JPS6229746Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe joint device, for example, one that connects a relatively large-diameter rigid connecting pipe made of metal or the like and a flexible pipe made of synthetic resin or the like.

Various pipe joint devices of this type have been proposed in the past, but most of the existing ones connect relatively small-diameter connecting pipes, and this small-diameter connecting device can be used as is for large-diameter pipe fittings. However, there are many problems in using it as a connection device for pipe bodies.

This idea was created in view of these points.
The fitting and overlapping portion of the connecting tube body and the flexible tube body is covered with a plurality of split ring bodies having connecting pieces at both ends and having a tapered engagement surface on the inner surface, which constitute a tightening ring body when assembled. The object of the present invention is to provide a pipe joint device that can tightly, simply and reliably connect a connecting pipe body and a pipe body by fitting the divided ring bodies together and joining the respective connecting pieces by overlapping each other.

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes a connecting tube body made of a rigid body such as metal and having a relatively large diameter.A plurality of annular concave steps 2 are formed on the outer periphery of the connecting tube body 1 in the axial direction. A tapered surface 3 is formed.

Reference numeral 4 denotes a tube that fits into the connecting tube 1, and the tube 4 is made of a flexible member such as synthetic resin, rubber, or synthetic rubber.

Reference numeral 5 denotes a ring body made of a rigid body such as metal, and the length of this ring body 5 is longer than the length of the annular recessed step portion 2 of the connecting tube body 1.

However, the ring body 5 of the lever is composed of a plurality of divided ring bodies 6 that constitute the ring body at the time of composition.

Each of the divided ring bodies 6 is formed in an arcuate shape, and a connecting piece 7 is formed at both ends thereof to protrude outward, and each connecting piece 7 is formed with an insertion hole 8. Further, the inner surface of each split ring body 6 has an engaging surface 9 with a tapered cross section that slopes from one end to the other end, that is, from the insertion direction of the tube body 4 to the direction of contraction toward the connection tube body 1 side. It is formed in The opposing surfaces of each connecting piece 7 of each split ring body 6 are formed of smooth surfaces 10 so as to come into surface contact when they overlap each other, and each insertion hole 8 is bored at a position where they communicate when they overlap. It is set up.

Then, the connecting pieces 7 of each split ring body 6 are arranged oppositely, and the bolt 11 is inserted into the opposing insertion hole 8, and the nut 12 is screwed onto the bolt 11. Connect so that it can expand and contract.

In this structure, when connecting the connecting tube 1 made of metal or the like and the flexible tube 4, the ring 5 is loosely fitted in advance to the outer periphery of one side of the connecting tube 1. I'll keep it.

Next, as shown in FIG. 1, one end of the tube 4 is fitted into one end of the connection tube 1, and the end edge _4a is pushed to a deep position in the annular recessed part 2 of the connection tube 1. insert.

Next, the ring body 5 that has been loosely fitted into the connecting pipe body 1 in advance is moved to position it on the annular recessed part 2 into which the pipe body 4 is fitted, and each of the divided ring bodies 6 that constitute the ring body 5 is moved. The bolts 11 and nuts 12 connecting the connecting pieces 7 are tightly tightened.

As a result, a ring body 5 formed by each split ring body 6
is reduced in diameter, and the fitting portion of the tubular body 4 is forcibly pushed into the annular recessed step portion 2 by the engaging surface 9 of each segmented ring body 6 of the annular body 5, and the diameter of the tubular body is reduced. 4 is the connecting pipe body 1
It is tightly engaged with the edge outer circumferential portion _1a of.

Next, when fluid flows from the connecting tube 1 side to the tube 4 side in this connected state, the pressure is applied to the end of the tube 4, and the tensile force causes the tube 4 to move to the connecting tube 4 side.
When the annular body 5 is pulled in the opposite direction to the tube body 4, the annular body 5 acts in cooperation with the tube body 4 and is still attached to the tube body, since the ring body 5 is not fixed by any other force. It is moved to the 4 side and tightened, so the more internal pressure is applied, the more tightened it becomes. In addition, when the fitting portion of the tube body 4 is subjected to an action that bulges outward due to internal pressure, the length of the ring body 5 becomes longer than the length of the annular recessed step portion 2 of the connecting tube body 1. Since it extends beyond the edge outer circumferential portion 1 _a to the vicinity of the tapered surface 3 , the bulging portion of the tube 4 is frictionally coupled to the tapered engagement surface 9 on the inner side due to its internal pressure. Therefore, the connected state can be maintained reliably without coming off during use.

In the above embodiment, the engagement surface 9 having a tapered cross section formed on the inside of each segmented ring body 6 constituting the ring body 5 was described as being formed from one end to the other end. 9, as shown in FIG. 3, the part corresponding to the annular recessed step 2 is an engagement surface 9 _a with a tapered cross section, and the part corresponding to the outer peripheral edge 1 _a of the connecting pipe body 1 is a flat cross section. The engagement surface _9b may also be formed. By configuring in this way, the frictional connection is more securely achieved, and due to the tightening, there is no fear that it will come off during use.

In the embodiment described above, the connecting tube 1 may be a member that connects the tubes 4 together, or may be one end fixed to another device and the tube 4 connected to the other end. It may be hot.

According to the present invention, the bolts and nuts that are located on the annular recessed part of the connecting tube and connect the divided ring bodies are fastened to the flexible tube that is inserted into the connecting tube. As a result, the inner diameter of the annular body is gradually reduced, and due to its flexibility, the tubular body is forcibly inserted into the annular recessed step. It can be tightly connected to the connecting pipe body easily and reliably. In addition, even if a tensile force is applied to this connecting part, the inner surface of the plurality of split ring bodies is formed with a tapered engagement surface that slopes from the insertion direction of the tube body toward the connecting tube body side. Together with the tightening of the body, the tube body and the connecting tube body are firmly connected by a large frictional connection, and there is no fear that they will come apart, and the connection can be maintained reliably at all times. In addition, the ring body is composed of a plurality of divided ring bodies, and the pipe bodies can be connected and separated by a simple operation of expanding and contracting the inner diameter by tightening and loosening bolts and nuts, so it has excellent operability. On-site work is extremely easy, and since the ring is formed in sections, smaller split ring bodies can be formed individually compared to the case where large-diameter ring bodies are formed in one piece, which improves productivity and makes handling and transportation to the site easier. It's easy.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing one embodiment of the pipe coupling device of the present invention, Fig. 2 is a side view of the same ring body, and Fig. 3 is a part of the pipe coupling device of another embodiment. FIG. DESCRIPTION OF SYMBOLS 1... Connection pipe body, 2... Annular recessed step part, 4... Pipe body, 5... Ring body, 6... Division ring body, 7... Connecting piece, 9... Engaging surface, 11, 12 ...Boruto Natsuto.

Claims (1)

[Scope of utility model registration request] A connecting pipe body having an annular recessed step formed on the outer periphery of the connecting part, a pipe body formed of a flexible member having a diameter that fits on the outer periphery of the connecting part of the connecting pipe body, and the above connecting pipe body. It has connecting pieces located on and engaged with the annular recessed part of the connecting tube body and connected to each other with bolts and nuts at both ends, and the inner surface of which the tube body is fitted. 1. A pipe joint device comprising a plurality of split ring bodies having a tapered engagement surface inclined in a direction in which the diameter decreases from the insertion direction toward the connecting pipe body side, and forming a tightening ring body when assembled.