JP2015048888A5 - - Google Patents

Description

Pipe fitting

  The present invention relates to a pipe joint used for pipe-connecting a flexible deformable hose, tube, or other tubular body made of a soft material such as synthetic resin or rubber.

Conventionally, as a pipe joint of this type, a joint body having a cylindrical guide portion fitted in a connection pipe, and a concentric outer fit having a gap into which the connection pipe is inserted into the guide portion of the joint body. A tightening ring that can be reduced in diameter at a portion facing the guide portion, and is externally fitted to the tightening ring so as to reduce the diameter of the portion that can be reduced in diameter. Some have a cap nut that deforms the fitted connecting pipe (see, for example, Patent Document 1).
In Patent Document 1, the joint body has an outer hexagonal nut portion at the center. The tightening ring is formed so that the inner peripheral surface of the fitting main body fitted on the nut portion of the fitting main body is fitted with a predetermined gap between the hexagonal flange portion and the fitting main body guide portion. And a cylindrical reduced diameter portion provided on the end face. On one side of the inner peripheral surface of the cap nut, a thread groove that is screwed with a thread groove provided on the outer peripheral surface of the reduced diameter portion of the tightening ring is formed. Then, in a state where the connecting pipe is inserted into the gap between the reduced diameter portion of the tightening ring and the guide portion of the joint main body, the cap nut is rotated and screw-fed to the reduced diameter portion, whereby the inner peripheral surface of the cap nut The taper surface of the central portion comes into contact with the distal end of the reduced diameter portion, and the distal end portion of the reduced diameter portion is reduced in diameter. As a result, the end portion of the connecting pipe is prevented from coming off while being fitted to the guide portion of the joint body and the reduced diameter portion of the tightening ring.

Japanese Patent Laid-Open No. 02-062498

However, in such a conventional pipe joint, since the nut portion of the joint body is fitted on the inner peripheral surface of the flange portion of the tightening ring and both are integrally attached, the guide portion of the joint body is The reduced diameter portion of the tightening ring is easy to tilt. As a result, there is a problem that the gap between the guide portion and the reduced diameter portion is decentered and it becomes difficult to insert the connecting pipe.
Furthermore, even if the connecting pipe is sandwiched between the guide part of the joint body and the reduced diameter part of the tightening ring by tightening with the cap nut, if a large force acts on the connecting pipe in the pulling direction, the connecting pipe is moved along the guide part of the joint body. There was also a problem that the end of the sliding part slipped out together with the clamping ring and the cap nut.
In addition, when a tubular body such as a deformable hose or tube formed of a soft material is used as the connecting pipe, the amount of diameter reduction on the outer surface of the tubular body is increased by tightening with a cap nut, and this is followed. As a result, the deformation amount of the reduced diameter portion of the tightening ring also increases. As a result, when a tubular body made of synthetic resin or rubber is tightened even once with the reduced diameter portion of the fastening ring, the reduced diameter portion plastically deforms beyond the elastic deformation region. As a result, after opening the pipe body from the pipe joint, even if it is attempted to reconnect the pipe body, the reduced diameter portion deformed plastically becomes an obstacle and the pipe body cannot be inserted, and the reduced diameter portion is replaced. There is a need.
However, in the pipe joint as in Patent Document 1, since the tightening ring integrally forms the flange part fitted to the nut part of the joint body in addition to the reduced diameter part, the pipe body is connected again. In some cases, the entire fastening ring, including the reusable collar, must be replaced, resulting in a high cost.

An object of the present invention is to cope with such a problem, and an object of the present invention is to position the sleeve so that it can not move in the direction in which the tubular body is pulled out with respect to the nipple .

In order to achieve such an object, the present invention provides a joint body having a nipple provided along an insertion space of a deformable tubular body, an outer peripheral surface of the nipple and the insertion space of the tubular body. A sleeve provided so as to face in the radial direction; and a fastening member provided outside the sleeve to reduce a diameter of a part of the sleeve toward the insertion space, and the outer peripheral surface of the nipple and the A retaining means for engaging the nipple and the sleeve in the axial direction is provided across the inner peripheral surface of the sleeve, and the retaining means includes a protrusion formed on the outer peripheral surface of the nipple, and the protrusion. A latch formed on the inner peripheral surface of the sleeve so as to be elastically deformable in a radial direction so as to get over and fit in the insertion direction of the tube with respect to the strip and to lock in a direction opposite to the insertion direction of the tube. With a piece It is characterized in.

In the present invention having the above-described features, as a retaining means provided across the outer peripheral surface of the nipple and the sleeve, a locking piece formed on the inner peripheral surface of the sleeve is provided against a protrusion formed on the outer peripheral surface of the nipple. At the same time as it is elastically deformed in the radial direction and gets over and fitted in the tube insertion direction, the locking piece is locked in the tube removal direction and immovably locked when it gets over the ridge.
Therefore, it is possible to position the sleeve so that it cannot move in the direction in which the tube is pulled out with respect to the nipple.
As a result, when a large force acts on the connecting pipe in the pulling direction, the end of the connecting pipe slides along the guide portion of the joint body and comes out together with the tightening ring and the cap nut. In addition, it is possible to reliably prevent the tubular body from coming off and to improve the coming-off strength.

It is explanatory drawing which shows the whole structure of the pipe joint which concerns on embodiment of this invention, (a) is a longitudinal front view before a connection, (b) is a longitudinal front view after a connection. It is the same perspective view, (a) shows a state after assembly, (b) shows a state where a fastening member and a part of the sleeve are removed, (c) shows the other part of the sleeve in FIG. A partially cut out state is shown. It is the exploded perspective view, (a) is the whole exploded perspective view, (b) is the exploded perspective view which looked at only the sleeve from the reverse direction.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 3, the pipe joint A according to the embodiment of the present invention is provided with a sleeve 20 attached to a joint body 10 having a nipple 11 so as to cover a part of the outer periphery, and the nipple 11 and the sleeve 20. After the tube B is inserted in the axial direction, the inner surface B1 of the tube B is brought into pressure contact with the outer peripheral surface 11a of the nipple 11 by being tightened in the radial direction by the tightening member 30 from the outside of the sleeve 20, and is detachable. It is a connector for pipe connection.
More specifically, a pipe joint A according to an embodiment of the present invention includes a joint body 10 having a nipple 11 provided along an insertion space S of a flexible deformable pipe B, and an outer periphery of the nipple 11. A sleeve 20 provided so as to face the surface 11a and the insertion space S of the tube B in the radial direction, and a part of the sleeve 20 provided outside the sleeve 20 is partially reduced in diameter toward the insertion space S. A fastening member 30 for deformation is provided as a main component.
1A and 1B, the insertion direction N of the tube B with respect to the insertion space S is referred to as “the tube insertion direction N”, and the reverse direction U of the tube insertion direction N is referred to as “the following. This is referred to as “pipe-out direction U”.

The joint main body 10 is a plate or pipe made of a rigid material such as a metal such as brass or a hard synthetic resin, which is formed into a substantially cylindrical shape with a large thickness, or is deformable by a tool such as stainless steel. Is formed into a substantially cylindrical shape with a small thickness.
A cylindrical nipple 11 is formed on the distal end side of the joint body 10, and a protruding portion 12 is formed on the proximal end side of the nipple 11.
The nipple 11 has an outer diameter that is substantially the same as, or slightly larger than, or slightly smaller than the inner diameter of the tube B, which will be described later, and the outer peripheral surface 11a of the nipple 11 is entirely smooth. . That is, the nipple 11 corresponds to the “joint body guide portion” of Patent Document 1.
At a predetermined position in the axial direction on the outer peripheral surface 11a of the nipple 11, an annular ridge 41 serving as a retaining means 40 for restricting the movement of the sleeve 20 described later in the axial direction, and a tube removal of the ridge 41 are provided. The annular groove 11b disposed adjacent to the direction U side and the distal end side inner peripheral surface of the diameter-reducing member 22 of the sleeve 20 to be described later are disposed in a radial direction across the insertion space S of the tubular body B. It is preferable to form the recess-protrusion uneven portion 11c. Moreover, it is also possible to form any one or two of the protrusion 41, the annular groove 11b, and the retaining uneven portion 11c.
The protruding portion 12 is formed to have a larger diameter than the nipple 11 and corresponds to the “nut portion” of Patent Document 1.

As a specific example of the nipple 11, as shown in FIGS. 2 (a) to 2 (c) and FIGS. 3 (a) and 3 (b), a concavo-convex portion 11c for retaining is provided only on the distal end portion of the outer peripheral surface 11a. A plurality of annular concave portions and annular convex portions are alternately and continuously formed, and the outer shape of the protruding portion 12 is formed in a hexagonal shape.
Although not shown in the drawings as other examples, the outer peripheral surface 11a of the nipple 11 is formed in the shape of a bamboo slab in which annular recesses and annular projections are alternately continuous in the axial direction, or the outer shape of the protrusion 12 It is also possible to change the shape by forming the shape into another shape such as a square shape.
In the joint body 10, a connection portion 11 d for connecting to a tube connection port (not shown) of another device is connected to the back side in the tube insertion direction N from the protruding portion 12.
As a specific example of the connecting portion 11d, when an inner screw is engraved on the inner peripheral surface of a pipe connection port in another device connected to the pipe joint A, an outer screw corresponding to this is engraved, When an external screw is engraved on the outer peripheral surface of the pipe connection port, an internal screw corresponding to this is engraved.

The sleeve 20 includes a fitting portion 21a, which will be described later, which is fitted to the protrusion 12 of the joint body 10 so as not to rotate in the circumferential direction, and a screw portion, which will be described later, for the fastening member 30 to be movably engaged in the axial direction. 21b. That is, it corresponds to the “clamping ring” of Patent Document 1. As a difference from the “clamping ring”, a plurality of protrusions 21 d that contact the outer peripheral surface 11 a of the nipple 11 are formed on the inner peripheral surface of the nipple 11 at predetermined intervals in the circumferential direction.
The protrusion 21d is inserted into the tube B in the tube insertion direction N from the insertion space S of the tube B formed between the inner peripheral surface of the reduced diameter member 22 and the outer peripheral surface 11a of the nipple 11. It is formed so as to be adjacent to the space S, and the inner diameter of the protrusion 21d is brought into contact with the outer peripheral surface 11a of the nipple 11, so that the entire diameter-reducing member 22 is supported so as not to move in the radial direction.
As a specific example of the protrusion 21d, as shown in FIGS. 2 (a) to 2 (c) and FIGS. 3 (a) and 3 (b), each of the four protrusions 21d along the inner peripheral surface of the sleeve 20 is arranged in the circumferential direction. Arranged at equal intervals, the inner end surface of the protrusion 21d is brought into contact with the outer peripheral surface 11a of the nipple 11, respectively. In the case of the illustrated example, a protrusion 21d is formed to project to the vicinity of the tip 21c on the inner peripheral surface of a cylindrical member 21 described later, and the inner end surface of the protrusion 21d is formed on the outer peripheral surface 11a of the nipple 11 as will be described later. It strikes against the ridge 41.
Although not shown as other examples, the number, shape, and arrangement of the protrusions 21d are changed, the inner end surface of the protrusion 21d is brought into contact with the outer peripheral surface 11a of the protrusion 41 and the nipple 11, or the nipple 11 It is also possible to make the inner end surface of the protrusion 21d abut only on the outer peripheral surface 11a.

Furthermore, the sleeve 20 is fitted to the protrusion 12 of the joint body 10 so as not to rotate in the circumferential direction, and the cylindrical member 21 in which the fastening member 30 is movably engaged in the axial direction, and the axial movement of the fastening member 30. Is divided into a diameter-reducing member 22 that is elastically deformable in the radial direction and is reduced in diameter toward the insertion space S of the tubular body B, and the cylindrical member 21 and the reduced-diameter member 22 are joined in the axial direction and arranged. It is preferable.
The cylindrical member 21 is formed in a substantially cylindrical shape with a rigid material such as a hard synthetic resin, and a fitting portion 21 a that fits in a circumferentially non-rotatable manner with the protruding portion 12 of the joint body 10, and the fastening member 30 is in the axial direction. And a screw portion 21b and the like that are movably screwed to each other.
The outer shape of the fitting portion 21a is preferably formed in a shape that engages with a tightening tool such as a spanner, such as a hexagonal shape. That is, the fitting portion 21 a corresponds to the “trench” in Patent Document 1.
The screw portion 21 b is formed along the outer peripheral surface of the cylindrical member 21, and corresponds to the “thread groove” in Patent Document 1.
Further, in the cylindrical member 21, a proximal end portion 22c of the reduced diameter member 22 is fitted into a distal end portion 21c that is axially joined to a reduced diameter member 22 described later, and the reduced diameter member when the tubular body B is inserted. It is preferable to form an annular recess 21e for restricting the bulging deformation of 22.

The diameter-reducing member 22 is formed in a substantially cylindrical shape by an elastically deformable material such as a polyacetal resin or a synthetic resin having excellent surface slipperiness and heat resistance, and is elastically expanded in the radial direction. It has an elastically deformable portion 22a for reducing the diameter, and its inner diameter is set to be substantially the same as or larger than the outer diameter of the tube B to be described later when expanding, and the outer diameter of the tube B when reducing the diameter. It is set to be smaller.
That is, the diameter reducing member 22 is disposed so that the inner peripheral surface thereof faces the outer peripheral surface 11a of the nipple 11 substantially in parallel, so that the space between the inner peripheral surface of the reduced diameter member 22 and the outer peripheral surface 11a of the nipple 11 is reduced. In addition, an insertion space S of the tube body B, which will be described later, is partitioned and formed in a tube insertion direction N and a tube removal direction U.
Further, on the inner peripheral surface on the distal end side of the diameter-reducing member 22, a retaining uneven portion 22b is formed opposite to the retaining uneven portion 11c of the outer peripheral surface 11a of the nipple 11 with the insertion space S of the tube B interposed therebetween. It is preferable to contact the outer surface B2 of the connection end Ba of the tube body B described later. A flange 22d that protrudes toward the outer peripheral surface 11a of the nipple 11 is formed integrally with the base end 22c that joins the tubular member 21 in the reduced diameter member 22, and the flange 22d is inserted into the insertion space S. It is preferable to arrange so that it may oppose to the front end surface B3 of the connection end part Ba of the tubular body B mentioned later mentioned to an axial direction.

As a specific example of the diameter-reducing member 22, as shown in FIGS. 2A to 2C and FIGS. 3A and 3B, at least one side in the axial direction, specifically, the base in the tube insertion direction N is shown. By elastically deforming elastically in the radial direction by forming a plurality of notches 22e such as slits, slits and dents at predetermined intervals in the circumferential direction as elastically deformable portions 22a on most of the ends excluding the end 22c. Thus, the diameter is smoothly expanded or reduced. In the reduced diameter member 22, the cut 22 f is formed over the entire length in the axial direction, so that the nipple 11 can be easily attached and detached.
Although not shown as another example, a plurality of notches 22e (such as slits, slits, dents, etc.) extending linearly in the axial direction are staggered from both sides in the axial direction in the reduced diameter member 22 respectively. It is also possible to change to a structure other than the illustrated example, such as forming a notch or forming a non-linearly extending notch such as a curve.

The fastening member 30 is made of a rigid material such as a hard synthetic resin and is formed in a substantially cylindrical shape having an inner diameter larger than the outer diameter of the cylindrical member 21 or the reduced diameter member 22. A screw portion 31 that is screwed into the screw portion 21 b and a taper-shaped pressing surface 32 that abuts against the outer peripheral surface of the distal end side of the diameter-reducing member 22 are provided. That is, the fastening member 30 corresponds to the “cap nut” of Patent Document 1.
Furthermore, it is preferable to form a tool engaging portion 33 that engages with a tightening tool such as a spanner on the outer peripheral surface of the tightening member 30. A reinforcing ring 34 made of a rigid material such as a metal is provided in the inner peripheral surface of the fastening member 30 in the tube withdrawal direction U from the pressing surface 32 so as to face the elastically deforming portion 22a of the reduced diameter member 22 in the radial direction. Is preferred. In particular, when the reinforcing ring 34 is integrally formed with the fastening member 30 by insert molding, there is an advantage that the reinforcing ring 34 cannot be easily removed even if the temperature of the fastening member 30 rises.

Further, it is preferable that a retaining means 40 is provided across the outer peripheral surface 11 a of the nipple 11 and the sleeve 20, and the nipple 11 and the sleeve 20 are engaged with each other in the axial direction by the retaining means 40 and positioned.
The retaining means 40 is a stopper that restricts the movement of the sleeve 20 in the tube withdrawal direction U with respect to the nipple 11. The protrusion 41 formed on the outer peripheral surface 11 a of the nipple 11 and the tube B with respect to the protrusion 41. A locking piece 42 that can be elastically deformed in the radial direction and is fitted in the insertion direction (pipe insertion direction) N and locked in the direction U (pipe pull-out direction) U opposite to the insertion direction of the tube body B. Yes.
The sleeve 20 is inserted in the tube insertion direction N with respect to the outer peripheral surface 11 a of the nipple 11, so that the locking piece 42 gets over the protrusion 41, and at the same time when the locking piece 42 gets over the protrusion 41, The front end surface is engaged with the back side surface of the ridge 41 and is locked in the tube removal direction U.

That is, the locking piece 42 is set so that the inner diameter of the base end in the tube insertion direction N is slightly larger than the outer diameter of the protrusion 41, and gradually from the base end toward the tip in the tube removal direction U. The nipple 11 is inclined so as to protrude and approach, and the inner diameter of the tip of the nipple 11 is set to be substantially the same as or slightly smaller than the outer diameter of the nipple 11 excluding the protrusion 41.
That is, the locking piece 42 inserts the sleeve 20 in the tube insertion direction N along the outer peripheral surface 11 a of the nipple 11, so that the proximal end in the tube insertion direction N passes through the protrusion 41. The inclined portion on the distal end side with respect to the base end is bent and deformed radially outward by abutting against the protrusion 41 and gets over the protrusion 41. Immediately after passing through the ridge 41, the inclined part on the distal end side relative to the proximal end is bent and deformed radially inward to restore the original shape, and the distal end surface of the locking piece 42 abuts against the ridge 41, The cylindrical member 21 is positioned so as not to move in the tube removal direction U.

In the example shown in FIGS. 1A and 1B to FIGS. 3A and 3B, a plurality of locking pieces 42 are provided at predetermined intervals in the circumferential direction on the inner peripheral surface of the cylindrical member 21 of the sleeve 20. Is formed. More specifically, four locking pieces 42 are arranged at equal intervals in the circumferential direction between the four protrusions 21d on the inner peripheral surface of the cylindrical member 21.
Although not shown as another example, the number, shape, arrangement, and the like of the locking pieces 42 can be changed.

On the other hand, the tube B is, for example, a soft synthetic resin such as vinyl chloride, or a soft material such as silicone rubber or other rubber, and is, for example, a hose or a tube that is flexible and deformable. In the part Ba, it is preferable that the inner surface B1 and the outer surface B2 are flat.
As a specific example of the tube B, a hose having a single layer structure is used in the illustrated example.
Although not shown as another example of the tubular body B, a plurality or a single synthetic resin blade (reinforcing thread) is embedded in a spiral as an intermediate layer between the transparent or opaque outer layer and inner layer. Laminated hose (blade hose), and a spiral reinforcing hose (four) that is formed by spirally winding a strip reinforcing material such as a synthetic resin or metal cross section rectangle and a linear reinforcing material such as a circular section as a middle layer. It is also possible to use various types of tubular bodies having different structures such as a run hose), a spiral reinforcing hose in which a metal wire or a hard synthetic resin wire is embedded in a spiral shape.

Next, the connection method of the pipe body B by the pipe joint A which concerns on embodiment of this invention is demonstrated according to process order.
First, as shown in FIG. 1A and FIG. 2B and FIG. 2C, the sleeve 20 is inserted along the nipple 11 of the joint body 10, and the fitting portion of the sleeve 20 is inserted into the protrusion 12 of the joint body 10. By fitting 21a in the circumferential direction so as not to rotate, the joint body 10 and the sleeve 20 are integrally mounted.
Thereafter, as shown in FIG. 1A and FIG. 2A, the fastening member 30 is put on the outside of the sleeve 20, and the screw portion 31 is screwed into the screw portion 21 b of the sleeve 20. Thereby, the sleeve 20 and the fastening member 30 are integrally assembled to the joint body 10.

In this set state, as shown in FIG. 1B, the connection end portion Ba of the tube body B is directed toward the insertion space S between the inner peripheral surface of the reduced diameter member 22 and the outer peripheral surface 11a of the nipple 11. Inserted.
Following this, the fastening member 30 is screwed and moved in the tube insertion direction N. Accordingly, the tapered pressing surface 32 comes into contact with the outer peripheral surface on the distal end side of the reduced diameter member 22, presses the reduced diameter member 22 in the radial direction, and is compressed and deformed by the elastic deformation portion 22a. Thereby, the connection of the tubular body B between the inner peripheral surface on the distal end side of the reduced diameter member 22 (unevenness portion for retaining 22b) and the distal end portion (unevenness portion for retaining 11c) of the outer peripheral surface 11a of the nipple 11 is connected. The end portion Ba is sandwiched in the radial direction, is compressed and deformed, and is prevented from coming off in the axial direction.
After that, when the tightening member 30 is screwed in, the connection work of the tube body B is completed.

According to such a pipe joint A according to the embodiment of the present invention, the plurality of protrusions 21d protruding from the inner peripheral surface of the sleeve 20 in the circumferential direction at predetermined intervals come into contact with the outer peripheral surface 11a of the nipple 11, respectively. 11, the sleeve 20 ( cylindrical member 21 ) is positioned so as not to tilt.
Therefore, eccentricity of the insertion space S of the tubular body B can be prevented.
As a result, since the insertion space S of the tube B has a uniform width, the tube B can be easily inserted and the workability is excellent.

In particular, a retaining means 40 for engaging the nipple 11 and the sleeve 20 in the axial direction is provided across the outer peripheral surface 11 a of the nipple 11 and the inner peripheral surface of the sleeve 20, and the retaining means 40 is provided on the outer peripheral surface of the nipple 11. A protrusion 41 formed on 11a, and a locking piece 42 that can be elastically deformed in the radial direction and is fitted over the protrusion 41 in the insertion direction N of the tube body B and locked in the tube removal direction U. In the case of having, the locking piece 42 is elastically deformed in the radial direction with respect to the protrusion 41 formed on the outer peripheral surface 11a of the nipple 11 as the retaining means 40 provided across the outer peripheral surface 11a of the nipple 11 and the sleeve 20. At the same time, the locking piece 42 is locked in the tube pulling direction U so that it cannot move.
Therefore, the sleeve 20 can be positioned relative to the nipple 11 so as not to move in the direction in which the tube B is removed.
As a result, when a large force in the detaching direction in the connection pipe acts, compared with the conventional one end of the connecting pipe along the guide portion of the joint body fall out with slide to the clamp ring and cap nut, the sleeve 20 ( cylindrical member 21 ), tube B and the like can be reliably prevented from coming off, and the strength of coming off can be improved.
Furthermore, even if the nipple 11 is made of a hard material such as metal and the sleeve 20 is made of a soft material such as a synthetic resin, the tip of the locking piece 42 is not damaged when the ridge 41 passes, It can be attached to the nipple 11 without rattling in the radial direction.
Further, as shown in the illustrated example, when the plurality of locking pieces 42 are arranged so as to be sandwiched in the circumferential direction between the protrusions 21d arranged at predetermined intervals in the circumferential direction, a molding die was used. The resin molding of the sleeve 20 becomes easy, and the manufacturing cost can be reduced.

Next, an embodiment of the present invention will be described with reference to the drawings.
In this embodiment, as shown in FIGS. 1 to 3, the sleeve 20 is fitted in the joint body 10 so as to be non-rotatable in the circumferential direction with the protruding portion 12 formed on the proximal end side of the nipple 11, and the fastening member 30. Are divided into a cylindrical member 21 that is movably engaged, and an elastically deformable reduced diameter member 22 that is reduced in diameter by movement of the fastening member 30. The cylindrical member 21 and the reduced diameter member 22 are arranged so as to join the cylindrical member 21 and the reduced diameter member 22 in the axial direction in an attached state with respect to the outer peripheral surface 11a of the nipple 11.

In the sleeve 20, it is preferable to provide a detent means 23 that engages in the circumferential direction at the joining portion between the distal end portion 21 c of the cylindrical member 21 and the proximal end portion 22 c of the reduced diameter member 22 that are joined in the axial direction.
As a specific example of the rotation preventing means 23, as shown in FIGS. 2 (a) to 2 (c) and FIGS. 3 (a) and 3 (b), a recess is formed between the protrusions 21d on the inner peripheral surface of the cylindrical member 21. 23a is formed, and a protrusion 23b is formed on the proximal end portion 22c of the diameter-reducing member 22, and the recess 23a and the protrusion 23b are fitted into the recesses and projections so that the diameter-reducing member 22 is idle with respect to the tubular member 21. I try not to.
In addition, although not shown as other examples, a protrusion is formed on the distal end portion 21c of the cylindrical member 21, and a recess portion is formed on the proximal end portion 22c of the reduced diameter member 22 so as to be unevenly fitted. It is also possible to change to a structure other than the illustrated example, such as regulating the idle rotation of the reduced diameter member 22 with respect to the cylindrical member 21 with a structure different from the uneven fitting.

That is, as shown in FIG. 1A and FIG. 2B and FIG. 2C, by inserting the tubular member 21 of the sleeve 20 along the nipple 11 of the joint body 10, the protruding portion 12 of the joint body 10 is inserted. By fitting the fitting portion 21a of the cylindrical member 21 in the circumferential direction so as not to rotate, the joint body 10 and the cylindrical member 21 are integrally attached.
Thereafter, as shown in FIGS. 1A and 2B and 2C, the cylindrical member 21 and the reduced diameter member 22 are pivoted by inserting the reduced diameter member 22 of the sleeve 20 along the nipple 11. It arrange | positions so that it may join in a direction. Thereby, the cylindrical member 21 and the reduced diameter member 22 of the sleeve 20 are assembled to the joint body 10 integrally.

According to such a pipe joint A according to the embodiment of the present invention, the sleeve 20 is engaged with the protruding portion 12 of the joint body 10 in a non-rotatable manner, and the cylindrical member 21 with which the fastening member 30 is movably engaged. Further, the cylindrical member 21 and the reduced diameter member 22 are arranged in the axial direction by being divided into a reduced diameter member 22 that is reduced in diameter by the movement of the fastening member 30. Therefore, every time the deformable tube B is connected, all the parts are repeatedly used. Accordingly, even if the reduced diameter member 22 is plastically deformed, only the reduced diameter member 22 is replaced, so that the tubular shape is obtained. The pipe B can be repeatedly connected by reusing other parts such as the member 21 and the fastening member 30.
Therefore, the pipe B can be repeatedly connected to the pipe by reusing other parts by simply exchanging a few consumable parts.
As a result, when reconnecting the tube, it is necessary to replace the parts that need to be replaced compared to the conventional one, in which not only the reduced diameter part but also the reusable collar part must be replaced. There is an advantage that the area of the reusable part is increased and the area of the reusable part is increased, and the part replacement cost can be reduced.

In particular, the tubular member 21 has a screw portion 21 b that is screwed in the circumferential direction with the fastening member 30, and the fastening member 30 has a pressing surface 32 that abuts against the outer peripheral surface of the reduced diameter member 22. In the case where the rotation preventing means 23 that engages in the circumferential direction is provided at the joint portion between the member 21 and the reduced diameter member 22, both the sleeve 20 and the reduced diameter member 22 can be divided into the cylindrical member 21 and the reduced diameter member 22. Is integrated in the circumferential direction by the rotation preventing means 23, so that the rotational movement of the fastening member 30 is not transmitted to the tubular body B via the reduced diameter member 22.
Therefore, there is an advantage that the twist accompanying the tightening of the tube body B can be prevented.
As a result, the pipe body B can be connected straight without twisting, and the convenience is excellent.

In the example shown in FIGS. 1A, 1B, 3A, and 3B, the outer peripheral surface 11a of the nipple 11 and the base end portion 22c of the reduced diameter member 22 to the outer peripheral surface 11a of the nipple 11. An annular groove 11b into which the flange portion 22d formed to project in the radial direction is fitted in the radial direction is formed in a concave shape adjacent to the insertion direction of the protrusion 41 and the tube body B (in the tube pull-out direction) U. The inner end portion of the flange portion 22d and the annular groove 11b that are fitted to each other in the radial direction may be formed so that the axial width dimension of the annular groove 11b is larger than the thickness dimension of the inner end portion of the flange portion 22d. preferable.
An annular recess 21 e into which the proximal end portion 22 c of the reduced diameter member 22 is fitted is formed at the distal end portion 21 c of the cylindrical member 21.

According to such a pipe joint A in the illustrated example, the flange portion 22d of the reduced diameter member 22 is fitted into the annular groove 11b of the nipple 11 so that the flange portion 22d of the reduced diameter member 22 cannot move in the tube withdrawal direction U. Positioned. Furthermore, when the proximal end portion 22c of the reduced diameter member 22 is fitted into the annular recess 21e of the distal end portion 21c of the cylindrical member 21, the diameter expansion deformation of the reduced diameter member 22 is restricted and the diameter reduced. The base end portion 22 c and the flange portion 22 d of the member 22 are sandwiched in the radial direction between the annular groove 11 b of the nipple 11 and the annular recess 21 e of the tubular member 21.
Therefore, the reduced diameter member 22 can be reliably prevented from being pulled out regardless of the insertion of the tube B.
As a result, it is possible to prevent malfunction due to the withdrawal of the reduced diameter member 22.
In particular, when the width dimension in the axial direction of the annular groove 11b is formed larger than the thickness dimension of the inner end portion of the flange portion 22d, the insertion and removal of the flange portion 22d with respect to the annular recess 21e and the annular groove 11b is easy. Thus, the parts replacement work of the reduced diameter member 22 can be easily performed.

Further, in the example shown in FIGS. 1A, 1B, 3A, and 3B, the screwing end position of the screw portion 31 of the fastening member 30 with respect to the screw portion 21b of the cylindrical member 21 is mutually related. The screwing restricting means 50 is formed over the tubular member 21 and the fastening member 30.
The screwing restricting means 50 has a ratchet structure composed of a concave cutout groove 51 disposed to face the radial direction and a convex locking claw 52 engaged with the cutout groove 51 in the radial direction. The notch groove 51 and the locking claw 52 are alternately and continuously formed in the circumferential direction at the screwing end position in the screw portion 21b of the cylindrical member 21 and at the screwing end position in the screw portion 31 of the fastening member 30, respectively. Yes.
In the illustrated example, a notch groove 51 and a locking claw 52 are partially formed in the circumferential direction on a base end outer peripheral surface that is a screwing end position in the screw portion 31 of the fastening member 30. A notch groove 51 and a locking claw 52 are formed in the entire circumferential direction on the inner peripheral surface of the base end that is the screwing end position in the screw portion 31 of the fastening member 30.
As a result, when the screw portion 31 of the fastening member 30 is screwed into the screw portion 21b of the cylindrical member 21 and reaches the screwing end position, the notch groove 51 and the locking claw 52 are engaged with each other. It is configured such that the operator announces sounds and accompanying resistance by hearing and feeling. Further, when the screw reaches the final position at the end of screwing, it is preferably locked by the engagement of the notch groove 51 and the locking claw 52 and held so that the fastening member 30 does not reversely rotate in the loosening direction.

According to the illustrated pipe joint A, the tightening management of the tightening member 30 with respect to the tubular member 21 can be performed properly and with good workability without using a dedicated jig or tool.
Thereby, damage to the screw part 21b of the cylindrical member 21 and the screw part 31 of the tightening member 30 due to excessive tightening of the tightening member 30 can be reliably prevented.

Although the sleeve 20 is divided into the cylindrical member 21 and the reduced diameter member 22 in the previous embodiment, the present invention is not limited to this, and the cylindrical member 21 and the reduced diameter member 22 may be connected as the sleeve 20.
Furthermore, although the retaining means 40 is provided across the outer peripheral surface 11a of the nipple 11 and the sleeve 20, the present invention is not limited to this, and the retaining means 40 may not be provided.
In the illustrated example, an annular groove 11b into which the flange portion 22d of the reduced diameter member 22 is fitted is formed on the outer peripheral surface 11a of the nipple 11, and the proximal end portion 22c of the reduced diameter member 22 is fitted into the distal end portion 21c of the cylindrical member 21. The annular recess 21e is formed, and the screwing restricting means 50 is formed at the screwing end position of the screw portion 31 of the fastening member 30 with respect to the screw portion 21b of the cylindrical member 21, but the present invention is not limited to this, and the annular groove 11b or Either the annular recess 21e or the screwing restricting means 50 may not be formed.

DESCRIPTION OF SYMBOLS 10 Joint main body 11 Nipple 11a Outer peripheral surface 11b Annular groove 12 Protruding part 20 Sleeve 21 Cylindrical member 21b Screw part 21c Tip part 21d Protrusion 21e Annular recessed part 22 Diameter reducing member 22c Base end part 22d Flange part 23 Anti-rotation means 30 Tightening member 32 Pressing surface 40 Retaining means 41 Projection 42 Locking piece B Tube S Tube insertion space N Tube insertion direction (tube insertion direction)
U The direction opposite to the tube insertion direction (tube pull-out direction)

Claims (5)

A joint body having a nipple provided along the insertion space of the deformable tube;
A sleeve provided so as to face the outer peripheral surface of the nipple and the radial direction across the insertion space of the tubular body;
A clamping member that is provided outside the sleeve and reduces a diameter of a part of the sleeve toward the insertion space;
A retaining means for axially engaging the nipple and the sleeve is provided across the outer peripheral surface of the nipple and the inner peripheral surface of the sleeve, and the retaining means is formed on the outer peripheral surface of the nipple. And an elastic in the radial direction on the inner peripheral surface of the sleeve so as to get over the protrusion in the insertion direction of the tubular body and engage in the opposite direction to the insertion direction of the tubular body And a locking piece formed so as to be deformable . 2. The pipe joint according to claim 1 , wherein a plurality of protrusions in contact with the outer peripheral surface of the nipple are formed on the inner peripheral surface of the sleeve at predetermined intervals in the circumferential direction .   A tubular member in which the sleeve is fitted in a circumferentially non-rotatable manner with a protruding portion formed on the proximal end side of the nipple in the joint body, and the fastening member is movably engaged; 3. The elastically deformable reduced diameter member that is reduced in diameter by movement, and the cylindrical member and the reduced diameter member are arranged to be joined in the axial direction. Pipe fittings.   The tubular member has a screw portion that is threadedly engaged with the fastening member in the circumferential direction, and the fastening member has a pressing surface that faces and comes into contact with an outer peripheral surface of the reduced diameter member, and the tubular member and the 4. The pipe joint according to claim 3, further comprising anti-rotation means for engaging each other in the circumferential direction at a joint portion with the reduced diameter member.   An annular groove into which the flange portion formed to protrude from the proximal end portion of the reduced diameter member toward the outer peripheral surface of the nipple is fitted on the outer peripheral surface of the nipple is opposite to the insertion direction of the protrusion and the tubular body. The pipe joint according to claim 3 or 4, wherein an annular recess is formed in a concave shape adjacent to the direction, and a proximal end portion of the reduced diameter member is fitted at a distal end portion of the cylindrical member.