Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L37/00—Couplings of the quick-acting type
  • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
  • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
  • F16L37/091—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a ring provided with teeth or fingers
  • F16L37/0915—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a ring provided with teeth or fingers with a separate member for releasing the coupling

Definitions

• Connection device for connecting a pipe end to a member
• the present invention relates to a connection device for the sealed connection of a pipe end to a member of a circuit for conducting fluids under pressure, such as another pipe, a reservoir, a pump, etc.
• Connection devices which comprise a tubular end piece having one end coupled to or integral with the member and a free opposite end by which the pipe end is introduced.
• the tubular end piece is associated with means for tightly securing the pipe end to it, which successively comprise, in a direction of introduction of the pipe end into the tubular end piece, end retaining means pipe and sealing means.
• these retaining means comprise a washer with deformable claws. Sealing is commonly ensured by an O-ring made of a deformable elastomeric material freely received in an annular recess of the tubular end-piece delimited radially by a cylindrical surface of the latter.
• the pipe end When introducing the pipe end into the tubular end piece, the pipe end is force fitted into the claw washer, the claws of which are then brought into a retaining position in which they are inclined and have a free end in abutment against an external surface of the pipe, and in the seal which is then crushed between the external surface of the pipe and the cylindrical surface of the annular recess.
• connection devices such as that disclosed in document GB-A-2 143 918, the seal is trapped between a part of the end piece and a sleeve of which the claws are integral and which is fixed on said part of the mouthpiece.
• the aforementioned problem does not arise in such a connection device.
• the joint being fixed to the end piece just behind the claws, it hinders the expansion of the claws which, during the introduction of the pipe, tend to scratch the pipe and make the introduction of the latter difficult.
• these connection devices have a relatively complex structure.
• a connection device for the connection of a pipe end to a member, equipped with means for securing the pipe end to it in leaktight manner, these means successively comprising, in a tubular end piece coupled to the member and in a direction of introduction of the pipe end into the tubular end piece, deformable claws intended to be brought by the pipe end into a retaining position in which the claws are inclined and have a free end bearing against an external surface of the pipe and an annular seal mounted axially free in an annular recess delimited radially by a cylindrical surface of the tubular end piece, the seal comprising a first substantially toric inner surface to cooperate with the external surface of the pipe and a second substantially cylindrical outer surface to cooperate with the cylindrical surface of the tubular end piece, the second surface being at least partially offset axially with respect to the first surface of the side of the claws.
• the second surface provides the seal with an offset support on the cylindrical surface of the annular recess which limits the movement and the rolling on itself of the seal towards the claws.
• the seal is axially free in the annular recess so that, during the introduction of the pipe into the claw washer, the seal is free to move back and does not hinder the expansion of the claw washer.
• the seal comprises a third substantially frustoconical inner surface, extending on the side of the second surface to cooperate in the manner of a wedge with the claws in the retaining position.
• the part of the seal delimited by the second and third surfaces thus forms a wedge providing on the one hand to the seal a support on the cylindrical surface of the annular recess preventing the seal from moving and rolling on itself and constituting on the other hand a cam coming to apply the claws against the external surface of the pipe according to a force proportional to the pressure of the fluid circulating in the circuit, which reinforces the retention of the end of driving.
• - Figure 1 is a longitudinal sectional view of a connection device according to the invention
• - Figure 2 is a partial longitudinal sectional view of the connection device when a pipe end is connected to it.
• connection device is intended for connecting a pipe end C to a member of a circuit for conducting fluid under pressure.
• This member can be a fluid emitting or receiving member such as another pipe end, a pump, a reservoir or the like.
• connection device comprises a tubular end piece 1 having a threaded end 1.1 intended to be implanted in the member and an opposite opposite end 1.2 by which the pipe end C is intended to be introduced into the tubular end piece 1.
• the tubular end piece 1 comprises a succession of three internal annular recesses 2, 3 and 4 of decreasing diameter in the direction of introduction of the pipe end indicated by the arrow 5.
• the annular recess 4 has a diameter slightly greater than the diameter of the pipe end C to receive the latter in abutment against a shoulder 6 of the annular recess 4.
• the annular recess 3 is delimited radially by a cylindrical surface 7 and is connected to the annular recess 4 by a shoulder 16.
• the annular recess 3 receives a seal 8 of annular shape and in elastomeric material which is freely mounted in the annular recess 3 so as to be movable in an axial direction of this recess and of the end piece 1.
• the seal 8 comprises a first inner surface 9 of toroidal shape.
• the surface 9 defines a passage section slightly smaller than that of the pipe end C.
• the seal 8 comprises a second substantially cylindrical outer surface 10 having a diameter substantially equal to that of the annular recess 3 to cooperate with the cylindrical surface 7 of the annular recess 3.
• the second contact surface 10 is partially offset axially with respect to to the first contact surface 9.
• a third interior surface 11 of frustoconical shape extends substantially at the level of the second surface 10. The second surface 10 and the third surface 11 converge towards one another on an opposite side to the first surface 9 to delimit a part having a wedge-shaped section along a radial plane of the seal.
• the second and third surfaces 10 and 11 extend on the side of the annular recess 2.
• the annular recess 2 is connected to the annular recess 3 by a shoulder 12 against which a claw washer 13 is applied.
• the claw washer 13 is kept pressed against this shoulder by means of a locking ring 14 set in the end 1.2 of the tubular end piece 1.
• a pusher 15 is slidably received in the locking ring 14.
• the seal 8 is pushed towards the claw washer under the effect of the pressure of the fluid circulating in the circuit and acts as a corner applying the claws against the external surface of the pipe and thus strengthening the restraint exerted by them.
• the withdrawal of the pipe end C is carried out in a conventional manner by depressing the pusher 15 to spread the claws and thus free the pipe end.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9542413

Family Applications (1)

Country Status (4)

Families Citing this family (7)

Family Cites Families (4)

• 1999
  • 1999-02-23 FR FR9902229A patent/FR2790056B1/fr not_active Expired - Lifetime
• 2000
  • 2000-02-18 AU AU28106/00A patent/AU2810600A/en not_active Abandoned
  • 2000-02-18 WO PCT/FR2000/000411 patent/WO2000050800A1/fr not_active Application Discontinuation
  • 2000-02-18 EP EP00906427A patent/EP1155255A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events