CN103723684B - Oxygen generator with cyclic filtration function - Google Patents
Oxygen generator with cyclic filtration function Download PDFInfo
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- CN103723684B CN103723684B CN201310688402.0A CN201310688402A CN103723684B CN 103723684 B CN103723684 B CN 103723684B CN 201310688402 A CN201310688402 A CN 201310688402A CN 103723684 B CN103723684 B CN 103723684B
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Abstract
The invention discloses an oxygen generator with a cyclic filtration function. Closing of switches and valves is controlled by a CPU (Central Processing Unit) to prepare oxygen in two different concentrations, namely first-concentration oxygen and second-concentration oxygen, wherein the concentration of the first-concentration oxygen is lower than that of the second-concentration oxygen; and since parameters can be changed during oxygen generation or errors are produced due to equipment reasons, a first oxygen sensor and a second oxygen sensor can make a judgment to store the oxygen in corresponding oxygen storage tanks according to the different concentrations. The oxygen in the different concentrations can be selected according to a particular service environment, and the generator is simple to use. Even if an oxygen generation channel is broken, another oxygen generation channel can continue generating the oxygen, an oxygen lack phenomenon due to the damage of equipment in the half way is avoided, and the service life of the equipment is prolonged due to the two oxygen generation channels. The CPU can control the fifth switch to allow the equipment to circularly filter the low-concentration oxygen, so that the high-concentration oxygen can be obtained quickly, and the equipment is more flexible to use.
Description
Technical field
The present invention relates to a kind of oxygenerator of filtration capable of circulation.
Background technology
Oxygenerator can be used for medical treatment, chemical industry, highlands, metallurgy, papermaking, biotechnology etc. every field, stricter to the concentration requirement of oxygen in some application of wherein medical treatment, chemical industry, metallurgy, biotechnology, chemical reaction can be affected if oxygen concentration is too high or causes " oxygen intoxication " phenomenon, also can affect chemical reaction if oxygen concentration is too low or causes " anoxic " phenomenon.In addition, the oxygenerator of existing design only has an oxygen container, and the oxygen concentration of output is unstable and application condition is large, is unfavorable for maintaining best oxygen concentration state, so cause the insufficient of chemical reaction or production efficiency low.
Summary of the invention
For the problems referred to above, the invention provides a kind of oxygenerator of filtration capable of circulation, can be divided in different oxygen containers according to concentration to obtained oxygen, but also can circulating filtration be carried out to the oxygen of obtained lower concentration thus obtain the oxygen of high density fast, further, oxygen concentration in environment is monitored, makes environment maintain preferably oxygen concentration.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
The oxygenerator of filtration capable of circulation, it is characterized in that, comprise the air filter be connected in turn, admission air silencer, compressor, condenser, throttling valve, first point of gas control valve and second point of gas control valve is provided with between described condenser and throttling valve, described first point of gas control valve is connected with CPU with second point of gas control valve, described first point of gas control valve is connected with the first pneumavalve, described first pneumavalve is connected with the first adsorbing tower with molecular sieve, described second point of gas control valve is connected with the second pneumavalve, described second pneumavalve is connected with the second adsorbing tower with molecular sieve, described first pneumavalve is connected with exhaust snubber with the outlet of the second pneumavalve, equalizing valve is provided with between described first adsorbing tower with molecular sieve and the second adsorbing tower with molecular sieve, described equalizing valve is connected with CPU, described first adsorbing tower with molecular sieve is connected with the first oxygen sensor, described second adsorbing tower with molecular sieve is connected with the second oxygen sensor, described first oxygen sensor is connected with the 3rd switch with the first switch respectively, first oxygen container collects the oxygen of the first concentration by the first switch and the first check valve, second oxygen container collects the oxygen of the second concentration by the 3rd switch and the 3rd check valve, described second oxygen sensor is connected with the 4th switch with second switch respectively, first oxygen container collects the oxygen of the first concentration by second switch and the second check valve, second oxygen container collects the oxygen of the second concentration by the 4th switch and the 4th check valve, first concentration is less than the second concentration, described first oxygen container is connected with air filter by the 5th switch, described first switch, second switch, 3rd switch, 4th switch is all connected with CPU with the 5th switch, described first oxygen container is connected with relief valve, strainer, oxygen flow meter, humidifying cup successively with the outlet of the second oxygen container, finally discharge through oxygen exhaust, described relief valve is connected with CPU, described oxygenerator also comprises operating panel, described operating panel is provided with the button one and button two that are connected with CPU.Preferred described oxygenerator also comprises the 3rd oxygen sensor of oxygen concentration in measurement environment, and described 3rd oxygen sensor is connected with CPU.
The closed of each switch and valve is control by CPU, the oxygen of obtained two kinds of different concns, the i.e. oxygen of the first concentration and the oxygen of the second concentration, wherein the oxygen concentration of the first concentration is lower than the oxygen of the second concentration, because parameters in oxygen preparation can change, or the reason of equipment causes error, can be judged by the first oxygen sensor and the second oxygen sensor, according to different concentration, oxygen is stored in corresponding oxygen container.The oxygen of different concns can be selected according to concrete environment for use, use simple.Even if there is an oxygen passage to break, also have another one oxygen passage to continue oxygen, avoid equipment midway to damage and cause anoxia phenomenon, two oxygen passages add the work-ing life of equipment.In addition, for the use field of the oxygen of demand high density, can control the 5th switch by CPU and make equipment carry out circulating filtration to the oxygen of lower concentration, can obtain the oxygen of high density fast, equipment use is more flexible.3rd oxygen sensor is used for oxygen concentration real-time in feedback environment, facilitates CPU to control the closed of relief valve, and then maintains preferably oxygen concentration.
The invention has the beneficial effects as follows: can be divided in different oxygen containers according to concentration to obtained oxygen, but also can circulating filtration be carried out to the oxygen of obtained lower concentration thus obtain the oxygen of high density fast, further, oxygen concentration in environment is monitored, makes environment maintain preferably oxygen concentration.Easy to use, handiness is higher.
Accompanying drawing explanation
Fig. 1 is the structural representation of the oxygenerator of the present invention's filtration capable of circulation;
Fig. 2 is the effect diagram of adsorption cycle to oxygen concn;
Fig. 3 all presses the time to the effect diagram of oxygen concn;
Fig. 4 is the effect diagram of rate of discharge to oxygen concn;
Fig. 5 is adsorption cycle and the correlation diagram of all pressing the time;
Fig. 6 is the correlation diagram of adsorption cycle and rate of discharge.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described in further detail, can better understand the present invention to make those skilled in the art and can be implemented, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, the oxygenerator of filtration capable of circulation, comprise the air filter be connected in turn, admission air silencer, compressor, condenser, throttling valve, first point of gas control valve and second point of gas control valve is provided with between described condenser and throttling valve, described first point of gas control valve is connected with CPU with second point of gas control valve, described first point of gas control valve is connected with the first pneumavalve, described first pneumavalve is connected with the first adsorbing tower with molecular sieve, described second point of gas control valve is connected with the second pneumavalve, described second pneumavalve is connected with the second adsorbing tower with molecular sieve, described first pneumavalve is connected with exhaust snubber with the outlet of the second pneumavalve, equalizing valve is provided with between described first adsorbing tower with molecular sieve and the second adsorbing tower with molecular sieve, described equalizing valve is connected with CPU, described first adsorbing tower with molecular sieve is connected with the first oxygen sensor, described second adsorbing tower with molecular sieve is connected with the second oxygen sensor, described first oxygen sensor is connected with the 3rd switch with the first switch respectively, first oxygen container collects the oxygen of the first concentration by the first switch and the first check valve, second oxygen container collects the oxygen of the second concentration by the 3rd switch and the 3rd check valve, described second oxygen sensor is connected with the 4th switch with second switch respectively, first oxygen container collects the oxygen of the first concentration by second switch and the second check valve, second oxygen container collects the oxygen of the second concentration by the 4th switch and the 4th check valve, first concentration is less than the second concentration, described first oxygen container is connected with air filter by the 5th switch, described first switch, second switch, 3rd switch, 4th switch is all connected with CPU with the 5th switch, described first oxygen container is connected with relief valve, strainer, oxygen flow meter, humidifying cup successively with the outlet of the second oxygen container, finally discharge through oxygen exhaust, described relief valve is connected with CPU, described oxygenerator also comprises operating panel, described operating panel is provided with the button one and button two that are connected with CPU.Preferred described oxygenerator also comprises the 3rd oxygen sensor of oxygen concentration in measurement environment, and described 3rd oxygen sensor is connected with CPU.
Its specific works process is as follows: first air filters through air filter, filter out koniology and solid impurity, admission air silencer can reduce noise, air is successively through overdraft and condensation, the liquid produced is atomized discharge by throttling valve, remaining part enters first point of gas control valve or second point of gas control valve by the control of CPU, nitrogen is wherein discharged by the first pneumavalve and the second pneumavalve, same, in order to reduce noise, venting port is provided with exhaust snubber, in air, remaining composition will be transported to the first adsorbing tower with molecular sieve by the first pneumavalve and the second pneumavalve or the second adsorbing tower with molecular sieve carries out final oxygen and nitrogen separation, wherein the first adsorbing tower with molecular sieve or the second adsorbing tower with molecular sieve are made up of the molecular sieve of selective adsorption nitrogen.Nitrogen after first adsorbing tower with molecular sieve is separated is transported to the first pneumavalve and the second pneumavalve and finally discharges through exhaust snubber.
Oxygen after first adsorbing tower with molecular sieve is separated carries out the measurement of oxygen concentration through the first oxygen sensor, CPU controls the closed of the first switch and the 3rd switch according to the concentration of feedback, namely when the concentration value of oxygen reaches the value of setting, such as be greater than the second concentration, then CPU controls the first switch disconnection, the 3rd switch opens; When the concentration value of oxygen is less than the value of setting, then CPU controls the first switch opens, and the 3rd switch disconnects.Same, oxygen after second adsorbing tower with molecular sieve is separated carries out the measurement of oxygen concentration through the second oxygen sensor, CPU is according to the concentration control second switch of feedback and the closed of the 4th switch, namely when the concentration value of oxygen reaches the value of setting, such as be greater than the second concentration, then CPU controls second switch disconnection, the 4th switch opens; When the concentration value of oxygen is less than the value of setting, then CPU control second switch is opened, and the 4th switch disconnects.Final first oxygen container stores the oxygen of lower concentration, the oxygen of the second oxygen container store high concentrations.
In addition, for the use field of the oxygen of demand high density, the 5th switch opens can be control by CPU, it should be noted that the 5th is also provided with the 5th check valve between switch and air filter, succinct in order to picture, do not illustrate, this is the general knowledge of this area.The oxygen of the lower concentration in the first oxygen container enters air filter and carries out next circulating filtration, and then can obtain the oxygen of high density at short notice, and equipment use is more flexible.3rd oxygen sensor is used for oxygen concentration real-time in feedback environment, facilitates CPU to control the closed of relief valve, and then maintains preferably oxygen concentration.
Wherein, adsorption cycle, all press time, outlet oxygen pressure and system working pressure all to affect the concentration of obtained oxygen, therefore can control the closed of each switch and valve by CPU, the oxygen of obtained two kinds of different concns.Its concrete influence factor is as follows:
1) take oxygen concn as research object, adopt and experimentally investigate adsorption cycle in circulation oxygen preparation, all press time and rate of discharge on the impact of oxygen concn.
The compressor power of experiment oxygenerator is about 280W, and single tower molecular sieve consumption is 0.6Kg, and the aspect ratio of adsorption tower is 5.6, and molecular sieve uses LiX type, test ambient temperature 25 degree.The oxygen concn tester used requires the time of response to be less than 8 seconds.Adsorption cycle adopts these 7 parameters of 5S, 6S, 7S, 8S, 9S, 10S, 11S, 12S, 13S, all press the time adopt 0.4S, 0.6S, 0.7S, 0.8S, 0.9, these 8 time parameters of 1.1S, 1.3S, 1.5S, outlet oxygen flow adopts these 4 flows of 1L/2L/3L/4Lmin, concrete outcome is in table 1 and table 2, and wherein each state verification is averaged for 3 times.
Table 1, all press time and rate of discharge and corresponding oxygen concn
Table 2, adsorption cycle and rate of discharge and corresponding oxygen concn
2) experiment of single factor data analysis
A) adsorption cycle impact: the data set adopting 2L/min in table 2, with polynomial expression nonlinear least-square curve simulation, all presses the 0.8S that remains unchanged.The simulation curve of 4 groups of data and the very similar of 2L/min, reduce again along with adsorption cycle increases after oxygen concn increases before this, there is an extreme point, particular content is shown in Fig. 2.The analysis of causes: the pressure of adsorption bed changes between 0 ~ 0.2MPs in the working cycle of the sorption and desorption of molecular sieve oxygen generation.In this pressure range, molecular sieve can regard linear relationship as to the absorption of nitrogen.When adsorption cycle is shorter, switch pressure also lower, the adsorptive capacity of molecular sieve to nitrogen is few, so oxygen-producing amount is also less.Adsorption cycle is short in addition, and the sorption and desorption time just shortens, and sorption and desorption is incomplete, so oxygen concn is also lower.When adsorption cycle increases, switching pressure also increases, and the sorption and desorption time also increases, and sorption and desorption is more abundant, so produce oxygen and oxygen concn increase.After oxygen level reaches maximum value, then increase adsorption cycle, the absorption of molecular sieve to nitrogen reaches capacity, and nitrogen will puncture molecular sieve and oxygen content is reduced.Best adsorption cycle can be found by experiment.
B) all press the impact of time: the data set adopting 2L/min in table 1, with polynomial expression nonlinear least-square curve simulation, adsorption cycle remains unchanged 8S.The simulation curve of 4 groups of data and the very similar of 2L/min, particular content is shown in Fig. 3, slowly reduces again, there is an extreme point along with the time of all pressing increases after oxygen concn first increases.The analysis of causes: adsorption column outlet place is the oxygen of high-content, when adsorption tower switches because the exit oxygen level of another adsorption tower (desorb is complete) just entering adsorbed state is increase of starting from scratch, the oxygen concn causing oxygen exhaust in this process has the phenomenon of an instantaneous minimizing.Equal baric flow journey is exactly before adsorption cycle terminates, allow the current adsorption tower being in adsorbed state continue absorption, and makes the complete adsorption tower of another desorb also enter adsorbed state simultaneously, would not have the phenomenon of minimizing like this at the oxygen concn of oxygen exhaust.Have two kinds for the mode of all pressing, one is single-ended all pressures (adsorption tower inlet end), and another kind is that two ends are all pressed.Single-ended all pressure is generally utilize sorption and desorption Controlling solenoid valve to carry out the control of time and sequential at inlet end, and both-end is all pressed and will be increased a magnetic valve in outlet side.Experiment proves that the rate of recovery that both-end is all pressed and oxygen level are all higher than single-ended equal baric flow journey.Both-end is all pressed and the equal pressure electromagnetic valve in outlet side can be utilized to extend all press the time (time of setting up a call), and after all having pressed, wherein a part of product oxygen enters and starts in the adsorption tower of desorb, strengthens washing adsorption bed blowback thus improving the desorb degree in tower.All the time is pressed to have certain value, after having exceeded definite value, oxygen level no longer improves, because the Nitrogen adsorption capacity of the adsorption tower be not desorbed is saturated along with all pressing time lengthening to enter, blowback cleaning will be used up a part of product oxygen in addition, so the time of all pressing oversizely can reduce oxygen level on the contrary.
C) impact of rate of discharge: the data set adopting adsorption cycle 8S in table 2, all presses the 0.8S that remains unchanged.Simulate rate of discharge to the relation curve of oxygen concn, as shown in Figure 4.Oxygen concn can improve along with the minimizing of rate of discharge as can see from Figure 4, but can reduce along with flow and reduce again after arriving certain value.The analysis of causes: because the pressure in adsorption tower be by charge flow rate with go out the pressure difference that airshed formed and caused, reduce airshed emotionally condition be just equivalent to add the pressure on ground in adsorption tower, if adsorption cycle and all press time constant situation can increase along with the reduction oxygen level of rate of discharge, but reduce rate of discharge further to certain value, can see from the graph when lower than 1.5L/min, because the oxygen of high density in adsorption tower can not flow out adsorption tower in time, the air newly entering adsorption tower is caused fully not adsorb, unnecessary nitrogen causes the reduction of oxygen level.
3) multifactorial association impact analysis
We study and find that it is not single for affecting oxygen level factor, and it is the coefficient result of multiple factor.Our research work mainly how under multifactor effect, to find optimal balance point.
A) adsorption cycle affects with all pressing associating of time: our experimental data remained on use table 1 and table 2 is done one group of adsorption cycle and all pressed the time to the graph of relation of oxygen level, as shown in Figure 5.The vertex of time effects oxygen level is all pressed to be do not change with adsorption cycle as can see from Figure 5 in graphic representation.All pressing in time 0 ~ 0.6S time period, the rate of rise of the most smooth adsorption cycle 5S and 11S of the rate of rise in optimal adsorption cycle is far longer than the slope of 8S, that is adsorption cycle and the best all press that time difference is larger to be changed more responsive to oxygen level, select the best all to press time and adsorption cycle that oxygen level variable effect can be made minimum.
B) adsorption cycle affects with associating of rate of discharge, as shown in Figure 6: tracing analysis: adsorption cycle 8S, when rate of discharge is less than 1.5L/min, also increase is had along with pressure increases oxygen level, start to become mild close to oxygen level change after the rate of discharge of 2L/min, because this time adsorption cycle and adsorption tower internal pressure match, in adsorption time, nitrogen is fully adsorbed, thus change rate of discharge obviously can not affect oxygen level.Adsorption cycle 5S, because air is short at absorption dwell time in the tower, now rate of discharge minimizing just adds tower internal pressure, so oxygen level can increase thereupon, and because now adsorption time is short after rate of discharge reaches 2L/min, tower internal pressure increases along with rate of discharge and reduces, and nitrogen is reduced by the capacity adsorbed, and therefore oxygen level also just increases along with rate of discharge and reduces.For adsorption cycle 11S, because switching time is long, after rate of discharge reaches 2L/min, because Nitrogen adsorption capacity is saturated, unnecessary nitrogen is because can not be entered by adsorbing in product oxygen, so oxygen level also can reduce.
C) all press the time to affect as can be seen from Table 1 with associating of rate of discharge, select the best all to press the time, rate of discharge does not almost affect oxygen level.Do not increase and all press the time, time rate of discharge is smaller, oxygen level is higher, along with rate of discharge increases, when being switched to the adsorption tower of desorption and regeneration, new tower at short notice oxygen level is lower, and the low oxygen content oxygen that all outlet ports flow enters more greatly oxygen container is more.
4) determine desirable adsorption cycle and all press the time
Data and theoretical analysis by experiment, has made adsorption cycle clear and has all pressed the relation of time and oxygen concn, determines desirable adsorption cycle and all the pressure time provides reliable foundation for us.
Along with adsorption cycle increases, producing oxygen concn first increases rear reduction, has an extreme point;
Having all pressure and nothing all to press affects comparatively large on producing oxygen concn, then slowly reducing, there is an extreme point along with all pressing time increase oxygen level first to increase.And optimum point is not mobile with the change of adsorption cycle;
Adsorption cycle, all change of pressure time and rate of discharge all have impact to oxygen level, and adsorption cycle is larger, more responsive to oxygen level change;
The factor of oxygen concn is affected respectively: adsorption cycle > all presses time > rate of discharge by data analysis.Those skilled in the art can according to specification sheets and accompanying drawing, the oxygen of two kinds of different concns is obtained by the control of CPU, do not repeat them here, use for the ease of user, by the signal of button one to the oxygen of obtained first concentration of CPU input, the signal of the oxygen of the second concentration can be obtained to CPU input by button two.CPU the switch of relief valve and the first oxygen container and the second oxygen container according to the signal control of input simultaneously, and final oxygen is transported in the environment of needs through strainer, oxygen flow meter, humidifying cup, oxygen exhaust successively.
The closed of each switch and valve is control by CPU, the oxygen of obtained two kinds of different concns, the i.e. oxygen of the first concentration and the oxygen of the second concentration, wherein the oxygen concentration of the first concentration is lower than the oxygen of the second concentration, because parameters in oxygen preparation can change, or the reason of equipment causes error, can be judged by the first oxygen sensor and the second oxygen sensor, according to different concentration, oxygen is stored in corresponding oxygen container.The oxygen of different concns can be selected according to concrete environment for use, use simple.Even if there is an oxygen passage to break, also have another one oxygen passage to continue oxygen, avoid equipment midway to damage and cause anoxia phenomenon, two oxygen passages add the work-ing life of equipment.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification sheets of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.
Claims (2)
1. the oxygenerator of filtration capable of circulation, it is characterized in that, comprise the air filter be connected in turn, admission air silencer, compressor, condenser, throttling valve, first point of gas control valve and second point of gas control valve is provided with between described condenser and throttling valve, described first point of gas control valve is connected with CPU with second point of gas control valve, described first point of gas control valve is connected with the first pneumavalve, described first pneumavalve is connected with the first adsorbing tower with molecular sieve, described second point of gas control valve is connected with the second pneumavalve, described second pneumavalve is connected with the second adsorbing tower with molecular sieve, described first pneumavalve is connected with exhaust snubber with the outlet of the second pneumavalve, equalizing valve is provided with between described first adsorbing tower with molecular sieve and the second adsorbing tower with molecular sieve, described equalizing valve is connected with CPU, described first adsorbing tower with molecular sieve is connected with the first oxygen sensor, described second adsorbing tower with molecular sieve is connected with the second oxygen sensor, described first oxygen sensor is connected with the 3rd switch with the first switch respectively, first oxygen container collects the oxygen of the first concentration by the first switch and the first check valve, second oxygen container collects the oxygen of the second concentration by the 3rd switch and the 3rd check valve, described second oxygen sensor is connected with the 4th switch with second switch respectively, first oxygen container collects the oxygen of the first concentration by second switch and the second check valve, second oxygen container collects the oxygen of the second concentration by the 4th switch and the 4th check valve, first concentration is less than the second concentration, described first oxygen container is connected with air filter by the 5th switch, described first switch, second switch, 3rd switch, 4th switch is all connected with CPU with the 5th switch, described first oxygen container is connected with relief valve, strainer, oxygen flow meter, humidifying cup successively with the outlet of the second oxygen container, finally discharge through oxygen exhaust, described relief valve is connected with CPU, described oxygenerator also comprises operating panel, described operating panel is provided with the button one and button two that are connected with CPU.
2. the oxygenerator of filtration capable of circulation according to claim 1, is characterized in that, also comprises the 3rd oxygen sensor of oxygen concentration in measurement environment, and described 3rd oxygen sensor is connected with CPU.
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| CN104071753B (en) * | 2014-06-05 | 2017-08-15 | 上海冠瑞医用电子有限公司 | A kind of oxygen generation system, method and oxygenerator |
| CN110320836B (en) * | 2019-07-06 | 2022-03-11 | 科迈（常州）电子有限公司 | Oxygenerator switching time sequence control method based on pressure control |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2540188Y (en) * | 2002-04-17 | 2003-03-19 | 中国科学院沈阳自动化研究所 | Small medical oxygenerator with oxygen concentration detection function |
| US20040040439A1 (en) * | 2002-08-27 | 2004-03-04 | Litton Systems, Inc. | Oxygen concentrator system |
| CN203699898U (en) * | 2013-12-13 | 2014-07-09 | 科迈（常州）电子有限公司 | Oxygen generator capable of filtering circularly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10104190A (en) * | 1996-09-26 | 1998-04-24 | Nippon Rufuto Kk | Oxygen concentration detection method using oxygen sensor, abnormality judging method of oxygen sensor, abnormality judging method of oxygen concentrator and oxygen concentrator |
| JP2002219176A (en) * | 2001-01-25 | 2002-08-06 | Fukuda Sangyo:Kk | Oxygen concentrator for medical treatment |
| JP2003286009A (en) * | 2002-03-28 | 2003-10-07 | Ngk Spark Plug Co Ltd | Oxygen concentrator |
| JP2005111021A (en) * | 2003-10-09 | 2005-04-28 | Terumo Corp | Oxygen concentrator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2540188Y (en) * | 2002-04-17 | 2003-03-19 | 中国科学院沈阳自动化研究所 | Small medical oxygenerator with oxygen concentration detection function |
| US20040040439A1 (en) * | 2002-08-27 | 2004-03-04 | Litton Systems, Inc. | Oxygen concentrator system |
| CN203699898U (en) * | 2013-12-13 | 2014-07-09 | 科迈（常州）电子有限公司 | Oxygen generator capable of filtering circularly |
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