A low-power blood oxygen saturation value-following oxygen generator

Abstract

The present invention relates to the field of oxygen production technology, and in particular to a low-power blood oxygen saturation value-following oxygen production device and method thereof. The device comprises a control system for receiving a signal value and generating a control signal; a pressure generating component for pressurizing air; an adsorption component loaded with an adsorbent to generate the oxygen required by the user through the pressure swing adsorption principle; an oxygen supply pipeline for outputting the oxygen generated by the adsorption component to an oxygen user; a pipeline diameter adjustment component disposed in the oxygen supply pipeline to adjust the effective diameter L of the oxygen supply pipeline; and a blood oxygen detection component for detecting the user's blood oxygen saturation value in real time, determining a target gear according to the blood oxygen saturation value, and instantly adjusting the duty cycle P of the pressure generating component and the effective diameter L of the oxygen supply pipeline, thereby minimizing power consumption while meeting the user's oxygen demand.

Description

Technical Field

[0001] The present invention relates to the technical field of oxygen production, and in particular to a low-power blood oxygen saturation value following oxygen production device and method thereof. Background Art

[0002] With people's continued pursuit of health, oxygen therapy has gradually entered the public eye, and oxygen concentrators, such as oxygen concentrators and health care machines, have increasingly entered households. Initially, oxygen concentrators were large, rarely moved, and typically operated on mains electricity. However, as usage scenarios have diversified, higher requirements have been placed on the adaptability of oxygen concentrators to various environments, and portability is a key area of ​​improvement for these devices.

[0003] For small portable oxygen concentrators, people are no longer restricted by the fact that they cannot be moved. When they need to go out, users can take the small portable oxygen concentrator with them at any time. When they are out, users can still carry out ideal oxygen therapy. This makes small portable oxygen concentrators have more and more market demands. Because when going out, small portable oxygen concentrators are powered by batteries, so the battery life directly affects the user experience. If you want to supply power for a longer time, the battery is usually larger, which makes it difficult for users to carry it with them for portability.

[0004] Therefore, in order to reduce the weight of the battery as much as possible, the problem of how to reduce the power consumption of the small oxygen concentrator to obtain a longer carrying time becomes particularly prominent, and is also an aspect that urgently needs to be improved and enhanced in the existing small portable oxygen concentrator technology. Summary of the Invention

[0005] In view of the above shortcomings of the prior art, the present invention provides a low-power blood oxygen saturation value following oxygen production device and method thereof. The present invention collects the user's blood oxygen saturation value H in real time. q By adjusting the duty cycle P of the pressure generating component and the effective diameter L of the oxygen supply pipeline accordingly, it can operate with the lowest possible power consumption while meeting the needs of users. On the basis of the original battery, it can extend the time it can be used outdoors as much as possible while ensuring it is small and portable.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] In one aspect, the present invention provides a low-power blood oxygen saturation value-following oxygen production device, comprising:

[0008] A control system for receiving the signal value and generating a control signal;

[0009] a pressure generating component for converting air into pressurized air in response to the control signal;

[0010] The adsorption component is loaded with adsorbents with different nitrogen adsorption capacities at different pressures and generates oxygen required by the oxygen-using object through the pressure swing adsorption principle of pressurized air;

[0011] An oxygen delivery pipeline, used to deliver the oxygen generated by the adsorption component to an oxygen user;

[0012] A pipeline diameter adjustment component is provided in the oxygen delivery pipeline and adjusts the effective diameter L of the oxygen delivery pipeline in response to a control signal of the control system;

[0013] A blood oxygen detection component is used to detect the user's blood oxygen saturation value and send the detected blood oxygen saturation value to the control system;

[0014] The control system receives the blood oxygen saturation value H in real time. q The pressure generating assembly is compared with a preset qualified value H0 of the blood oxygen saturation, and the adjustment amount of the gear position of the oxygen generator is determined according to the comparison result. The control system determines a target gear position according to the adjustment amount, and adjusts the duty cycle P of the pressure generating assembly and the effective diameter L of the oxygen supply pipeline according to the target gear position to achieve tracking of the oxygen supply capacity and the user's blood oxygen saturation.

[0015] Furthermore, the control system receives the blood oxygen saturation value H in real time. q The specific process of comparing the received blood oxygen saturation value H0 with the preset qualified value of blood oxygen saturation is that the control system regularly compares the received blood oxygen saturation value H0 with the preset qualified value of blood oxygen saturation H0 according to the preset time interval. q Compare it with the preset qualified value H0 of blood oxygen saturation.

[0016] Furthermore, the control system receives the blood oxygen saturation value H in real time. q The specific steps of comparing the preset qualified value H0 of the blood oxygen saturation and determining the adjustment amount of the gear position of the oxygen generator according to the comparison result are as follows:

[0017] When the real-time blood oxygen saturation value H q When the value is greater than the preset blood oxygen saturation qualified value H0 and exceeds the first preset range, the adjustment amount should be negative;

[0018] When the real-time blood oxygen saturation value H q When the value is less than the preset blood oxygen saturation qualified value H0 and exceeds the first preset range, the adjustment amount should be positive;

[0019] According to the real-time received blood oxygen saturation value H q The absolute value of the difference between the preset blood oxygen saturation qualified value H0 corresponds to the preset absolute value of the corresponding adjustment amount.

[0020] On the other hand, the present invention also provides a low-power blood oxygen saturation value following oxygen production method, which is used for an oxygen production device including a control system, a pressure generating component, an adsorption component, an oxygen supply pipeline, a pipeline diameter adjustment component, and a blood oxygen detection component. The pipeline diameter adjustment component is used to adjust the effective diameter L of the oxygen supply pipeline. The control system is communicatively connected with the pressure generating component, the adsorption component, the pipeline diameter adjustment component, and the blood oxygen detection component. The specific steps are:

[0021] Receive the blood oxygen saturation value H q The pressure generating device is compared with a preset qualified value H0 of blood oxygen saturation, and the adjustment amount of the gear position of the oxygen generator is determined based on the comparison result. The control system determines a target gear position based on the adjustment amount, and adjusts the duty cycle P of the pressure generating component and the effective diameter L of the oxygen supply pipeline according to the target gear position to achieve tracking of the oxygen supply capacity and the user's blood oxygen saturation value.

[0022] Furthermore, the control system receives the blood oxygen saturation value H in real time. q The specific steps of comparing the preset qualified value H0 of the blood oxygen saturation and determining the adjustment amount of the gear position of the oxygen generator according to the comparison result are as follows:

[0023] When the real-time blood oxygen saturation value H q When the value is greater than the preset blood oxygen saturation qualified value H0 and exceeds the first preset range, the adjustment amount should be negative;

[0024] When the real-time blood oxygen saturation value H q When the value is less than the preset blood oxygen saturation qualified value H0 and exceeds the first preset range, the adjustment amount should be positive;

[0025] According to the real-time received blood oxygen saturation value H q The absolute value of the difference between the preset blood oxygen saturation qualified value H0 corresponds to the preset absolute value of the corresponding adjustment amount.

[0026] The present invention has the following beneficial effects: The present invention detects the user's blood oxygen saturation value H in real time q And send it to the control system, the control system will detect the data H q The adjustment amount of the oxygen generator gear is determined by comparison with the preset qualified value H0, and then adjusted to the target gear. The target gear corresponds to the preset duty cycle P of the pressure generating component and the effective diameter value L of the oxygen supply pipeline. By adding the effective diameter L adjustment, a lower duty cycle P can be achieved in the adjustment of the target gear, thereby achieving the lowest possible oxygen power consumption. That is, when the target gear is determined, the effective diameter L and the duty cycle P are adjusted at the same time to achieve the goal of minimum power consumption.

[0027] The present invention can achieve that the oxygen production capacity of the oxygen concentrator changes with the blood oxygen saturation value. When the blood oxygen concentration is low, the performance of the oxygen concentrator is improved. When the blood oxygen concentration is high, that is, when the user's demand for oxygen is not so high, the oxygen supply capacity of the oxygen concentrator is timely reduced, so that the oxygen concentrator operates with lower power consumption, making the oxygen production process of the oxygen concentrator a dynamic process. Compared with the situation where a constant amount of oxygen is continuously output to the oxygen-using object, this greatly improves the effectiveness of oxygen supply, reduces unnecessary waste, and enables the system to achieve the lowest possible power consumption operation. When the small oxygen concentrator is carried outside and uses batteries, the power consumption of the mobile power supply can be effectively reduced, and the battery oxygen supply time can be greatly extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A diagram showing the relationship between the components of the low-power blood oxygen following oxygen generator according to an embodiment of the present invention;

[0029] Figures 2A-2C This is a relationship diagram of the oxygen concentration ρ, the duty cycle P of the pressure generating component, and the effective diameter L of the oxygen delivery pipeline in the embodiment provided by the present invention;

[0030] Figure 3A A schematic cross-sectional view of a standardized throttling element according to an embodiment of the present invention;

[0031] Figure 3B A schematic longitudinal section diagram of a standardized throttling member according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of a standard pipeline diameter adjustment component according to an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of a pipeline diameter adjustment assembly according to another embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of a pipeline diameter adjustment component according to another embodiment of the present invention. Figure 6 A schematic diagram of a pipeline diameter adjustment component in a specific application scenario provided by the present invention;

[0035] Figure 7 This is a schematic diagram of the working principle of a low-power blood oxygen following oxygen generator in one embodiment of the present invention;

[0036] Figure 8 A schematic flow chart of the working principle of a low-power blood oxygen following oxygen generator in another embodiment of the present invention;

[0037] Figure 9 This is a schematic flow chart of the working principle of a low-power blood oxygen following oxygen generator in another embodiment provided by the present invention.

[0038] In the figure, 1, standardized throttling device 2, hollow cylinder 3, solenoid valve 4, branch 5, electronically controlled flow valve 100, blood oxygen detection component 200, control system 300, pressure generating component 400, adsorption component 500, oxygen supply pipeline 600, pipeline diameter adjustment component. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the accompanying drawings.

[0040] Example:

[0041] When people use oxygen concentrators outdoors, they often can only rely on the car power supply or the stored power of the oxygen concentrator battery. At this time, the power is limited and easily exhausted, which causes inconvenience to the user. Therefore, the use time can be extended as much as possible by reducing the power consumption of the oxygen concentrator. Especially for miniaturized oxygen concentrators, users care very much about their miniaturized portability and can carry them out at any time according to their needs. However, if they go out, they have higher requirements for the duration of power usage. If this is achieved only by increasing the battery power, the portability of the miniaturized oxygen concentrator will be weakened, which goes against the user's original usage needs. Therefore, how to enable users to experience the good performance of the miniaturization and portability of the oxygen concentrator while being able to use it for a longer time directly determines the market competitiveness of the oxygen concentrator.

[0042] The present invention provides a low-power blood oxygen saturation value-following oxygen generation device and method thereof. The device determines the target gear according to the blood oxygen saturation value and instantly adjusts the duty cycle P of the pressure generating component and the effective diameter L of the oxygen supply pipeline. This device can greatly reduce power consumption while meeting the user's oxygen demand.

[0043] A low-power blood oxygen saturation value following oxygen generator, such as Figure 1 As shown, it includes a blood oxygen detection component 100 for detecting the user's real-time blood oxygen saturation value H q , and the detected blood oxygen saturation value H q The data is sent to the control system 200. The blood oxygen detection component 100 and the control system 200 are connected in communication, which can be through a wired or wireless method, such as a Bluetooth connection. The blood oxygen detection component 100 can be a finger-clip oximeter.

[0044] The system further includes a control system 200 for receiving the signal value sent by the blood oxygen detection component 100 and generating a control signal according to a preset program. The control circuit 200 may be a control circuit composed of a single-chip minimum system; and a pressure generating component 300 for converting air into pressurized air in response to the control signal. The pressure generating component 300 may be an oil-free air compressor or a piston compressor using a crank connecting rod. Therefore, the pressure generating component 300 is a major power consumption point of the oxygen generator. By reducing the duty cycle P of the pressure generating component 300, power consumption can be reduced. Of course, the pressure generating component 300 may also be other types of compressors, such as a scroll compressor.

[0045] It also includes an adsorption component 400, which is loaded with adsorbents with different nitrogen adsorption capacities under different air pressures and uses the pressure swing adsorption principle to generate the oxygen required by the oxygen-using object from the pressurized air. The adsorbent can be a zeolite molecular sieve, which adsorbs nitrogen in the air when pressurized to a certain pressure, and the unabsorbed oxygen is collected and desorbed at normal pressure.

[0046] The low-power blood oxygen saturation value tracking oxygen production device also includes an oxygen supply pipeline 500, which can be connected between the adsorption component 400 and the oxygen user, and is used to output the oxygen generated by the adsorption component 400 to the oxygen user; the oxygen supply pipeline 500 is also provided with a pipeline diameter adjustment component 600, which can adjust the effective diameter L of the oxygen supply pipeline 500 in response to the control signal of the control system 200. The effective diameter L refers to the actual fluid passing capacity of the oxygen supply pipeline 500, and specifically, it can also refer to the actual cross-sectional area of ​​the pipeline through which the fluid flows when passing through a certain pipeline. Generally, in order to reduce unpredictability, during normal oxygen production and delivery operations, the oxygen supply pipeline 500 used in the present invention is a pipeline with a fixed cross-sectional area at all positions (except for the pipeline diameter adjustment component 600).

[0047] like Figure 7 As shown, the low-power blood oxygen saturation value follows the working process of the oxygen generator, and the blood oxygen detection component 100 collects the user's blood oxygen saturation value H in real time. q The blood oxygen saturation refers to the percentage of oxygenated hemoglobin in the blood that is bound to oxygen as a percentage of the total hemoglobin capacity that can be bound. It is an important indicator of the body's oxygen status. Generally, if the blood oxygen saturation is lower than 94%, it indicates that the body may be hypoxic. The control system 200 receives the real-time blood oxygen saturation value H q The control system 200 compares the preset qualified value H0 of the blood oxygen saturation with the qualified value H0 in a specific embodiment. In a specific embodiment, the qualified value H0 can be 94%. After the comparison is completed, the control system 200 determines the adjustment amount of the gear position of the oxygen generator according to the comparison result. The adjustment amount determined according to the comparison result is preset in the system program, and the target gear position is calculated and determined based on the adjustment amount.

[0048] Determining the amount to be adjusted involves using real-time oxygen saturation to determine how close the oxygen saturation is to the acceptable level, and thus determining the appropriate adjustment range for the oxygen concentrator's oxygen supply capacity. For example, if the oxygen saturation is significantly lower than the acceptable level, the adjustment level should be increased. If the difference between the oxygen saturation level and the acceptable level is less than a certain threshold, the adjustment level should be set to 0, meaning no adjustment is required.

[0049] Finally, the duty cycle P of the pressure generating component 300 and the effective diameter L of the oxygen supply pipeline 500 are adjusted according to the target gear, so as to achieve the tracking of the oxygen supply capacity and the user's blood oxygen saturation value while ensuring that the output oxygen meets the qualified concentration requirements. Because, if only the duty cycle P of the pressure generating component 300 is adjusted, although the amount of oxygen output can be adjusted, the qualified oxygen concentration cannot be guaranteed during the adjustment process, which affects the normal use of the user. Therefore, in order to ensure the normal oxygen concentration of the user, by adjusting the duty cycle P and the effective diameter L of the oxygen supply pipeline 500 together, it can be successfully achieved that the power consumption is as small as possible while the oxygen concentration can be maintained normal.

[0050] The present invention can achieve that the oxygen production capacity of the oxygen concentrator changes in accordance with the blood oxygen saturation value. When the blood oxygen concentration is low, the power consumption (or oxygen supply capacity) of the oxygen concentrator is increased. When the blood oxygen concentration is high, that is, when the user's demand for oxygen is not so high, the oxygen supply capacity of the oxygen concentrator is timely reduced, so that the oxygen concentrator operates with lower power consumption, making the oxygen production process of the oxygen concentrator a dynamic process. Compared with the situation where oxygen is continuously supplied to the oxygen user at a constant amount, this greatly improves the effectiveness of oxygen supply, reduces unnecessary waste, and enables the system to operate with the lowest possible power consumption. When the oxygen concentrator uses a mobile power supply, the advantage of low power consumption is more prominent, which can effectively reduce the power consumption of the mobile power supply and greatly extend the oxygen supply time using the mobile power supply. This achieves the goal of extending the user's oxygen use time as much as possible without increasing the size of the battery (i.e., ensuring good portability).

[0051] The control system 200 receives the blood oxygen saturation value H in real time. q The specific process of comparing the preset qualified value H0 of blood oxygen saturation is that the control system 200 regularly compares the real-time received blood oxygen saturation value H0 with the preset time interval. qThe oxygen saturation is compared with the preset qualified value H0. The regular interval can be preset in the program of the control system 200 before leaving the factory. In one embodiment, the interval can be every 5 seconds. Because the human body state can change due to changes in health status, the surrounding environment, or changes in mentality, the interval between each comparison should not be too long to ensure that oxygen supply is adjusted according to the user's physical condition.

[0052] The control system 200 receives the blood oxygen saturation value H in real time. q The specific steps of comparing the preset qualified value H0 of the blood oxygen saturation and determining the adjustment amount of the gear position of the oxygen generator according to the comparison result are as follows:

[0053] When the real-time blood oxygen saturation value H q When the value is greater than the preset blood oxygen saturation qualified value H0 and exceeds the first preset range, the adjustment amount should be negative;

[0054] When the real-time blood oxygen saturation value H q When the value is less than the preset blood oxygen saturation qualified value H0 and exceeds the first preset range, the adjustment amount should be positive.

[0055] According to the real-time received blood oxygen saturation value H q The absolute value of the difference between the preset qualified value H0 of the blood oxygen saturation corresponds to the preset absolute value of the corresponding adjustment amount;

[0056] That is, when the real-time received blood oxygen saturation value H q When the blood oxygen saturation is greater than the preset qualified value H0 and exceeds the first preset range, the adjustment amount should be negative and the gear should be reduced.

[0057] According to the real-time blood oxygen saturation value H q The absolute value of the difference between the measured blood oxygen saturation value H0 and the preset blood oxygen saturation qualified value H0, the preset corresponding adjustment amount, refers to, when the measured blood oxygen saturation value H q The closer the distance (whether greater than or less than) to the target value (preset blood oxygen saturation qualified value) H0, the smaller the absolute value of the adjustment amount (whether increased or decreased) should be, so as to achieve the ultimate goal, that is, the blood oxygen saturation value is qualified and closest to the target value.

[0058] This adjustment process can be to change the real-time blood oxygen saturation value H q The absolute value of the difference compared with the preset blood oxygen saturation qualified value H0 is divided into several intervals, that is, different levels, and different adjustment amounts correspond to different intervals; at the same time, the positive or negative value of the difference corresponds to the positive or negative value of the absolute adjustment amount, that is, whether to increase several levels (when negative) or decrease several levels (when positive).

[0059] There are many ways to calculate. In a specific embodiment, the selected oxygen concentrator has a total of 6 gears, and different gears correspond to different oxygen delivery capacities, that is, different oxygen flow rates with qualified concentrations supplied to oxygen-using objects.

[0060] The specific calculation method is: in this 6-speed oxygen concentrator, take the real-time blood oxygen saturation value H q The percentage of the difference between the preset blood oxygen saturation qualified value H0 is ΔH% = (H q -H0) / H0, and use the absolute value of the difference percentage ΔH to define the amount of adjustment that the gear should have. Either the difference percentage or the difference directly can be used as a reference standard for standard adjustment. In this embodiment, the percentage is used to make the result more conducive to observation.

[0061] In a specific embodiment, the rules may be as follows:

[0062] Where, ΔH%=(H q -H0) / H0;

[0063] Table 1. Correspondence between the difference percentage ΔH and the gear position to be adjusted

[0064]

[0065] The amount to be adjusted is the value of the gear that should be increased or decreased after preliminary calculation, but it may be different from the actual value of the gear that should be increased or decreased. q When the gap between the blood oxygen level and the qualified blood oxygen level H0 is -3.6%, it is necessary to add 4 gears on the basis of the existing gears. If the control system recognizes that the original gear is 4, it will calculate that the gear needs to be increased by 4 gears. After the increase of 4 gears, it has exceeded the highest gear 6 of the oxygen concentrator. Then the control system will use 6 gear as the highest gear and will not continue to increase it. It will maintain the preset time T after the adjustment.

[0066] In order to make the system more stable during adjustment, a first preset range is set. In the above table of this specific embodiment, the value of |ΔH| is between [0, 0.5]. If it is within this range, the system recognizes that the gear should be adjusted to 0.

[0067] In a specific embodiment, the preset time T may be 10 seconds, and then the control system 200 continues to calculate the blood oxygen saturation value H according to the new real-time received blood oxygen saturation value H. q , continue to perform real-time blood oxygen saturation value H q Compare the blood oxygen saturation with the preset qualified value H0 and repeat the above adjustment process;

[0068] If the gear adjustment is performed a preset number of times, which can be set to 10 times in one embodiment, and the qualified blood oxygen saturation value H0 is not reached each time, it means that the patient's condition cannot be improved by simple oxygen supply and may be worsening. In this case, the control system 200 can control the alarm module of the oxygen concentrator to issue an alarm, indicating that the user may need other treatment interventions.

[0069] Likewise, when the control system 200 compares the real-time blood oxygen saturation value H q The difference percentage ΔH% from the preset acceptable blood oxygen saturation value H0 is 2.4%. Based on the required adjustment amount, the oxygen concentrator needs to be reduced by three gears. Since the current gear is 2, the minimum gear reduction is 1, and no further reduction is required to ensure a continuous supply of oxygen to the user. In summary, in actual use, increasing or decreasing gears is not only limited by the required adjustment amount, but also by the maximum or minimum gear provided by the oxygen concentrator itself.

[0070] Adjusting the gear position of the oxygen concentrator described herein refers to changing the oxygen flow rate delivered to the user. The relationship between flow rate and gear position can be set before shipment. In a specific embodiment, each target gear position corresponds to a flow rate range. For example, a flow rate between 1L / min and 2L / min can be set to gear 1, and so on. A flow rate between 2L / min and less than 3L / min can be set to gear 2.

[0071] Reducing the duty cycle P of the pressure generating assembly 300 can reduce power consumption. Generally, when adjusting the gear, the adjustment of the duty cycle P of the compressor is a major adjustment factor, and the change of the duty cycle P directly affects the power consumption of the entire oxygen production device.

[0072] For oxygen production equipment, the oxygen concentration output to the oxygen-using object usually needs to reach the qualified oxygen concentration value, especially medical oxygen production equipment, which needs to meet the 93% oxygen concentration specified in YY 1468-2016 "Oxygen Concentrator Supply System for Medical Gas Pipeline Systems". That is, an output oxygen concentration of more than 93% is considered qualified.

[0073] However, when the duty cycle P is changed by adjusting the gear position, if the duty cycle P is too low, the concentration may be unacceptable. When other parameters are not changed, the relationship between the oxygen concentration value ρ of the oxygen output by the oxygen generator to the oxygen user, the duty cycle P of the pressure generating assembly 300, and the effective diameter L of the oxygen supply pipeline 500 is obtained through experiments as follows: Figures 2A to 2C data.

[0074] Among them, such as Figure 2AAs shown, when the effective diameter L of the fixed oxygen supply pipeline 500 is L4 and remains unchanged, and the duty cycle P of the pressure generating component 300 is changed and gradually decreased from P4 to P1, the detected oxygen concentration value ρ of the output oxygen gradually becomes smaller from above the qualified line and finally drops below the qualified line. This is because when the duty cycle P of the pressure generating component 300 is reduced to a certain extent, the air pressure entering the adsorption component 400 also decreases, which in turn leads to a decrease in the adsorption capacity of the zeolite molecular sieve for nitrogen, resulting in unqualified output oxygen concentration.

[0075] As Figure 2B shown, for the same oxygen generation device, when the duty cycle P is maintained at P2 unchanged and the effective diameter L is changed, it will also affect the output oxygen concentration ρ. As the effective diameter L gradually decreases from L4 to L1, the oxygen concentration ρ increases. This is because reducing the effective diameter L of the oxygen supply pipeline 500 increases the resistance on the side where the adsorption component 400 discharges oxygen, which is beneficial to making the pressure in the adsorption component 400 tend to increase relatively, so the generated oxygen concentration is also higher.

[0076] Therefore, while reducing the power consumption by reducing the duty cycle P of the pressure generating component 300, reducing the effective diameter L of the oxygen supply pipeline 500 can improve the situation of unqualified output oxygen concentration, so as to achieve oxygen supply with as low power consumption as possible under the condition of qualified oxygen concentration. Therefore, if only reducing the duty cycle P to reduce the power consumption, due to the oxygen concentration situation, it is impossible to reach a lower duty cycle P. That is, to ensure that users always have qualified oxygen to use, the adjustment range of only adjusting the duty cycle P is limited. However, when the adjustment of the effective diameter L is added, when the oxygen concentration becomes unqualified due to reducing the duty cycle P to a certain value, changing the effective diameter L can make the oxygen concentration become qualified again from unqualified, and the duty cycle P can be allowed to continue to decrease, so a lower power consumption can be achieved.

[0077] Again, in another two groups of comparative experiments, as Figure 2A 、 2C shown, when the effective diameter L is L2 and remains unchanged and only the value of the duty cycle P is changed ( Figure 2C ), and when the effective diameter L is L4 (L2 < L4) and the value of the duty cycle P is also changed ( Figure 2A ), in these two groups of experiments, the oxygen concentration ρ corresponding to the same duty cycle P is not the same. It can be seen that when the effective diameter L is reduced, under the same duty cycle P, the oxygen concentration can be increased.

[0078] In summary, it can be concluded that when the gear size of the oxygen generator (i.e., the output oxygen flow rate) is changed by adjusting the duty cycle P, and the effective diameter L of the oxygen supply pipeline 500 is simultaneously adjusted, it is possible to supply oxygen to the oxygen user with the smallest possible power consumption (i.e., the compressor duty cycle P) while providing oxygen of a qualified concentration value.

[0079] Depend on Figure 2A and Figure 2C It can be seen that when the duty cycle P is fixed, the oxygen concentration can be changed by adjusting the effective path L. Therefore, under the condition that the oxygen output concentration is always qualified, the lowest duty cycle P can be found by adjusting the effective path L (for example, reducing the effective path L).

[0080] Because the gear position corresponds to the flow rate, if the effective diameter L is fixed and only the duty cycle P is adjusted, the gear position can be changed. However, when the duty cycle P is reduced to a certain value P', corresponding to the N gear (N is a natural number greater than 0), the concentration may begin to be unqualified. At this time, there is no way to achieve the N-1 gear by reducing the duty cycle P (of course, the N gear corresponds to a certain flow value, which is pre-set artificially. For the sake of convenience, the gear position is used instead of the flow rate to describe it).

[0081] However, if the effective path L continues to decrease to L' after reaching duty cycle P', the oxygen concentration may once again meet the required standards. Duty cycle P can then be further reduced from P', further reducing the oxygen concentrator's power consumption. Setting the gear allows the oxygen concentrator to operate at a lower oxygen supply capacity. This means that when the oxygen user's oxygen demand decreases to a certain level, the oxygen concentrator can provide a qualified oxygen output at the lowest possible power consumption. Therefore, by combining blood oxygen saturation detection with operation at extremely low power consumption when the user's oxygen demand is detected to be extremely low, the oxygen concentrator can significantly extend battery life.

[0082] Therefore, in view of the influence of the effective path L on the duty cycle P setting under the premise of qualified concentration, an effective path L can be determined for each gear through multiple experiments and preset in the program, that is, when switching between gears, not only the duty cycle P is switched but also the effective path L. In order to further facilitate adjustment and good controllability of parameters, because the flow rate corresponding to the gear is an interval, each target gear corresponds to an effective path L value and an interval of the duty cycle P value of the pressure generating component 300, that is, by adjusting the duty cycle P of the pressure generating component 300 under this specific effective path L, the flow rate of the gear can be fine-tuned.

[0083] In other words, in an oxygen concentrator, the power consumption of the pressure generating assembly 300 is the primary factor in the overall system's electricity consumption. Reducing the duty cycle P of the pressure generating assembly 300 effectively controls power consumption. However, while the power consumption of the pressure generating assembly 300 is being adjusted downward based on external conditions, insufficient pressurized air pressure provided by the pressure generating assembly 300 to the adsorption assembly 400 (which can be a molecular sieve cartridge) can cause the pressure within the molecular sieve cartridge to continue to decrease. While this reduces power consumption, the output oxygen concentration no longer meets the specified value, impacting user experience.

[0084] If one wants to operate with lower power consumption, it is impossible and the only option is to increase the duty cycle P of the pressure generating assembly 300. By reducing the effective diameter L of the oxygen supply pipeline 500, the problem of low oxygen concentration caused by insufficient pressure in the molecular sieve cartridge due to the reduction in the duty cycle P of the pressure generating assembly 300 can be compensated. This effectively solves the adverse consequences caused by the lower duty cycle P of the pressure generating assembly 300 without increasing the duty cycle P of the pressure generating assembly 300, thereby ensuring that the oxygen production device operates with lower power consumption.

[0085] Because the target gear is in the form of an interval, it is possible to find the lowest power consumption state suitable for the user within the interval while ensuring the user's usage needs, that is, the lowest power consumption when the oxygen supply output matches the oxygen required by the user's blood oxygen saturation value.

[0086] By adjusting the duty cycle P of the pressure generating assembly 300 in different ways in combination with the positive and negative values ​​of the gear adjustment amount, it is possible to better combine the actual conditions of the oxygen user.

[0087] In the parameter adjustment at each gear, in order to provide the user with output oxygen corresponding to his blood oxygen saturation value as much as possible, while taking into account the lowest power consumption of the entire oxygen generator, the specific adjustment process is as follows: Figure 8 As shown, it can be:

[0088] If the amount to be adjusted is positive, the duty cycle P of the pressure generating component takes the highest value within the preset duty cycle P range corresponding to the target gear and is maintained for a preset time T'. The time T' here is not the same as the above-mentioned time T; in a specific embodiment, the preset time T' can be 20s, because the increase in blood oxygen concentration takes time and will not be an instantaneous change value. In order to provide the user with a stable blood oxygen concentration increase, it is necessary to maintain the time T' first.

[0089] If the blood oxygen saturation value H is detected within time T' qThe difference between the preset blood oxygen saturation qualified value H0 is always within the second preset range (the second preset range can be the same as or different from the first preset range). Here we choose the first preset range to be the same as the second preset range, both of which make the value of |△H| between [0, 0.5﹚]. Then, starting from the highest value in the preset duty cycle P interval, the value decreases until the oxygen concentration fails to meet the requirements, or reaches the lowest value in the preset duty cycle P interval, or the blood oxygen saturation value H q When the qualified value H0 of the blood oxygen saturation exceeds the preset range, the lowest power consumption point is found. The lowest power consumption is the lowest value of the duty cycle P when other conditions are met.

[0090] In this process, if the oxygen concentration is unqualified, the duty cycle P is reversed to the qualified oxygen concentration line and the increase of the duty cycle P is stopped; the range of the effective diameter L and the duty cycle P corresponding to the preset gear can be obtained through a large amount of experimental data, which can ensure that within this range of diameter L and duty cycle P, the general blood oxygen saturation value is adjusted to its required value. However, due to the different environments in which the oxygen concentrator is located, such as different altitudes, or environments with different air pressures, or the different service lives of the molecular sieves in the oxygen concentrator, the external environment may cause the same duty cycle P and When the effective path L is adjusted, the oxygen concentration will be different. The lower the oxygen concentration, the lower the power consumption of the oxygen concentrator. Therefore, it is necessary to find the position where the oxygen concentration is close to the unqualified oxygen concentration but can maintain the qualified oxygen concentration within a range that can meet the user's blood oxygen saturation value adjustment, that is, the lowest duty cycle P value. In this way, the lowest power consumption of the oxygen concentrator can be further found. Especially for portable oxygen concentrators, which are often carried out by users, being able to maintain the lowest power consumption means that they can be used for a longer time, which will be a particularly prominent advantage of portable oxygen concentrators.

[0091] Starting from the highest value in the duty cycle P interval of the pressure generating component 300, the search for the lowest power consumption suitable for the user can ensure that a larger oxygen flow rate is provided first to alleviate the problem of low blood oxygen saturation of the oxygen user. Finally, whether the oxygen concentration is qualified or the lowest value in the duty cycle P interval is used as the critical point. At this time, the corresponding duty cycle P of the pressure generating component 300 is the lowest power consumption suitable for the user.

[0092] If the oxygen concentration continues to be unsatisfactory, the control system 200 will issue an alarm signal. This is because based on the effective path L value corresponding to each gear and the duty cycle P value range of the pressure generating assembly 300, if the oxygen production capacity is still unable to make the oxygen concentration meet the preset conditions, there may be a problem with other components inside the machine, such as the molecular sieve has been used for too long. In this case, an alarm is issued, and the oxygen user can check whether other components in the oxygen generator are operating normally.

[0093] like Figure 9 As shown, if the blood oxygen saturation value H is detected within time T' q The difference between the value of |ΔH| and the preset qualified value H0 of the blood oxygen saturation exceeds the second preset range. In a specific embodiment, the second preset range can be the same as the first preset range. When the value of |ΔH| is not between [0, 0.5﹚, the blood oxygen saturation value H0 detected is re-calculated. q The difference between the preset blood oxygen saturation qualified value H0 determines the amount to be adjusted and enters a new adjustment cycle. The new adjustment cycle is to continue to determine the target gear according to the amount to be adjusted and continuously monitor whether the blood oxygen saturation value H0 is within the preset time T'. q The difference between the preset blood oxygen saturation qualified value H0 continues to be within the second preset range, and the adjustment is made according to the real-time situation.

[0094] Similarly, if the required adjustment amount is negative, the duty cycle P of the pressure generating assembly 300 is set to the lowest value within the preset duty cycle P range corresponding to the target gear. Because a negative required adjustment amount indicates that the oxygen user's body demand for oxygen is low and their current physical condition is relatively good, the oxygen generator can reduce power consumption. Therefore, the oxygen generator begins supplying oxygen at the lowest power consumption state within the power consumption range (duty cycle P range) corresponding to the corresponding gear. If the oxygen concentration is acceptable, the lowest duty cycle P value is maintained without further upward adjustment. If the oxygen concentration is unacceptable, the duty cycle P value can be increased until it reaches the acceptable level, stopping the increase. This method can find the lowest power consumption state while ensuring the acceptable oxygen concentration. If the oxygen concentration continues to be unacceptable, the control system 200 will issue an alarm signal.

[0095] By following the blood oxygen level, the control system 200 compares the real-time blood oxygen saturation value H q The target gear is determined by comparing the result of adjusting the blood oxygen saturation level and the preset qualified blood oxygen saturation value H0. Each target gear corresponds to a range of effective path L values ​​and a duty cycle P value of the pressure generating component 300. After adjusting to the target gear, even taking the maximum value of the corresponding duty cycle P range of the pressure generating component 300 can effectively reduce power consumption. Further distinguishing between positive and negative values ​​of the adjustment value can determine the direction of searching for the lowest power consumption, further achieving the goal of minimizing power consumption when optimally matching user usage.

[0096] The pipeline diameter adjustment component 600 of the low-power blood oxygen saturation value following oxygen generator can have various forms. The structure of the pipeline diameter adjustment component 600 is a plurality of pipelines arranged in parallel, and at least one of the plurality of pipelines arranged in parallel is provided with a throttling element and / or a solenoid valve 3 and / or an electronically controlled flow valve 5.

[0097] In a specific embodiment, there may be three parallel pipelines, each equipped with a two-position, two-way solenoid valve 3. The solenoid valve 3 opens and closes in response to control signals from the control system 200, thereby controlling the number of ventilation pipelines. When all three pipelines are open, the effective ventilation area of ​​the entire oxygen delivery pipeline 500 is maximized. Because the opening and closing of each pipeline is controlled by the solenoid valve 3 switching between the two states of either on or off, the adjustment speed is extremely fast.

[0098] In other embodiments, some branches 4 of the parallel pipeline may be provided with throttles and solenoid valves 3, while other branches 4 may be provided with electronically controlled flow valves 5. The electronically controlled flow valves 5 may be proportional valves. Because the electronically controlled flow valves 5 can measure from zero, there is no need to provide throttles or electronically controlled flow valves 3 on the branches 4 of the electronically controlled flow valves. When the electronically controlled flow valves 5 are closed, the branches 4 in which they are located are also closed. This approach allows for the use of branches 4 with throttles to compensate for insufficient ventilation capacity provided by a single branch 4 controlled by the electronically controlled flow valves 5.

[0099] In another embodiment, the pipeline diameter adjustment component 600 is an electric control flow valve 5, which can be a proportional valve, including electromagnetic, electric, electro-hydraulic and other types. Figure 5 As shown, the electrically controlled flow valve 5 includes at least one inlet port A and at least one outlet port B, which are connected in series to an oxygen supply pipeline 500 (not shown). The electrically controlled flow valve 5 adjusts the valve opening in response to a control signal from the control system 200, thereby adjusting the effective diameter L of the oxygen supply pipeline 500. The provision of a single branch 4, instead of multiple parallel branches 4, simplifies the overall structure and facilitates miniaturization of the oxygen generator.

[0100] According to the knowledge of fluid mechanics, the effective diameter L of the electric control flow valve 5 is not convenient to express, so the effective diameter L of the electric control flow valve 5 can be calibrated with the help of a standardized throttling device 1 and pre-stored in the control system 200.

[0101] The standardized throttling element 1 can be, for example Figure 3A 、 3B As shown, a throttle element with a fixed length, consisting of a hollow cylinder 2 at its center and cylindrical sidewalls on its exterior, can be used. In a specific embodiment, a hollow cylindrical throttle element with an inner diameter of 3mm and an outer diameter of 6mm can be used, with the outer wall of the throttle element abutting against the ventilation line. Therefore, when a single pipeline equipped with a standardized throttle element 1 is connected, its effective diameter L is 3mm. When two pipelines are connected in parallel, the effective diameter L is 3mm*2=6mm. Fluid mechanics shows that the diameter of parallel standard circular cross-sections can be directly calculated by adding the cross-sectional diameters of the individual standard components.

[0102] The effective diameter L of the electric control flow valve 5 can be obtained by calibrating the standard pipeline diameter adjustment component 600 composed of the above-mentioned standardized throttling element 1. The standard pipeline diameter adjustment component 600 refers to, Figure 4 As shown, several branches 4 are connected in parallel. Each branch 4 is equipped with a solenoid valve 3 (for opening and closing that branch 4) and a standardized throttle element 1. The throttle element is oriented along the oxygen delivery pipeline 500 (not shown). The solenoid valve 3 opens or closes in response to the control system 200. When only the solenoid valve 3 on one branch 4 is connected, the effective diameter L of the pipeline diameter adjustment assembly 600 is the lowest.

[0103] The steps for calibrating the effective diameter L of the electric-controlled flow valve 5 using the standard throttling device 1 may be: when the power source is the same (i.e., the gas source parameters entering the pipeline diameter adjustment component 600 are the same), and the output flow rate is the same, it can be determined that the effective diameter L of the non-standard pipeline diameter adjustment component 600 is the same as the effective diameter L of the standard pipeline diameter adjustment component 600.

[0104] In a specific embodiment, Figure 4 The pipe diameter adjustment component 600 is used as the standard. Figure 5 The pipeline diameter adjustment component 600 is calibrated to determine how many degrees the motor of the electronically controlled flow valve 5 rotates, and the corresponding equivalent effective diameter L is how much, the method is: Figure 5 As shown in the figure, the air inlet end of the pipeline diameter adjustment component 600 is A, the air outlet end is B, and it is connected in series in the oxygen supply pipeline 500 (not shown in the figure). Figure 4 、 5 When the gas source at end A and the flow rate at end B are the same, Figure 5 The effective diameter L of the embodiment 等效 That is Figure 4 The effective path L of the i parallel and connected branches 4 i The sum of Among them, L i That is, the diameter of the hollow cylinder 2 of the standardized throttle element 1 of a single branch 4.

[0105] In one embodiment, the proportional valve adopts a micro flow control valve structure composed of a needle valve and a stepper motor. 等效 It corresponds to the angle of rotation of a motor, that is, the output shaft of the stepper motor rotates circumferentially in response to the control system 200. The circumferential rotation of the stepper motor is converted into the axial displacement of the needle valve inside the valve body through the threaded matching structure inside the valve, thereby realizing the adjustment of different sizes of the valve effective diameter L.

[0106] The above is a method for calibrating the effective diameter L of a non-standard pipeline diameter adjustment component 600 through a standard pipeline diameter adjustment component 600. Each target gear corresponds to an effective diameter L value. The calibrated parameters (such as the correspondence between the effective diameter L and the rotation angle of the motor) are preset in the control system and can be called at any time according to the operation of the program.

[0107] This application also provides a low-power blood oxygen saturation tracking oxygen production method. This method is used in an oxygen production device and can effectively reduce power consumption by adjusting the oxygen production capacity accordingly by tracking the user's blood oxygen saturation value in real time. The oxygen production device can be a portable molecular sieve oxygen concentrator, including a control system 200, a pressure generating component 300, an adsorption component 400, an oxygen supply pipeline 500, a pipeline diameter adjustment component 600, and a blood oxygen detection component 100.

[0108] The pressure generating component 300 is used to compress the air, convert it into high-pressure air, and then transmit it to the adsorption component 400. The adsorption component 400 is equipped with an adsorbent with different adsorption forces for nitrogen and oxygen. The adsorbent can be a zeolite molecular sieve, which adsorbs nitrogen in the air under high pressure. The unadsorbed oxygen gathers at the top of the adsorption component 400 and desorbs it under normal pressure. The nitrogen is released and discharged as waste gas, while the oxygen is collected and transmitted to the oxygen-using object (or user) through the oxygen supply pipeline 500. The blood oxygen detection component 100 is used to detect the user's blood oxygen saturation value. Generally, if the blood oxygen saturation value is lower than 94%, it is considered to be insufficient oxygen supply. The pipeline diameter adjustment component 600 is arranged in the oxygen supply pipeline 500 and is used to adjust the effective diameter L of the oxygen supply pipeline 500. The control system 200 is the core and is communicated with the pressure generating component 300, the adsorption component 400, the pipeline diameter adjustment component 600 and the blood oxygen detection component 100 for receiving and sending signals.

[0109] The specific steps are:

[0110] Step 1: The control system 200 receives the blood oxygen saturation value H in real time q And compare it with the preset qualified value H0 of blood oxygen saturation.

[0111] The blood oxygen detection component 100 detects the user's blood oxygen saturation value in real time and sends it to the control system 200. The control system 200 periodically receives the real-time blood oxygen saturation value H q The comparison is performed with a preset qualified blood oxygen saturation value H0, which can be set to 94%. In a specific embodiment, the time interval for the regular comparison can be 5 seconds. Because the user's blood oxygen saturation value may change due to health conditions, geographical environment, and mood changes, the regular time interval should not be too long to timely adjust the operating parameters of the oxygen generator according to the user's physical condition.

[0112] Step 2: The control system 200 determines the adjustment amount of the gear position of the oxygen generator according to the comparison result, and determines the target gear position according to the adjustment amount.

[0113] Step 3: The control system 200 adjusts the duty cycle P of the pressure generating assembly 300 and the effective diameter L of the oxygen supply pipeline 500 according to the target gear position to achieve tracking of the oxygen supply capacity and the user's blood oxygen saturation value.

[0114] Different gear positions correspond to different flow rates. The flow rate can be varied by adjusting the duty cycle P of the pressure generating assembly 300. However, if the duty cycle P of the pressure generating assembly 300 is simply reduced, the output oxygen concentration may not meet the specified value when it drops below a certain critical value. For example, medical oxygen generators must produce oxygen at a concentration of 93% as specified in YY 1468-2016, "Oxygen Concentrator Supply Systems for Medical Gas Pipeline Systems." In this case, by reducing the effective diameter L of the oxygen supply pipeline 500, the resistance to the pressure drop within the adsorption assembly 400 (molecular sieve cartridge) caused by the discharge of oxygen can be increased. This can compensate for the excessive decrease in air pressure within the adsorption assembly 400 caused by the reduction in the duty cycle P of the pressure generating assembly 300. Because the zeolite molecular sieve within the adsorption assembly 400 absorbs nitrogen from the air through the principle of pressure swing adsorption, increasing the pressure within the adsorption assembly 400 increases the adsorption capacity of the zeolite molecular sieve, thereby increasing the output oxygen concentration.

[0115] The pressure generating assembly 300 is a major source of power consumption for the oxygen concentrator. Reducing the duty cycle P of the pressure generating assembly 300 can reduce power consumption. By using blood oxygen tracking, the duty cycle P of the pressure generating assembly 300 and the effective diameter L of the oxygen delivery pipeline 500 are adjusted according to the user's oxygen demand. This allows the oxygen concentrator to dynamically operate and effectively reduce power consumption while still meeting the user's physical needs. This significantly extends the oxygen concentrator's operating time when it's not connected to mains power, enhancing the user experience.

[0116] In steps 1 and 2, the control system 200 receives the blood oxygen saturation value H in real time. q The specific process of comparing the preset blood oxygen saturation qualified value H0 and determining the adjustment amount of the oxygen generator gear according to the comparison result is as follows:

[0117] According to the real-time received blood oxygen saturation value H q The difference between the preset blood oxygen saturation qualified value H0 is different, corresponding to different adjustment amounts. If the real-time blood oxygen saturation value H q When the blood oxygen saturation value H0 exceeds the first preset range, it means that the user is in good physical condition and does not need such a high oxygen supply. The adjustment amount should be negative, that is, the gear should be reduced. If the real-time blood oxygen saturation value H qWhen the oxygen saturation value H0 is less than the preset qualified value and exceeds the first preset range, it means that the oxygen supply of the oxygen generator cannot meet the needs of the user. The adjustment amount should be positive, that is, the gear should be increased. The real-time oxygen saturation value H q When the difference between the real-time blood oxygen saturation value H0 and the preset qualified value is not big, the gear should be adjusted by a small amount. On the contrary, the real-time blood oxygen saturation value H q If the difference between the preset blood oxygen saturation qualified value H0 is large, the gear should be adjusted by a large amount. q The absolute value of the difference between the preset blood oxygen saturation qualified value H0 corresponds to the preset absolute value of the corresponding adjustment amount.

[0118] The specific correlations are as shown in the preset rules in Table 1.

[0119] In this application, adjusting the gear of the oxygen generator refers to changing the flow rate of the oxygen generator. The relationship between the flow rate and the target gear can be preset in the control system 200 before leaving the factory. In one embodiment, each target gear corresponds to a flow rate interval, such as greater than or equal to 1L / min and less than 2L / min for gear 1, and greater than or equal to 2L / min and less than 3L / min for gear 2. Because the target gear is an interval, each target gear corresponds to an interval of an effective path L value and a duty cycle P value of the pressure generating component 300. According to the target gear, the control system 200 controls and adjusts to the corresponding effective path L value, and then searches for the minimum value of the duty cycle P suitable for the user within the duty cycle P interval of the pressure generating component 300 corresponding to the target gear. The correspondence between the interval of the effective path L value and the duty cycle P and the target gear is the result obtained through clinical experiments. , pre-set in the system, compared with the solution of just adjusting the effective path L value, because the duty cycle P is also decreasing, it has lower power consumption; because when the gear is reduced and the duty cycle P is reduced, the effective path L will also be reduced, so compared with the solution of just adjusting the duty cycle P, it can better ensure that the oxygen concentration remains qualified under the lowest possible duty cycle P. This realizes the outstanding advantage of the small portable oxygen concentrator when used outdoors, that is, it is portable and has a long oxygen supply time. Combined with the blood oxygen saturation value that follows the user at any time to adjust, it identifies the user's demand for oxygen. When the demand decreases, that is, when the physical condition is good, it will automatically lower the gear, so it has the advantages of low power consumption and energy saving.

[0120] In order to further find the lowest power consumption value of the oxygen generator that best matches the user's blood oxygen saturation value, the method for determining the minimum value of the duty cycle P suitable for the user within the duty cycle P range of the pressure generating component 300 is different depending on the positive or negative adjustment amount of the gear position.

[0121] If the amount to be adjusted is positive, the duty cycle P of the pressure generating component takes the highest value within the preset duty cycle P interval corresponding to the target gear, and is maintained for a preset time T';

[0122] If the blood oxygen saturation value H is detected within time T' q The difference between the value of the duty cycle P and the preset qualified value of blood oxygen saturation H0 is always within the second preset range (the second preset range and the first preset range may be the same or different, and they may be the same here), then the value of the duty cycle P decreases from the highest value in the preset interval until the oxygen concentration fails to meet the requirements, or reaches the lowest value in the preset interval of the duty cycle P, or the blood oxygen saturation value H q When the qualified value H0 of the blood oxygen saturation exceeds the preset range, the lowest power consumption point is found. The lowest power consumption is the lowest value of the duty cycle P when other conditions are met.

[0123] If the oxygen concentration is unqualified, the duty cycle P is reversed to the qualified oxygen concentration line and the increase of the duty cycle P is stopped. This is because the premise of minimum power consumption is that the oxygen concentration meets the qualified value, such as meeting the requirement that the output oxygen concentration of the medical oxygen concentrator is not less than 93%.

[0124] The range of effective flow path L and duty cycle P corresponding to the preset gear positions can be determined through extensive experimental data. This range ensures that the average blood oxygen saturation value is adjusted to the desired value within this flow path L and duty cycle P range. However, due to varying environments in which oxygen concentrators are located, such as at varying altitudes or atmospheric pressures, or due to varying service life of the molecular sieve within the concentrator, the oxygen concentration may vary at the same duty cycle P and effective flow path L. Lower oxygen concentrations generally correspond to lower power consumption. Therefore, within a range that satisfies the user's blood oxygen saturation, it is necessary to find the lowest power consumption position where the oxygen concentration approaches the unacceptable level while maintaining acceptable oxygen concentration. This is the lowest duty cycle P value. This allows for the lowest power consumption of the oxygen concentrator. This is particularly true for portable oxygen concentrators, which are often carried outdoors. Maintaining the lowest power consumption means longer operation, a significant advantage of portable oxygen concentrators. If the oxygen concentration continues to be substandard, the control system 200 issues an alarm. Because each gear corresponds to an effective path L value and a duty cycle P value range for the pressure generating assembly 300, if the oxygen production capacity is unable to meet the preset oxygen concentration requirements, there may be a problem with other components within the device, such as the molecular sieve being used for too long or being humidified by the environment, resulting in a decrease in oxygen production performance. In this case, an alarm may be issued, prompting the user to check whether other components within the oxygen generator are functioning properly or if the user's condition requires additional treatment.

[0125] If the blood oxygen saturation value H is detected within time T' q The difference between the blood oxygen saturation qualified value H0 and the preset blood oxygen saturation qualified value H0 exceeds the second preset range (the range can be the same as the first preset range or a separately set range), then the blood oxygen saturation value H0 is detected again. q The difference between the blood oxygen saturation qualified value H0 and the adjusted amount is determined, and a new adjustment cycle is entered. The new adjustment cycle is to continue to determine the target gear according to the adjusted amount and continuously monitor whether the blood oxygen saturation value H0 is within the preset time T'. q The difference between the preset blood oxygen saturation qualified value H0 is within a second preset range, and the adjustment is made according to the real-time situation.

[0126] If the amount to be adjusted is negative, it means that the oxygen user is in good physical condition and does not need much oxygen. In this case, the duty cycle P of the pressure generating component 300 takes the lowest value within the preset duty cycle P range. If the oxygen concentration is qualified, the requirement can be met by maintaining the minimum value of the minimum duty cycle P. If the oxygen concentration is unqualified, the duty cycle P can be increased until the oxygen concentration is qualified and then stopped increasing. If the oxygen concentration continues to be unqualified, the control system 200 will issue an alarm signal.

[0127] The purpose of adjusting the duty cycle P within the interval is to reduce power consumption as much as possible while meeting the needs of the oxygen-using object. However, by changing the positive and negative values ​​of the amount to be adjusted and the way to adjust the duty cycle P, it can be well combined with the actual situation of the oxygen-using object.

[0128] The application of the method provided by the present invention in a specific scenario is as follows:

[0129] The oxygen generator is connected to a finger-clip oximeter via Bluetooth. The oximeter is clipped on the user's finger. The control system 200 of the oxygen generator receives the blood oxygen saturation value H detected by the oximeter in real time. q The preset standard blood oxygen saturation value H0 in the system is 94%. The control system 200 updates the real-time blood oxygen saturation value H0 at a frequency of 5 seconds. q Compared with the preset blood oxygen saturation qualified value H0, the total number of gears of the oxygen generator is 6 gears.

[0130] The relationship between the gear position, the compressor duty cycle P and the effective diameter L is shown in Table 2:

[0131] gear Flow rate (L / min) P(％) L(mm) 1 0.17～2.25 18～24 0.1 2 0.38～0.46 28～34 0.2 3 0.59～0.67 38～44 0.3 4 0.80～0.86 48～54 0.4 5 0.98～1.05 58～64 0.5 6 1.17～1.24 68～74 0.6

[0132] Here, a simple throttling device is used, and different throttling devices are connected in parallel to achieve different changes in the size of the effective diameter L. The parallel connection is achieved by opening and closing several branches through the solenoid valve. A throttling device with an aperture of 0.1mm and a length of 1cm is connected in parallel on each branch. There are a total of six branches, and each branch is equipped with one, such as Figure 6 shown.

[0133] Take the parameters when the user's blood oxygen fluctuates for observation. Before the blood oxygen fluctuates widely in a certain period of time, the oxygen generator is running at gear 3, with an oxygen concentration of 93.5%. When the user's blood oxygen concentration rises from 94% to 96%, the adjustment relationship preset in the control system program is shown in Table 1 above, where ΔH% = (H q -H0) / H0; According to the calculation, ΔH=2.1. The adjustment amount should be reduced by 3 gears. Finally, the oxygen concentrator is adjusted to gear 1 (because it is necessary to always ensure oxygen supply to the user, so when the value of the target gear exceeds or equals the value of the current gear, it can be adjusted to the lowest gear). The output oxygen concentration is 93.1%, and the blood oxygen concentration fluctuates around 93.8%, and it continues to run for 10s. There are still adjustments to be made later, which will not be repeated here. This method detects the blood oxygen saturation value of the oxygen user in real time and adjusts the oxygen production capacity of the oxygen concentrator accordingly. When the oxygen demand of the oxygen user is high, the oxygen production capacity is increased. When the oxygen demand of the oxygen user is low, the oxygen production capacity is reduced, so as to avoid the oxygen concentrator from continuously operating in the same working state that can meet the needs of the oxygen user but has high power consumption. Furthermore, by coordinating the duty cycle P of the pressure generating assembly 300 and the effective diameter L of the oxygen delivery pipeline 500, and adjusting the effective diameter L, the oxygen concentrator achieves lower power consumption while still providing qualified oxygen supply. Furthermore, within each gear, the direction of searching for the lowest power consumption can be determined based on the positive or negative value of the adjustment, further minimizing power consumption while optimally matching user needs.

[0134] The above descriptions are embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A low-power blood oxygen saturation value-following oxygen generator, characterized by: A control system for receiving the signal value and generating a control signal; a pressure generating component for converting air into pressurized air in response to the control signal; The adsorption component is loaded with adsorbents with different nitrogen adsorption capacities at different pressures and generates oxygen required by the oxygen-using object through the pressure swing adsorption principle of pressurized air; An oxygen delivery pipeline, used to deliver the oxygen generated by the adsorption component to an oxygen user; A pipeline diameter adjustment component is provided in the oxygen delivery pipeline and adjusts the effective diameter L of the oxygen delivery pipeline in response to a control signal of the control system; A blood oxygen detection component is used to detect the user's blood oxygen saturation value and send the detected blood oxygen saturation value to the control system; The control system receives the blood oxygen saturation value H in real time. q The pressure generating assembly is compared with a preset qualified blood oxygen saturation value H0, and an adjustment amount of the gear position of the oxygen generator is determined based on the comparison result. The control system determines a target gear position based on the adjustment amount, and adjusts the duty cycle P of the pressure generating assembly and the effective diameter L of the oxygen supply pipeline based on the target gear position to achieve tracking of the oxygen supply capacity and the user's blood oxygen saturation; The control system receives the blood oxygen saturation value H in real time. q The specific steps of comparing the preset qualified value H0 of the blood oxygen saturation and determining the adjustment amount of the gear position of the oxygen generator according to the comparison result are as follows: When the real-time blood oxygen saturation value H q When the value is greater than the preset blood oxygen saturation qualified value H0 and exceeds the first preset range, the adjustment amount should be negative; When the real-time blood oxygen saturation value H q When the value is less than the preset blood oxygen saturation qualified value H0 and exceeds the first preset range, the adjustment amount should be positive; According to the real-time received blood oxygen saturation value H q The absolute value of the difference between the preset blood oxygen saturation qualified value H0 corresponds to the preset absolute value of the corresponding adjustment amount; Each target gear corresponds to a flow range; Each target gear corresponds to an effective diameter L value and a duty cycle P value of the pressure generating component. That is, the flow rate of the target gear is adjusted by adjusting the duty cycle P of the pressure generating component under this effective diameter L. If the amount to be adjusted is positive, the duty cycle P of the pressure generating component takes the highest value within the preset duty cycle P interval corresponding to the target gear, and is maintained for a preset time T'; If the blood oxygen saturation value H is detected within time T' q If the difference between the preset oxygen saturation qualified value H0 and the preset duty cycle P is always within the second preset range, the oxygen concentration will decrease from the highest value in the preset duty cycle P interval until the oxygen concentration fails to meet the requirements, or reaches the lowest value in the preset duty cycle P interval, or the oxygen saturation value H0 is less than the preset duty cycle P interval. q Until the qualified value H0 of the blood oxygen saturation exceeds the preset range, if the oxygen concentration is unqualified, the duty cycle P is reversed to the qualified oxygen concentration line and the increase of the duty cycle P is stopped. If the oxygen concentration continues to be unqualified, the control system will issue an alarm signal; If the amount to be adjusted is negative, the duty cycle P of the pressure generating component takes the lowest value within the preset duty cycle P range. If the oxygen concentration is qualified, the duty cycle P is maintained at the lowest value of the range. If the oxygen concentration is unqualified, the duty cycle P can be increased until the oxygen concentration is qualified and then stopped increasing. If the oxygen concentration continues to be unqualified, the control system will issue an alarm signal.

2. The low-power blood oxygen saturation value-following oxygen generator according to claim 1, characterized in that: The control system receives the blood oxygen saturation value H in real time. q The specific process of comparing the received blood oxygen saturation value H0 with the preset qualified value of blood oxygen saturation is that the control system regularly compares the received blood oxygen saturation value H0 with the preset qualified value of blood oxygen saturation H0 according to the preset time interval. q Compare it with the preset qualified value H0 of blood oxygen saturation.

3. The low-power blood oxygen saturation value-following oxygen generator according to claim 1, characterized in that: If the blood oxygen saturation value H is detected within time T' q If the difference between the blood oxygen saturation qualified value H0 exceeds the second preset range, the blood oxygen saturation value H0 is detected again. q The difference between the preset blood oxygen saturation qualified value H0 determines the amount to be adjusted and enters a new adjustment cycle.

4. The low-power blood oxygen saturation value-following oxygen generator according to claim 1, characterized in that: The structure of the pipeline diameter adjustment component is a plurality of pipelines arranged in parallel, and at least one of the plurality of pipelines arranged in parallel is provided with a throttling element and / or an electrically controlled flow valve.

5. The low-power blood oxygen saturation value-following oxygen generator according to claim 4, characterized in that: The pipeline diameter adjustment component is an electrically controlled flow valve, which includes at least one air inlet end and at least one air outlet end. At least one of the air inlet end and at least one of the air outlet ends are connected in series in the oxygen supply pipeline. The electrically controlled flow valve adjusts the valve opening in response to the control signal of the control system and thereby adjusts the effective diameter L of the oxygen supply pipeline.

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