JP4476263B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint.

As a conventional pipe joint, by screwing the male thread part of the retainer into the taper female thread part of the joint body, the outer top parts of a plurality of small disks protruding from the inner peripheral surface of the retainer bite into the outer peripheral surface of the pipe, It is known that the pipe is configured not to be pulled out in the axial direction (
For example, Patent Document 1).
Japanese Patent No. 312385

In this conventional pipe joint, a small disk is spirally and deeply bited around the outer peripheral surface of the pipe, so a very large tightening force is required to screw the retainer into the joint body. In short, work efficiency is poor. Moreover, the structure prevents the pulling out by several small discs that bite into the outer peripheral surface of the pipe, so if a large pulling force is applied to the pipe after the connection is completed, the pipe will come off leaving a longitudinal scratch on the outer peripheral surface of the pipe. Or the small disk may be damaged and the pipe may come off.

Accordingly, the present invention provides a pipe joint that can be tightened and connected without requiring a large force and that can be securely and firmly connected without the possibility of coming out even if a strong pulling force is applied to the pipe in the axial direction. The purpose is to provide.

In order to achieve the above object, a pipe joint according to the present invention includes a joint main body into which a pipe to be connected is inserted, and a screw connection having a hole into which the pipe is inserted and screwed into the joint main body. The joint body has an insertion tube portion that abuts against the inner peripheral surface of the pipe, has a single cut in the circumference, and is disposed in the taper portion of the hole portion of the screw member. A C-shaped retaining ring provided, and a rotor that is rotatably supported by the retaining ring and that forms a circumferential concave groove on the outer peripheral surface of the pipe by plastic deformation, and the interpolation outside circumferential surface of the cylindrical portion, circle concave peripheral groove fitting is circumferential ridges raised on the inner peripheral surface of the pipe by the plastic deformation, is formed, further, on the inner peripheral surface of the retainer ring, the circumferential It has a latching ridge part latched to a concave groove .

In addition, a pipe joint according to the present invention includes a joint body into which a pipe to be connected is inserted, and a screw member having a hole into which the pipe is inserted and screwed into the joint body. The joint body has an insertion tube portion that comes into contact with the inner peripheral surface of the pipe, has a single cut in the circumference, and is disposed in the tapered portion of the hole portion of the screw member. A retaining ring, the retaining ring is
A holding female portion penetrating from the inner peripheral surface to the outer peripheral surface, and held in the holding female portion so as to be able to rotate, abutting against a tapered portion of the hole portion of the screw member and an outer periphery of the pipe; a rotor forming a circumferential groove in the plastic deformation on the surface, with, and, on the outer peripheral surface of the inner挿筒portion, circumferential ridges raised on the inner peripheral surface of the pipe by the plastic deformation A recessed circumferential groove to be fitted is formed , and further has a locking ridge portion to be locked to the circumferential groove on the inner peripheral surface of the retaining ring.

The present invention has the following remarkable effects.
When the member having the taper portion is screwed into the joint body, the retaining ring is reduced in diameter.
Fit into the groove (formed by the rotor) and lock securely.
Therefore, the pipe is securely connected to the pipe joint, the pull-out preventing force becomes extremely large, and there is no possibility that the pipe will come out unexpectedly after construction.
In this screwing, the rotor revolves while rotating (self-rotating) in contact with the tapered portion, so that the rotational torque of the screwing member is very small. In addition, it is easy to set the retaining ring and it does not take much trouble, so that the work can be performed quickly and smoothly.
In addition, since the concave groove is formed by plastic deformation, chips are not generated from the pipe, it can be smoothly screwed, work is easy, and various places and pipes are connected. Convenient to.
Furthermore, connection of composite pipes can also be performed and it can be used for connection of many kinds of pipes.
And since the circumferential bulge that bulges on the inner circumferential surface of the pipe due to plastic deformation fits into the concave circumferential groove of the inner tube, the outer circumference of the pipe made of a material that is easily broken when subjected to a large force, such as a composite pipe Even if a concave groove is formed on the surface by plastic deformation, there is no possibility of cracking or cracking. Therefore, it is possible to reliably perform a strong connection without destroying the fragile pipe.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
The pipe joint according to the present invention includes a joint main body 13 into which the pipe 12 to be connected is inserted, and a screw member having a hole 25 into which the pipe 12 is inserted and screwed into the joint main body 13. . Moreover, the joint body 13 includes an insertion tube portion 36 that is inserted into the pipe 12 as shown in FIGS. 11 and 12.
1, 2, 8, and 9 illustrate the case where the insertion tube portion 36 of FIGS. 11 and 12 does not exist, FIG. 1, FIG. 2, FIG. 8, and FIG. 3, 4, 5, 6, and 7, which are described as reference examples deeply related to the present invention and that show the main parts of the constituent members as one embodiment of the present invention, will be described first.
1 to 9, the pipe joint C includes a joint body 13 having a male screw portion 19 and a screw member (cap nut 5) to be screwed to the male screw portion 19.
Specifically, the cap nut 5 has a hole 25 into which the pipe 12 (for connection) is inserted.
25 includes an insertion hole portion 27 formed on the rear portion 25 a side of the cap nut 5 and into which the pipe 12 is inserted, a circumferential step portion 28 formed at the front edge of the insertion hole portion 27, and the circumferential step portion 28. A tapered portion 6 formed in an enlarged shape on the front portion 25b side, and a female screw portion formed on the front portion 25b and screwed to the male screw portion 19 of the joint body 13
18
Here, the direction in which the cap nut 5 is screwed to the joint body 13 in the direction of the axis L of the pipe 12 is defined as the front F.

The joint body 13 has a hole 16 into which the pipe 12 is inserted, and a sealing material such as an O-ring is provided in the hole 16.
A holding groove portion 20 for holding 17 is formed, and the joint body 13 has a tapered outer surface portion 23 that abuts against the tapered portion 6 of the cap nut 5 when the screwing is completed on the outer peripheral surface of the rear portion.
In addition, although this joint main body 13 has shown only one part (in the cross section) (in FIG. 1, FIG. 2), the whole of this joint main body 13 is various, such as a straight, an elbow, cheese, a socket. Furthermore, a similar structure may be formed on the other end side (front F side) outside the figure.
Further, the hole 16 is formed with a circumferential abutting step portion 24 in which the tip (front end) portion 12b of the inserted pipe 12 abuts at the back portion 16a.

Furthermore, the pipe joint C includes a C-shaped retaining ring 1 having one cut 1 a on the circumference, and is disposed in the tapered portion 6 of the hole portion 25 of the cap nut 5. The outer peripheral surface 1b of the retaining ring 1 is formed in a tapered shape having the same inclination angle as that of the tapered portion 6 of the cap nut 5 (the diameter is reduced from the front side to the rear side).
The retaining ring 1 is made of a metal, stainless steel, or the like, which is made of a material that does not cause electrolytic corrosion even when it comes into contact with the pipe 12, the joint body 13, and the cap nut 5 that are inserted and fitted, and has high strength.

Further, the retaining ring 1 has a first holding female portion 31 formed near the one end 2 of the cut 1 a and is symmetrical to the first holding female portion 31 with respect to the virtual center point O of the retaining ring 1. In addition, a second holding female portion 31 is formed. Here, the leading end when the retaining ring 1 is screwed around the pipe 12 as indicated by the arrow M ₁ is defined as one end 2 and the opposite side is defined as the other end 22.
Specifically, the holding female portion 31 includes a disk-shaped large-diameter space portion 31 a formed in a hollow shape at the front and rear intermediate positions of the retaining ring 1, and an axis parallel to the axis L of the pipe 12 in the retaining ring 1. The large-diameter space portion 31a and a small-diameter hole portion 31b connected to each other are provided in the direction of the center L ₃₁ , and the large-diameter space portion 31a extends from the inner peripheral surface 1c side of the retaining ring 1 to the outer peripheral surface 1b. , Is penetrating.

A rotor 32 is held in each holding female portion 31 of the retaining ring 1 so as to be able to rotate about an axis L ₃₁ parallel to the axis L of the pipe 12.
Specifically, the rotor 32 includes a short columnar shaft portion 32b that is pivotally supported by the small-diameter hole portion 31b of the holding female portion 31, and a large-diameter space of the holding female portion 31 that is provided at the front and rear center positions of the shaft portion 32b. And a disk portion 32a that is rotatably held in the portion 31a. The outer peripheral portion of the disk portion 32a is formed in a semicircular shape (curved shape) in a longitudinal sectional view.
The rotor 32 is preferably made of a material that does not cause electrical corrosion with the retaining ring 1 or the pipe 12 and has a large strength, and is integrally formed from the same material as the retaining ring 1.
Alternatively, the rotor 32 (rather than being integrally molded) is a semicircular disc body 40 whose outer peripheral portion is semicircular in a longitudinal sectional view, and a shaft member 39 that pivotally supports a hole 40a formed at the center of the disc body 40, It may be composed of (
(Refer FIG.7 (b)). Further, the shaft member 39 may be a C-type pin (shaft) (see FIGS. 7C and 7D). Thus, when the rotor 32 can be separated, the disc body 40 is fitted into the large-diameter space portion 31a of the retaining female portion 31 of the retaining ring 1 (from the inner peripheral surface 1c side or the outer peripheral surface 1b side). Later
If the shaft member 39 is inserted into the small-diameter hole 31b and fixed by caulking or the like, the setting becomes easy.

Further, the retaining ring 1 is formed on its inner peripheral surface 1c from the one end 2 to the other end 22 with a locking ridge 33 that locks into the concave groove 4 formed on the outer peripheral surface 12a of the pipe 12. Yes. The inner peripheral portion of the locking ridge 33 has a rectangular shape in the longitudinal section.

FIG. 10 shows a modified example of the retaining ring 1. The retaining ring 1 has three holding female portions.
.., And the rotors 32 are held in the respective holding female portions 31. Specifically, the three holding female portions 31 are arranged at equal intervals in the circumferential direction between the one end 2 and the other end 22 of the retaining ring 1. The holding female portion 31 and the rotor 32 have the same configuration as that already described with reference to FIGS. In this way, two or more (plural) rotors 32 are provided at equal intervals around the circumference.

11 and 12 show an embodiment of a pipe joint according to the present invention, and this pipe joint C is a metal pipe.
12 and composite pipe 50 (resin pipe having metal layer 50a). 1 and 2
8 and FIG. 9 is different from the pipe joint C in that the joint body 13 is in contact with the inner cylindrical portion 36 that contacts the inner peripheral surface 12c of the composite pipe 50 (pipe 12) and the outer peripheral surface 12a. An external fitting tubular portion 38 in contact therewith, and
A holding groove 20 for holding a sealing material 17 such as an O-ring, and an inner peripheral surface 12c of the pipe 12 by plastic deformation
The concave circumferential groove 34 into which the gradually raised circumferential raised portion 35 is fitted is formed on the outer peripheral surface 36a of the insertion cylindrical portion 36.

13 and 14 show a pipe joint provided with a rotor 32 and a retaining ring 1 having different shapes.
The difference from that shown in FIG. 12 is that the rotor 32 has two front and rear disk portions 32a, and the retaining ring 1 has a pair of front and rear large-diameter space portions 31a and two front and rear engagements. This is a point having a stop ridge 33.
Specifically, the rotor 32 has disk portions 32a and 32a having large and small diameters 42A and 42B on the front and rear sides,
Each outer peripheral part is comprised so that it may contact | abut to the taper part 6 of the cap nut 5 simultaneously.

Next, the usage method (action) of the above-described pipe joint will be described.
First, as shown in FIGS. 5 and 6, the retaining ring 1 is attached to the tapered portion 6 of the hole 25 of the cap nut 5.
The disk portions 32 a of the rotors 32 are brought into contact with the tapered portion 6.
Then, the pipe 12 is inserted into the insertion hole 27 of the cap nut 5, the inner peripheral surface 1 c of the retaining ring 1 and the hole 16 of the joint body 13, and the tip 12 b of the pipe 12 is inserted into the joint body 13. It is made to contact | abut to the step part 24 for contact | abutting of the hole 16, and it will be in the state of FIG.

1 and 6, the cap nut 5 is screwed into the joint body 13 in the direction of the arrow M ₅ (around the right screw).
At this time, the retaining ring 1 is in contact with the rear end face (tip face) 13a of the joint body 13, and the arrow M _{1 in the} same rotational direction as the arrow M ₅ is moved around a fixed position of the outer peripheral face 12a of the pipe 12. In the direction of
Rotate. At the same time, the disk portion 32a of the rotor 32, while rotating in the direction of the arrow M ₃₂ in the same rotational direction as the arrow M _5, while sliding the tapered portion 6 of the cap nut 5 to the reduced diameter (rear side), Revolve around 12 pipes. As indicated by the sizes of the arrows M ₁ and M ₅ , the rotation of the retaining ring 1 is smaller than the rotation of the cap nut 5.
Thus, the stop ring 1, around the position of the pipe 12, while rotating in the direction of the arrow M _1, gradually so gradually reduced in diameter, the rotor 32 ... is, arrows axis L ₃₁ around While rotating in the direction of M _32, an annular groove 4 is formed on the outer peripheral surface 12a of the pipe 12 by plastic deformation.
The screwing operation may be performed manually or using a tool such as a pipe wrench.

Then, as shown in FIGS. 2, 8 and 9, if the cap nut 5 is screwed until the retaining ring 1 contacts the step portion 28 of the cap nut 5, the screwing is completed. At this time, the retaining ring 1 is reduced in diameter, and the locking ridge 33 is fitted into the concave groove 4 of the pipe 12 and locked. Further, the retaining ring 1 is firmly attached to the stepped portion 28 of the cap nut 5 and the rear end surface 13a of the joint body 13.
The concave groove 4 has a semicircular shape corresponding to the disk portion 32a of the rotor 32 in the longitudinal section, so that the locking projection 33 (at the inner peripheral end of the rectangular shape) is securely locked ( (See FIG. 9).
Therefore, the pipe 12 is firmly connected to the pipe joint C without coming out of the pulling force.
Further, according to the retaining ring 1 shown in FIG. 10, the three rotors 32.
And the outer peripheral surface 12 a of the pipe 12, the outer peripheral surface of the pipe 12 is engaged with the cap nut 5.
The concave groove 4 can be reliably formed in 12a, the retaining ring 1 is uniformly reduced in diameter, and the screwing of the cap nut 5 becomes very smooth.

Further, in the pipe joint shown in FIGS. 11 and 12, the insertion tube portion 36 of the joint body 13, the insertion hole 27 of the cap nut 5, the inner peripheral surface 1c of the retaining ring 1, the joint body 13 The external fitting cylinder part 38, and the insertion hollow part 44
The pipe 12 (composite pipe 50) is inserted into the insertion hollow part 44 and brought into contact with the rear abutting part 44a.
When the cap nut 5 is screwed onto the joint body 13 (similar to the pipe joint C shown in FIGS. 1 to 9), the rotor 32 is formed into an annular recess on the outer peripheral surface 12a of the pipe 12 by plastic deformation. The groove 4 is formed, and the raised portion 35 is fitted into the recessed circumferential groove 34 of the insertion tube portion 36 of the joint body 13 while the circumferential raised portion 35 is gradually raised on the inner peripheral surface 12 c of the pipe 12. Go. Then, the retaining ring 1 is screwed until it comes into contact with the stepped portion 28 of the cap nut 5, and the screwing is completed when the state shown in FIGS. 11 and 12 is reached. The pipe 12 is fitted in the concave groove 4 and is locked.

Further, in the pipe joints shown in FIGS. 13 and 14, when the cap nut 5 is screwed, the outer peripheral surface of the pipe 12
A deep circumferential groove 4A and a shallow circumferential groove 4B are formed in 12a, and a large-diameter locking ridge 33 and a small-diameter locking ridge 33 of the retaining ring 1 are respectively engaged. Stop. Therefore, the pipe 12 is firmly connected to the pipe joint C without coming out of the pulling force.

As described above, the pipe joint according to the present invention includes the joint body 13 into which the pipe for connection 12 is inserted,
A pipe member 12 having a hole 25 into which the pipe 12 is inserted and a screw member that is screwed into the joint body 13; and the joint body 13 includes an insertion tube portion 36 that contacts the inner peripheral surface 12c of the pipe 12. A C-shaped retaining ring 1 that is disposed in the taper portion 6 of the hole portion 25 of the screwing member and has one cut 1a on the circumference;
And a rotor 32 that is rotatably held by the retaining ring 1 and that forms a circumferential concave groove 4 on the outer peripheral surface 12a of the pipe 12 by plastic deformation, and the insertion tube portion 36 has an outer peripheral surface. 36a is formed with a concave circumferential groove 34 into which the circumferential raised portion 35 that is raised on the inner peripheral surface 12c of the pipe 12 by plastic deformation is formed. Since the diameter of the ring 1 is reduced and the rotor 32 plastically deforms and locks the concave groove 4, the pipe 12 is securely connected to the pipe joint, and there is no possibility that the pipe 12 is unexpectedly pulled out after construction.
Further, since the groove 4 is formed by plastic deformation, chips are not generated from the pipe 12, the screwing member can be smoothly screwed, work is easy, and it can be performed at various places. Pipe connections can be made.
Further, composite pipes can be connected, and can be used for connecting various types of pipes 12.
And, since the circumferential raised portion 35 that rises on the inner circumferential surface 12c of the pipe 12 by plastic deformation fits into the concave circumferential groove 34 formed on the outer circumferential surface 36a of the insertion cylindrical portion 36, like a composite pipe, Even if the concave groove 4 is formed by plastic deformation on the outer peripheral surface 12a of the pipe 12 made of a material that is easily broken when subjected to a large force, there is no possibility of cracking or cracking. Therefore, a strong connection can be reliably performed without destroying the composite pipe.

In addition, the joint main body 13 into which the pipe for connection 12 is inserted, and a screw member having a hole 25 into which the pipe 12 is inserted and screwed into the joint main body 13, It has an insertion tube portion 36 that comes into contact with the inner peripheral surface 12c of the pipe 12, has a single cut 1a on the circumference, and has a hole 25 in the screw member.
Provided with a C-shaped retaining ring 1 disposed in the tapered portion 6, and the retaining ring 1 has a holding female portion 31 penetrating from the inner peripheral surface 1 c to the outer peripheral surface 1 b, In addition, the rotor 32 is rotatably held in the holding female portion 31 and abuts against the taper portion 6 of the hole portion 25 of the screw member, and the circumferential groove 4 is formed on the outer peripheral surface 12a of the pipe 12 by plastic deformation. And the insertion tube portion 36 has an outer peripheral surface.
A concave circumferential groove 34 into which a circumferential raised portion 35 that rises on the inner peripheral surface 12c of the pipe 12 is fitted in 36a.
However, when the screwing member is screwed into the joint body 13, the retaining ring 1 is reduced in diameter, and the rotor 32 is plastically deformed and locked in the groove 4, so that the pipe 12 is It is securely connected to the pipe joint and there is no risk of accidental disconnection after construction. Further, during this screwing, the rotor 32 abuts against the tapered portion 6 of the hole 25 of the screwing member and rolls (rotates), so that the rotational torque of the screwing member is very small. Therefore, the screwing member can be easily fastened to the retaining ring 1 and is not particularly troublesome, so that the connection work by screwing can be performed quickly and smoothly.
Further, since the groove 4 is formed by plastic deformation, chips are not generated from the pipe 12, the screwing member can be smoothly screwed, work is easy, and it can be performed at various places. Pipe connections can be made.
Further, composite pipes can be connected, and can be used for connecting various types of pipes 12.
And, since the circumferential raised portion 35 that rises on the inner circumferential surface 12c of the pipe 12 by plastic deformation fits into the concave circumferential groove 34 formed on the outer circumferential surface 36a of the insertion cylindrical portion 36, like a composite pipe, Even if the concave groove 4 is formed by plastic deformation on the outer peripheral surface 12a of the pipe 12 made of a material that is easily broken when subjected to a large force, there is no possibility of cracking or cracking. Therefore, a strong connection can be reliably performed without destroying the composite pipe.

Further, the retaining ring 1 has a locking ridge 33 that is locked to the circumferential groove 4 on its inner peripheral surface 1c.
Therefore, when the screwing member is screwed into the joint body 13, the retaining ring 1 is reduced in diameter, and the locking ridge 33 is fitted into the concave groove 4 formed by the rotor 32, so that Lock. Therefore, the pipe 12 is securely connected to the pipe joint, the pull-out preventing force becomes extremely large, and there is no possibility that the pipe 12 is unexpectedly pulled out after the construction.

It is a cross-sectional side view of the reference example for demonstrating the pipe joint which concerns on this invention. It is a cross-sectional side view. It is an enlarged front view which shows the retaining ring holding a rotor. It is AA expanded sectional drawing of FIG. It is a partial cross section enlarged side view which shows a cap nut and a retaining ring. It is BB sectional drawing of FIG. It is an enlarged view showing a rotor, (a) is an enlarged side view, (b) is an enlarged sectional side view of another rotor, (c) is an enlarged sectional side view of still another rotor, (D) is a cross-sectional view of the main part of (c). It is a principal part expanded sectional side view. It is a principal part expanded sectional side view. It is an enlarged front view which shows the modification of a retaining ring. It is a section side view showing an embodiment of a pipe joint concerning the present invention. It is a principal part sectional side view. It is a principal part expanded sectional side view which shows the pipe joint which has another rotor. It is a principal part expanded sectional side view.

DESCRIPTION OF SYMBOLS 1 Stop ring 1a Cut | interruption 1b Outer peripheral surface 1c Inner peripheral surface 4 Concave groove 6 Tapered part
12 pipes
12a outer peripheral surface
12c Inner peripheral surface
13 Fitting body
25 holes
31 Holding female part
32 rotor
33 Locking ridge
34 Concave groove
35 Raised
36 Insertion tube
36a Outer peripheral surface C Pipe fitting

Claims (2)

A joint body (13) into which the pipe (12) to be connected is inserted, a screw member having a hole (25) into which the pipe (12) is inserted and screwed into the joint body (13); In the pipe joint, the joint body (13) has an insertion tube portion (36) that comes into contact with the inner peripheral surface (12c) of the pipe (12).
A C-shaped retaining ring (1) having one cut (1a) in the circumference and disposed in the tapered portion (6) of the hole (25) of the screw member; the outer peripheral surface of the ring (1) capable of rotating held and pipe (12) and the rotor (32) to (12a) a circumferential groove (4) is formed by plastic deformation, comprising a, and, in the outer circumferential surface of the挿筒portion (36) to (36a), the inner peripheral surface of the pipe (12) by the plastic deformation circumferential ridges raised (12c) (35) is fits concave peripheral groove (34) Is formed ,
Furthermore, the pipe joint characterized by having the latching protrusion (33) latched to the said circumferential groove (4) in the internal peripheral surface (1c) of the said retaining ring (1) . A joint body (13) into which the pipe (12) to be connected is inserted, a screw member having a hole (25) into which the pipe (12) is inserted and screwed into the joint body (13); In the pipe joint, the joint body (13) has an insertion tube portion (36) that comes into contact with the inner peripheral surface (12c) of the pipe (12).
A C-shaped retaining ring (1) having a single cut (1a) on the circumference and disposed in the tapered portion (6) of the hole (25) of the screw member;
The retaining ring (1) has a holding female portion (31) penetrating from the inner peripheral surface (1c) to the outer peripheral surface (1b),
In addition, it is rotatably held in the holding female portion (31) and abuts on the taper portion (6) of the hole (25) of the screw member and has a circumferential shape on the outer peripheral surface (12a) of the pipe (12). the groove (4) the rotor (32) which is formed by plastic deformation, comprising, and, on the inside挿筒portion outer peripheral surface of (36) (36a), by the plastic deformation the pipe (12) A concave circumferential groove (34) into which a circumferential raised portion (35) protruding on the inner circumferential surface (12c) is fitted is formed ,
Furthermore, the pipe joint characterized by having the latching protrusion (33) latched to the said circumferential groove (4) in the internal peripheral surface (1c) of the said retaining ring (1) .

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