Receptacles – For cryogenic content
Patent
1997-09-17
1998-11-24
Moy, Joseph M.
Receptacles
For cryogenic content
220581, 220589, 220592, B65D 116
Patent
active
058396004
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention refers to a plastic container, shaped as a generally cylindrical pressure vessel or bottle, provided with a metallic nozzle and made for storing and transporting pressurized fluids, more particularly gases for home or industrial use.
BACKGROUND OF THE INVENTION
Full metal containers, built in steel or aluminum, as well as those comprising a metallic inner sealant and externally coated with reinforced plastic are known in the art.
These containers of the prior art present a metallic body incorporating a generally threaded nozzle, also in metallic material, the assembly being designed to support the high internal storage pressures of the fluid stored therein.
One of the shortcomings of these prior art metallic containers refers to the weight of their structures, requiring dimensions for storage and transportation systems which lead to a reduced net weight/gross weight ratio.
Further shortcomings of the metallic containers result from their fragmentation in cases of rupture and from a somewhat limited resistance to impact and to cryogenic situations due to the features of the metallic material.
Even in those metallic containers externally coated with reinforced plastic materials, where impact resistance is improved, the disadvantages related to excessive weight, fragmentation of the metallic sealant and their vulnerability to cryogenic shocks still persist.
On the other hand, more precisely in the field of plastic containers for fluids under low pressure, such as occurs with certain carbonated liquids, fuels and other products, constructions are known where the container nozzle may be incorporated one-piecewise to the plastic material of the body, such as in preforms of blown bottles, or may assume the shape of a metallic insert fixed to the body of the container, so as to adequately seal it or to ensure the fluid-tightness of its connection to a tubing coupled thereto.
Considering certain applications, the container requires a nozzle provided with a thread and must be structurally resistant to support torsion efforts and/or wear produced by constant operations of connection to supply or discharge tubings.
Various constructions of blown plastic vessels incorporating metallic inserts to define their input or output nozzles, to be coupled to closure caps or to various tubings of the systems to which these containers must be coupled are known.
Although presenting excellent results in low pressure fluid applications, generally under 5 bar, the known constructions for inserting metallic nozzles into these plastic containers are not capable of assuring adequate fluid-tightness when pressures in the container reach higher values, for example, over about 5 bar.
In these prior art constructions, adequate axial and rotational locking is reached, although the relative fluid-tightness is ensured only through molding of the plastic material of the container body around a portion of the surface of the insert designed to form a kind of labyrinth. These labyrinthlike mountings have proven insufficient to ensure fluid-tightness under high pressures, even when such labyrinths include elastomeric sealing rings. In these constructions, the sealing rings are barely compressed to ensure fluid-tightness under high pressures, due to the fact that the plastic material of the body is only molded around the ring.
SUMMARY OF THE INVENTION
It is a generic object of the present invention to provide a plastic container for fluids submitted to pressures over about 5 bar, provided with at least one metallic insert defining a nozzle for coupling a cap and/or an external tubing.
It is a more specific object of the present invention to provide a container construction of the type as defined above, which ensures adequate fluid-tightness between each metallic insert and the plastic bottle of the container under high internal pressures to which the latter is submitted.
The plastic container for pressurized fluids of the invention is of the type which comprises a hollow body in plastic material, w
REFERENCES:
patent: 3312575 (1967-04-01), Corbin, Jr.
patent: 3449182 (1969-06-01), Wiltshire
patent: 3843010 (1974-10-01), Morse et al.
patent: 4588106 (1986-05-01), Stark et al.
patent: 4690295 (1987-09-01), Wills
patent: 4778073 (1988-10-01), Ehs
patent: 4785956 (1988-11-01), Kepler et al.
da Fonseca, Jr. Mario
Gandara Ramon Fernandez
Moreira Guilherme JosePires
Fibrasynthetica do Brasil Ltda.
Moy Joseph M.
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