JP4476262B2 - 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, A pipe that is configured not to be pulled out in the axial direction is known (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.

  Therefore, 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 fear 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. A C-shaped retaining ring disposed in the tapered portion of the hole portion of the screw member, and having a single cut in the circumference, and is rotatably held by the retaining ring; A rotor that forms a circumferential groove on the outer peripheral surface of the pipe by plastic deformation, and a locking ridge portion that locks the circumferential groove on the inner peripheral surface of the retaining ring. , Have.

The pipe joint according to the present invention includes a joint body into which the 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. And a C-shaped retaining ring disposed in the tapered portion of the hole of the screw member, the retaining ring penetrating from the inner peripheral surface to the outer peripheral surface. The holding female portion is held in the holding female portion so as to be able to rotate and abuts on the tapered portion of the hole of the screw member, and a circumferential groove is formed on the outer peripheral surface of the pipe by plastic deformation. A rotor to be formed is provided , and a locking ridge portion that locks in the circumferential groove is provided on the inner peripheral surface of the retaining ring.

The upper Symbol fitting body has a挿筒portion in which contact with the inner peripheral surface of the pipe.

The present invention has the following remarkable effects.
When the screw member is screwed into the joint body, the retaining ring shrinks in diameter, so that the locking protrusion is fitted into the concave groove (formed by the rotor) and securely locked. .
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.
During this screwing, the rotor revolves while rotating (self-rotating) in contact with the taper portion of the screwing member, so the rotational torque for screwing is very small. Also, setting the retaining ring is easy and does not take much time, so the work can be performed quickly and smoothly.
In addition, since the groove is formed by plastic deformation, chips are not generated from the pipe, and the screw can be smoothly screwed in, making the work easy and connecting various places and pipes. Convenient to do.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
The pipe joint C 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. .
1 to 9 show an embodiment of a pipe joint according to the present invention. A pipe joint C includes a joint body 13 having a male screw portion 19 and a cap nut 5 (screw member) screwed to the male screw portion 19. And comprising.
Specifically, the cap nut 5 has a hole portion 25 into which the pipe 12 (for connection) is inserted. The hole portion 25 is formed on the rear portion 25a side of the cap nut 5 and the pipe 12 is inserted therein. Insertion hole portion 27, a circumferential step portion 28 formed at the front edge of the insertion hole portion 27, a taper portion 6 formed in an enlarged diameter from the circumferential step portion 28 toward the front portion 25b, and a front portion And a female screw portion 18 formed in 25b and screwed onto the male screw portion 19 of the joint body 13.
Here, in the direction of the axis L of the pipe 12, a direction in which the cap nut 5 as a screwing member is screwed to the joint body 13 is defined as a front F.

The joint body 13 has a hole portion 16 into which the pipe 12 is inserted, and a holding groove portion 20 that holds a sealing material 17 such as an O-ring is formed in the hole portion 16. The outer peripheral surface has a tapered outer surface portion 23 that comes into contact with the tapered portion 6 of the cap nut 5 when the screwing is completed.
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 is good also to comprise (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). After that, 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 modification of the retaining ring 1. The retaining ring 1 has three holding female portions 31, and the rotor 32 is held in each holding female portion 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 another embodiment of the pipe joint according to the present invention. This pipe joint C is used for the metal pipe 12 and the composite pipe 50 (resin pipe having the metal layer 50a). used. 1 to 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. A holding groove portion 20 that has an outer fitting cylinder portion 38 and holds the sealing material 17 such as an O-ring, and a circumferential raised portion 35 that gradually rises on the inner circumferential surface 12c of the pipe 12 by plastic deformation. The circumferential concave groove 34 is a point formed on the outer peripheral surface 36 a of the insertion tube portion 36.

FIGS. 13 and 14 show a pipe joint provided with a rotor 32 and a retaining ring 1 having different shapes, and the difference from that shown in FIGS. 1 to 9 is that the rotor 32 has two front and rear rotors. The retaining ring 1 includes a disk portion 32a, and the retaining ring 1 includes a pair of front and rear large-diameter space portions 31a and two rows of front and rear locking protrusions 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, and the outer peripheral portions of the rotor 32 are in contact with the tapered portion 6 of the cap nut 5 at the same time. Configured.

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 disposed in the tapered portion 6 of the hole 25 of the cap nut 5, and the disk portions 32 a of the rotor 32. Make contact.
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. Rotate in the direction of. 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, since the three rotors 32 abut against the hole 25 of the cap nut 5 and the outer peripheral surface 12a of the pipe 12, as the cap nut 5 is screwed, The concave groove 4 can be reliably formed in the outer peripheral surface 12a of the pipe 12, and the retaining ring 1 is uniformly reduced in diameter, so that the cap nut 5 is screwed very smoothly.

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 An insertion hollow portion 44 is formed from the outer fitting cylindrical portion 38, and the pipe 12 (composite pipe 50) is inserted into the insertion hollow portion 44 and brought into contact with the rear abutting portion 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 circumferential concave 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. To 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.

  13 and 14, when the cap nut 5 is screwed, a deep circumferential groove 4A and a shallow circumferential groove 4B are formed on the outer peripheral surface 12a of the pipe 12, The large-diameter engaging ridge 33 and the small-diameter engaging ridge 33 of the retaining ring 1 are engaged with each other. 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 12 to be connected is inserted, the hole 25 into which the pipe 12 is inserted, and the screw joint to be screwed into the joint body 13. And a C-shaped retaining ring 1 disposed in the tapered portion 6 of the hole 25 of the screw member, and having a single cut 1a on the circumference, and capable of rotating on the retaining ring 1. And a rotor 32 for forming the circumferential concave groove 4 on the outer peripheral surface 12a of the pipe 12 by plastic deformation. Therefore, when the screwing member is screwed into the joint body 13, the retaining ring 1 is reduced in diameter. Then, since 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 it will come off unexpectedly 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.

The pipe joint according to the present invention includes a joint 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 body 13. And a C-shaped retaining ring 1 having a single cut 1a on the circumference and disposed in the taper portion 6 of the hole 25 of the screwing member. The retaining ring 1 has an inner periphery. A holding female portion 31 penetrating from the surface 1c to the outer peripheral surface 1b is provided. The holding female portion 31 is rotatably held in the holding female portion 31 and abuts against the taper portion 6 of the hole 25 of the screwing member, and the pipe 12 Since the rotor 32 for forming the circumferential groove 4 on the outer peripheral surface 12a by plastic deformation is provided, when the screw member is screwed into the joint body 13, the retaining ring 1 is reduced in diameter so that the rotor 32 However, since the concave groove 4 is plastically deformed and locked, 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, 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, since the retaining ring 1 has a locking ridge portion 33 that engages with the circumferential groove 4 on its inner peripheral surface 1c, when the screwing member is screwed into the joint body 13, the retaining ring 1 1 is reduced in diameter, and the locking ridge 33 is fitted into the concave groove 4 formed by the rotor 32 and is securely locked. 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 construction.

  In addition, since the outer peripheral portion of the disk portion 32a of the rotor 32 is formed in a semicircular shape in a longitudinal sectional view, the inner groove of the retaining ring 1 is formed in the concave groove 4 formed by the rotor 32. The locking ridge 33 of the peripheral surface 1c is securely locked, and the pipe 12 is not pulled out in the direction of the axis L. Therefore, the pipe 12 can be reliably fixed to the pipe joint. And if the joint main body 13 is configured to have the insertion tube portion 36 that abuts against the inner peripheral surface 12c of the pipe 12, the pull-out preventing force is further increased.

It is a section side view showing one embodiment of a pipe joint concerning the present 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 cross-sectional side view which shows the other form of implementation of the pipe joint which concerns on this 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.

Explanation of symbols

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
32a disk part
33 Locking ridge
36 Insertion tube C Pipe fitting

Claims (3)

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 pipe fittings with
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; A rotor (32) that is rotatably held by the ring (1) and that forms a circumferential concave groove (4) by plastic deformation on the outer peripheral surface (12a) of the pipe (12) ;
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 pipe fittings with
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),
And it is hold | maintained so that it can rotate in this holding | maintenance female part (31), and it contact | abuts to the taper part (6) of the hole (25) of the said screwing member, and it has a circumferential depression on the outer peripheral surface (12a) of a pipe (12) A rotor (32) for forming the groove (4) by plastic deformation ,
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) . The pipe joint according to claim 1 or 2, wherein the joint body (13) has an insertion tube portion (36) that abuts against the inner peripheral surface (12c) of the pipe (12) .

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