JP2018003980A - Pipe joint - Google Patents

Abstract

[Problem] The sleeve is smoothly deformed in diameter by expanding and contracting the driven ring. [Solution] The sleeve (3) has an engaging portion (31) that engages with the driven ring (4) and is supported so as to be immovable in the tube removal direction, and that disengages from the driven ring (4) as the driven ring (4) is pushed, a linked portion (32) that abuts against a linking portion (43) of the driven ring as the engagement with the engaging portion (31) is released and becomes movable in the tube removal direction by an elastic member (5), and a sliding portion (3) that is movable in the tube removal direction along the tightening member via the driven ring (4) by the elastic member (5) as the linked portion (32) abuts against the linking portion (43) of the driven ring (4). [Selected Figure] Figure 1

Description

  The present invention relates to a pipe joint called a one-push type or a one-touch type that does not require a tool and can be connected by simply inserting a tube body such as a hose or a tube formed of a soft material such as synthetic resin or rubber.

Conventionally, as this type of pipe joint, a cylindrical body having a ring-shaped hole into which a pipe is fitted, a nut-shaped member that forms a tapered surface that expands toward the cylindrical body side, and the above-mentioned inserted into the ring-shaped hole A ring-shaped stopper that presses against the outer periphery of the pipe, a spring that urges the stopper against the tapered surface of the nut-shaped member, and a portion of the inner periphery of the ring-shaped hole that the inner periphery of the pipe hits There is a one-touch joint provided with a seal member to be fitted (see, for example, Patent Document 1).
By inserting the pipe into the ring-shaped hole of the cylindrical body, the inner periphery of the pipe advances while receiving a slight resistance while coming into contact with the seal member. At this time, the outer periphery of the pipe hits the concave / convex shape portion of the metal piece of the stopper, the stopper is moved toward the inner side, and the tapered surface is moved away from the tapered surface of the nut-like member. To do. However, since the stopper is pressed in the opposite direction by the spring, as a result, the stopper does not move, and the tapered surface of the nut-like member and the tapered surface of the stopper are in contact with a constant pressing force. Retained.

Japanese Patent Laid-Open No. 2003-227592

However, in such a conventional pipe joint, the inner periphery of the inserted pipe abuts against the seal member and receives a slight resistance, and at the same time, the concave and convex portion of the stopper whose outer periphery of the pipe is pressed immovably by a spring. Therefore, the insertion of the pipe is not smooth due to a certain resistance. For this reason, there is a possibility that the insertion of the pipe may be stopped halfway depending on the worker due to these resistance forces.
When the pipe body such as a pipe is insufficiently inserted, the end position of the pipe body does not reach the intended insertion position, so the deterioration of the seal member with the secular change and the stopper bite against the surface of the pipe body Even if the decrease in force slightly progresses, the pull-out strength of the tube body is significantly reduced. In this situation, if the fluid pressure (internal pressure) passing through the pipe rises or vibrations such as earthquakes occur, it may cause the pipe to fall out or cause fluid leakage, and the pipe connection cannot be reliably maintained for a long time. There was a problem.
In order to solve such a problem, in Patent Document 1, a viewing hole for detecting the insertion end of the pipe is formed in the vicinity of the bottom of the ring-shaped hole of the cylindrical body, and the insertion position of the pipe is determined by the viewing hole. It can be detected visually.
However, if the tube is inserted by the operator until the tube is inserted to a certain extent and then pulled out, tube insertion after that is often stopped, and visual confirmation from the peephole is not performed. There was also a possibility that insufficient insertion of the tube could not be reliably prevented.
Therefore, it is conceivable to make it mandatory to perform a leak test (leak test) with a fluid such as air after inserting the tube. However, at the initial stage of inserting the tube, the deterioration of the sealing member and the decrease in the biting force of the stopper have not progressed, so there is a possibility that the leak test may pass even if the tube is insufficiently inserted. is there.
Under such circumstances, there is a demand for a pipe joint having a structure that allows the operator to feel the tube insertion insufficient state when the tube insertion is insufficient during the tube insertion operation by the operator. .

  In order to solve such a problem, a pipe joint according to the present invention is provided with a nipple provided to face the inner surface of the pipe body in the radial direction, and provided so as to sandwich the pipe body outside the nipple. A clamping member that presses the inner surface of the tubular body in a radial direction toward the outer peripheral surface of the nipple; and a tube that is reciprocally movable along the clamping member in the tube insertion direction and in the opposite tube withdrawal direction. A sleeve for preventing the diameter of the sleeve from being reduced and deformed in accordance with the movement in the withdrawal direction, and a reciprocation in the tube insertion direction and the tube withdrawal direction opposite to the tube body on the inner side of the sleeve in the tube insertion direction. A driven ring that is movably provided, and an elastic member that is provided so as to bias the driven ring in the tube removal direction, the driven ring being immovable in the tube removal direction with respect to the nipple. Locked And an engaging portion that is released from being engaged with the nipple by being pushed in the tube insertion direction by the tube body, and a linkage portion that removably contacts the sleeve, An engagement portion that engages with the driven ring and is supported so as to be immovable in the tube pull-out direction and that is disengaged from the driven ring as the driven ring is pushed, and the engagement portion Along with the abutment of the interlocked portion of the driven ring that comes into contact with the interlocking portion of the driven ring and can be moved in the tube pull-out direction by the elastic member, and the contact of the linked portion and the interlocking portion of the driven ring The elastic member has a sliding portion that is movable in the tube pull-out direction along the tightening member via the driven ring.

It is a vertical front view which shows the whole structure of the pipe joint which concerns on embodiment of this invention, (a) is a general view at the time of the connection start of a tubular body, (b) is a partial enlarged view. It is a vertical front view which shows the connection middle of a tubular body, (a) is a general view, (b) is a partial enlarged view. It is a vertical front view which shows the connection middle of a tubular body, (a) is a general view, (b) is a partial enlarged view. It is a longitudinal front view which shows the time of completion of connection of a tubular body, (a) is a general view, (b) is a partially enlarged view. It is a disassembled perspective view of a pipe joint.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 5, the pipe joint A according to the embodiment of the present invention inserts the pipe body B into the insertion space S formed between the nipple 1 and the fastening member 2. The tube B is sandwiched between the nipple 1 and the sleeve 3 and is connected and held so that it cannot be pulled out as it is.
More specifically, in the pipe joint A according to the embodiment of the present invention, the nipple 1 provided to face the inner surface B1 of the pipe body B in the radial direction, and the pipe body B (insertion space S) outside the nipple 1 are provided. A clamping member 2 provided so as to be opposed to each other in the radial direction across the pin, and a retaining sleeve provided so as to be capable of reciprocating along the clamping member 2 in the insertion direction of the tube body B and in the reverse direction of the tube body B. 3, a driven ring 4 provided so as to be able to reciprocate in the insertion direction of the tubular body B and the removal direction of the tubular body B on the rear side in the insertion direction of the tubular body B from the sleeve 3, and the tubular body B more than the driven ring 4 An elastic member 5 provided on the back side in the insertion direction is provided as a main component.
Furthermore, it is preferable to include a positioning means 6 that contacts the sleeve 3 and restricts the movement of the sleeve 3 in the insertion direction of the tube B.
The insertion direction of the tube B is hereinafter referred to as “tube insertion direction N”, and the removal direction of the tube B opposite to the tube insertion direction N is hereinafter referred to as “tube removal direction U”.

The tube B is, for example, a hose, a tube, or a pipe made of a hard material, which is formed of a soft material having flexibility such as soft synthetic resin such as vinyl chloride, silicone rubber, or other rubber. As the tubular body B, a tube body having a flat inner surface B1 and an outer surface B3, the distal end surface B2 of which is cut at a substantially vertical or nearly vertical angle is preferable.
In the insertion space S formed between the nipple 1 and the fastening member 2, a connection end Ba having a predetermined length is inserted from the distal end surface B2 of the tube B.
In the example illustrated as a specific example of the tube B, a hose having a single layer structure is used.
Although not shown as another example, a laminated hose in which a plurality or a single synthetic resin blade (reinforcing yarn) is embedded in a spiral as an intermediate layer between the transparent or opaque outer layer and inner layer. (Blade hose), a spiral reinforcing hose (forlan hose) in which a belt-like reinforcing material such as a synthetic resin or metal cross-sectional rectangle and a linear reinforcing material such as a circular cross-section are spirally wound and integrated as an intermediate layer It is also possible to use a spiral reinforcing hose in which a metal wire or a hard synthetic resin wire is embedded in a spiral shape.

The nipple 1 is made of a rigid material such as a metal such as brass or a hard synthetic resin, and is formed in a cylindrical shape having an outer diameter substantially the same as or slightly smaller than the inner diameter of the connection end Ba of the tube body B. . Further, the nipple 1 has a thin wall having an outer diameter that is substantially the same as or slightly smaller than the inner diameter of the tube body B by pressing a plate material made of a deformable rigid material such as stainless steel or other forming process. It is also possible to use what is formed in a cylindrical shape.
The nipple 1 preferably has a locked portion 1b that faces the locking portion 41 of the driven ring 4 described later in the radial direction.
The locked portion 1b is formed on the outer peripheral surface 1a of the nipple 1, and as a specific example of the locked portion 1b, in the example shown in FIGS.
Further, in the illustrated example, the tubular body B inserted into the insertion space S is formed on the outer peripheral surface 1a of the nipple 1 so that the portions on the tube removal direction U side and the tube insertion direction N side are formed in a concave shape with the locked portion 1b interposed therebetween. A gap 1 s is formed between the connecting end portion Ba and the inner surface B1. Thereby, the contact area of the inner surface B1 of the tubular body B with respect to the outer peripheral surface 1a of the nipple 1 is reduced, and the frictional resistance therebetween is reduced. For this reason, the tubular body B can move smoothly along the outer peripheral surface 1 a of the nipple 1.
Although not shown in the drawings as another example, the shape of the locked portion 1b is changed to an annular shape, and discontinuous protrusions are formed in the circumferential direction, or the outer peripheral surface 1a of the nipple 1 is more tube than the locked portion 1b. It is also possible to form or change only the part on the side of the withdrawal direction U in a concave shape.

On the outer peripheral surface 1a of the nipple 1, an annular recess 1c extending in the circumferential direction opposite to the insertion space S of the tube body B is formed, and an annular deformable annular shape such as an O-ring is formed in the annular recess 1c. The seal member 1d is fitted and mounted so as not to move in the axial direction.
The outer peripheral end of the sealing member 1d slightly protrudes from the outer peripheral surface 1a of the nipple 1 and is brought into pressure contact with the inner surface B1 of the connection end portion Ba of the tubular body B inserted into the insertion space S. It is preferable that a plurality of rib portions 1e that gradually protrude toward the outer peripheral end of the seal member 1d are provided on the outer peripheral surface 1a of the nipple 1 in a distributed manner in the circumferential direction. Thereby, the site | part which contact | abuts the some rib part 1e in the inner surface B1 of the tubular body B inserted in the insertion space S partially expands, and approaches the outer peripheral end of the sealing member 1d. For this reason, the tip end surface B2 of the tubular body B can be smoothly climbed without striking the outer peripheral end of the seal member 1d, and the seal member 1d can be prevented from protruding or turning up from the annular recess 1c.
In the illustrated example, on the outer peripheral surface 1a of the nipple 1, the first annular recess 1c, the first seal member 1d and the first rib portion 1e in the tube insertion direction N, the second annular recess 1c, and the second Two sets of the sealing member 1d and the second rib portion 1e are arranged at predetermined intervals.
Although not shown as other examples, the annular recess 1c, the seal member 1d and the rib portion 1e are arranged in one or more sets, or the rib portion 1e is eliminated, regardless of the arrangement position of the annular recess 1c. It is also possible to form in the shape of a bamboo slab in which a plurality of annular protrusions and annular grooves are alternately formed in the tube insertion direction N.

Further, the nipple 1 is provided with a joint main body 11 to which other equipment (not shown), other pipes (not shown) and the like are connected, and other equipment and other pipes connected to the joint main body 11 are provided. It is preferable to connect with the tubular body B.
In the illustrated example, a tubular joint body 11 formed separately from the nipple 1 is detachably attached to the nipple 1 on the inner side in the tube insertion direction N. The joint body 11 is connected to a tool 11 (not shown) such as a spanner or a wrench that engages with a connecting portion 11a for connecting to a pipe connection port (not shown) such as another device or another pipe. The joint portion 11b is integrally formed. When the internal thread is engraved on the inner peripheral surface of the pipe connection port in other equipment connected to the pipe joint A or other pipe bodies, the connection portion 11a is engraved with the corresponding external screw. When an external screw is engraved on the outer peripheral surface of the pipe connection port, an internal screw corresponding to this is engraved. In the illustrated example, an external screw is engraved as the connection portion 11a. As the tool engaging portion 11b, a hexagon nut is formed.
Further, although not shown as another example, the nipple 1 and the joint body 11 can be integrally formed.

The fastening member 2 is made of a metal material such as stainless steel or a rigid material such as synthetic resin, and is formed in a substantially cylindrical shape with a part of the axial direction thereof having an inner diameter larger than an outer diameter of a sleeve 3 to be described later. It is attached or connected so that it cannot move in the axial direction with respect to the side.
The inner peripheral surface of the fastening member 2 has a tapered surface 2 a for pressing the connection end Ba of the tube body B inserted into the insertion space S in the radial direction toward the outer peripheral surface 1 a of the nipple 1.
The taper surface 2a is a fastening means for the sleeve 3 to be described later, and the inner peripheral surface of the fastening member 2 gradually increases in diameter toward the tube insertion direction N and gradually decreases in the tube removal direction U. So as to be inclined.
On the inner peripheral surface of the fastening member 2, a stepped portion 2 b is formed on the proximal end side in the tube removal direction U so as to face a sleeve 3 described later. It is preferable that the stepped portion 2b abuts against the sleeve 3 when the sleeve 3 is moved in the tube removal direction U, thereby preventing the sleeve 3 from further movement in the tube removal direction U.
In the example illustrated as a specific example of the fastening member 2, an inner screw portion 2 c formed at the distal end in the tube insertion direction N on the inner peripheral surface of the fastening member 2 is screwed to the outer screw portion 11 c of the joint body 11. It is attached integrally by tightening. A detent ring 7 is sandwiched between the tightening member 2 and the joint body 11, and the detent portion 7 a of the detent ring 7 is concavo-convexly fitted with the detent portion 11 d of the joint body 11. After tightening the inner thread portion 2c of the tightening member 2 with respect to the outer thread portion 11c of the joint body 11, the tightening member 2 and the non-rotating ring 7 are integrated by welding or the like, whereby the tightening member 2 rotates relative to the joint body 11. It is configured so that it cannot be disassembled.
Although not shown in the drawings as another example, the nipple 1 or joint is not fixed to the nipple 1 or joint body 11 by welding or the like without being screwed together, or without the rotation ring 7 being sandwiched. The fastening member 2 can be fixed integrally with the main body 11, or the fastening member 2 can be detachably connected to the nipple 1 or the joint main body 11.

The sleeve 3 is made of an elastically deformable material such as polyacetal resin or other synthetic resin having excellent surface slipperiness and heat resistance, and is formed in a substantially cylindrical shape that can be radially expanded and contracted. Yes. The inner diameter of the sleeve 3 is set to be substantially the same as or larger than the outer diameter of the connection end Ba of the tube B when the diameter is expanded, and smaller than the outer diameter of the connection end Ba of the tube B when the diameter is reduced. Is set to
In the example shown in FIGS. 1 to 5 as a specific example of the sleeve 3, a plurality of linear slits or dents are formed in a part in the axial direction so as to be easily elastically deformed in the radial direction. Has been.
Although not shown in the drawings as other examples, a slit or a recess is cut out over the entire axial length of the sleeve 3, or a slit or a recess extending in the axial direction from both axial ends of the sleeve 3 is formed. It is also possible to form a plurality of cutouts in the circumferential direction, or to form slits or dents extending in a non-linear shape such as a curve.

The sleeve 3 is disposed so as to reciprocate in the tube insertion direction N and the tube withdrawal direction U along the tapered surface 2a of the fastening member 2, and elastically expands in diameter as the tube 3 moves in the tube insertion direction N. It is set so as to be elastically reduced in diameter as it moves in the direction U.
Furthermore, the sleeve 3 includes an engaging portion 31 that is detachably engaged with an engaged portion 42 of a driven ring 4 to be described later, and a linked portion 32 that contacts the driven ring 4 when the engaging portion 31 is disengaged. The sliding portion 33 that reciprocally moves in the tube insertion direction N and the tube removal direction U along the inner peripheral surface of the fastening member 2, and the connection end portion Ba of the tube body B inserted in the insertion space S. It has an outer surface B3 and a stopper portion 34 facing in the radial direction.

The engaging portion 31 is formed on the distal end side in the tube insertion direction N of the sleeve 3 so as to face the engaged portion 42 of the driven ring 4 described later in the radial direction. The engaging portion 31 supports the sleeve 3 so as not to move in the tube pulling direction U by engagement with the engaged portion 42 of the driven ring 4, and the sleeve 3 is pulled out by releasing the engagement with the engaged portion 42. It is set to be movable in the direction U.
In the example shown in FIGS. 1 to 5 as specific examples of the engaging portion 31 and the engaged portion 42, the engaging portion 31 of the sleeve 3 is formed in a convex shape in the radial direction, and the engaged portion of the driven ring 4. 42 is formed in a concave shape in the radial direction, and the engaging portion 31 and the engaged portion 42 are engaged with each other. Further, although not shown as other examples, the engaging portion 31 and the engaged portion 42 can be changed so as to be detachably engaged with a structure other than the concave-convex fitting.
The linked portion 32 is formed at the tip of the sleeve 3 in the tube insertion direction N, and the linkage portion 43 of the driven ring 4 to be described later by disengaging the engaging portion 31 with the engaged portion 42 of the driven ring 4 to be described later. It is set so as to abut in the tube withdrawal direction U.
The sliding portion 33 is formed on the outer peripheral surface of the sleeve 3 so as to be opposed to the tapered surface 2a of the fastening member 2 in the radial direction, and the fastening member 2 is brought into contact with the linked portion 32 and a linkage portion 43 of the driven ring 4 described later. It is set to be movable in the tube pull-out direction U along the taper surface 2a.
The stopper portion 34 is formed to protrude in the radial direction on the outer peripheral surface of the sleeve 3, and is directed toward the outer surface B3 of the tube body B by the movement of the sliding portion 32 along the tapered surface 2 a of the fastening member 2 in the tube removal direction U. The inner end of the lever is set so as to be reduced in diameter smaller than the outer diameter of the tube B. As for the shape of the stopper part 34, it is preferable to sharpen the inner end toward the outer surface B3 of the tubular body B at an acute angle. A plurality of stoppers 34 are preferably arranged in the tube insertion direction N.
1 to 5 as specific examples of the stopper portion 34, the same number of stopper portions 34 are provided at the same interval as the first seal member 1d and the second seal member 1d provided on the outer peripheral surface 1a of the nipple 1. It is arranged. In the initial state shown in FIGS. 1A and 1B, the stopper portion 34 is disposed in the tube insertion direction N with respect to the seal member 1d. 4 (a) and 4 (b), the stopper portion 34 and the seal member 1d are arranged so as to face each other in the radial direction with the connection end portion Ba of the tube B interposed therebetween. .

The driven ring 4 is formed in a substantially cylindrical shape with a material such as polyacetal resin or other synthetic resin having excellent slidability and heat resistance on the other surface, similar to the sleeve 3, and is formed along the outer peripheral surface 1 a of the nipple 1. It is arranged so as to be able to reciprocate in the insertion direction N and the tube withdrawal direction U.
The driven ring 4 is detachably engaged with an engaging portion 41 that is immovably engaged with the engaged portion 1b of the outer peripheral surface 1a of the nipple 1 in the tube withdrawal direction U and an engaging portion 31 of the sleeve 3. An engaged portion 42 to be engaged, a linked portion 43 that comes into contact with the linked portion 32 of the sleeve 3 in the tube withdrawal direction U when the engaged portion 42 is disengaged, and a receiving portion 44 of the elastic member 5 described later. ,have.

The locking portion 41 is formed on the inner peripheral surface of the driven ring 4 so as to protrude from the distal end side in the tube insertion direction N so as to face the locked portion 1b of the nipple 1 in the tube removal direction U. In the initial state shown in FIGS. 1 (a) and 1 (b), the locking portion 41 locks the driven ring 4 with respect to the locked portion 1b by the locking with the locked portion 1b of the nipple 1. It is set so that it is locked so as to be immovable and temporarily fixed. The locking portion 41 releases the engagement with the locked portion 1b in the state where the driven ring 4 shown in FIGS. 2A and 2B starts to be pushed, and the driven ring 4 moves in the tube pulling direction U. It is set to be possible.
The engaged part 42 is formed on the driven ring 4 on the proximal end side in the tube removal direction U. The engaged portion 42 is set so as to oppose and engage in a radial direction with the engaging portion 31 of the sleeve 3 that has moved in the tube insertion direction N in the initial state shown in FIGS. . The engaged portion 42 is set so as to release the engagement of the engaged portion 42 with the engaging portion 31 of the sleeve 3 when the driven ring 4 is started to be pushed as shown in FIGS. ing.
The linkage portion 43 is formed at the proximal end in the tube pull-out direction U in the driven ring 4. The linking part 43 is set so as to abut on the linked part 32 of the sleeve 3 in the tube withdrawal direction U in the state where the driven ring 4 is completely pushed as shown in FIGS.
The receiving portion 44 is formed on the outer peripheral surface of the driven ring 4 so as to be opposed to the proximal end side in the tube removal direction U and the tube removal direction U in the elastic member 5 described later. An urging force is always applied to the driven ring 4.

Further, the driven ring 4 is formed to be elastically expandable and contractible in the radial direction, and is formed to face the distal end surface B2 of the tubular body B inserted into the tube insertion space S in the tube insertion direction N. It is preferable to have a guide portion 45.
The expandable / deformable driven ring 4 is formed so as to be capable of expanding and contracting in the radial direction by notching a slit, a dent, or the like with an elastically deformable material like the sleeve 3. The inner diameter of the driven ring 4 excluding the locking portion 41 is smaller than the outer diameter of the connection end portion Ba of the tube body B when the diameter is reduced, and the tip end surface B2 of the tube body B is brought into contact with the linkage portion 43. Is set to When the diameter is expanded, the outer diameter of the connecting end portion Ba of the tube body B is set so that the distal end surface B2 of the tube body B enters the driven ring 4 and contacts the locking portion 41. ing.
The guide portion 45 is formed in an annular shape on the base end surface in the tube removal direction U in the driven ring 4, and is slidably contacted in the radial direction with the contact with the distal end surface B <b> 2 of the tube body B inserted into the tube insertion space S. A guide surface 45a for expanding and deforming the ring 4 is provided.
The guide surface 45a is formed in an inclined shape that gradually protrudes from the radially inner side to the outer side of the driven ring 4 in the tube removal direction U, and extends along the distal end surface B2 of the tube body B in the diameter increasing direction. By sliding, the driven ring 4 is configured so as to be deformed to expand its diameter as a whole.

The elastic member 5 is an elastic body formed to be elastically deformable in at least one direction, such as a coil spring or a spring. The elastic member 5 is disposed so as to be stretchable and deformable in the tube insertion direction N and the tube removal direction U across the nipple 1 side and the driven ring 4, and always presses the driven ring 4 elastically toward the tube removal direction U. Yes.
In the example shown in the figure, a coil spring is interposed as an elastic member 5 between a convex portion 1 f that is formed on the outer peripheral surface 1 a of the nipple 1 in the tube insertion direction N and a receiving portion 44 of the driven ring 4. doing. As a result, the pressing force of the coil spring acts uniformly on the driven ring 4 in the circumferential direction.
Although not shown as another example, an elastic body different from the coil spring is used as the elastic member 5, or the elastic member 5 is interposed between the joint body 11 and the driven ring 4 instead of the convex portion 1 f of the nipple 1. It is also possible to change.

The positioning means 6 is disposed so as not to interfere with the movement of the driven ring 4 and the elastic member 5 and restricts the movement of the sleeve 3 in the tube insertion direction N.
In the example shown in FIGS. 1 to 5 as a specific example of the positioning means 6, a cylindrical body 6 a formed separately from the fastening member 2 is interposed between the convex portion 1 f of the nipple 1 and the outer peripheral step portion 35 of the sleeve 3. The driven ring 4 and the elastic member 5 are arranged inside the cylindrical body 6a.
Although not shown as another example, the positioning means 6 of the sleeve 3 can be changed to another shape instead of the cylindrical body 6a.

Next, the operation of the pipe joint A shown in FIGS. 1 to 5 will be described.
First, in the initial state shown in FIGS. 1 (a) and 1 (b), the diameter-deformed driven ring 4 is pressed in the tube pull-out direction U by the urging force of the elastic member 5, and the locking portion 41 of the driven ring 4 is moved to the nipple 1. The outer peripheral surface 1a is temporarily locked so as to be immovable in the tube pull-out direction U. At the same time, the engaged portion 42 of the driven ring 4 and the engaging portion 31 of the sleeve 3 are engaged (concave fitting), so that the sleeve 3 does not move in the tube pull-out direction U and remains expanded in diameter. Retained.
In this initial state, even if the distal end surface B2 of the tube body B inserted into the tube insertion space S hits the linkage portion 43 of the driven ring 4, the driven ring 4 is tubed by the tube body B against the urging force of the elastic member 5. There may be insufficient insertion that does not sufficiently push in the insertion direction N. When the tube B is insufficiently inserted, the stopper portion 34 of the sleeve 3 is temporarily fixed while moving in the tube insertion direction N with respect to the seal member 1d of the outer peripheral surface 1a of the nipple 1. For this reason, the connection end portion Ba of the tube body B is not sandwiched in the radial direction by the stopper portion 34 and the seal member 1d, and can be easily pulled out.

2A and 2B, when the driven ring 4 starts to be pushed, the distal end surface B2 of the tube B is abutted against the driven ring 4 so that the driven ring 4 biases the elastic member 5. Against this, it is pushed along the outer peripheral surface 1a of the nipple 1 in the tube insertion direction N.
When the driven ring 4 is pushed, the locking portion 41 of the driven ring 4 is separated from the locked portion 1b of the outer peripheral surface 1a of the nipple 1 and the engagement of the engaged portion 42 with the engaging portion 31 of the sleeve 3 is released. Is done.
At this time, since the sleeve 3 is prevented from moving in the tube insertion direction N by the positioning means 6, the guide surface 45a of the guide portion 45 of the driven ring 4 slides in the diameter increasing direction along the distal end surface B2 of the tube B. Thus, the driven ring 4 begins to expand and deform as a whole.

3 (a) and 3 (b), the distal end surface B2 of the tubular body B enters the inside of the driven ring 4 and comes into contact with the locking portion 41 to follow the driven ring. The expanded state of 4 is maintained.
By maintaining the diameter of the driven ring 4, the locking of the locking portion 41 with respect to the locked portion 1b of the nipple 1 is released.
When the locking portion 41 is unlocked, the driven ring 4 is pushed in the tube removal direction U by the urging force of the elastic member 5, so that the linkage portion 43 of the driven ring 4 and the linked portion 32 of the sleeve 3 are in the tube removal direction U. Abut. At this time, the urging force of the elastic member 5 is also transmitted to the tube B by the contact between the distal end surface B2 of the tube B and the locking portion 41 of the driven ring 4.

4 (a) and 4 (b), the sliding portion 32 of the sleeve 3 is brought into contact with the tapered surface 2a of the fastening member 2 through the driven ring 4 by the biasing force of the elastic member 5. Along the tube removal direction U.
Due to the movement of the sliding portion 32, the sleeve 3 is reduced in diameter and tightens the tubular body B toward the outer peripheral surface 1a of the nipple 1, and the tubular body B is also pushed back in the tubular removal direction U.
Finally, the stopper portion 34 of the sleeve 3 and the sealing member 1d of the outer peripheral surface 1a of the nipple 1 face each other in the radial direction with the connection end portion Ba of the tube body B interposed therebetween. For this reason, the stopper portion 34 of the sleeve 3 bites into the outer surface B3 of the tube B, and at the same time, the inner surface B1 of the tube B comes into close contact with the seal member 1d of the outer peripheral surface 1a of the nipple 1.

According to such a pipe joint A according to the embodiment of the present invention, even if the operator inserts the pipe body B into the pipe insertion space S, as shown in FIGS. 1A and 1B, the elastic member 5 In some cases, the driven ring 4 is not sufficiently pushed in the tube insertion direction N by the tube body B against the urging force. When the tube B is insufficiently inserted, the driven ring 4 is temporarily fixed and held by the locking portion 41 so as not to move in the tube removal direction U, and the sleeve 3 is temporarily moved so as not to move in the tube removal direction U by the engaging portion 31. Stop and hold.
Thereby, since the sleeve 3 is not deformed by diameter reduction and maintains the expanded diameter state, the tube body B is not prevented from being detached and is easily pulled out. When a leak test (leak test) is performed under this condition, fluid leak is detected, and anyone can easily understand the insufficient insertion of the tube B.
When the operator sufficiently pushes the driven ring 4 in the tube insertion direction N against the urging force of the elastic member 5 with the tube B, as shown in FIGS. The engaging portion 41 of the driven ring 4 is separated from the outer peripheral surface 1a (the locked portion 1b), and the engagement between the engaging portion 31 of the sleeve 3 and the engaged portion 42 of the driven ring 4 is released. Subsequently, as shown in FIGS. 3 (a) and 3 (b), the follower ring 4 is pushed in the tube pull-out direction U by the urging force of the elastic member 5, so that the linkage part 43 is connected to the linked part 32 of the sleeve 3. It abuts in the tube withdrawal direction U. For this reason, as shown in FIGS. 4A and 4B, the sliding portion 32 of the sleeve 3 is moved along the fastening member 2 (tapered surface 2a) through the driven ring 4 by the biasing force of the elastic member 5. It is possible to move in the withdrawal direction U. As a result, the sleeve 3 is deformed in diameter, and the tube B is tightened toward the outer peripheral surface 1 a of the nipple 1, and the inner surface B 1 of the tube B is in close contact with the outer peripheral surface 1 a of the nipple 1. When the tubular body B is a flexible soft hose or the like, the inside of the tubular body B is caused by a balance between the repulsive force of the tubular body B itself and the tightening force of the sleeve 3 by the biasing of the elastic member 5. The surface B1 is brought into close contact with the outer peripheral surface 1a of the nipple 1 to exhibit airtightness over a long period of time.
Therefore, the operator himself can feel and confirm the insufficient insertion state of the tube B.
As a result, there is a sense of resistance in pipe insertion, and there is a risk of stopping the pipe insertion work in the middle. It is possible to reliably grasp that the tube B has been inserted, and it is possible to easily and reliably prevent the tube B from being insufficiently inserted. For this reason, an operator and a site manager can perform piping work of the pipe body B with peace of mind.
Moreover, even if deterioration of the sealing member 1d and a decrease in the biting force of the sleeve 3 (stopper portion 34) with respect to the outer surface B3 of the tubular body B progress with aging, the tubular body B is inserted to a predetermined position. For this reason, the pull-out strength of the tube B is not significantly reduced. In this situation, even if a fluid pressure (internal pressure) passing through the tube B rises or a vibration such as an earthquake occurs, the urging force of the elastic member 5 can prevent the tube B from coming off and fluid leakage, and can be used for a long time. The connection state of the tube B can be reliably maintained.
As a result, the tubular body B does not come off semi-permanently, and the sealing performance with the tubular body B can be maintained semi-permanently, resulting in excellent safety.

In particular, the driven ring 4 is formed so as to be capable of expanding and contracting in the radial direction, and has a guide portion 45 formed to face the distal end surface B2 of the tube body B and the tube insertion direction N. It is preferable to have a guide surface 45a for diameter expansion deformation that is slidably contacted in the radial direction in contact with the distal end surface B2 of the tubular body B.
In this case, the operator pushes the driven ring 4 in the tube insertion direction N against the urging force of the elastic member 5 while abutting the distal end surface B2 of the tubular body B against the guide portion 45 of the driven ring 4 in the reduced diameter state. When sufficiently pushed, the guide surface 45a slides in the diameter increasing direction along the distal end surface B2 of the tube B as shown in FIGS. The diameter is expanded.
As a result, as shown in FIGS. 3A and 3B, the distal end surface B <b> 2 of the tubular body B enters the driven ring 4 to maintain the diameter-expanded state of the driven ring 4, and the outer periphery of the nipple 1. The locking of the locking portion 41 with respect to the surface 1a (locked portion 1b) is released. Along with this, the driven ring 4 is pushed in the tube withdrawal direction U by the urging force of the elastic member 5, and the linkage portion 43 comes into contact with the linked portion 32 of the sleeve 3 in the tube withdrawal direction U.
For this reason, as shown in FIGS. 4A and 4B, the sleeve 3 moves in the tube pulling direction U along the fastening member 2 through the driven ring 4 by the biasing force of the elastic member 5.
Therefore, the sleeve 3 can be smoothly reduced in diameter by the expansion / contraction deformation of the driven ring 4.
As a result, the tubular body B can be prevented from coming off smoothly and reliably, and the operability is excellent.

Further, it is preferable that a positioning means 6 for restricting movement in the tube insertion direction N contacting the sleeve 3 is provided, and the positioning means 6 is disposed at a position where it does not interfere with the movement of the driven ring 4 and the elastic member 5.
In this case, when the tube B is inserted, as shown in FIGS. 1A and 1B, the sleeve 3 is engaged with the driven ring 4 by the engaging portion 31 and cannot move in the tube removal direction U. It is supported by.
In this initial state, when the driven ring 4 is pushed in the tube insertion direction N against the urging force of the elastic member 5 by the tubular body B, the positioning means 6 causes the positioning ring 6 to move as shown in FIGS. The sleeve 3 cannot move in the tube insertion direction N. For this reason, only the driven ring 4 moves and the engagement with the sleeve 3 by the engaging portion 31 is released.
Thereby, as shown in FIGS. 3A and 3B and FIGS. 4A and 4B, the sleeve 3 is pulled out along the fastening member 2 through the driven ring 4 by the biasing force of the elastic member 5. Move in direction U.
Therefore, the engagement of the sleeve 3 with the driven ring 4 can be released smoothly.
As a result, the tubular body B can be prevented from coming off smoothly and reliably, and the operability is excellent.

  In the illustrated example, a hose having a single layer structure is used as the tubular body B, and it is also described that the hose is replaced with a laminated hose or a spiral reinforced hose. However, the present invention is not limited to this. A pipe or the like may be used.

DESCRIPTION OF SYMBOLS 1 Nipple 1a Outer peripheral surface 2 Tightening member 2a Tapered surface 3 Sleeve 31 Engagement part 32 Linked part 33 Sliding part 4 Driven ring 41 Locking part 43 Linking part 45 Guide part 45a Guide surface 5 Elastic member 6 Positioning means B Tube B1 Inner surface B2 Tip surface B3 Outer surface N Tube insertion direction U Tube removal direction

In order to solve such problems, a pipe joint according to the present invention is provided with a nipple provided in a radial direction opposite to an inner surface of a pipe body, and an insertion space for the pipe body sandwiched outside the nipple. A clamping member that radially presses the inner surface of the tubular body toward the outer peripheral surface of the nipple, and a reciprocating motion along the clamping member in the insertion direction of the tubular body and in a reverse tube withdrawal direction. A retaining sleeve that is disposed so as to be reduced in diameter as the tube moves in the tube removal direction; and on the inner side of the sleeve in the insertion direction of the tube , the tube body is opposed to the tube body. A driven ring that is reciprocally movable in the insertion direction and the tube removal direction, and an elastic member that is provided so as to urge the driven ring in the tube removal direction. The tube Locked immovably to direction, a locking portion and locking is released for the nipple in pushing in the insertion direction of the tubular body by the tubular body, and a linkage portion for detachably contacting with the sleeve The sleeve is engaged with the driven ring and is supported so as not to move in the tube pull-out direction, and the engagement with the driven ring is released when the driven ring is pushed. And a linked portion that comes into contact with the linked portion of the driven ring and is movable in the tube pull-out direction by the elastic member when the engagement with the engaging portion is released, the linked portion, and the driven A sliding portion that is movable in the tube pull-out direction along the tightening member by the elastic member via the driven ring with the contact of the linkage portion of the ring.

DESCRIPTION OF SYMBOLS 1 Nipple 1a Outer peripheral surface 2 Tightening member 2a Tapered surface 3 Sleeve 31 Engagement part 32 Linked part 33 Sliding part 4 Driven ring 41 Locking part 43 Linking part 45 Guide part 45a Guide surface 5 Elastic member 6 Positioning means B Tube B1 Inner surface B2 Tip surface B3 Outer surface N Tube insertion direction ( tube insertion direction )
U Tube removal direction

Claims (3)

A nipple provided radially opposite the inner surface of the tubular body;
A clamping member that is provided so as to sandwich the tube body outside the nipple and presses the inner surface of the tube body radially toward the outer peripheral surface of the nipple;
A slip-preventing sleeve disposed so as to reciprocate in the tube insertion direction and the tube pull-out direction opposite to the tube insertion direction along the tightening member, and provided so as to be reduced in diameter as the tube moves in the tube pull-out direction;
A driven ring provided on the back side in the tube insertion direction of the sleeve so as to be reciprocally movable in the tube insertion direction and the tube removal direction so as to face the tube body;
An elastic member provided to urge the driven ring in the tube pull-out direction,
The driven ring is locked to the nipple so as not to move in the tube pull-out direction, and is locked to the nipple by being pushed in the tube insertion direction by the tube body; and A linking portion that detachably contacts the sleeve;
The sleeve is engaged with the driven ring and is supported so as not to move in the tube removal direction, and the engagement portion is released from engagement with the driven ring as the driven ring is pushed. A linked portion that comes into contact with the linkage portion of the driven ring and is movable in the tube pulling direction by the elastic member when the engagement with the coupling portion is released, and the linked portion of the linked portion and the driven ring And a sliding portion that is movable in the tube pull-out direction along the tightening member by the elastic member via the driven ring with the contact of the pipe joint.   The follower ring is formed so as to be capable of being expanded and contracted in a radial direction, and has a guide portion that is formed so as to be opposed to a distal end surface of the tube body in the tube insertion direction. 2. The pipe joint according to claim 1, further comprising a guide surface for diameter expansion deformation that comes into sliding contact with the tip end surface of a body in a radial direction.   3. A positioning means for restricting movement in the tube insertion direction in contact with the sleeve is provided, and the positioning means is disposed at a position that does not interfere with the movement of the driven ring and the elastic member. The described pipe joint.

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