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
  • F16L11/00—Hoses, i.e. flexible pipes
  • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
  • F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall

Definitions

• Automotive fluid transport hose comprising a smooth inner tube and a corrugated outer tube
• the present invention relates to a pipe for transporting automotive fluids such as coolant, fuel, windshield washer fluid, etc.
• a pipe for transporting automotive fluids comprising a smooth inner tube based on an elastomeric thermoplastic material, an outer corrugated tube which is in contact with the inner tube through the inner top of its waves and which is made of a thermoplastic material based on polyamide, and means for connecting the outer tube to the inner tube.
• the pipe thus obtained is particularly well suited to the transport of automotive fluids and has a good ability to be shaped, in particular by elastic deformation.
• This pipe is also simple and inexpensive to produce.
• the elastomeric thermoplastic material used for the inner tube also allows easy creation of resistant connections with 'the organs to which the hose is connected, for example by means of nipples integral with the bodies and force-fitted in the inner tube.
• the tubes are monolayers
• the polyamide used is a poly- amide 12
• the thermoplastic elastomer is a mixture of a polypropylene and an elastomer based on an ethylene propylene diene monomer.
• This embodiment has very good characteristics for the transport of automotive fluids.
• the pipe of the invention comprises an inner tube, generally designated at 1, and an outer tube, generally designated at 2, surrounding the inner tube 1.
• the inner tube 1 is a smooth tube here having a single-layer structure of an elastomeric thermoplastic material.
• the elastomeric thermoplastic material used is a mixture of a polypropylene and a rubber based on an ethylene propylene diene monomer (EPDM) such as one of those produced under the reference SANTOPRENE by the company ADVANCED ELASTOMER SYSTEMS.
• EPDM ethylene propylene diene monomer
• the outer tube 2 is a corrugated tube forming waves having an inner vertex 3 of inner diameter equal to or very substantially close to the outer diameter of the inner tube 1.
• the tubes 1 and 2 are connected either at each vertex 3 by gluing or by adhesion for example during a coextrusion process either, if the pipe is of determined length, at the location of its ends by simple mechanical stop of the tube ex- térieur 2 against a flange of the inner tube 1 with or without bonding the ends of the tubes 1 and 2 to each other.
• materials are chosen which are capable of adhering or of being bonded to each other.
• the outer tube 2 here has a monolayer structure of polyamide and preferably of polyamide 12.
• the materials used can be recycled materials originating, for example, from the grinding of scrap tubes, which causes less pollution and generates economic gain.
• the pipe is obtained here by means of a known machine which comprises an extrusion head making it possible to produce, through a first channel, a parison which is pressed under the effect of an external suction against articulated molds surrounding the head of extrusion and moving parallel to the axis thereof.
• a second extrusion channel allows, downstream of the parison extrusion, to fill the corrugated tube formed by the parison inside the molds with an internal smooth tube, which makes it possible to produce the pipe of the invention .
• This neutral gas, air, nitrogen or any other suitable gas may be kept under pressure inside the waves of the corrugated tube, this pressure being able to constitute an insulating element fighting against the migration of the vapors of 1 inside or outside through the pipe wall.
• connection of the two tubes will be sealed and preferably at each interior vertex of the corrugated tube.
• the inner tube may include an internal conductive layer to allow the evacuation of the electrostatic charges generated by the friction of the fluid transported along the pipe. This limits the risk of explosion when the transported fluid is flammable.
• the material of the tube 1 will be chosen as a function of its chemical resistance and its permeability to the fluid conveyed, while the material of the tube " 2 will be chosen mainly for its characteristics of resistance to the external atmosphere, chemical resistance and mechanical and corrosion resistance.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=27619769

Family Applications (1)

Country Status (5)

Families Citing this family (8)

Family Cites Families (11)

• 2002
  • 2002-01-31 FR FR0201135A patent/FR2835307B1/fr not_active Expired - Fee Related
• 2003
  • 2003-01-22 WO PCT/FR2003/000208 patent/WO2003064911A1/fr not_active Application Discontinuation
  • 2003-01-22 EP EP20030712276 patent/EP1470355A1/fr not_active Ceased
  • 2003-01-22 MX MXPA04007368A patent/MXPA04007368A/es unknown
  • 2003-01-22 US US10/503,299 patent/US20050103392A1/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events