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
  • F16L11/06—Hoses, i.e. flexible pipes made of rubber or flexible plastics with homogeneous wall
• • 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
  • F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
  • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
  • Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
  • Y10T428/1393—Multilayer [continuous layer]

Definitions

• the present invention relates to a multilayer pipe usable in particular in the fuel supply circuits of thermal engines of a motor vehicle, for example for pumping fuel into a tank.
• the fuel is generally pumped into the tank by means of a pump (or suction plate) connected on the one hand to the fuel supply circuit of the engine of the motor vehicle and on the other hand , via a pipe, to a filter carried by an element that tracks the level of fuel in the tank.
• a pump or suction plate
• This pipe is generally made of rubber.
• one of the constraints linked to the design of the tanks, and in particular of the metal tanks and in particular those made of steel, relates to the evacuation of the electrostatic charges accumulated during the friction of the fuel, in order to avoid the risk that an electric discharge trostatic produces an electric arc likely to ignite the fuel or fuel vapors in the tank.
• the discharge of electrostatic charges is generally ensured by grounding the parts making up the reservoir. It is therefore necessary that the plastic parts, and in particular the pipe connected to the pump and to the filter, be conductive.
• a multilayer pipe comprising an outer layer, an intermediate layer and an inner layer, made of thermoplastic material, the inner and outer layers comprising additives making these layers conductive.
• the additives used can be metal particles, metal ions, fibers or carbon powder, and are preferably selected with a view to obtaining a surface resistivity of the internal and external layers of less than about 10 ⁇ ohms. .
• the pipe thus produced has the advantage of being conductive while being inexpensive, and of having good mechanical properties conferred in particular by the intermediate layer.
• the layers are made from the same material.
• the layers being produced from the same material, the adhesion of these to each other is good, which reinforces the mechanical strength of the pipe.
• the internal layer is made of a thermoplastic material made conductive such as polyamide 12 such as for example those referenced X7395 or LX9102 produced by the company CREANOVA or polyamide 6 such as for example that referenced GRILON from the company EMS CHEMIE or those produced by RHODIA.
• a thermoplastic material made conductive such as polyamide 12 such as for example those referenced X7395 or LX9102 produced by the company CREANOVA or polyamide 6 such as for example that referenced GRILON from the company EMS CHEMIE or those produced by RHODIA.
• the intermediate layer is made of a thermoplastic material identical to that of the internal layer but not conductive.
• the plastic material used is for example polyamide 12 referenced LX 9002 from the company CREANOVA or polyamide 6 referenced GRILON R47 from the company EMS CHEMIE.
• the outer layer is made of a conductive thermoplastic material identical to that of the inner layer.
• thermoplastic materials can be used to make the pipe, the choice of these materials being for example dictated by the compatibility, in particular chemical, of these with the transported fluid, their mechanical properties, their ability to withstand heat. depending on the intended application.
• polyolefins and in particular polyethylene
• the inner layer and the outer layer are made of polyethylene made conductive by carbon black, like that of grade 902 produced by the company CABOT, and the intermediate layer is made of common high density polyethylene such as those produced by the companies.
• ATOFINA, ELENAC OR SOLVAY are examples of polyethylene made conductive by carbon black, like that of grade 902 produced by the company CABOT.
• polyesters and in particular polybutylene terephthalate
• the inner layer and the outer layer are made of conductive polybutylene terephthalate like that referenced GRILPET ESD from the company EMS CHEMIE and the intermediate layer is made of common polybutylene terephthalate such as that referenced GRILPET B24 from the same company.
• the pipe can also be produced based on a polyether-ester copolymer such as that referenced HYTREL from the company DUPONT DE NEMOURS.
• the internal and external layers are made of a conductive polyamide 6 like the one referenced GRILON R47 from the company RHODIA and the intermediate layer is made of a polyethylene such as those produced by the companies ATOFINA, ELENAC or SOLVAY.
• the internal and external layers are made of polyamide 12 such as those produced by the company CREANOVA under the references X7395 or LX9102 and the intermediate layer is made of polyethylene.
• the internal and external layers have a thickness of between 0.1 mm and 0.4 mm approximately, and the intermediate layer has a thickness of between 0.6 mm and 1 mm approximately.
• the inner and outer layers have a thickness of about 0.1 mm and the intermediate layer has a thickness of about 0.8 mm.
• the pipe according to the invention can also be corrugated or smooth.
• the invention is not limited to the embodiment described and it is possible to add variants without departing from the scope of the invention as defined by the claims.
• this pipe can be used in particular in all applications for the transport of flammable, liquid or gaseous products, the flow of which generates electrostatic charges or more generally for any application requiring discharge of electrostatic charges.

Landscapes

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

Applications Claiming Priority (3)

Publications (1)

Family

ID=8862346

Family Applications (1)

Country Status (7)

Families Citing this family (5)

Family Cites Families (9)

• 2001
  • 2001-04-13 FR FR0105122A patent/FR2823551B1/fr not_active Expired - Fee Related
• 2002
  • 2002-04-09 CZ CZ20032252A patent/CZ20032252A3/cs unknown
  • 2002-04-09 EP EP02724408A patent/EP1377771A1/de not_active Withdrawn
  • 2002-04-09 BR BR0204823-0A patent/BR0204823A/pt not_active IP Right Cessation
  • 2002-04-09 WO PCT/FR2002/001227 patent/WO2003042589A1/fr not_active Application Discontinuation
  • 2002-04-09 US US10/470,095 patent/US20040112453A1/en not_active Abandoned
  • 2002-04-09 MX MXPA03009253A patent/MXPA03009253A/es unknown

Non-Patent Citations (1)

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