Device of miniaturised construction for producing high...

F - Mech Eng,Light,Heat,Weapons – 04 – B

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F04B 33/00 (2006.01) A61M 11/00 (2006.01) B05B 11/00 (2006.01) B05B 11/02 (2006.01) F04B 37/12 (2006.01) F04B 53/12 (2006.01) A61M 15/00 (2006.01)

Patent

CA 2232151

A miniaturised device for producing high pressure in a fluid imposes stringent requirements on the manufacturing process. The device according to the invention consists of a hollow piston (57) displaceably mounted in a cylinder and a valve member (58) which is guided by the hollow piston (57) and mounted so as to be axially movable relative to the hollow piston (57). The valve member (58) is arranged at one end of the hollow piston (57) inside or immediately in front of the end of the hollow piston (57). The device is used in a mechanically operated high pressure atomiser. This consists of a two- part housing which comprises a pump housing (52) with nozzle (54), a blocking mechanism (62), a spring housing (67) with spring (68), a non-pressurised storage container (71) for the fluid (72) and a mechanical counter integrated in the spring housing (67). The valve (58) operates without any auxiliary force, closes very rapidly and is sealed tight against high pressure. The atomiser is safe and simple to operate and environmentally friendly. The fluid is metered extremely accurately. The atomiser is used, for example, to produce an inhalable aerosol of a liquid medicament without the use of a propellant gas, at 320 bar, for example.

Ce dispositif miniaturisé, destiné à produire une pression élevée dans un fluide, requiert des conditions rigoureuses de fabrication. Le dispositif selon l'invention comprend un piston creux (57) monté mobile dans un cylindre, ainsi qu'une soupape (58) guidée par le piston creux (57) et montée de façon à être mobile axialement par rapport au piston creux (57). Cette soupape (58) est placée au niveau d'une extrémité du piston creux (57), dans celle-ci ou au voisinage antérieur immédiat de celle-ci. On utilise ce dispositif dans un atomiseur haute pression à commande mécanique, lequel comprend un boîtier en deux parties comportant un boîtier de pompe (52) pourvu d'un embout (54), un mécanisme de blocage (62), un boîtier de ressort (67) pourvu d'un ressort (68), un contenant (71) de stockage de fluide (72), non mis sous pression, ainsi qu'un compteur mécanique monté dans le boîtier (67) du ressort. La soupape (58) fonctionne sans apport de force auxiliaire, se ferme très rapidement et oppose une étanchéité à toute pression élevée. Cet atomiseur est sûr, de maniement simple et respecte l'environnement. Le fluide est dosé de manière extrêmement précise. On utilise cet atomiseur, par exemple, pour produire un aérosol d'inhalation d'un médicament liquide, sans l'aide d'un gaz propulseur, à une pression de 320 bars, par exemple.

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