Air oxygen and nitrogen concentration device

Claim 1

A system for producing oxygen enriched gas and oxygen depleted gas, said system comprising: a source of pressurized air; a tubular housing having an opening at one end to receive pressurized air from said source; a first plurality of hollow fibers disposed in said housing and having a fixed short length to receive pressurized air from the opening at one end of said housing to produce a high pressure rapid flow of air therethrough for a high rate of oxygen permeation thereacross without significant permeation of nitrogen, said tubular housing including an opening therein to remove the permeated oxygen enriched gas from said housing; a second plurality of hollow fibers disposed in said housing downstream of said first plurality of hollow fibers to receive oxygen depleted pressurized air therefrom and permeate oxygen therethrough, said second plurality of hollow fibers having a fixed length substantially greater than the fixed short length of said first plurality of hollow fibers to expose the oxygen depleted pressurized air to permeation in the hollow fibers for a greater period of time; and a perforated tube disposed amongst the second plurality of hollow fibers to wash the hollow fibers with ambient air to remove oxygen permeated therethrough and reduce the pressure at the exterior of the hollow fibers to enhance permeation therethrough, said tubular housing including openings to remove the mixture of permeated oxygen enriched gas and air from the perforated tube from said housing and to remove the oxygen depleted gas from the second plurality of hollow fibers.

Claim 2

A system for producing oxygen enriched gas and oxygen depleted gas, said system comprising: a source of pressurized air; a tubular housing having an opening at one end to receive pressurized air from said source; a first plurality of hollow fibers disposed in said housing and having a fixed short length to receive pressurized air from the opening at one end of said housing to produce a high pressure rapid flow of air therethrough for a high rate of oxygen permeation thereacross without significant permeation of nitrogen, said tubular housing including an opening therein to remove the permeated oxygen enriched gas from said housing; a second plurality of hollow fibers disposed in said housing downstream of said first plurality of hollow fibers to receive oxygen depleted pressurized air therefrom and permeate oxygen therethrough, said second plurality of hollow fibers having a fixed length substantially greater than the fixed short length of said first plurality of hollow fibers to expose the oxygen depleted pressurized air to permeation in the hollow fibers for a greater period of time; and a perforated tube disposed amongst the second plurality of hollow fibers to wash the hollow fibers with ambient air to remove oxygen permeated therethrough and reduce the pressure at the exterior of the hollow fibers to enhance permeation therethrough, said tubular housing including openings to remove the mixture of permeated oxygen enriched gas and air from the perforated tube from said housing and to remove the oxygen depleted gas from the second plurality of hollow fibers.

Claim 3

A system for producing oxygen enriched gas and oxygen depleted gas, said system comprising: a source of pressurized air; a tubular housing having an opening at one end to receive pressurized air from said source; a first plurality of hollow fibers disposed in said housing and having a fixed short length to receive pressurized air from the opening at one end of said housing to produce a high pressure rapid flow of air therethrough for a high rate of oxygen permeation thereacross without significant permeation of nitrogen, said tubular housing including an opening therein to remove the permeated oxygen enriched gas from said housing; a second plurality of hollow fibers disposed in said housing downstream of said first plurality of hollow fibers to receive oxygen depleted pressurized air therefrom and permeate oxygen therethrough, said second plurality of hollow fibers having a fixed length substantially greater than the fixed short length of said first plurality of hollow fibers to expose the oxygen depleted pressurized air to permeation in the hollow fibers for a greater period of time; a perforated tube disposed amongst the second plurality of hollow fibers to wash the hollow fibers with ambient air to remove oxygen permeated therethrough and reduce the pressure at the exterior of the hollow fibers to enhance permeation therethrough, said tubular housing including an opening to remove the mixture of permeated oxygen enriched gas and air from the perforated tube from said housing; a third plurality of hollow fibers disposed in said housing downstream of said second plurality of hollow fibers to receive further oxygen depleted pressurized air therefrom and permeate oxygen therethrough, said third plurality of hollow fibers having a fixed length substantially greater than the fixed short length of said first plurality of hollow fibers to expose the further oxygen depleted pressurized air to permeation in the hollow fibers for a greater period of time, said tubular housing including openings to remove the permeated gas from said third plurality of hollow fibers and to remove the further oxygen depleted gas from the third plurality of fibers; and pump means to facilitate removal of the mixture of permeated oxygen enriched gas and air from the second plurality of hollow fibers and the permeated oxygen enriched gas from the third plurality of hollow fibers.

Claim 4

A system for producing oxygen enriched gas and oxygen depleted gas, said system comprising: a source of pressurized air; a tubular housing having an opening at one end to receive pressurized air from said source; a first plurality of hollow fibers disposed in said housing and having a fixed short length to receive pressurized air from the opening at one end of said housing to produce a high pressure rapid flow of air therethrough for a high rate of oxygen permeation thereacross without significant permeation of nitrogen, said tubular housing including an opening therein to remove the permeated oxygen enriched gas from said housing; a second plurality of hollow fibers disposed in said housing downstream of said first plurality of hollow fibers to receive oxygen depleted pressurized air therefrom and permeate oxygen therethrough, said second plurality of hollow fibers having a fixed length substantially greater than the fixed short length of said first plurality of hollow fibers to expose the oxygen depleted pressurized air to permeation in the hollow fibers for a greater period of time; a perforated tube disposed amongst the second plurality of hollow fibers to wash the hollow fibers with ambient air to remove oxygen permeated therethrough and reduce the pressure at the exterior of the hollow fibers to enhance permeation therethrough, said tubular housing including an opening to remove the mixture of permeated oxygen enriched gas and air from the perforated tube from said housing; a third plurality of hollow fibers disposed in said housing downstream of said second plurality of hollow fibers to receive further oxygen depleted pressurized air therefrom and permeate oxygen therethrough, said third plurality of hollow fibers having a fixed length substantially greater than the fixed short length of said first plurality of hollow fibers to expose the further oxygen depleted pressurized air to permeation in the hollow fibers for a greater period of time, said tubular housing including openings to remove the permeated gas from said third plurality of hollow fibers and to remove the further oxygen depleted gas from the third plurality of fibers; and pump means to facilitate removal of the mixture of permeated oxygen enriched gas and air from the second plurality of hollow fibers and the permeated oxygen enriched gas from the third plurality of hollow fibers.