Permeation tube for delivering fluid at a constant flow rate independent of ambient temperature variations
First Claim
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1. A method of providing a controlled rate of flow from a supply of stored chemical to enable provision of a controlled flow rate of a permeable gas comprising the steps of:
- (a) storing the supply of stored chemical in a closed storage chamber;
(b) delivering the stored chemical supply from the storage chamber through a first permeable membrane providing permeate therethrough at a first rate;
(c) directing the flowing permeate delivered at a first rate to a second permeable membrane and therethrough at a second rate which is less than the first rate; and
(d) regulating the pressure of the permeate between the first and second permeable membranes.
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Abstract
This disclosure features a permeation storage chamber in a tube having a first membrane delivering a permeate flow into an intermediate chamber. This chamber delivers flow from a second membrane. The intermediate chamber delivers surplus permeate out through a pressure regulator, or a drain tube. Pressure stabilization at the second membrane enables constant permeation discharge, avoiding pressure or temperature dependent flow rate charges.
24 Citations
37 Claims
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1. A method of providing a controlled rate of flow from a supply of stored chemical to enable provision of a controlled flow rate of a permeable gas comprising the steps of:
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(a) storing the supply of stored chemical in a closed storage chamber; (b) delivering the stored chemical supply from the storage chamber through a first permeable membrane providing permeate therethrough at a first rate; (c) directing the flowing permeate delivered at a first rate to a second permeable membrane and therethrough at a second rate which is less than the first rate; and (d) regulating the pressure of the permeate between the first and second permeable membranes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A permeation tube comprising:
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(a) a closed storage chamber containing a stored chemical supply; (b) a first permeable membrane exposed to said stored chemical supply; (c) an intermediate chamber located to receive intermediate chamber permeate from said first permeable membrane; (d) a second permeable membrane exposed to said intermediate chamber provided with said intermediate chamber permeate to enable said intermediate chamber permeate to flow through said second membrane; and (e) a pressure control mechanism regulating pressure in said intermediate chamber. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification