JPH0217289A - Pipe joint - Google Patents

Abstract

PURPOSE:To enable a pipe and a collar to be separated from each other by forming the captioned joint with a first pipe having a flare on a pipe end, a second pipe, a first collar to be brought into contact with the flare, a second collar, a means for tightening the collars, and a sleeve. CONSTITUTION:In the captioned pipe joint for joining a pipe 1 and a pipe 2 together, a flare 3 widening toward the end is formed on the end portion of the first pipe 1, and the second pipe 2 is inserted into and butted to the flare 3. A collar 4 is freely movably fitted on the pipe 1 so as to be brought into contact with the flare 3 while also fitting a collar 5 on the pipe 2. A sleeve 9 having a plurality of projecting ridges which bite into the pipe 2 is fitted in between the pipe 2 and the inner face of the flare 3. The collar 4 and the collar 5 are drawn near to each other and, by inserting bolts 7 into bolt holes 6, two collars 4, 5 are tightened by means of nuts 8. As a result, there is no need for welding the collars to the pipes. Also, the sealing property of the pipe joint portion can be sufficiently ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a pipe joint for connecting two vibrators.

(Prior Art) A flange joint is a pipe joint that has been widely used in the past. In this method, flanges are welded to the ends of the pipes to be joined, and these two flanges are tightened together with bolts.

(Problem to be solved by the invention) With such conventional flange joints, it takes time and effort to weld the collar to the pipe.
Additionally, there was a problem in that the tube with the collar was bulky and transportation costs were high.

The object of this invention is to obtain a pipe joint in which the collar and the pipe are separated.

(Means for Solving Problems) The pipe joint of the present invention includes a first pipe having a flare extending toward the end thereof, and a butt with the first pipe such that the pipe end is inserted into the flare. and a second tube that is freely passed through the first tube,
a first collar that abuts the flare; a second collar that freely passes through the second pipe; a tightening means for drawing the first collar and the second collar together; and the flare portion. The sleeve is inserted into the second tube so as to be sandwiched between the inner surface of the tube and the second collar, and has a projection on the inner circumferential surface that is inserted into the second tube.

In addition, it is preferable that the peripheral surface of the center hole of the first brim forms a conical surface so as to fit the outer surface of the flare. Further, it is desirable that the bite sleeve is cut at a part of the circumference so that it can be expanded and contracted freely.

To ensure a seal at the tube connection, an annular packing can be fitted to the second tube, sandwiched between the inner surface of the flare and the biting sleeve. A connecting sleeve is fitted on the inner surface of the connecting portion of the first and second pipes, and this is attached to the first and second pipes.
It can also be glued to a lining formed on the inner surface of the second tube.

(Operation) When the collars are tightened together, the bite sleeve is pushed against the inner surface of the flare and its diameter contracts, and the protrusion bites into the outer surface of the second tube, causing the connection between the second tube and the second tube. The brim is integrated and the two tubes are connected.

(Embodiment) In FIG. 1, reference numerals 1.2 are tubes to be joined to each other, and the first tube 1 has its end expanded by cold working to form a flare 3. second nine
In #2, the tube end fits the inner surface of the flare 3, and the groove 2a is a handle.

A first collar 4 is passed through the first pipe 1, and a second collar 5 is passed through the second pipe 2 so as to be freely movable. The first brim 1 is 771. It comes into contact with the outer surface of the flare 3 and does not come off, and the circular surface of the center hole of the collar is a conical surface 5a to fit the outer surface of the flare.

A plurality of bolt holes 6 are drilled at regular intervals in each of the flanges 4 and 6, and bolts 7 are passed through these holes and nuts 8 are screwed together to tighten the two flanges together.

The second brim 4 is sandwiched between the first brim 4 and the flared inner surface.
A push-in sleeve 9 is fitted onto the tube 2 . This sleeve has a plurality of protrusions 9a formed on its inner circumferential surface, and the portion that comes into contact with the flare 3 has a conical surface 9a in accordance with the flare.
It has become b.

Therefore, when the two flanges 4 and 5 are tightened together, the sleeve 9 is pushed deep into the flare 3, its diameter is contracted, and the protrusion 9a is embedded in the second tube 2, causing the sleeve 9 to be inserted into the second tube 2. Second
The collars 5 of the pipes are integrated, and the two pipes are connected to each other.

As shown in FIG. 2, the sleeve 9 has a part of its circumference cut off so that its diameter can be contracted or expanded.

Since the peripheral surface of the center hole of the first collar 4 forms a conical surface 5a to fit the outer surface of the flare 3, it is possible to prevent the flare 3 from being deformed by expansion due to tightening.

Reference numeral 10 denotes an annular rubber gasket, which has a triangular cross section. When the collars 4, 5 are tightened together, this seal io is pressed by the biting sleeve 9 and is brought into pressure contact with the flared inner surface and the second tube 2, maintaining a seal between the two tubes 1.2.

FIG. 3 shows another embodiment, in which two pipes 1 and 2 to be joined have inner surfaces lined with a lining 11 made of hard vinyl chloride or the like. This pipe joint differs from the above embodiment in that a connecting sleeve 12 is used instead of the packing. The sleeve 12 is made of plastic of the same material as the lining 11 and is formed into a cylindrical shape. An adhesive is applied to the outer surface of the sleeve 12, and the sleeve 12 is fitted into the inner surface of the connecting portion of the two pipes 1 and 2. In this way, the sleeve 12 and the lining II are bonded with adhesive, ensuring a seal between the tubes, and at the same time preventing the tube material (metal) from coming into contact with the fluid at the joint! be protected.

(Effects) This invention configured as described above has the following effects.

In the pipe joint of claim 1, when the ribs are tightened together,
The biting sleeve is bitten into the second tube, the second collar and the second tube are integrated, and the first and second tubes are connected.

In particular, the collar is separate from the tube, so there is no need to weld the collar to the tube, and it is less bulky, making it easier to transport the tube before connection.

In the pipe joint of claim 2, since the peripheral surface of the center hole of the first brim forms a conical surface to fit the outer surface of the flare, it is possible to prevent deformation such as expansion of the flare due to tightening. .

In the pipe joint according to claim 3, since the bite sleeve is cut at a part of the circumference, when the collars are tightened together, the diameter contracts and the protrusion on the inner peripheral surface firmly bites into the second pipe. .

In the pipe joint according to the fourth aspect of the present invention, since the annular packing is sandwiched between the inner surface of the flare and the sleeve, the sealing of the pipe connection portion can be maintained.

In the pipe joint according to claim 5, the sleeve is fitted into the inner surface of the pipe connection part and is adhered to the linings formed on the inner surfaces of the first and second pipes, so that the sealing performance of the pipe connection part is improved. Moreover, it is possible to cut off contact between the base material of the pipe and the fluid at the pipe connection part, and prevent corrosion of the base material.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a pipe joint, FIG. 2 is an explanatory view of a bite sleeve, and FIG. 3 is a sectional view of another pipe joint. 1...First pipe 2...Second pipe 3
...Flare 4...First brim 5.
...Second brim 5a...Conical surface 7.
...Bolt 8...Soto 9...
... Biting sleeve 9a ... Projection lO.
...Putskin 11 ...Lining 1
2... Connection sleeve

Claims (1)

[Claims] 1. A first tube (1) having a flare (3) that widens at the tube end;
a second tube (2) that is butted against the tube of
) and a second collar (5) which is freely passed through the second tube.
and a tightening means (7, 8) for drawing the first collar and the second collar together; , and a biting sleeve (9) having a protrusion (9a) on the inner circumferential surface that fits into the second pipe. 2. A pipe joint according to claim 1, wherein the first collar has a circumferential surface of the central hole forming a conical surface (5a) so as to fit the outer surface of the flare. 3. The pipe joint according to claim 1 or 2, wherein the bite sleeve is cut at a part of the circumference. 4. A pipe fitting according to claim 1, 2 or 3, characterized in that an annular packing (10) is fitted to the second pipe so as to be sandwiched between the inner surface of the flare and the bite sleeve. 5. Connecting sleeves (12
) and is bonded to the linings (11) formed on the inner surfaces of the first and second tubes.
, 2 or 3 pipe fittings.