inner sleeve 20. Specifically, the base ring 50 is elastically deformed so that both sides of the notch 50K are separated in the circumferential direction, and the inner sleeve 20 is inserted into the notch 50K from the radial direction. At this time, the standing wall 54 of the base ring 50 is disposed so as to extend from the flange portion 51 to the front side of the inner sleeve 20. Further, the inner projecting piece 52 of the flange portion 51 protrudes into the annular engagement groove 25, and the base ring 50 is prevented from coming off from the inner sleeve 20 in the axial direction. In detail, the base ring 50 is rotatably attached to the inner sleeve 20.

  Next, the inner sleeve 20 is inserted through the sleeve body 40 from the rear side. At this time, the standing wall 54 of the base ring 50 is inserted into the sleeve main body 40 together with the inner sleeve 20, and the locking claw 55 formed on the first standing portion 54 </ b> A is engaged with the engagement hole 41 of the sleeve main body 40. Match. At this time, even if the locking claw 55 is in a circumferential position shifted from the guide groove 46, the locking claw 55 comes into contact with the stepped portion 47 formed on the inner peripheral surface of the sleeve main body 40. The locking claw 55 is slidably brought into contact with the slope 47 </ b> S of the stepped portion 47 and guided to the guide groove 46, and is guided to the engagement hole 41 by the guide groove 46.

  As described above, the sleeve body 40 and the base ring 50 are integrated to form the outer sleeve 30, and the outer sleeve 30 is assembled to the inner sleeve 20. Here, the O-ring 16, the retaining ring 17, and the insertion packing 18 are attached to the inner sleeve 20 in advance, and the pipe joint 15 is completed by assembling the outer sleeve 30 to the inner sleeve 20.

  Thus, according to the present embodiment, the inner sleeve 20 is attached to the sleeve body 40 from the rear side with the base ring 50 attached to the annular engagement groove 25 formed on the outer peripheral surface of the inner sleeve 20 from the side. The outer sleeve 30 is assembled to the inner sleeve 20 by inserting the engaging claw 55 of the base ring 50 into the engaging hole 41 of the sleeve main body 40. As described above, according to the present embodiment, the outer sleeve 30 can be easily assembled to the inner sleeve 20.

  In addition, when the locking claw 55 is inserted into the sleeve body 40 from the rear side, the locking claw 55 is slidably brought into contact with the slope 47S of the stepped portion 47 formed on the inner peripheral surface of the sleeve body 40 to guide the groove. 46, and the engaging claw 55 can be engaged with the engaging hole 41 by using the guide groove 46 as a guide.

  In the present embodiment, the inner projecting piece 52 of the base ring 50 forms the engagement protrusion 31 according to the present invention, and the engagement hole 41 of the sleeve body 40 corresponds to the “engagement recess” of the present invention. To do.

  As shown in FIG. 10, for example, a resin pipe 90 is connected to the pipe joint 15 of the flexible pipe 10 with a joint. This connection is performed as follows. That is, as shown in FIG. 2, first, the pipe 90 is inserted into the annular gap 15 </ b> A formed between the inner sleeve 20 and the outer sleeve 30 from the front side of the pipe joint 15. Here, since the front end portion of the outer sleeve 30 (sleeve body 40) is divided into a plurality of arcuate bodies 43 by the slits 41 extending in the axial direction, the front end portion of the outer sleeve 30 is expanded in the radial direction, and the outer sleeve The pipe 90 can be easily inserted between the inner sleeve 30 and the inner sleeve 20.

  When the pipe 90 is inserted into the annular gap 15A, the tip of the pipe 90 comes into contact with the insertion packing 18 and pushes the insertion packing 18 backward. At this time, the insertion packing 18 moves to the rear side while pressing the O-ring 16 into the O-ring groove 22, so that the O-ring 16 is prevented from falling off from the O-ring groove 22. It becomes possible to increase the adhesiveness.

  After passing through the outside of the O-ring 16, the pipe 90 is inserted until it passes through the outside of the retaining ring 17. In this state, even if the pipe 90 is pulled out, the sharpened portion 17A of the retaining ring 17 bites into the inside of the pipe 90 and the retaining ring 17 is expanded in diameter by the tapered portion 24, so that the pipe 90 is prevented from coming off. In this state, the insertion packing 18 abuts against the rear end portion of the outer sleeve 30, that is, the base ring 50.

  Here, if the pipe 90 is pulled out until the pipe 90 passes the outside of the O-ring 16 and reaches the retaining ring 17, the insertion packing 18 passes through the O-ring. In such a state, if the pipe 90 is reinserted, there is a high possibility that the O-ring 16 will fall out of the O-ring groove 22 due to friction with the pipe 90. Therefore, if it is possible to pull out the pipe 90 and insert it again, there is a high possibility that the pipe 90 will be inserted in a state where the O-ring 16 has fallen out of the O-ring groove 22, and the sealing performance will be reduced. Invite. On the other hand, in this embodiment, even if the pipe 90 is pulled out before the pipe 90 passes the outside of the retaining ring 27, the pipe 90 is not easily pulled out by the lateral claws 44 provided on the arcuate body 43 of the outer sleeve 30. Therefore, it becomes difficult to re-insert the pipe 90 once inserted, and it is possible to prevent the pipe 90 from being connected in a state where the O-ring 16 is dropped from the O-ring groove 22. Thereby, the fall of sealing performance is suppressed.

  In the configuration having only the lateral claws 44, when the pipe 90 is pulled out while being rotated, the lateral claws 44 can only cut a spiral groove on the outer peripheral surface of the pipe 90 and the pipe 90 cannot be prevented from coming off. There is. For this reason, it is necessary to prevent the pipe 90 from rotating with respect to the outer sleeve 30, but in the present embodiment, the second arcuate body 43A of the outer sleeve 30 where the lateral claws 44 are not provided extends in the axial direction. Since the vertical claws 55 are provided, the rotation of the pipe 90 relative to the outer sleeve 30 can be suppressed, and the pipe 90 can be made difficult to come off.

  By the way, in order to facilitate the assembly of the outer sleeve 30 to the inner sleeve 20, instead of providing the annular engagement groove 25 at the rear end portion of the inner sleeve 20, a male screw portion is formed to engage the outer sleeve 30. It is conceivable to use a structure in which a female screw portion is formed instead of providing the portion 31. In such a configuration, the outer sleeve 30 can be configured by one component without being configured by two components of the sleeve body 40 and the base ring 50. However, as described above, the flexible tube 11 is formed by drawing a metal tube, so that the metal tube needs to be thin. For this reason, it is difficult to form a male screw portion on the outer peripheral surface of the metal tube, and it is difficult to achieve the configuration. Thus, the configuration of the present embodiment is particularly useful when connecting the flexible pipe 11 that is a processed product of a thin metal pipe and the pipe 90.

  The description regarding the structure of the flexible pipe 10 with a joint of this embodiment is above. Next, the effect of the flexible pipe 10 with a joint is demonstrated.

  In the present embodiment, the inner sleeve 20 extending linearly from the bellows portion 12 of the flexible tube 11 is inserted into the outer sleeve 30 from the rear side, and the engagement of the outer sleeve 30 with the annular engagement groove 25 of the inner sleeve 20 is performed. A pipe joint that receives the pipe 90 in the annular gap 15 </ b> A between the inner sleeve and the outer sleeve 30 and connects to the pipe 90 by engaging the stop protrusion 31 (the inner projecting piece 52 of the base ring 50). 15 is formed. As described above, according to the present embodiment, the flexible pipe 11 and the pipe joint 15 can be connected only by engaging the engagement protrusion 31 of the outer sleeve 30 with the annular engagement groove 25 of the inner sleeve 20. Thus, unlike the conventional connecting structure of a flexible pipe and a pipe joint, there is no need to form a screw portion or use a cap nut, and the pipe joint 15 can be easily configured on the flexible pipe 11.

  Moreover, in the present embodiment, the inner sleeve 20 is inserted into the sleeve body 40 from the rear side in a state where the base ring 50 is attached from the side to the annular engagement groove 25 formed on the outer peripheral surface of the inner sleeve 20. Since the outer sleeve 30 is assembled to the inner sleeve 20 by engaging the engaging claw of the base ring 50 with the engagement hole 41 of the sleeve body 40, the outer sleeve 30 can be easily assembled to the inner sleeve 20. Is possible.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. The present embodiment is a modification of the first embodiment, and the configuration of the outer sleeve is mainly different. Specifically, as shown in FIG. 11, the flexible pipe with joint 10 </ b> V of the present embodiment includes the same flexible pipe 11 as that of the first embodiment and the outer sleeve 30 </ b> V, and the inner sleeve 20 of the flexible pipe 11. And the outer sleeve 30V form a pipe joint 15 similar to that of the first embodiment. Hereinafter, as in the first embodiment, the pipe joint 15 side of the flexible pipe 11 is referred to as a front side, and the opposite side of the pipe joint 15 is referred to as a rear side.

  As shown in FIG. 12A, the outer sleeve 30 </ b> V includes a straight tube portion 60 and a reduced diameter taper portion 61 that decreases in diameter from the rear end portion of the straight tube portion 60 toward the rear side. Like the sleeve main body 40 of the first embodiment, a plurality of slits 42 are formed at the front end portion of the straight cylindrical portion 60, and the first arcuate body 43 </ b> A of the arcuate bodies 43 sandwiched between the slits 42 and 42. The horizontal claw 44 extends in the circumferential direction, and the second arcuate body 43B is provided with the vertical claw 45 extending in the axial direction (see FIG. 12B).

  An engagement claw 62 protruding inward is provided at the rear end portion of the reduced diameter taper portion 61. The engaging claws 62 are arranged at a plurality of locations (for example, 4 locations) in the circumferential direction. The plurality of engagement claws 62 are formed by, for example, outer caulking and are engaged with the annular engagement groove 25. In other words, in the present embodiment, the engagement protrusions 31 </ b> V according to the present invention are formed by the engagement claws 62. The inner diameter of the front end portion of the reduced diameter taper portion 61 is smaller than the inner diameter of the straight tube portion 60, and the inner peripheral surface of the outer sleeve 30 </ b> V is stepped at the boundary portion between the straight tube portion 60 and the reduced diameter taper portion 61. The diameter is reduced.

  This completes the description of the configuration of the outer sleeve 30V. About the other structure of flexible pipe 10V with a joint, since it is the same as that of 1st Embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol. According to this embodiment, the same effect as the first embodiment can be obtained.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. The present embodiment is a modification of the second embodiment, and the configuration of the outer sleeve is mainly different. Specifically, as illustrated in FIG. 13, the flexible pipe with joint 10 </ b> W of the present embodiment includes the flexible pipe 11 similar to that of the first embodiment and the outer sleeve 30 </ b> W, and the inner sleeve 20 of the flexible pipe 11. And the pipe joint 15 similar to the said 1st Embodiment is formed by the outer sleeve 30W. Hereinafter, as in the first embodiment, the pipe joint 15 side of the flexible pipe 11 is referred to as a front side, and the opposite side of the pipe joint 15 is referred to as a rear side.

  As shown in FIG. 14A, the entire outer sleeve 30W has a straight cylindrical shape, and has a plurality of slits 42 at the front end, similar to the sleeve main body 40 of the first embodiment. Of the arcuate body 43 sandwiched between the slits 42, 42, the first arcuate body 43A has a lateral claw 44 extending in the circumferential direction, and the second arcuate body 43B extends in the axial direction. Vertical claws 45 are provided (see FIG. 14B).

  As shown in FIG. 14 (B), engagement claws 72 extending rearward and bent inward are provided at a plurality of locations in the circumferential direction of the rear end portion of the outer sleeve 30W. Further, a stepped portion 73 is provided on the inner peripheral surface of the outer sleeve 30 </ b> W that is located slightly in front of the engaging claw 72, and the diameter of the rear side is increased stepwise. The stepped portion 73 and the bent portion 72 </ b> A of the engaging claw 72 are opposed to each other in the axial direction, and a receiving recess 74 is formed between the stepped portion 73 and the engaging claw 72.

  As shown in FIG. 13, the receiving recess 74 of the outer sleeve 30W receives the first peak portion 75A on the foremost side (the side closest to the inner sleeve 20) of the bellows portion 12 of the flexible tube 11. Further, the bent portion 72A of the engaging claw 72 is engaged with the first valley portion 76A between the second peak portion 75B and the first peak portion 75A, which is one rear side of the first peak portion 75A. The outer sleeve 30W is assembled to the flexible tube 11.

  Thus, in this embodiment, the engagement protrusion 31W according to the present invention is formed by the engagement claw 72, and the “annular engagement groove” of the present invention is formed by the first valley portion 76A of the bellows portion 12. Yes. In the present embodiment, the front side portion of the first peak portion 75A of the bellows portion 12 has a tapered shape with a reduced diameter on the front side, and the outer peripheral portion of the first peak portion 75A can contact the stepped portion 73. It has become.

  About the other structure of flexible pipe 10W with a joint, since it is the same as that of 1st Embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol. According to this embodiment, the same effect as the first embodiment can be obtained.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various modifications are possible within the scope of the invention other than the following. It can be changed and implemented.

  (1) In the first embodiment, the “engagement recess” according to the present invention is formed by the engagement hole 41 that penetrates the sleeve body 40 in the radial direction. May be.

  (2) In the first embodiment, the stepped portion 47 having the slope 47S is provided on the inner peripheral surface of the sleeve main body 40. However, the stepped portion 47 may not be provided. Even with such a configuration, it is possible to align the positions of the engaging claws 55 of the base ring 50 and the guide grooves 46 with the position of the engaging hole 41 as a clue. In the configuration (1), if a mark is provided on the outer peripheral portion at the position where the engaging recess is formed, the locking claw 55 and the guide groove 46 can be aligned using the mark as a clue. .

  (3) In the above embodiment, the horizontal claw 44 and the vertical claw 45 are provided on the arcuate body 43 of the outer sleeve 30. However, only the horizontal claw 44 may be provided. At this time, the position of the lateral claw 44 may be shifted in the axial direction for each arc 43.

  (4) In the above embodiment, the bellows portion 12 of the flexible pipe 11 is fixed to the connection flange 13 on the side opposite to the pipe joint 15, but for example, it may be fixed to a pipe joint having a threaded portion on the outer peripheral surface. Good.

  (5) In the first embodiment, two locking claws 55 are provided on the base ring 50, but three or more locking claws 55 may be provided. At that time, the locking claw 55 may not be disposed on the constricted portion 51 </ b> A of the flange portion 51.

10, 10V, 10W Joint-equipped flexible tube 11 Flexible tube 20 Inner sleeve 25 Annular engagement groove 30, 30V, 30W Outer sleeve 31, 31V, 31W Engagement protrusion 40 Sleeve body 41 Engagement hole (engagement recess)
44 Horizontal claw 45 Vertical claw 46 Guide groove 47 Stepped portion 47S Slope 50 Base ring 52 Inner projecting piece 76A First trough (annular engagement groove)

Claims (7)

A pipe joint connected to a pipe is a flexible pipe with a joint incorporated at the end of the flexible pipe having a bellows portion,
The pipe joint is
An inner sleeve extending from the bellows portion of the flexible tube to the front side which is the pipe side;
The inner sleeve is inserted inside, and an outer sleeve that forms an annular gap for receiving the pipe between the inner sleeve, and
A flexible pipe with a joint, characterized in that a rear end portion of the outer sleeve is provided with an engaging protrusion that protrudes inward and engages with an annular engaging groove formed in an outer peripheral portion of the flexible pipe. . The annular engagement groove is formed on the outer periphery of the inner sleeve,
The outer sleeve has a sleeve body loosely fitted with the inner sleeve, a C-ring shape with a part of the circumference of the circle cut off, and has the engagement protrusion on the inside, and is formed in the annular engagement groove. And a base ring to be attached,
The sleeve body is formed with an engagement recess that opens to the inside, and the base ring is provided with a locking claw that is inserted from the rear side inside the sleeve body and engages with the engagement recess. The flexible pipe with a joint according to claim 1, wherein the flexible pipe has a joint. A guide groove extending in an axial direction from a rear end of the sleeve body and communicating with the engagement recess is disposed on an inner peripheral surface of the sleeve body, and is disposed on both sides in the circumferential direction of the guide groove so as to be rearward of the sleeve body. A stepped portion is formed that can come into contact with the locking claw inserted from
The flexible pipe with a joint according to claim 2, wherein a slope that slopes toward the front side as the guide groove is approached in the circumferential direction is provided in the stepped portion. In the inner sleeve, an O-ring groove in which an O-ring is attached and a retaining ring groove in which a retaining ring for retaining the pipe received in the annular gap is formed in order from the front side, and the annular gap An insertion packing for covering the O-ring from the outside is provided,
The lateral claw that protrudes inward and extends in the circumferential direction of the outer sleeve is provided at a portion of the outer sleeve that is disposed in front of the O-ring groove. A flexible pipe with a joint according to claim 1. In the front end portion of the outer sleeve, slits extending in the axial direction at a plurality of locations in the circumferential direction are formed,
The flexible pipe with a joint according to claim 4, wherein the lateral claws are formed in an arcuate body sandwiched between the slits. The horizontal claw is formed on a part of the plurality of circular arc bodies,
The arcuate body excluding the partial arcuate body among the plurality of arcuate bodies is provided with vertical claws protruding inward and extending in the axial direction of the outer sleeve. Flexible pipe with fittings. A pipe joint connected to a pipe is a flexible pipe with a joint incorporated at the end of the flexible pipe having a bellows portion,
Forming an inner sleeve extending from the bellows portion to the front side which is the pipe side in the flexible tube, and externally fitting an O-ring and a retaining ring to the inner sleeve;
A flexible pipe with a joint, characterized in that an inner sleeve is inserted inside and an outer sleeve is formed that forms an annular gap for receiving the pipe between the inner sleeve and the inner sleeve.