CN215426720U - Portable oxygen-making and air-supplying device - Google Patents
Portable oxygen-making and air-supplying device Download PDFInfo
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- CN215426720U CN215426720U CN202120449645.9U CN202120449645U CN215426720U CN 215426720 U CN215426720 U CN 215426720U CN 202120449645 U CN202120449645 U CN 202120449645U CN 215426720 U CN215426720 U CN 215426720U
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Abstract
The utility model belongs to the technical field of gas separation, and particularly relates to a portable oxygen generation and supply device. The oxygen-making and air-supplying device adopts a pulse air-supplying method, can change the oxygen supply flow in unit breathing frequency along with the change of the breathing frequency, and still maintains the total oxygen supply amount in unit time; along with the change of the breathing frequency, the air supply quantity of each breathing synchronously changes, the phenomena of air cut-off and unavailable air supply can not occur, and the air supply experience is good; in addition, with the increase of the respiratory frequency, although the supplied air flow rate in the unit respiratory frequency is small, the total amount of supplied air can still maintain the original supplied air flow rate, and the blood oxygen saturation can be effectively maintained. And when the breathing frequency of air supply is reduced, the endurance time is enhanced by changing the operation load of the device. The utility model can be used safely and continuously by individual soldiers in various environments.
Description
Technical Field
The utility model belongs to the technical field of gas separation, and particularly relates to a portable individual oxygen-generating and supplying device capable of changing oxygen supply flow along with the individual respiratory frequency of personnel.
Background
With the continuous rise of altitude, the oxygen content (absolute value, g/m) in the atmosphere3) The oxygen partial pressure (pressure value, kPa) is correspondingly reduced, the oxygen content (blood oxygen saturation) in blood is reduced, the natural reaction of a human body is severe, the human body injuries such as heart rate acceleration, reaction delay, emotional impatience, immunity reduction and the like are caused, a series of problems such as headache, abdominal distension, alopecia, dyspnea, lassitude, low sleep quality, memory decline and even pulmonary edema death and the like are caused, and effective oxygen supply is a very important solution no matter whether the people are anxious combat troops, cadres and travelers of governments or industrial departments or the Tibetan people living in the world.
At present, in individual-oriented oxygen supply methods, particularly portable individual breathing oxygen supply methods, an oxygen concentrator with fixed flow is mostly adopted to directly supply air for the human body through nasal inhalation. Because the flow of the oxygen generating equipment is fixed, in order to meet the oxygen supply flow required by personnel at higher altitude, the requirement on the air supply capacity of the equipment is higher, and the design challenges of the size, the volume, the weight, the required power and the cruising power of the concentrator are huge; although some products are also coupled with the design of pulse breathing to reduce the oxygen supply amount at a unit breathing frequency and reduce the requirement of the air supply flow of the equipment, the pulse breathing gas supply method is still a quantitative output air supply method which essentially follows the breathing frequency, and when the breathing frequency is changed, the pulse breathing gas supply method is easy to fail to follow and cause oxygen supply failure. If the air supply is performed with the respiratory rate, the oxygen supply purity of the concentrator decreases due to the increase of the air supply flow rate per unit time, and the oxygen saturation of blood cannot be effectively maintained.
Disclosure of Invention
In view of the above circumstances, an object of the present invention is to provide a portable oxygen-generating and supplying apparatus for individual soldiers which can change the oxygen supply flow rate in accordance with the individual respiratory rate of the individual person.
The utility model provides a portable oxygen-making and gas-supplying device, which is a pulse gas-supplying device and can supply gas in time along with the breathing frequency: the oxygen enrichment prepared by the device is delivered to the entrance of the nose through the air supply hose, when a human body inhales air, the pressure in the pipeline can be caused to be negative pressure to a certain degree, the micro-pressure sensor arranged at the oxygen enrichment outlet can sense the negative pressure and open the air supply valve through the control system, and then the air can be rapidly supplied to the human body through the air supply hose; on the contrary, when the human body exhales, the micro-pressure sensor arranged at the oxygen-enriched outlet can sense the pressure change, and the control system closes the air supply valve to stop supplying air to the human body through the air supply hose, so that the prepared oxygen-enriched air is stored for use, and the waste of the part of air is saved.
The oxygen generation and supply device provided by the utility model can change the oxygen supply flow in unit breathing frequency along with the change of breathing frequency, and still maintain the total oxygen supply amount in unit time; along with the change of the breathing frequency, the air supply quantity of each breathing synchronously changes, the phenomena of air cut-off and unavailable air supply can not occur, and the air supply experience is good; moreover, with the increase of the breathing frequency, although the air supply flow in the unit breathing frequency is less, the total air supply amount still maintains the original air supply flow, so that the blood oxygen saturation can be effectively maintained;
moreover, the total oxygen supply amount in unit time can be maintained, the working state of the oxygen concentrator can not be changed, the oxygen concentration index can be kept stable, further, the partial pressure of oxygen supply is ensured, and the oxyhemoglobin saturation is maintained: if a certain amount of oxygen is delivered in each inspiration, when the breathing frequency is changed to be higher, the flow of the gas delivered in unit time is increased, which exceeds the oxygen production capacity of the equipment until the oxygen of the product of the oxygen production equipment is consumed, not only the purity is reduced because the oxygen production process exceeds the oxygen production capacity of the oxygen production equipment, but also the phenomena of 'gas cut-off' and 'no supply' are extremely formed, but the utility model shortens the opening time of the gas supply valve through the control system along with the increase of the breathing frequency, namely reduces the actual gas supply flow of each opening of the gas supply valve, but also maintains the average gas supply flow in unit time not to exceed the oxygen production capacity of the oxygen production equipment through the control system, so the purity of the product oxygen of the oxygen production equipment can be maintained, and the average oxygen supply quantity received by a human body is unchanged, the blood oxygen saturation is maintained, and the experience of breathing gas supply is good, solves the problems of 'gas cut-off' and 'no supply of gas'.
In addition, the oxygen generation and supply device provided by the utility model is combined with the adjustment of the oxygen generation process of the oxygen concentrator, as mentioned above, when the breathing frequency is reduced, the actual supply amount of the gas supply valve which is opened is reduced, and the oxygen which is prepared by the oxygen generation capacity equipment is stored in the oxygen buffer tank in a large amount, obviously, the surplus oxygen can be introduced into the cleaning stage to improve the oxygen supply concentration and further maintain higher oxygen concentration output. This allows for higher altitude usage for individual portable equipment.
Moreover, with the device of the present invention, when the breathing rate of the supplied air is reduced, by changing the operating load of the oxygen concentrator: the actual air supply amount is reduced by opening the air supply valve through the control system, and the load (such as the frequency) of the compressor is reduced through the control system, so that the power consumption can be reduced, and the endurance time can be prolonged. This is of great significance to individual portable equipment.
The utility model provides a portable oxygen-making and gas-supplying device, comprising:
(1) at least one compression device for supplying the necessary pressurized feed air and comprising the means required for air pre-treatment for removing impurity components from the feed gas;
(2) at least one set of pressure swing adsorption drying device, wherein the pressure swing adsorption drying device comprises an adsorption tower, one or more combinations of nitrogen adsorbents (molecular sieves) are filled in the adsorption tower, and an air inlet valve and a necessary connecting pipeline thereof, an air outlet valve and a necessary connecting pipeline thereof, a gas production valve and a necessary connecting pipeline thereof;
(3) at least one oxygen buffer tank or air bag for temporarily storing oxygen, wherein the buffer tank or air bag is communicated with the product end outlet valve of the adsorption tower and is used for receiving the oxygen enriched from the adsorption tower; and at least one loop is arranged for returning the oxygen to the product end of the adsorption tower;
(4) at least one control valve (also called as a gas supply valve) for controlling the quantitative output of oxygen is connected in series behind the oxygen buffer tank for outputting oxygen in fixed time and quantity;
(5) at least one micro-pressure sensor connected in series behind the control valve for monitoring the pressure of the oxygen supply pipeline (a hose) connected to the nasal cavity of the human body;
(6) the controller is used for controlling the starting and stopping of the power equipment, load adjustment, opening and closing of the valve, operation and the like; this is readily accomplished by those skilled in the art;
(7) at least one power supply component which can be any type of battery and can be charged and discharged to provide power for air compression equipment, a controller, a sensor and the like of the system;
(8) and necessary machine frame, machine shell, connecting pipeline, equipment chassis, heat-radiating ventilation and vibration-damping noise-reducing equipment and air-supplying hose from outlet of air-supplying electromagnetic valve to human nasal cavity.
The portable oxygen generator also comprises a battery, a frame (casing), a mounting component of the frame (casing), a connecting pipeline between devices and the like.
Based on above-mentioned portable system oxygen air feeder, the flow that carries out the air feed is as follows:
the oxygen enriched prepared by the device is sent to the suction inlet of the nose of a person through an air supply hose:
when a human body inhales air, negative pressure of a certain degree is formed in the pipeline, the micro-pressure sensor arranged at the oxygen enrichment outlet can sense the negative pressure and open the air supply valve through the control system, and air can be rapidly supplied to the human body through the air supply hose; on the contrary, when a human body exhales, the micro-pressure sensor arranged at the oxygen-enriched outlet can sense the pressure change, the air supply valve is closed through the control system, the air supply to the human body through the air supply hose is stopped, the prepared oxygen-enriched air is stored for use, and the waste of the part of air is saved;
generally, when the breathing frequency changes to be higher, the gas flow sent out in unit time will improve, and this will surpass the oxygen making ability of equipment, and until oxygen equipment product oxygen consumption is totally lost, not only because oxygen making technology itself surpasss the oxygen making ability of oxygen making equipment, the purity will descend, and extremely still can form the phenomenon of "dying of gas", "confession is not come". However, with the increase of the breathing frequency, the opening time of the air supply valve is shortened through the control system, namely the actual air supply flow rate of opening the air supply valve each time is reduced, but the average air supply flow rate per unit time is not more than the oxygen generation capacity of the oxygen generation equipment through the control system, so that the purity of the product oxygen of the oxygen generation equipment can be maintained; moreover, the average oxygen supply quantity received by the human body is unchanged, the blood oxygen saturation is maintained, the experience of breathing and air supply is good, and the problems of 'air supply interruption' and 'air supply failure' are solved.
When the breathing frequency is reduced, the actual air supply amount of the opened air supply valve is reduced, more oxygen prepared by the equipment with the same oxygen generating capacity is stored in the oxygen buffer tank, and the oxygen buffer tank is combined with the adjustment of the oxygen preparation process of the oxygen concentrator, so that the surplus oxygen can be introduced into the cleaning stage to improve the oxygen supply concentration and further maintain higher oxygen concentration output; this allows for higher altitude usage for individual portable equipment.
When the breathing frequency of air supply is reduced to be lower, the control system opens the air supply valve to reduce the actual air supply amount, and acts on the compressor through the control system to reduce the load (such as reducing the frequency) of the compressor, so that the power consumption can be reduced, and the endurance time can be prolonged.
Drawings
FIG. 1 is a schematic diagram of oxygen utilization in a continuous oxygen supply process.
FIG. 2 is a schematic diagram of the structure and process flow of the portable oxygen generation and supply device.
Detailed Description
The portable oxygen-making and gas-supplying device and the gas-supplying method of the utility model are further explained below by combining the attached drawings and the embodiment.
FIG. 1 is a schematic diagram of oxygen utilization rate of a continuous oxygen supply method:
the human body has a normal inhaling-exhaling cycle, with the inhaling time being about 1/3 and the exhaling time being about 2/3. If the traditional oxygen generator adopts a continuous oxygen supply mode, all the oxygen generated by the traditional oxygen generator is wasted (about 2/3);
in the inspiration process, due to the existence of a breathing dead space, only the oxygen inhaled in the first 2/3 period can really exchange oxygen with alveolus and is effectively utilized by the organism, and the oxygen inhaled in the later 1/3 period can only reach the respiratory tract and cannot be effectively utilized by the organism actually;
that is, in the continuous oxygen supply method, about 4/5% of oxygen is actually wasted in the exhalation process and respiratory tract, and the oxygen utilization rate is only about 20%;
in the pulse respiration method, the utilization rate of the oxygen prepared by the oxygen concentrator is close to 100 percent.
FIG. 2 is a structure and a process flow chart of the portable oxygen-making and gas-supplying device of the utility model.
In the drawings, 01A, 01B, 02A, 02B, 03A, 03B indicate automatic control valves which can be opened or closed according to preset logic, and of course, the valves can also be automatic control valves with flow control regulation performance, and the valves can be pneumatic control valves, electric control valves and hydraulic control valves;
DXF01A, DXF01AB represents check valve, can be all valves that can restrict the fluid one-way circulation;
101A and 101B are adsorption towers filled with adsorbents and molecular sieves;
PV102 represents a buffer tank, an air bag, a container capable of storing oxygen;
DDV01A represents an air supply solenoid valve, which is also referred to herein as an air supply breather valve, and can be any automatic control valve that can be opened and closed by control logic.
Some names involved are explained as follows:
the product gas refers to gas which is difficult to be adsorbed by the adsorbent, for example, for a nitrogen adsorbent, nitrogen is easy to be adsorbed, and oxygen and argon are difficult to be adsorbed;
exhaust gas, which means gas that is relatively easily adsorbed by the adsorbent with respect to product gas, such as nitrogen, moisture, etc., which is relatively easily adsorbed by the nitrogen adsorbent with respect to oxygen;
adsorbents, also known as molecular sieves, used in conventional PSA processes for producing oxygen from an air stream typically employ nitrogen adsorbents such as CaA, CaX, NaX, LiX types, etc., for the production of oxygen based on equilibrium adsorption theory;
an adsorption column, which may also be referred to as an adsorber, an adsorption bed, a separator, refers to a vessel filled with at least one adsorbent, such as those described above, having a relatively strong adsorption capacity for the more readily adsorbed components of the gas mixture;
the terms PSA, Pressure Swing Adsorption, separation, and PSA are well known to those skilled in the art, and include not only PSA methods but also methods similar to PSA methods, such as Vacuum Swing Adsorption (VSA) or Mixed Pressure Swing Adsorption (MPSA) methods. Also in a broader sense, it is understood that the periodically cycled adsorption pressure, a higher pressure, is a higher pressure relative to the desorption step, and may include pressures greater than or equal to atmospheric pressure; while the desorption pressure of the periodic cycle, a lower pressure is a lower pressure relative to the adsorption step, and includes less than or equal to atmospheric pressure.
Unless explicitly noted, the pressures referred to herein are gauge pressures.
Referring to fig. 2, a typical portable oxygen generating and supplying device structure of the present invention comprises: two adsorption towers 101A and 101B, a buffer tank or an air bag PV102 and a micro-pressure sensor; wherein:
the raw material air comes from an air compressor (not shown in the figure), the air compressor is powered by a battery, certainly, the air compressor can also be externally connected with a power supply, a control system is provided with compressed air which can change the running frequency of a compressor motor and provide different flow and pressure for a subsequent separation system, a raw material gas pipeline is respectively connected with the air inlets of the two adsorption towers 101A and 101B, the connecting pipeline of the raw material gas pipeline and the air inlet of the adsorption tower 101A is provided with an automatic control valve 01A, and the connecting pipeline of the raw material gas pipeline and the air inlet of the adsorption tower 101B is provided with an automatic control valve 01B; meanwhile, the air inlets of the two adsorption towers 101A and 101B are respectively connected with a silencer pipeline, an automatic control valve 02A is arranged on the side of the adsorption tower 101A, an automatic control valve 02B is arranged on the side of the adsorption tower 101B, and the adsorbed waste gas is discharged to the atmosphere from the silencer;
the product ends of the adsorption towers 101A and 101B are connected through a pipeline, an automatic control valve 03A is arranged on the side of the connecting pipeline close to the adsorption tower 101A, an automatic control valve 03B is arranged on the side of the connecting pipeline close to the adsorption tower 101B, and a joint between the control valve 03A and the control valve 03B is connected with an air inlet of a buffer tank or an air bag PV102 through a pipeline;
meanwhile, the product ends of the adsorption towers 101A and 101B are connected through another pipeline, a check valve DXF01A is arranged on the side of the connecting pipeline close to the adsorption tower 101A, a check valve DXF01B is arranged on the side of the connecting pipeline close to the adsorption tower 101B, and the joint between the check valve DXF01A and the check valve DXF01B is connected with an air inlet of a buffer tank or an air bag PV102 through a pipeline;
the air outlet of the buffer tank or the air bag PV102 is connected with a micro-pressure sensor pipeline, an air supply electromagnetic valve (also called an air supply breather valve and an air supply valve) DDV01A is arranged on the connecting pipeline, and the electromagnetic valve can be any automatic control valve which can be opened and closed along with control logic; the micro-pressure sensor is used for monitoring the micro-pressure of the oxygen supply hose between the electromagnetic valve (air supply breather valve) and the nasal cavity of the human body.
Based on portable oxygen generation and supply device based on pressure swing adsorption technology as above, its air supply flow is as follows:
(1) opening 01A and 101A air inlet to generate oxygen; at the same time, 02B is open and 101B begins to empty; when the adsorption of 101A is saturated, the next step is carried out;
(2) opening 01B and 101B to generate oxygen; at the same time, 02A is open and 101A begins to empty; when the adsorption of 101B is saturated, the cycle returns to the previous step.
In the above steps, except for the appointed opening of the valve, all the other valves are in a closed state;
the oxygen can be prepared by the circulation reciprocating, and the prepared oxygen is temporarily stored in the buffer tank PV 102;
when a human body inhales, the pressure in the air supply hose changes and is in a descending trend, and the micro-pressure sensor detects the change, so that the air supply solenoid valve DDV01 is controlled to be opened, and the air supply hose is sent to the entrance of the nose to supply oxygen to the human body; when the human body exhales, the micro-pressure sensor also detects the change, further controls the air supply solenoid valve DDV01 to be closed, and stops oxygen supply so as to save oxygen consumption during ineffective breathing;
when the oxygen generating device reaches the designed purity, such as 93 percent of oxygen concentration, in normal operation, as the prior art, the oxygen generating device has a stable output flow Q under the condition of maintaining the oxygen concentration; on the premise that the total output amount is ensured in a unit time, the output oxygen concentration can be maintained as in the prior art; if the total output is increased, the output oxygen concentration will decrease;
when a human body inhales and exhales, the micro-pressure sensor is triggered along with the respiratory frequency; when a human body starts to inhale, the air supply electromagnetic valve DDV01 is opened once after each triggering, and if the opening time is t1, according to the fixed time duration t1, the gas flow corresponding to the time duration is sprayed outwards: t1, it is clear that as the respiration rate increases, t1 determines the increase in total output and the oxygen concentration will trend downward.
In the utility model, the total output quantity is kept unchanged by changing the time length t1 of each opening, the respiratory frequency is continuously monitored, namely the opening times of the gas supply electromagnetic valve DDV01 are monitored, typically, the opening time length of the previous 10 times is taken, so that the oxygen production capacity of the equipment without reduction of the concentration can be ensured, namely, the stable output flow Q is taken as a base number, when the unit average flow calculated by the corresponding time length t1 x 10 of the previous 10 times opening of the gas supply electromagnetic valve DDV01 is greater than the equipment capacity, the flow output each time is controlled by reducing t1, namely reducing the opening time of the gas supply electromagnetic valve DDV01, so that the total output flow is controlled to be unchanged; therefore, the oxygen concentration can be kept unchanged, the phenomena of 'gas cut-off' and 'no supply' are avoided, and the gas supply experience is good; moreover, with the increase of the breathing frequency, although the air supply flow in the unit breathing frequency is less, the total air supply amount still maintains the original air supply flow, so that the blood oxygen saturation can be effectively maintained;
similarly, by monitoring the opening times of the air supply solenoid valve DDV01, when the breathing frequency is reduced, the output total amount is reduced, namely the running frequency of a motor of an air compressor (not shown in the figure) is reduced by the controller, the running load is reduced, the power consumption is reduced, and the service life of the portable oxygen generation and supply device is prolonged;
similarly, by monitoring the opening times of the gas supply electromagnetic valve DDV01, when the respiratory frequency is reduced, the output total amount is reduced, and the controller can open the control valve 03A/03B to use the surplus oxygen in the oxygen buffer tank as the cleaning gas, so as to further improve the oxygen production purity of the equipment and improve the oxygen production efficiency of the system, thereby further reducing the operation power consumption;
according to the aforesaid, so the circulation is reciprocal, can the stable equipment operation condition, maintain equipment oxygen production concentration, and satisfy the required oxygen supply of personnel's life guarantee under the high altitude condition, and can change the oxygen suppliment along with respiratory frequency, avoided appearing "the gas break", "supply the phenomenon that can not come", the air feed is experienced and is felt well, especially along with respiratory frequency's improvement, still can effectual maintenance oxyhemoglobin saturation, the demand of equipment physical characteristic has been reduced, portable air feeder's time of endurance has been improved.
Claims (2)
1. A portable oxygen generation and supply device is characterized by comprising:
(1) at least one compression device for supplying the necessary pressurized feed air, comprising means for air pre-treatment for removing impurity components from the feed gas;
(2) the pressure swing adsorption drying device comprises an adsorption tower, a nitrogen adsorbent, an air inlet valve of the adsorption tower and necessary connecting pipelines thereof, an exhaust valve and necessary connecting pipelines thereof, a gas production valve and necessary connecting pipelines thereof;
(3) at least one oxygen buffer tank or air bag for temporarily storing oxygen, wherein the buffer tank or air bag is communicated with the product end outlet valve of the adsorption tower and is used for receiving the oxygen enriched from the adsorption tower; and at least one loop is arranged for returning the oxygen to the product end of the adsorption tower;
(4) at least one control valve for controlling the quantitative output of oxygen, also called as a gas supply valve, is connected in series behind the oxygen buffer tank and is used for outputting oxygen in a timing and quantitative manner;
(5) at least one micro-pressure sensor connected in series behind the control valve and used for monitoring the pressure of the oxygen delivery hose connected to the nasal cavity of the human body;
(6) the controller is used for controlling the starting and stopping of the power equipment, load adjustment, opening and closing of the valve and operation;
(7) the power supply assembly can be charged and discharged and provides power for the air compression equipment, the controller and the sensor of the system;
(8) and necessary frame, casing, connecting pipeline, equipment chassis, heat dissipating, ventilating, vibration damping and noise reducing facilities, and air supply hose from the air supply valve outlet to the nasal cavity of human body.
2. The portable oxygen supply apparatus as claimed in claim 1, wherein the typical structure comprises: two adsorption towers 101A and 101B, a buffer tank or an air bag PV102 and a micro-pressure sensor; wherein:
the raw material air comes from an air compressor, a raw material gas pipeline is respectively connected with air inlets of two adsorption towers 101A and 101B, an automatic control valve 01A is arranged on a connecting pipeline of the raw material gas pipeline and the air inlet of the adsorption tower 101A, and an automatic control valve 01B is arranged on a connecting pipeline of the raw material gas pipeline and the air inlet of the adsorption tower 101B; meanwhile, the air inlets of the two adsorption towers 101A and 101B are respectively connected with a silencer pipeline, an automatic control valve 02A is arranged on the side of the adsorption tower 101A, an automatic control valve 02B is arranged on the side of the adsorption tower 101B, and the adsorbed waste gas is discharged to the atmosphere from the silencer;
the product ends of the adsorption towers 101A and 101B are connected through a pipeline, an automatic control valve 03A is arranged on the side of the connecting pipeline close to the adsorption tower 101A, an automatic control valve 03B is arranged on the side of the connecting pipeline close to the adsorption tower 101B, and a joint between the control valve 03A and the control valve 03B is connected with an air inlet of a buffer tank or an air bag PV102 through a pipeline;
meanwhile, the product ends of the adsorption towers 101A and 101B are connected through another pipeline, a check valve DXF01A is arranged on the side of the connecting pipeline close to the adsorption tower 101A, a check valve DXF01B is arranged on the side of the connecting pipeline close to the adsorption tower 101B, and the joint between the check valve DXF01A and the check valve DXF01B is connected with an air inlet of a buffer tank or an air bag PV102 through a pipeline;
the air outlet of the buffer tank or the air bag PV102 is connected with a micro-pressure sensor pipeline, and an air supply electromagnetic valve DDV01A is arranged on the connecting pipeline; the micro-pressure sensor is used for monitoring the micro-pressure of the oxygen supply hose from the air supply electromagnetic valve to the nasal cavity of the human body.
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| CN202120449645.9U CN215426720U (en) | 2021-03-03 | 2021-03-03 | Portable oxygen-making and air-supplying device |
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| CN202120449645.9U CN215426720U (en) | 2021-03-03 | 2021-03-03 | Portable oxygen-making and air-supplying device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112807538A (en) * | 2021-03-03 | 2021-05-18 | 中国人民解放军空军军医大学 | Portable oxygen generation and supply device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112807538A (en) * | 2021-03-03 | 2021-05-18 | 中国人民解放军空军军医大学 | Portable oxygen generation and supply device and method |
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