CN2176479Y

CN2176479Y - Muff-coupling flexible pipe expansion joint

Info

Publication number: CN2176479Y
Application number: CN 93223855
Authority: CN
Inventors: 安晓宁
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-08
Filing date: 1993-09-08
Publication date: 1994-09-07
Anticipated expiration: 2003-09-08

Abstract

The utility model relates to a flexible pipe expansion joint for connecting pipes, which is suitable for connecting large-sized and medium-sized pipes. The flexible pipe expansion joint is composed of a clamp 1, a self-tight type sealing ring 2, a check ring 3, an outer sleeve pipe 6, an inner pipe 7 and a fastening bolt 8. A limiting structure is composed of a baffle ring 5 which is arranged on the periphery of the abutting end of the inner pipe and the check ring 3 which is embedded in the inner diameter of the outer sleeve pipe. A sealing structure is composed of the self-tight type sealing ring 2, the clamp 1 and the screw bolt 8. By the improvement, the defect that a sealing ring can be easily damaged and can not be easily installed and disassembled in the prior art is effectively overcome. The flexible pipe expansion joint has the advantages of sealing reliability and installing and disassembling shortcut and convenience.

Description

Muff-coupling flexible pipe expansion joint

The utility model relates to a kind of pipe joint, is specially adapted to the connection of large and medium-sized pipeline.

The prior art of this technical field, a plug-in type flexible coupling is disclosed in the patent document (ZL92223946.0), the limit structure of this joint by be located in the outer tube through in interrupted limited ring be located in the equally distributed limiting stopper of pipe butt end periphery constitute.Technical characteristics according to this structure, for the interior pipe that has limiting stopper is inserted, then must on the sealing surface of outer tube, leave corresponding breach, constituting interrupted limited ring be the sealing of flange plate compression type because this joint adopts, so that be positioned at the sealing material unbalance stress of indentation, there, impaired easily, if special insert the back when not forwarding assigned position on request when interior pipe, under the axial tension effect, the limiting stopper of managing on the periphery in being located at will squeeze bad seal ring and cause leakage.In addition, by dress or dismounting the time, also must consider the relative position between the inner and outer pipes, breach on the outer tube diameter is alignd with equally distributed limiting stopper on the interior pipe periphery, just can make inner and outer pipes combination or separation, thereby on large and medium-sized pipeline, use, will run into inconvenience when especially carrying out field-strip.

The purpose of this utility model is the axial limiting structure and the sealing means of prior art are improved, to overcome above-mentioned shortcoming.

Task of the present utility model is achieved through the following technical solutions, in a slip joint that constitutes by clip, outer sleeve, seal ring, back-up ring, interior pipe and clamping bolt, its axial limiting structure is made of back-up ring in the embedding outer sleeve internal diameter and the baffle ring on the periphery of interior pipe butt end, its sealing configuration is by clip, and self-fastening ring and clamping bolt constitute.

The utility model is by above-mentioned improvement, not only solved outside the impaired easily shortcoming of seal ring unbalance stress, and in also allowing pipe is around any deflection of its axis.Its sealing means changes the more reliable clip self tightening of sealability into by traditional flange plate compression type, has not tightly saved a large amount of bolts and has improved installation rate, and used more safe and reliable on all kinds of pressure pipings.In addition, during the utility model installation or removal, only need back-up ring to be embedded the outer sleeve internal diameter or take out, just can make inner and outer pipes combination or separation, and needn't consider the relative position between the inner and outer pipes.So the utility model is when installation, dismounting, and is simpler and more direct than prior art, convenient.Thereby effectively solved not easy-operating problem when on large and medium-sized pipeline, using.

Accompanying drawing 1 FERRULETYPE flexible pipe slip joint ssembly drawing wherein

Pipe 8-bolt in the 1-clip 2-seal ring 3-back-up ring 4-positioning ring 5-baffle ring 6-outer sleeve 7-

Accompanying drawing 2 outer sleeve axial view wherein

The 9-locating slot

Accompanying drawing 3 back-up ring front views

Below in conjunction with example in detail:

Referring to accompanying drawing 1, be provided with described locating slot 9(in the internal diameter of outer sleeve 6 and see accompanying drawing 2), see accompanying drawing 3 to embed described back-up ring 3() in pipe 7 butt end periphery be provided with described baffle ring 5, when interior pipe is subjected to axial tension to two end movements, will be subjected to the prevention of back-up ring 3 and realizes axial limiting.The internal diameter of two sealing surfaces of seal ring 2 is slightly less than the external diameter of inner and outer pipes, make it when no working pressure, keep certain pressure to tube wall, clip 1 is by being located at the above positioning ring 4 location of outer sleeve, make to produce to axial between itself and the outer sleeve and slide, by tighting a bolt 8, make clip produce certain pretightening force to seal ring, to guarantee in pipeline pressure sealability hour, press big more in the pipeline, seal ring is big more to the impacting force of sealing surface, therefore sealability is good more, thereby has realized the self-energized seal to pipeline.Be loose fit between clip and the interior pipe, so interior pipe not only can also have an amount of lateral deflection simultaneously around any deflection of its axis, can make connected pipe present certain flexibility, thereby the stress that can improve greatly between pipeline concentrated and the fatigue stress phenomenon.

Accompanying drawing 2 has shown the locating slot 9 in the outer sleeve internal diameter, on the end face of this groove symmetry be provided with some notches, this example describes with four notches, the notch size is slightly larger than the size of back-up ring convex platform, so that the embedding of back-up ring.

Accompanying drawing 3 has shown the structure of back-up ring 3, and this back-up ring is made of two parts symmetrical, and the boss on the back-up ring is corresponding with the notch on the locating slot 9, external diameter of pipe in the back-up ring internal diameter is slightly larger than and less than the external diameter of baffle ring 5.

During installation, can be earlier with interior pipe and institute's connecting tube butt welding, put seal ring then and interior pipe be inserted into appropriate location in the outer sleeve, in again back-up ring being snapped on the pipe, with the boss of back-up ring from the notch of locating slot embed can realize spacing, opposite side with seal ring is enclosed within on the sealing surface of outer sleeve at last, load onto clip, bolt on, then finished assembly process of the present utility model, also the utility model can be pressed in advance said sequence assembling, and then with institute's connecting leg road butt welding.

By above explanation, also can further find out, nose balance ability of the present utility model only depends on the distance between outer sleeve two locating slots, and distance is big more, allows pipe axial stretching scope just big more, simultaneously owing to have the axial limiting function, the utility model can bear certain axial tension, and therefore, the utility model is except being used as the pipeline axial telescopic compensator, also can use, have dual performance as big gap flexible pipe joint.

Claims

1, a kind of pipeline expansion joint by clip (1), seal ring (2), back-up ring (3), outer sleeve (6), interior pipe (7) and clamping bolt (8), formation, the axial limiting structure of pipe in being respectively equipped with on outer sleeve and interior pipe is characterized in that: described limit structure is by the baffle ring (5) on the periphery of interior pipe butt end and embed the formation of the back-up ring (3) in the locating slot on the outer sleeve internal diameter.

2, according to the pipeline expansion joint of claim 1, it is characterized in that: the internal diameter of described outer sleeve (6) is provided with locating slot (9), is provided with several symmetrical notches on this locating slot.

3, according to the pipeline expansion joint of claim 1, it is characterized in that: described back-up ring (3) is provided with several symmetrical boss.

4, according to the pipeline expansion joint of claim 1, it is characterized in that: the periphery of described outer sleeve (6) is provided with the positioning ring (4) of restriction clip (1) axial displacement.