Portable oxygen supply device and method

Abstract

The present invention belongs to the field of gas separation technology, and specifically relates to a portable oxygen production and supply device and method. The oxygen production and supply device of the present invention adopts a pulse gas supply method, which can change the oxygen supply flow rate within a unit breathing frequency as the breathing frequency changes, but still maintains the total oxygen supply per unit time; as the breathing frequency changes, the gas supply volume for each breath will change synchronously, and there will be no "gas cut-off" or "insufficient supply" phenomenon, and the gas supply experience is good; and as the breathing frequency increases, although the gas supply flow rate within the unit breathing frequency is small, because the total gas supply still maintains the original gas supply flow rate, the blood oxygen saturation can be effectively maintained. Moreover, when the air supply breathing frequency decreases, the endurance time is enhanced by changing the operating load of the device. The present invention can be used safely and continuously by a single soldier in various environments.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas separation, and in particular relates to a portable oxygen supply device and method for a single soldier that can change the oxygen supply flow rate according to the breathing frequency of an individual. Background Art

[0002] As the altitude increases, the oxygen content in the atmosphere (absolute value, g / m 3 ) and oxygen partial pressure (pressure value, kPa) decrease accordingly, the oxygen content in the blood (blood oxygen saturation) decreases, and the human body's natural reaction becomes intense, causing human injuries such as increased heart rate, slow reaction, irritability, decreased immunity, etc., accompanied by a series of problems such as headache, abdominal distension, hair loss, dyspnea, lack of energy, poor sleep quality, memory loss and even death from pulmonary edema. Whether it is combat troops rushing to the plateau, cadres and employees of government or industrial departments, travelers, or Tibetans who have lived in the plateau for generations, effective oxygen supply is a very important solution.

[0003] At present, most of the oxygen supply methods for individuals, especially portable individual breathing oxygen supply methods, use fixed-flow oxygen concentrators to directly supply air to the human body through the nose. Because the flow of oxygen production equipment is fixed, in order to meet the oxygen flow required by people at higher altitudes, the equipment's air supply capacity is required to be higher. Affected by this, the design challenges of the size, volume, weight, required power, and endurance of the concentrator are huge; although some products are coupled with the design of pulse breathing in the hope of reducing the amount of oxygen supplied per unit respiratory frequency and reducing the demand for equipment air supply flow, it is essentially still a quantitative output air supply method that follows the respiratory frequency. When the respiratory frequency changes, it is easy to fail to keep up and cause oxygen supply failure. If the air supply follows the respiratory frequency, the oxygen supply purity of the concentrator will decrease due to the increase in the air supply flow per unit time, and the blood oxygen saturation cannot be effectively maintained. Therefore, a more effective air supply method solution is urgently needed. Summary of the invention

[0004] In view of the above situation, the object of the present invention is to provide a single-soldier portable oxygen supply device and method that can change the oxygen supply flow rate according to the individual breathing frequency of the personnel.

[0005] The gas supply method provided by the present invention is a pulse gas supply method, which can supply gas in time with the breathing frequency: the enriched oxygen prepared by the device is delivered to the nose entrance through the gas supply hose, and when the human body inhales, the pressure in the pipeline can cause a certain degree of negative pressure, and the micro-pressure sensor installed at the oxygen-enriched outlet can sense it and open the gas supply valve through the control system, so that gas can be quickly supplied to the human body through the gas supply hose; conversely, when the human body exhales, because the micro-pressure sensor installed at the oxygen-enriched outlet can sense the pressure change, the control system closes the gas supply valve to stop supplying gas to the human body through the gas supply hose, and the prepared enriched oxygen is stored for use, thereby saving the waste of this part of gas.

[0006] The air supply method provided by the present invention can change the oxygen supply flow rate within a unit breathing frequency as the breathing frequency changes, but still maintain the total amount of oxygen supply within a unit time; as the breathing frequency changes, the air supply volume for each breath will change synchronously, and there will be no phenomenon of "gas cut-off" or "insufficient supply", and the air supply experience is good; and as the breathing frequency increases, although the air supply flow rate within a unit breathing frequency is reduced, because the total amount of air supply still maintains the original air supply flow rate, the blood oxygen saturation can be effectively maintained;

[0007] Moreover, since the total amount of oxygen supplied per unit time can be maintained, the working state of the oxygen concentrator will not be changed, and the oxygen concentration index can be kept stable. Furthermore, the oxygen partial pressure is ensured and the blood oxygen saturation is maintained: if a fixed amount of oxygen is delivered each time inhalation, when the respiratory frequency changes to a higher level, the gas flow delivered per unit time will increase, which will exceed the oxygen production capacity of the equipment until the oxygen produced by the oxygen production equipment is exhausted. Not only because the oxygen production process itself exceeds the oxygen production capacity of the oxygen production equipment, the purity will decrease, and in extreme cases, the phenomenon of "gas outage" and "insufficient supply" will occur. However, as the respiratory frequency increases, the present invention will shorten the opening time of the gas supply valve through the control system, that is, reduce the actual gas supply flow rate each time the gas supply valve is opened, but also maintain the average gas supply flow rate per unit time not exceeding the oxygen production capacity of the oxygen production equipment through the control system, so that the purity of the oxygen produced by the oxygen production equipment can be maintained, and the average oxygen supply received by the human body remains unchanged, the blood oxygen saturation can be maintained, and the experience of breathing gas supply is good, which solves the problems of "gas outage" and "insufficient supply".

[0008] In addition, the gas supply method provided by the present invention is combined with the oxygen concentrator oxygen production process adjustment. As mentioned above, when the respiratory rate decreases, the actual gas supply of the gas supply valve will be reduced, and the oxygen produced by the oxygen production equipment will be stored more in the oxygen buffer tank. Obviously, this part of the "surplus" oxygen can be introduced into the cleaning stage to increase the oxygen supply concentration and further maintain a higher oxygen concentration output. This point, for individual portable equipment, can adapt to higher altitude use.

[0009] Furthermore, by adopting the method of the present invention, when the air supply breathing frequency is reduced, the operating load of the oxygen concentrator is changed: the air supply valve is opened by the control system to reduce the actual air supply volume, and the load of the compressor is reduced (such as reducing its frequency) by the control system, thereby reducing power consumption and increasing the battery life. This is of great significance to individual portable equipment.

[0010] The portable oxygen supply device provided by the present invention comprises:

[0011] (1) at least one compression device for providing the necessary raw air under pressure and including the necessary air pretreatment equipment for removing impurities from the raw air;

[0012] (2) at least one set of pressure swing adsorption drying device, which includes an adsorption tower, which contains one or more combinations of nitrogen adsorbents (molecular sieves), as well as an air inlet valve and its necessary connecting pipelines, an exhaust valve and its necessary connecting pipelines, and a gas production valve and its necessary connecting pipelines;

[0013] (3) at least one oxygen buffer tank or air bag for temporarily storing oxygen, the buffer tank or air bag being connected to the product end outlet valve of the adsorption tower to receive oxygen enriched from the adsorption tower; and at least one loop is provided to return the oxygen to the product end of the adsorption tower;

[0014] (4) At least one control valve (also called air supply valve) for controlling the quantitative output of oxygen is connected in series after the aforementioned oxygen buffer tank to output oxygen in a timely and quantitative manner;

[0015] (5) at least one micro-pressure sensor connected in series after the aforementioned control valve, for monitoring the pressure of the oxygen delivery pipeline (a hose) connected to the human nasal cavity;

[0016] (6) At least one controller for controlling the start and stop of the power equipment, load regulation, valve opening and closing, and calculation, etc. This is easy to implement for those skilled in the art;

[0017] (7) At least one power supply component, which can be any type of battery, which can be charged and discharged to provide power for the system's air compression equipment, controllers, sensors, etc.;

[0018] (8) As well as necessary racks, housings, connecting pipes, equipment chassis, heat dissipation and ventilation, vibration and noise reduction facilities, and air supply hoses from the outlet of the air supply solenoid valve to the human nasal cavity.

[0019] The above-mentioned portable oxygen generator also includes a battery, a frame (casing) and its mounting components, connecting pipes between devices, etc.

[0020] Based on the above portable oxygen supply device, the method of supplying gas is as follows:

[0021] The enriched oxygen produced by the device is delivered to the human nose through the air supply hose:

[0022] When a person inhales, a certain degree of negative pressure is formed in the pipeline, and the micro-pressure sensor installed at the oxygen-enriched outlet can sense it and open the air supply valve through the control system, so that air can be quickly supplied to the person through the air supply hose; conversely, when a person exhales, the micro-pressure sensor installed at the oxygen-enriched outlet can sense the pressure change, and close the air supply valve through the control system, stop supplying air to the person through the air supply hose, and store the prepared enriched oxygen for use, saving the waste of this part of gas;

[0023] In general, when the breathing frequency changes to a higher level, the gas flow rate delivered per unit time will increase, which will exceed the oxygen production capacity of the equipment until the oxygen produced by the oxygen production equipment is exhausted. Not only will the purity decrease because the oxygen production process itself exceeds the oxygen production capacity of the oxygen production equipment, but in extreme cases, it will also cause the phenomenon of "gas outage" and "insufficient supply". However, when using the device of the present invention, as the breathing frequency increases, the opening time of the gas supply valve is shortened by the control system, that is, the actual gas supply flow rate is reduced each time the gas supply valve is opened, but the control system is also used to maintain the average gas supply flow rate per unit time not exceeding the oxygen production capacity of the oxygen production equipment, so the purity of the oxygen produced by the oxygen production equipment can be maintained; moreover, the average oxygen supply received by the human body remains unchanged, the blood oxygen saturation is maintained, and the experience of breathing gas supply is good, which solves the problems of "gas outage" and "insufficient supply".

[0024] In addition, when the breathing rate decreases, the actual air supply when the air supply valve is opened will decrease. Similarly, the oxygen produced by the oxygen production capacity equipment will be stored more in the oxygen buffer tank. Combined with the adjustment of the oxygen production process of the oxygen concentrator, this part of the "surplus" oxygen can be introduced into the cleaning stage to increase the oxygen supply concentration and further maintain a higher oxygen concentration output. This point, for individual portable equipment, can adapt to higher altitudes.

[0025] Furthermore, when the air supply breathing frequency is reduced to a lower level, the air supply valve is opened through the control system to reduce the actual air supply volume, and the control system acts on the compressor to reduce its load (such as reducing its frequency) to reduce power consumption and extend the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of oxygen utilization for continuous oxygen supply method.

[0027] Figure 2 It is a diagrammatic representation of the structure and process flow of the portable oxygen production and supply device of the present invention. DETAILED DESCRIPTION

[0028] The portable oxygen production and gas supply device and gas supply method of the present invention are further described below in conjunction with the accompanying drawings and embodiments.

[0029] As attached Figure 1 , is a schematic diagram of oxygen utilization of a continuous oxygen supply method:

[0030] In a normal human inhalation-exhalation cycle, the inhalation time is about 1 / 3, and the exhalation time is about 2 / 3. If a traditional oxygen concentrator uses a continuous oxygen supply method, all the oxygen it produces will be wasted during the exhalation process (about 2 / 3);

[0031] During the inhalation process, due to the existence of respiratory dead space, only the oxygen inhaled in the first 2 / 3 cycle can actually reach the alveoli for oxygen exchange and be effectively used by the body. The oxygen inhaled in the last 1 / 3 cycle can only reach the respiratory tract and cannot actually be effectively used by the body.

[0032] That is to say, in the continuous oxygen supply method, about 4 / 5 of the oxygen is actually wasted in the exhalation process and the respiratory tract, and the oxygen utilization rate is only about 20%;

[0033] In the pulse breathing method of the present invention, the utilization rate of oxygen produced by the oxygen concentrator is close to 100%.

[0034] As attached Figure 2 , is a structure and process flow chart of the portable oxygen production and supply device of the present invention.

[0035] In the attached drawings, 01A, 01B, 02A, 02B, 03A, 03B represent automatic control valves, which can be opened or closed according to a preset logic. Of course, they can also be automatic control valves with flow control and adjustment performance. These valves can be pneumatically controlled, or they can be electric or hydraulically controlled automatic valves;

[0036] DXF01A and DXF01AB represent check valves, which can be any valve that can limit the one-way flow of fluid;

[0037] 101A and 101B are adsorption towers filled with adsorbent and molecular sieve;

[0038] PV102 stands for buffer tank, air bag, a container that can store oxygen;

[0039] DDV01A represents an air supply solenoid valve, which is also the air supply breathing valve referred to in the present invention, and can be any automatic control valve that can follow the control logic switch.

[0040] The meanings of some of the names involved are as follows:

[0041] Product gas refers to the gas that is difficult to be adsorbed by the adsorbent. For example, for nitrogen adsorbent, nitrogen is easier to be adsorbed, while oxygen and argon are difficult to adsorb.

[0042] Waste gas refers to the gas that is easier to be adsorbed by the adsorbent than the product gas, such as nitrogen and water, which are easier to be adsorbed by the nitrogen adsorbent than oxygen;

[0043] Adsorbents, also known as molecular sieves, are used in conventional PSA processes to produce oxygen from air streams. Nitrogen adsorbents such as CaA, CaX, NaX, LiX are generally used to produce oxygen based on the equilibrium adsorption theory.

[0044] Adsorption tower, also known as adsorber, adsorption bed, separator, refers to a container filled with at least one adsorbent such as the above mentioned, which has a strong adsorption capacity for the more easily adsorbed components in the mixed gas;

[0045] Pressure swing adsorption, adsorption separation, PSA and other terms are well known to those skilled in the art and refer not only to the PSA method but also to similar methods, such as vacuum swing adsorption (VSA) or mixed pressure swing adsorption (MPSA) methods, etc. In addition, in a broader sense, the periodic cycle adsorption pressure, a higher pressure is a higher pressure relative to the desorption step, may include greater than or equal to atmospheric pressure; and the periodic cycle desorption pressure, a lower pressure is a lower pressure relative to the adsorption step, includes less than or equal to atmospheric pressure.

[0046] Unless explicitly noted, the pressure mentioned in the present invention is gauge pressure.

[0047] As attached Figure 2 , is a typical portable oxygen supply device structure of the present invention, including: two adsorption towers 101A, 101B, a buffer tank or air bag PV102, a micro-pressure sensor; wherein:

[0048] The raw air comes from an air compressor (not shown in the figure), which is powered by a battery and can also be connected to an external power supply. The control system can change the operating frequency of the compressor motor to provide compressed air with different flow rates and pressures for the subsequent separation system. The raw gas pipeline is connected to the air inlets of the two adsorption towers 101A and 101B respectively, and the connecting pipeline between the raw gas pipeline and the air inlet of the adsorption tower 101A is provided with an automatic control valve 01A, and the connecting pipeline between the raw gas pipeline and the air inlet of the adsorption tower 101B is provided with an automatic control valve 01B; at the same time, the air inlets of the two adsorption towers 101A and 101B are respectively connected to a muffler pipeline, and an automatic control valve 02A is provided on the side of the adsorption tower 101A, and an automatic control valve 02B is provided on the side of the adsorption tower 101B, and the adsorbed exhaust gas is discharged from the muffler to the atmosphere;

[0049] There is a pipeline connecting the product ends of the adsorption towers 101A and 101B, and an automatic control valve 03A is provided on the side of the connecting pipeline close to the adsorption tower 101A, and an automatic control valve 03B is provided on the side of the connecting pipeline close to the adsorption tower 101B, and the connection point between the control valve 03A and the control valve 03B is connected to the air inlet of the buffer tank or the air bag PV102 through a pipeline;

[0050] At the same time, another pipeline is connected between the product ends of the adsorption towers 101A and 101B, and a check valve DXF01A is provided on the side of the connecting pipeline close to the adsorption tower 101A, and a check valve DXF01B is provided on the side of the connecting pipeline close to the adsorption tower 101B, and the connection point between the check valve DXF01A and the check valve DXF01B is connected to the buffer tank or the air bag PV102 air inlet through a pipeline;

[0051] The air outlet of the buffer tank or air bag PV102 is connected to the micro-pressure sensor pipeline, on which an air supply solenoid valve (also known as air supply breathing valve, air supply valve) DDV01A is provided. The solenoid valve can be any automatic control valve that can follow the control logic switch; the micro-pressure sensor is used to monitor the micro-pressure of the oxygen delivery hose from the solenoid valve (air supply breathing valve) to the human nasal cavity.

[0052] Based on the portable oxygen supply device based on pressure swing adsorption technology as described above, the gas supply method is as follows:

[0053] (1) Open 01A, 101A takes in air and produces oxygen; at the same time, open 02B, 101B starts to be emptied; when 101A is saturated with adsorption, proceed to the next step;

[0054] (2) Open 01B, 101B takes in air and produces oxygen; at the same time, open 02A and 101A begins to be emptied; when 101B is saturated with adsorption, the cycle returns to the previous step.

[0055] In the above steps, except for the designated open valve, all other valves are in the closed state;

[0056] In this way, oxygen can be produced by repeating the cycle, and the produced oxygen is temporarily stored in the buffer tank PV102;

[0057] When a person inhales, the pressure in the air supply hose will change and show a downward trend. The micro-pressure sensor will detect this change, thereby controlling the air supply solenoid valve DDV01 to open, and sending oxygen to the nose through the air supply hose to supply oxygen to the person. When a person exhales, the micro-pressure sensor will also detect this change, further controlling the air supply solenoid valve DDV01 to close, and oxygen supply will stop, so as to save oxygen consumption during ineffective breathing.

[0058] During normal operation, the oxygen generator reaches the designed purity, for example, when the oxygen concentration reaches 93%, as in the known art, it has a stable output flow Q that can maintain the oxygen concentration; and, under the premise of ensuring the total output in unit time, as in the known art, the output oxygen concentration can be maintained; if the total output increases, the output oxygen concentration will decrease;

[0059] When the human body inhales and exhales, the micro-pressure sensor is triggered following the breathing frequency; when the human body starts to inhale, the gas supply solenoid valve DDV01 opens once each time it is triggered. Assuming that the opening duration is t1, the gas flow corresponding to the fixed duration t1 will be ejected to the outside: t1*respiratory frequency (times). Obviously, as the breathing frequency increases, t1*respiratory frequency (times) determines the increase in total output, and the oxygen concentration will show a downward trend.

[0060] In the present invention, the total output is maintained unchanged by changing the duration t1 of each opening, and the respiratory frequency is continuously monitored, that is, the number of times the gas supply solenoid valve DDV01 is opened. Typically, for example, the first 10 opening durations are taken, and the oxygen production capacity of the equipment that can ensure that the concentration does not decrease, that is, the stable output flow rate Q is used as the base. When, for example, the unit average flow rate calculated by the corresponding duration t1*10 of the first 10 openings of the gas supply solenoid valve DDV01 is greater than the equipment capacity, by reducing t1, that is, reducing the opening time of the gas supply solenoid valve DDV01, the flow rate of each output is controlled, thereby controlling the total output flow rate unchanged; in this way, the oxygen concentration can be maintained unchanged, avoiding the phenomenon of "gas outage" and "insufficient supply", and the gas supply experience is good; and, as the respiratory frequency increases, although the gas supply flow rate within the unit respiratory frequency is reduced, because the total gas supply amount still maintains the original gas supply flow rate, the blood oxygen saturation can be effectively maintained;

[0061] Similarly, by monitoring the number of times the air supply solenoid valve DDV01 is opened, when the respiratory frequency decreases, the total output decreases, and the controller can be used to reduce the motor operating frequency of the air compressor (not shown in the figure) to reduce its operating load and power consumption, thereby extending the use time of the portable oxygen supply device;

[0062] Similarly, by monitoring the opening times of the gas supply solenoid valve DDV01, when the respiratory frequency decreases, the total output decreases. The controller can also open the control valve 03A / 03B to use the surplus oxygen in the oxygen buffer tank as cleaning gas to further improve the oxygen production purity of the equipment and the oxygen production efficiency of the system, thereby further reducing the operating power consumption.

[0063] As described above, such a cycle is repeated to stabilize the operating conditions of the equipment, maintain the oxygen concentration of the equipment, and meet the oxygen supply required for life support of personnel under high-altitude conditions. The oxygen supply can change with the breathing frequency, avoiding the phenomenon of "gas cut-off" and "insufficient supply". The gas supply experience is good, especially with the increase of breathing frequency, it can still effectively maintain blood oxygen saturation, reduce the requirements of the physical properties of the equipment, and increase the battery life of the portable gas supply equipment.

Claims

1. A portable oxygen supply device, characterized in that: include: An air compressor, two adsorption towers 101A, 101B, a buffer tank or air bag PV102, and a micro-pressure sensor; wherein: The raw air comes from an air compressor, and the raw gas pipeline is connected to the air inlets of the two adsorption towers 101A and 101B respectively, and the connecting pipeline between the raw gas pipeline and the air inlet of the adsorption tower 101A is provided with an automatic control valve 01A, and the connecting pipeline between the raw gas pipeline and the air inlet of the adsorption tower 101B is provided with an automatic control valve 01B; at the same time, the air inlets of the two adsorption towers 101A and 101B are respectively connected to a muffler pipeline, and an automatic control valve 02A is provided on the side of the adsorption tower 101A, and an automatic control valve 02B is provided on the side of the adsorption tower 101B, and the adsorbed exhaust gas is discharged to the atmosphere from the muffler; There is a pipeline connecting the product ends of the adsorption towers 101A and 101B, and an automatic control valve 03A is provided on the side of the connecting pipeline close to the adsorption tower 101A, and an automatic control valve 03B is provided on the side of the connecting pipeline close to the adsorption tower 101B, and the connection point between the control valve 03A and the control valve 03B is connected to the air inlet of the buffer tank or the air bag PV102 through a pipeline; At the same time, another pipeline is connected between the product ends of the adsorption towers 101A and 101B, and a check valve DXF01A is provided on the side of the connecting pipeline close to the adsorption tower 101A, and a check valve DXF01B is provided on the side of the connecting pipeline close to the adsorption tower 101B, and the connection point between the check valve DXF01A and the check valve DXF01B is connected to the air inlet of the buffer tank or the air bag PV102 through a pipeline; The air outlet of the buffer tank or air bag PV102 is connected to the micro-pressure sensor pipeline, on which an air supply solenoid valve DDV01A is provided; the micro-pressure sensor is used to monitor the micro-pressure of the oxygen supply hose between the air supply solenoid valve and the human nasal cavity.

2. The gas supply method based on the portable oxygen supply device according to claim 1, characterized in that: The specific steps are as follows: (1) Open the automatic control valve 01A, and the adsorption tower 101A will take in air and produce oxygen; at the same time, open the automatic control valve 02B, and the adsorption tower 101B will start to be emptied; when the adsorption tower 101A is saturated with adsorption, proceed to the next step; (2) Open the automatic control valve 01B, and the adsorption tower 101B takes in air and produces oxygen; at the same time, open the automatic control valve 02A, and the adsorption tower 101A begins to be emptied; when the adsorption tower 101B is saturated with adsorption, the cycle returns to the previous step; In the above steps, except for the designated open valve, all other valves are in the closed state; In this way, oxygen can be produced by repeating the cycle, and the produced oxygen is temporarily stored in the buffer tank PV102; When a person inhales, the pressure in the air supply hose will change and show a downward trend. The micro-pressure sensor will detect this change, thereby controlling the air supply solenoid valve DDV01 to open, and the air is sent to the nose entrance through the air supply hose to supply oxygen to the human body. When the human body exhales, the micro-pressure sensor will also detect the change, and further control the air supply solenoid valve DDV01 to close and stop the oxygen supply to save the oxygen consumption during invalid breathing; During normal operation, the oxygen supply device reaches the designed purity and has a stable output flow Q that can maintain the oxygen concentration; Moreover, under the premise of ensuring the total output per unit time, the output oxygen concentration can be maintained; if the total output increases, the output oxygen concentration will decrease; When the human body inhales and exhales, the micro-pressure sensor is triggered according to the breathing frequency; when the human body starts to inhale, the gas supply solenoid valve DDV01 is opened once each time it is triggered. Assuming that the opening time is t1, the gas flow corresponding to the time t1 will be ejected externally: t1*respiratory frequency. Obviously, as the respiratory frequency increases, t1*respiratory frequency determines the increase in the total output, and the oxygen concentration will show a downward trend; The total output volume is maintained unchanged by changing the duration t1 of each opening, and by continuously monitoring the respiratory frequency, that is, monitoring the number of times the gas supply solenoid valve DDV01 is opened. When the unit average flow rate calculated by the number of times the gas supply solenoid valve DDV01 is opened corresponding to the duration is greater than the equipment capacity, the flow rate of each output is controlled by reducing t1, that is, reducing the opening time of the gas supply solenoid valve DDV01, so as to control the total output flow rate unchanged; in this way, the oxygen concentration can be maintained unchanged; and, as the respiratory frequency increases, although the gas supply flow rate within the unit respiratory frequency is small, the total gas supply volume still maintains the original gas supply flow rate, so that the blood oxygen saturation can be effectively maintained; In addition, by monitoring the opening times of the air supply solenoid valve DDV01, when the breathing frequency decreases, the total output decreases, and the controller can be used to reduce the operating frequency of the air compressor motor to reduce its operating load and power consumption, thereby extending the use time of the portable oxygen supply device; In addition, by monitoring the opening times of the gas supply solenoid valve DDV01, when the respiratory rate decreases, the total output decreases. The controller can also open the control valve 03A / 03B to use the surplus oxygen in the oxygen buffer tank as cleaning gas to further improve the oxygen production purity of the equipment and the oxygen production efficiency of the system, thereby further reducing the operating power consumption. By repeating the above cycle, the operating conditions of the equipment can be stabilized, the oxygen concentration produced by the equipment can be maintained, and the oxygen supply required for life support of personnel under high-altitude conditions can be met. The oxygen supply can also change with the breathing frequency.

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