JPS6017595Y2 - Coupling device for conduits - Google Patents

Description

[Detailed description of the invention] This invention relates to a device that connects conduits to each other via flanges using members for tightening. This conduit consists of two coaxial corrugated metal tubes, and the inner tube has one or more It is reinforced by wrapping several metal strips in a spiral shape, and applying a pressure different from standard atmospheric pressure to the gap between the two tubes.

Consisting of two corrugated metal tubes arranged coaxially with each other, a green flat strip is spirally covered between the two tubes without contact, and the protrusions and/or recesses are plastically deformed on the strip. Pipes equipped with flat strips are known.

Tubes of this type can be produced continuously and in almost infinite lengths.

The corrugation of the metal tube makes it so flexible that it can be wound onto cable drums and laid like electrical cables.

The flat strip arranged between the two tubes acts as a mechanical joint between the two tubes by means of protrusions and/or recesses.

The recesses and/or protrusions prevent the inner tube from stretching when subjected to high pressure.

Since the flat green belts are covered in a spiral manner at a relatively large pitch without contacting each other, the diameter of the spiral decreases when the inner tube stretches slightly, and the spiral tightens tightly onto the inner tube. This effect also appears.

The present invention provides a coupling device for conduits, as known from Japanese Patent Application Laid-Open No. 48-77411, which is a flexible, easy-to-lay conduit for conveying media that is susceptible to external influences. Relates to conduits.

In this tube, the annular gap between the corrugated tubes is pressurized or depressurized, and leakage due to cracks or damage to the inner or outer tube is detected by monitoring changes in the pressurized or depressurized state.

The present invention provides a connecting device which makes it particularly easy to connect these tubes by means of a flange connection and to establish communication between the annular gap and the external connecting tube in the vicinity of the connecting device.

The annular gap is sealed by screwing the socket onto the outer tube, but these sockets have a welded braze to the inner tube in the area of the flange and a weld to the outer tube at the other end of the socket. is welded.

The object of the present invention is to provide a coupling device that makes it possible to connect such tubes to each other or to flange parts.

In this case, the connection must be simple and the inner tube must also be of such a nature that the gap between the two corrugated tubes is sealed as well.

This object was achieved in a coupling device of the type mentioned at the outset as follows.

That is, in this proposal, a socket equipped with a flange is provided, the end opposite to the flange is threaded and the tip is cut off, and the socket is screwed onto an outer corrugated tube, and a device for pressurizing or depressurizing the gap and controlling this pressure is provided. It is equipped with a hole communicating with a possible pressure control device.

A particularly tight connection is obtained if the end face of the inner corrugated tube is brazed to the flange face of the socket.

Furthermore, the gap between the inner tube and the two corrugated tubes is thereby separated from each other.

It has been found that brazing is particularly advantageous if the socket is provided with a through hole for machinability.

The reinforcing strip is mechanically fixed by the solder placed in the injection hole.

The invention will be explained in more detail with an example schematically shown in the figure.

A flange 1 is connected to the end of a conduit 2 consisting of a corrugated metal inner tube 3 and a metal corrugated outer tube 4 disposed coaxially with the inner tube 3, and provided with a reinforcing strip 5 spirally wrapped around the inner tube 3. Therefore, a socket 6 is provided in the present invention.

The socket 6 has a flange 7 at one end and one or more screws 8 at the other end.

A hole 9 is arranged in the area of the screw 8, by means of which a source of pressure or negative pressure or a control device can be connected to the gap 10 formed by the inner tube 3 and the outer tube 4.

The second hole 11 is used for injecting a brazing agent to mechanically and strongly connect the reinforcing strip 5 and the socket 6.

When creating a joint, it is preferable to process as follows.

First, remove the plastic jacket 12 from the end of the conduit 2,
The corrosion-resistant protective layer 13 is removed.

The outer tube 4 is then cut to a specified length and the loose flange fitting 14 is fitted to the end of the conduit 2.

After restoring the shape of the reinforcing strip 5 that was damaged or deformed when cutting the outer tube, the socket 6 is screwed in.

Care must be taken that the opening 11 lies above the reinforcing strip 5.

The socket 6 is screwed in until the end of the inner tube 3 protrudes.

The inner tube 3 should preferably protrude from the socket 6 by about 11 rrIn and may have to be cut further.

Next, the edge of the inner tube 3 is hammered into the inner edge 15 of the socket 6 so as to form a flat surface, and is brazed along the periphery of the socket 6.

Inject wax into the hole 11 of the socket 6, and insert the connection part 16 into the hole 9.
Install.

Finally, the socket 6 and the metal corrugated outer tube 4 are brazed together at 17 along the periphery.

To connect the end of the conduit to the flange 1, the loose flange 14 is turned to align the holes in the flange, and tightening bolts (not shown) are inserted and screwed together.

The same effect can be obtained by making the flange 7 of the socket 6 protrude in the radial direction, providing a hole therein, and screwing the flange 7 to the flange 1 with a tightening bolt.

A sealing gasket 18 prevents the material contained in the inner v3 from escaping.

It is appropriate to further cover the exposed outer tube 4 with a shrink tube 19 to prevent corrosion.

[Brief explanation of drawings]

The figure is a longitudinal sectional view of the coupling device according to the present invention. 3... Corrugated metal inner tube, 4... Corrugated metal outer tube, 6... Socket, 7... Flange, 8... Screw. , 9... hole, 11...
... Hole, 14 ... Loose flange joint.

Claims (1)

[Scope of utility model registration request] The inner tube of a coaxial tube consisting of two corrugated metal tubes is reinforced by covering the inner tube with one or several reinforcing metal strips in a spiral shape,
A socket 6 having a flange 7 at one end is used in a device in which a coaxial conduit, which is made by applying a pressure different from atmospheric pressure to the gap between a coaxial inner tube and an outer tube, is connected to each other via a flange using a member. Cut a screw 8 on the inner circumference of the other end and screw it onto the outer tube 4. One end of the socket 6 is brazed to the inner tube 3, the other end to the outer tube, and the coaxial inner tube 3 and outer tube are connected. A connecting device for a conduit, characterized in that a hole 9 is bored in the socket 6 for communicating a pressurizing device or a depressurizing device and a pressure control device of the device in the gap 10 between the socket 6 and the connecting device.