FR2709530A1 - Connection for high pressure pipes. - Google Patents

Abstract

This connection is made up of at least two parts (1) each arranged at the end of a pipe and comprising at least one annular groove (2) to withstand tearing forces. According to the invention, each part (1) has on the circumference of its internal wall grooves (3) stitched and parallel to the axis of the part (1). Application to the connection of high pressure pipes.

Description

The present invention relates to a new connection

for high pressure tubing.

  The connection of two high-pressure pipes can be made by welding or by a connection system consisting of

  two pieces. male and female, located at the end of the tubu-

  lures to be connected: they must be integrated with these tubu-

lures very firmly.

  The fitting is subject to significant tearing forces

  aunties: were ring gorges also

  inside each piece of the fitting. These pieces are

  on the corresponding tubing, which comes to conform externally to the inner shape of the annular grooves by

any known method.

  Thus fixed, the parts can not be torn off. In re-

  uniting the two parts by screwing, we thus realize the

  Agreement. If such a coupling is subjected to a torsion torque cor-

  In response to the tightening of the nut, it was noted that this connection tended to rotate: it is indeed crimped only in the

longitudinal direction.

  This problem is therefore not new: solutions, as below, have been found which do not fully

  satisfaction. For example, we realize some small reasons

  at the end of each piece with the tubing and glue is deposited at the time of assembly: the experiment has shown

  that this adhesion is quite random and expensive.

  It is therefore an object of the present invention to provide

  a high-pressure hose fitting that resists. not only to the pulling forces, but also to the efforts of

  torsion, for example when tightening these connections.

  Another object of the invention is to provide such a connection which is simple and inexpensive. and whose

  implementation is fast and very simple.

  These goals, as well as others that will appear later.

  are attained by a high-pressure pipe fitting which consists of at least two end-mounted parts

  tubings and each having at least one annular groove

  to resist the pulling forces. which connection is characterized according to the present invention. by the fact that

  each piece has, on the circumference of its inner face

  dull. fluted grooves parallel to the axis of this

  this. Advantageously, the splines are made between the (or) groove (s) annular (s) and the free end of the piece.

  They can extend between an annular groove

  gagement and an expressing commitment throat located near

this end.

  According to a preferred embodiment, the grooves have a width similar to that of the annular grooves, blanks substantially perpendicular to the inner wall of the coupling and

sharp edges.

  Advantageously, the depth of these grooves is slight.

  less than that of annular grooves.

  Preferably, each part of the coupling also comprises an outer annular reinforcement, located at these

  splines, to strengthen the mouth of the room.

  The following description, which does not contain any

  limitation, must be read in conjunction with the figures

  nexées, among which: - Figure 1 shows, in longitudinal section, a part of a coupling according to the present invention; - Figure 2 is a view along the line II-II of Figure 1; FIG. 3 is an enlarged view of detail III of FIG.

2:

  - Figure 4 corresponds to Figure 3 when a tubing is introduced into a part of this connection; and FIG. 5 shows, in longitudinal section, a connecting piece comprising, according to an alternative embodiment, a

engagement throat.

  A connector according to the present invention comprises two

  parts, one male, the other female, which are each

  in a known manner at the end of a tubing and which

  are joined in a manner also known.

  As already known, each piece 1, male or female. has annular grooves 2 to resist forces

  tearing off, as previously described.

  According to the present invention. between the free end of this piece 1, that is to say the one opposite to

  the end cooperating with the other piece to realize the

  Agreement. grooves 3 which are parallel to the longitudinal axis

  nal of piece 1 and stitched on the circumference of the face

internal 4 of it.

  As can be seen in FIGS. 1 and 3, these cannulas 3 have a width substantially equal to that of the grooves

  2. They have flanks 5 perpendicular to the

  king 4 internal of the connection and sharp edges 7, which have in particular

  purpose of allowing a better anchoring in the

  SPECT. The depth of these grooves 3 is substantially

  than the annular grooves to allow for

outlet without smudge.

  The flutes 3 are made between the last groove

  nular and the free end of the part, in particular between a so-called annular clearance groove and an engagement groove 9 located near this free end, as shown in Figure 5. This allows this part of the fitting to present a totally circular end. the deformations of the tube in the remaining flutes confined to

inside the room.

  To secure this piece 1 with the end of a tubular

  lure 8, just put this one on it. then, by known operations. to inflate this tubing 8 so that it comes, not only, to espouse the shape of the

  grooves 2. but also that of the grooves 3.

  As will be understood. this creates on the outside surface

  dull tubing 8 "male" teeth that also marry

  perfectly as possible the "female" teeth of the piece 1.

as shown in Figure 4.

  In addition. we can also equip each piece 1. at the level

  annular grooves 2 or grooves 3, a protrusion

  in the form of a circular outer ring: this excrescence

  ciency. in the case of high pressures, acts as an external hoop to rigidly hold the piece 1 on the tubing

S.

  Such a piece resists pulling forces as well as

  torsion torques. exercised in particular during the

  two pieces 1 of the same connection.

  The present invention relates to any type of tubing with

  stringing, but especially those called high pres-

  if we. that the fluid flowing in is liquid or gaseous.

  For example. a steel pipe fitting having a di-

  12.7mm outer meter features four 3 fluted 3 flutes which have a length of 3mm and a depth of 0.25mm. in-

  viron. The annular grooves 2 have a deep

  about 0.26mm. This makes it possible to obtain a couple of

  in rotation of 5Nm for such a steel tube. The annular grooves 2, the same connection. have a depth of about

0.26mm.

Claims (4)

  1-connection in particular for high-pressure pipes constituted by at least two parts (1) each disposed at the end of a pipe and comprising at least one annular groove (2) to withstand tearing forces, characterized in that each piece (1) has, on the circumference of its inner face (4), fluted (3) grooves, and parallel to the axis of said piece (1).   2- A coupling according to claim 1, characterized in that the bristles (3) are formed between the (or) annular grooves (2) and the free end of the workpiece (1). 3- connection according to claim 2, characterized in that the grooves (3) extend between a so-called annular clearance groove and an engagement groove (9) located at near this end.   4- connection according to any one of claims 1 to 3.   characterized in that each piece (1) further comprises   a protuberance in the form of an annular outer ring, killed at the level of the grooves (3).   - Connection according to claim 1, characterized in that the grooves (3) have a width similar to that of the   annular grooves (2). blanks (5) substantially perpendicular   to the inner wall (4) of said connector and sharp edges (7). 6Connect according to claim 1, characterized in that the depth of the flutes (3) is slightly less than   to those of annular grooves (2).