FR2628178A1 - TIP FOR HIGH PRESSURE FLEXIBLE PIPING - Google Patents

Abstract

The invention relates to fittings for flexible pipes. It relates to a nozzle in which a coupling 16 has an external connecting branch 20 and an internal branch 18 which penetrates into the end 14 of a flexible pipe which is itself surrounded by a crimping sleeve 24. A bearing surface intermediate 22 of the coupling delimits a cavity 30 between it and the end of the flexible pipe 14. According to the invention, a capillary hole 32 places this cavity in communication with the outside of the nozzle. Application to the production of flexible high pressure pipes for hydraulic fluids.

Description

(6) FRENCH REPUBLIC Publication No. 2,628,178 (to be used only

  for INSTITUTE NATIONAL Reproduction Orders)

OF INDUSTRIAL PROPERTY

  National Registration Number: 89 02834 PARIS

(Int CI ': F 16 L 33/22.

Q APPLICATION FOR PATENT OF INVENTION A1

  Filing date: March 3, 1989.) Applicant (s) Company known as: INGERSOLL-RAND COM-

PANY - US.

  () Priority: US, 3 March 1988, No. 163,489.

) Inventor (s): José P. Munoz.

    Date of the public availability of the

  application: BOPI "Patents" No. 36 of 8 September 1989.

  References to other national documents appearing

paid: rt Owner (s):

  ) Agent (s) Cabinet Beau de Loménie.

  Tip for high pressure flexible piping.

  The invention relates to end pieces for

  pes. It relates to a nozzle in which a coupling 16 has an external connection branch 20 and an internal branch 24 which enters the end 14 of a pipe 2

  flexible which is itself surrounded by a crimp sleeve

  24. An intermediate bearing surface 22 of the coupling delimits a cavity 30 between it and the end of the flexible tubing 14. According to the invention, an capillary hole 32 puts this cavity in communication with the outside of the tip. 'Application to the realization of flexible pipes with high

  I pressure for hydraulic fluids.

  The present invention relates to couplings and couplings of high-pressure flexible pipes and the like, and in particular to a piping end-piece.

flexible at high pressure.

  The end pieces of the type of the invention usually comprise a sleeve crimped on the end of a flexible pipe, the end housing a ribbed branch.

  a flexible pipe coupling.

  Usually, when a fluid flows into the

  end, nothing untoward happens. However, if the flow

  of fluid decreases or is interrupted at a certain location

  In the upstream cone, the static pressure in the coupling causes the fluid to search for a leakage path. If the fluid can creep between the sleeve and the end of the flexible tubing, as is often the case, the sleeve can break or its crimping, retaining it on the flexible tubing, can be loosened so that the

sleeve is free.

  The invention relates to a nozzle for piping

  flexible 'high pressure which allows the resolution of the pro-

  aforementioned problem, posed by the tips of the prior art

  pool. More specifically, the invention relates to a flexible high pressure pipe end having a flexible pipe end, a flexible pipe coupling.

  and a crimp sleeve, the coupling having a first

  a first flexible pipe support leg, a second external connecting leg and an annular span between the legs, the first leg being retained in the end of the flexible tubing while the first leg and the end of the flexible tubing;

  are retained in the crimp sleeve which is itself

  even crimped on the end of the flexible pipe; the

  reach and the end of the flexible tubing have

  distant faces delimiting between them a cavity; the tip includes a device for communicating

  this cavity with an outer surface of the sleeve.

  Other features and advantages of the invention

  will be better understood by reading the description

  which will follow of an embodiment, made with reference

  in the appended drawing, the single figure of which is a longitudinal section

  tudinal of a tip for end of flexible pipe to

  high pressure according to one embodiment of the invention.

  As the single figure shows, the tip 10 com-

  carries a portion of flexible tubing 12 having one end

  mite 14, and a coupling 16 for flexible tubing.

  The coupling 16 has a first flexible pipe support leg 18 which has a ribbed shape, at a first end, a second external connection branch 20, at the opposite end, and an element 22 forming a span between the branches 18 and 20. A sleeve 24 surrounds both the end 14 of the flexible tubing and the limb

  18, and it is crimped on the end 14.

  The end 22 forming a bearing has a flat or flat portion 26 and a circumferential wall 28 formed at the periphery of the portion 26. The wall 28 is nested in the sleeve 24. There remains a cavity 30 between the flat portion 26 and the end 14 of the flexible pipe 12. If a fluid that can leak or drip under pressure reaches the

  cavity 30 and creeps between the end 14 of the pipe

  flexible earth and the wall 28 and between the end 14 and the sleeve 24, it can cause fracturing of the sleeve, or loosening of it relative to the piping

  flexible to the point that it can be released.

  According to the invention, a capillary hole 32 is formed through both the wall 28 and the sleeve 24 so that a static pressure that might appear as a result of fluid accumulation is suppressed. Hole 32 is a regulated path of leaks that prevents integrity

  tip is not likely to be damaged.

  Of course, various modifications may be made by those skilled in the art to the tip that has just been described by way of non-limiting example without

depart from the scope of the invention.

Claims (4)

  1. Tip for high pressure flexible piping, of the type comprising one end (14) of flexible tubing   (12), a coupling (16) and a sleeve (24) for   wise, the coupling having a first branch (18) flexible pipe support, a second branch (20) external connection, and an annular bearing (22) placed between the branches, the first leg (18) being housed in the end of the flexible pipe, the first leg and the end of the flexible pipe being housed in the crimping sleeve (24), the sleeve being crimped on the end of the flexible pipe, and the bearing and the end of the flexible tubing having remote surfaces which delimit a cavity (30) therebetween,   characterized in that the sleeve (24) comprises a device   tif (32) for communicating the cavity (30) with   an outer surface of the sleeve (24).   2. End piece according to claim 1, characterized in that the communication device comprises a capillary hole (32) formed in the sleeve and opening into the cavity (30).   3. End piece according to claim 2, characterized in that the bearing surface (22) has a substantially planar portion (26) having a shallow circumferential wall (28) protruding from its periphery, the crimping sleeve has a cylindrical wall in which the circumferential wall of the span is housed, and the capillary hole (32) is formed in both walls. gold 1.4 (28 Bone 12 - -.-. _-... 22-.---- 16. r% C0