Controlled atmosphere storage system
AssigneeProlong Systems, Inc.
InventorsMax D. Liston, Sy J. Banaitis, Robert J. Olson
Life of this patent
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Abstract
The present invention is a system for maintaining a controlled oxygen atmosphere within a transport container vessel, such as a bulk rail car through the use of permeable membrane technology. An oilless compressor is used in conjunction with the system so as not to subject the permeable membranes to the derogatory effects associated with the presence of oil within an air stream that circulates through the permeable membranes. The present system further includes an air-sampling system which is used to continuously measure the oxygen levels within the rail car so as to provide verification that the oxygen levels are maintained at 5% or less to kill insects, larvae, or eggs which may be within the bulk materials transported by the rail car.
Claims21
A device for maintaining a controlled oxygen atmosphere within a transport container vessel comprising:
- a first inlet adapted to receive ambient air from outside said container;
- a compressor having a compressor intake port fluidly connected to said first inlet and a compressor exhaust port;
- a gas-separation means having an entrance port fluidly connected to said compressor exhaust port and an exit port, said compressor and said gas-separation means being collectively operable to maintain an oxygen level within said container not exceeding 5%;
- a first outlet fluidly connected to said exit port for placing said exit port in fluid communication with the interior of said container;
- a second outlet fluidly connected to said container for receiving gas from therewithin;
- a gas-analyzer means connected to said second outlet for monitoring and recording the oxygen levels of gas within the container;
- a controller assembly connected between said second outlet and said gas-analyzer means, said controller assembly being adapted to selectively draw gas from within said container into said gas-analyzer means, and said controller assembly comprising a housing, a programmable microprocessor disposed within said housing and a data storage means disposed within said housing and electrically interfaced to said gas-analyzer means.
- a control valve disposed within said housing, said control valve being electrically interfaced to said microprocessor and actuatable between first and second positions, said second outlet being fluidly connected to said control valve;
- a pump electrically interfaced to said microprocessor and fluidly connected between said control valve and said gas-analyzer means wherein activation of said pump concurrently with the actuation of said control valve to the first position by said microprocessor draws gas from within the container into the gas-analyzer means, said gas-analyzer means being operable to transmit oxygen level measurements of the gas to the data-storage means;
- a first passage fluidly connecting said first outlet to said control valve, said control valve being operable to place said first outlet in fluid communication with said gas-analyzer means via said first passage while simultaneously blocking the communication between said second outlet and said gas-analyzer means when actuated to the second position by said microprocessor, thereby allowing said gas-analyzer means to monitor the oxygen level of gas exiting said gas-separation means, said control valve being further operable to block the communication between said first passage and said gas-analyzer means when actuated to said first position.
Dependencies are inferred from the claim text.