FR2520841A1 - Reusable compression joint for tubes - has conical wedge olive to provide air tight seal under pressure or suction - Google Patents

Abstract

The reusable compression joint for coupling flexible tubes with parallel grooves (8) to other elements of a circuit provides an airtight seal for fluids under pressure, or suction. A tapered sleeve (5) slides over the braided tube (9) of which the top is stripped to reveal the grooves. Two split collets (7) are mated with the grooves, and then the parallel, internally threaded part of the sleeve (5) is screwed onto a union nut (1), whose conical end is crushed down on the grooves, while they are pressed upwards by the tapered sleeve and split collets, which also clamp the end of the braiding.

Description

 The object of the invention relates to a recoverable connection device for piping with parallel turns.

 It is intended to be placed between a corrugated metal pipe with parallel turns and an industrial installation element, in order to produce a perfectly sealed assembly for the passage of fluids under pressure or even under vacuum.

 In known connection devices of this kind, a synthetic or composite textile seal was used to obtain the seal; this element complementary to the construction posed certain problems of temperature resistance and resistance to certain chemical agents, other welded elements lost their physico-chemical resistance characteristics during assembly. the burst pressure limit was lowered and the chemical compatibilities decreased following the junction of the fitting with the hose.

 The device according to the invention eliminates these drawbacks and makes it possible to produce an assembly of better mechanical, chemical and thermal resistance, while avoiding the use of a seal; it also gives the possibility of ensuring a perfect seal up to burst pressure limits directly linked to the strength of the metallic braids.

 It consists of the combination of a fitting and a skirt with two half-shells.

 In the accompanying drawing, given by way of nonlimiting example, of one of the embodiments of the subject of the invention: The device is shown seen in elevation with cut parts.

 The connection 1 in its part 2 adapts to the element of the circuit to be supplied and in its lower part 3 ensures the flexible sealing connection.

 First, it has a conical part to seal the hose and serving as a seat for deformed turns, then a threaded part allowing the crushing of premature turns, and finally an outgoing part allowing the guidance and the maintenance of crushed turns. . This optional part can be omitted to obtain a full passage avoiding any pressure drop.

 The skirt 4 adapts to the connector to allow the coils to be crushed by means of a fine pitch thread 5, and at its lower part 6 to tighten the two half-shells 7 to obtain the desired deformation ensuring the both the tightness and the jamming of the braid 9 of the hose 8.

 The half-shells 7 have several functions. They adapt by their internal shape 6 to the external shape of the hose 8. Their external conical section transmits the clamping force ensuring the tightness and jamming of the outer braid 9 of the flexible.

 The design of this fitting allows for a tip exchange in the shortest possible time. It thus avoids prolonged shutdown of production equipment.

 This operation can be carried out with a minimum of tools, avoiding the intervention of specialized personnel. Finally, this connection method makes it possible to fully retain the characteristics of the hose.

 However, the shapes, dimensions and arrangements of the various members may vary within the limit of the equivalents, like the materials used for their manufacture, without changing the general conception of the invention which has just been described.

Claims (2)

 10 Recoverable connection device for piping with parallel turns, allowing the removal of any joint to obtain a perfectly sealed assembly between the two connected elements for the passage of fluids under pressure or under vacuum, with improvement in mechanical, chemical and thermal resistance, characterized by the combination of a functional connection (1) of a skirt (5) and two half-shells (7).  20 Device according to claim 1, characterized in that the connector (1) is adapted by its part (2) to the element of the circuit to be supplied while ensuring sealing and by its part (3). sealing of the hose by its conical section, the crushing of the pre-matted turns by its threaded part and the guide, as well as the maintenance of the turns crushed by its outgoing part.  30 Device according to claim 1, characterized in that the skirt has a thread (5) and a conical section (4).  4 Device according to claim 1 characterized in that the two half-shells (7) have an internal shape (6) profiled and a conical outer face.