JP3029189B2 - Tube connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting structure, and more particularly to a pipe connecting structure capable of securely connecting a pair of pipes without detaching them.

[0002]

2. Description of the Related Art Conventionally, as a connecting structure of such a tubular body,
For example, there is a device described in Japanese Utility Model Publication No. 51-151230.

That is, in this prior art, as shown in FIG. 8, a plurality of wedges 15 internally mounted on a press ring 14 at a predetermined interval are moved in the tube axis direction by screwing a bolt 16 together with the press ring 14. Using the inner peripheral taper surface 17 of 14, the inner peripheral surface is moved in the radial direction, and a pair of front and rear protrusions 18 formed on the inner peripheral surface are connected to the tube B ′.
And the one pipe A 'and the other pipe B' are connected to each other.

[0004]

However, in the above-mentioned prior art, a push ring 14 which is separate from the tube A 'is employed, and the push ring 14 is attached to the push ring 14 at a predetermined interval. Since the tubular body B 'is partially held by the narrow wedge body 15 as described above, it has the following problems.

[0005] That is, when a fluid is circulated from one tube A 'side to the other tube B', the other tube B 'receives the water pressure and moves in a direction to separate from one tube A'. At this time, since a force is locally applied to the projection 18 on the front side of the wedge body 15, the wedge body 15 rotates and floats around the projection 18 as a fulcrum, and the bolt 16 As a result, a large shearing load is applied to the bolt 16 in contact with the insertion hole 19, so that the bolt 16
However, there is a serious problem that the two pipes A 'and B' are detached due to breakage, and have not been put to practical use.

On the other hand, although it is possible to increase the outer diameter of the bolt 16, this configuration makes it possible to increase the outer diameter of the pressing wheel 14.
Also, it is necessary to secure the size of the wedge body 15, which causes a new problem of increasing the overall size.

[0007] Therefore, the present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to make it possible to reliably and firmly connect a pipe without detaching the pipe.

[0008]

In order to solve the above-mentioned problems, the present invention is characterized in that a plurality of hollow bulging portions 1 bulging in a radial direction are formed at an end portion and a bulging portion is formed. 1 rear wall
The pipe A is provided with a long hole 2 in the radial direction in 1a, and a tapered groove 3 provided on the inner peripheral surface between the bulging portions 1 and having a diameter decreasing toward the end, and connected to the inner peripheral surface. The outer peripheral surface of the other tubular body B to be cut has a protrusion 5 which can be cut into the outer peripheral surface, and is housed in the bulging portion 1 of the tubular body A on the tapered outer peripheral surface engaging with the tapered groove 3 of the tubular body A. Arc-shaped push ring 4 having a projecting projection 8 formed thereon, and a screw rod inserted into the elongated hole 2 of the tubular body A and screwed into a screw hole 7 formed in the projection 8 of the pushing ring 4. 9.

In this case, the screw rod 9 may be formed integrally with the pressing ring 4 and the screw rod 9 may be protruded from the rear surface of the convex portion 8 as in the second embodiment.

Therefore, in the connection structure characterized by the above-described configuration, first, another tube B is inserted into the end of the tube A, and then the screw rod 9 is screwed into the screw hole 7 of the press ring 4. If the continuation is continued, for example, when the tip of the screw rod 9 comes into contact with the inner wall of the bulging portion 1 and the movement of the screw rod 9 is prevented, the pressing ring 4 moves toward the end of the tube A. However, since the tapered outer peripheral surface of the press wheel 4 receives a pressing force by the tapered groove 3 of the tubular body A and is reduced in diameter, the protrusion 5 cuts into the outer peripheral surface of another tubular body B. The two tubes A and B are reliably connected.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, A indicates one of the tubes provided with a plurality of hollow bulging portions 1 at the ends thereof at predetermined intervals on a concentric circle. A long hole 2 is formed in the rear wall 1a in the radial direction. Reference numeral 3 denotes a tapered groove formed on the inner peripheral surface between the bulging portions 1 so as to decrease in diameter toward the end. The tapered groove 3 includes a first tapered portion 3a and a first tapered portion as shown in FIG.
2nd on the end side where the inclination angle with respect to the pipe axis is slightly smaller than 3a
And a tapered portion 3b.

4 has an inner peripheral surface formed as shown in FIG. A taper groove 3
FIG. 2 shows an arc-shaped pressing ring having a tapered outer peripheral surface that engages with a convex portion 8 having a screw hole 7 at the center of the outer peripheral surface. The radius of curvature is tube B
Is slightly larger than the outer diameter of the convex portion 8.
Are housed in the bulging portion 1 of the tube A.

In this embodiment, four push wheels 4 are provided.
The outer peripheral surface of the other tubular body B is configured to be held over substantially the entire circumference, and the inclination angle of the outer peripheral surface of the pressing ring 4 is different from that of the second tapered portion 3b of the tapered groove 3 of the tubular body A. Set at the same angle.

Reference numeral 9 denotes a bolt as a threaded rod which is inserted into the elongated hole 2 of the bulging portion 1 of the tubular body A and screwed into the screw hole 7 of the press ring 4. When the outer surface of the wall 1 a comes into contact with the outer surface of the wall 1 a, the tip of the screw portion 9 b is configured to contact the inner wall surface of the bulging portion 1.

Reference numeral 10 denotes a packing for sealing, which is provided inside a concave groove 11 provided inside the bulging portion 1 of the tubular body A, and a convex portion 12 is formed on an inner peripheral surface of the concave groove 11. It is projected in the direction.

The present embodiment has the above configuration.
When connecting another pipe B to this, it is performed as follows.

First, a predetermined amount of the tube B is inserted into the end of the tube A. At this time, the threaded rod 9 is pushed into the tube A as shown in FIGS. Is moved inside the bulging portion 1, the tube B can be easily inserted without contacting the protrusion 5 of the pressing ring 4.

Thereafter, when a rotational force is applied to the screw rod 9, the tip end and the head 8a of the screw rod 9 are moved to the inner wall surface and the rear wall surface of the bulging portion 1, respectively.
Since it is in contact with 1a, the screw rod 9 does not move any further in the tube axis direction, and the pressing ring 4 moves toward the rear wall 1a of the bulging portion 1.

In this case, the tapered outer peripheral surface of the pressing wheel 4 is engaged with the first and second tapered portions 3a and 3b of the tapered groove 3 of the tube A, and the bulging portion through which the screw rod 9 is inserted. Since the long hole 2 of the rear wall 1a is formed in the radial direction, the pressing ring 4 receives an inward pressing force by the movement of the pressing ring 4, and the diameter thereof is reduced. Is moved radially inward, and the protrusion 5 of the pressing wheel 4 bites into the outer peripheral surface of the tube B, and the two tubes A and B are connected as shown in FIGS. 3 (a) and 5 (b).

Further, since the screw rod 9 is disposed in the pipe axis direction, if a ratchet or the like is used, for example, it is possible to easily and surely apply a rotational force to the screw rod 9, which is very convenient in operation. .

Thus, the connecting operation of the pipes A and B is completed. However, when a fluid is thereafter passed from the pipe A to the pipe B, the pipe B receives the water pressure and the pipe B receives the hydraulic pressure shown in FIG. As shown in (c), it moves in the direction away from the tube A.

Then, the pressing ring 4 is further subjected to an inward pressing force by the second tapered portion 3b of the tapered groove 3 of the tube A, and the projection 5 is deeply cut into the outer peripheral surface of the tube B. Since the tubular body B is held over substantially the entire circumference by the projections 5 of the arc-shaped portion 6 of the pressing wheel 4, the applied external force is substantially evenly distributed to each pressing wheel 4, so that the pressing wheel 4 rotates. As a result, the connection between the two tubes A and B is reliably and firmly maintained.

Further, since such external force does not act on the screw rod 9 itself, it is not necessary to secure the strength of the screw rod 9 and the bulging portion 1 more than necessary, and the whole is made compact. There is also an advantage that it can be configured.

Further, in this embodiment, since the pressing ring 4 is formed so as to be housed in the tube A itself, the number of parts can be reduced, the whole structure can be simplified, and it can be manufactured at low cost. There is also the advantage that you can.

In the above-described embodiment, the pressing ring 4 and the screw rod 9 are formed separately, but they may be formed integrally as shown in FIG. That is, a threaded rod 9 that can be inserted into the elongated hole 2 of the tube A is protrudingly provided on the back surface of the convex portion 8 of the pressing wheel 4, and a nut 13 is screwed to the tip thereof.

The protrusions 5 of the pressing wheel 4 do not need to be provided over the entire inner peripheral surface as in the above-described embodiment. For example, as shown in FIG. 7, one protrusion 5 is formed only at the center and both ends. It does not matter. In this case, it is mounted on the tube A so that one protrusion 5 is located inside.

In addition, the shape of the bulging portion 1 of the tube A and the specific shape of the tapered groove 3 can be freely changed within the range intended by the present invention.

[0029]

Since the present invention has the above-described configuration, the other pipe is held substantially all around by the protrusion of the arc-shaped pressing ring, and even if the pipe receives external force due to water pressure or the like. The external force is evenly distributed to each pressing wheel, and the external force is locally applied to the pressing wheel and the pressing wheel rotates around the projection as a fulcrum, as in the conventional device that partially holds the tubular body. As a result, a special effect of reliably maintaining a good connection between the two tubes has been obtained.

Further, since such external force is not directly applied to the threaded rod, it is not necessary to secure the strength of the threaded rod or the bulging portion of the tube, so that the whole can be made compact and inexpensive manufacturing is possible. Also has a practical effect.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing an embodiment of the present invention.

FIG. 2 is a side view of the same half-cut.

FIGS. 3A and 3B are enlarged cross-sectional views of a main part.

FIG. 4 shows an embodiment of a pressing wheel, (a) is a front view, (b)
Is a bottom view.

FIGS. 5A to 5C are enlarged sectional views of a main part showing a use state.

6A and 6B show another embodiment, wherein FIG. 6A is a front view of a pressing wheel including a partial cross section, and FIG. 6B is a front view including a partial cross section showing a used state.

FIG. 7 shows another embodiment of the pressing wheel, (a) is a front view,
(B) is a bottom view.

FIG. 8 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Swelling part 1a ... Back wall 2 ... Long hole 3 ... Tapered groove 4 ... Pressing ring 5 ... Projection 7 ... Screw hole 8 ... Convex part 9 ... Screw rod 13 ... Nut A ... Tube B ... Tube

Claims (3)

(57) [Claims] 1. A hollow bulging portion bulging radially at an end.
A plurality of (1) are formed, a long hole (2) is formed in the rear wall (1a) of the bulging portion (1) in the radial direction, and an end is formed on an inner peripheral surface between the bulging portions (1). Tube with tapered groove (3) that decreases in diameter toward the part
(A) and a projection (5) that can be cut into the outer peripheral surface of another tube (B) to be connected to the inner peripheral surface, and the tapered groove of the tube (A)
(3) The bulging portion of the tubular body (A)
(1) An arc-shaped push ring (4) provided with a protruding portion (8) housed therein, and a push ring (4) inserted into the elongated hole (2) of the tubular body (A).
And a screw rod (9) screwed into a screw hole (7) formed in the convex portion (8) of the tube. 2. A hollow bulge bulging radially at an end.
A plurality of (1) are formed, a long hole (2) is formed in the rear wall (1a) of each bulging portion (1) in the radial direction, and an inner peripheral surface between each bulging portion (1) is formed. A pipe with a tapered groove (3) that decreases in diameter toward the end
(A) and a projection (5) that can be cut into the outer peripheral surface of another tube (B) to be connected to the inner peripheral surface, and the tapered groove of the tube (A)
(3) The bulging portion of the tubular body (A)
(1) An arc-shaped pressing wheel (4) provided with a protruding portion (8) housed therein, and the tubular body protruding from the rear surface of the protruding portion (8) of the pressing ring (4). (A) A connecting structure for a tubular body, comprising: a nut (13) screwed into a screw rod (9) inserted into a long hole (2). 3. The pipe connecting structure according to claim 1, wherein said projections (5) are provided over the entire inner peripheral surface of the pressing wheel (4).