| 描述： | Recorded in my dad's bedroom with Lifecam HD3000 Webcam.This is a much better recording than my previous oxygen concentrator file, as I hauled my desktop into the bedroom at the other end of the apartment where the machine now is, when I was home alone. The webcam is on the bed about 3 or 4 feet from the machineAt the beginning of the file you hear me flip the big switch and the machine comes on with a long on beep and thumps. I edited it to start then.At 00:1.8 what I suspect is the water pump comes on, though I may be wrong. That's when the gurgling starts though. The machine has a small reservoir for distilled water to moisten the airflow. A cup or two lasts several daysYou'll hear various hisses and thumps in a 15.6 second cycle as it runs.At 03:03 I flip the big switch to shut the machine off, and it bubbles and gurgles away for the rest of the file, as water I assume slowly perculates back into the reservoir, the bubbling getting quieter and quieter until it doesn't even sound like bubbling anymore, until it finally ticks to a stop. At 03:16 you hear me step as I get my foot loose from the mic cord lol.at 04:13 the furnace shuts down as a car finishes going by outside in the bass register, faint traffic noises and the furnace being the only background noises you'll hear aside from my moving around a couple times, and a faint bluejay at the end.At about 07:00 you can barely hear the machine anymore, but I could hear a faint ticking with my own ears.At 07:04 The furnace comes back on.At 07:08 you'll hear a bluejay faintly calling outside and a car going by outside after, which finishes the file at 07:20. I edited out my walking to the computer to shut the recording down.From WikipediaOxygen concentrators typically use pressure swing adsorption technology and are used very widely for oxygen provision in healthcare applications, especially where liquid or pressurised oxygen is too dangerous or inconvenient, such as in homes or in portable clinics.Oxygen concentrators are also used to provide an economical source of oxygen in industrial processes, where they are also known as oxygen gas generators or oxygen generation plants. Oxygen concentrators utilize a molecular sieve to adsorb gasses and operate on the principle of rapid pressure swing adsorption of atmospheric nitrogen onto zeolite minerals and then venting the nitrogen. This type of adsorption system is therefore functionally a nitrogen scrubber leaving the other atmospheric gasses to pass through. This leaves oxygen as the primary gas remaining. PSA technology is a reliable and economical technique for small to midscale oxygen generation, with cryogenic separation more suitable at higher volumes and external delivery generally more suitable for small volumes.At high pressure, the porous zeolite adsorbs large quantities of nitrogen, due to its large surface area and chemical character. After the oxygen and other free components are collected the pressure drops which allows nitrogen to desorb.An oxygen concentrator has an air compressor, two cylinders filled with zeolite pellets, a pressure equalizing reservoir, and some valves and tubes. In the first halfcycle the first cylinder receives air from the compressor, which lasts about 3 seconds. During that time the pressure in the first cylinder rises from atmospheric to about 1.5 times normal atmospheric pressure (typically 20 psi/138 kPa gauge, or 1.36 atmospheres absolute) and the zeolite becomes saturated with nitrogen. As the first cylinder reaches near pure oxygen (there are small amounts of argon, CO2, water vapour, radon and other minor atmospheric components) in the first halfcycle, a valve opens and the oxygen enriched gas flows to the pressure equalizing reservoir, which connects to the patient's oxygen hose. At the end of the first half of the cycle, there is another valve position change so that the air from the compressor is directed to the 2nd cylinder. Pressure in the first cylinder drops as the enriched oxygen moves into the reservoir, allowing the nitrogen to be desorbed back into gas. Part way through the second half of the cycle there is another valve position change to vent the gas in the first cylinder back into the ambient atmosphere, keeping the concentration of oxygen in the pressure equalizing reservoir from falling below about 90. The pressure in the hose delivering oxygen from the equalizing reservoir is kept steady by a pressure reducing valve.Older units cycled with a period of about 20 seconds, and supplied up to 5 litres per minute of 90+ oxygen. Since about 1999, units capable of supplying up to 10 lpm have been available. |