Oxygen concentrator with oxygen output concentration monitoring and pre-compensation function

Abstract

This invention relates to the field of oxygen concentrator technology, specifically to an oxygen concentrator with oxygen output concentration monitoring and pre-compensation functions. The oxygen concentrator includes a lower buffer valve, a lower buffer connecting valve, an upper buffer valve, a lower buffer valve, a data acquisition module, a data processing module, and an adjustment module. The data acquisition module collects pressure data and oxygen concentration at the oxygen concentrator outlet. The data processing module obtains the high pressure level for each cycle based on the pressure data and oxygen concentration at the outlet during each oxygen discharge cycle, thereby determining the high pressure duration and the current compensation requirement. It also obtains a gradual pressure equalization demand factor based on the current compensation requirement and the duration of the high pressure duration. The adjustment module regulates the opening and closing of the valves according to the gradual pressure equalization demand factor. This invention reduces the impact of temperature on the adsorption efficiency of zeolite molecular sieves, maintains the concentration of oxygen produced by the oxygen concentrator, and achieves pre-compensation for oxygen concentration.

Description

Technical Field

[0001] This invention relates to the field of oxygen generator technology, specifically to an oxygen generator with oxygen output concentration monitoring and pre-compensation functions. Background Technology

[0002] Oxygen plays an indispensable role in hospital emergency care, anesthesia, surgery, and treatment, and is of paramount importance in medical care. Compared to other oxygen generation technologies, Pressure Swing Adsorption (PSA) oxygen generation technology is not only simple and efficient to operate, but also boasts excellent controllability, allowing users to flexibly meet different needs. PSA oxygen generation technology is also characterized by low energy consumption, effectively reducing operating costs and further highlighting its superior performance in the field of oxygen generation, making it a primary oxygen source for hospitals.

[0003] Oxygen generators require multiple cycles during oxygen production, with each cycle consisting of two oxygen venting cycles. Since it takes time for oxygen to enter the tower from the inlet, be adsorbed, and then be vented, the pressure and oxygen concentration fluctuate during each oxygen venting cycle. Pressure swing adsorption utilizes the adsorption effect of zeolite molecular sieves on nitrogen under high pressure and low temperature. Under normal circumstances, the air compressor compresses air into high-pressure gas, generating high temperatures during the compression process. Cooling lowers the gas temperature, thereby executing the oxygen production cycle.

[0004] When the oxygen demand is high, the air compressor will increase the pressure generated by the oxygen generator, thereby improving the adsorption efficiency and reducing the adsorption time required for each cycle. During this process, oxygen and nitrogen molecules in the air will collide with the zeolite molecular sieve. As the pressure in the tower increases, the amount of nitrogen adsorbed will decrease when the temperature rises. Furthermore, when one tower is adsorbing while another tower is desorbing, the remaining adsorbed oxygen will enter the other tower through the upper buffer valve. During the pressure equalization stage, a large amount of other heated gases will directly enter the other tower, thereby heating the zeolite there, reducing the adsorption efficiency, and making it difficult to maintain the concentration of oxygen produced by the oxygen generator. Summary of the Invention

[0005] To address the problem that existing oxygen concentrators are not conducive to maintaining the concentration of oxygen produced, the present invention aims to provide an oxygen concentrator with oxygen output concentration monitoring and pre-compensation functions. The specific technical solution adopted is as follows:

[0006] This invention provides an oxygen generator with oxygen output concentration monitoring and pre-compensation functions. The oxygen generator includes a lower buffer valve, a lower buffer connecting valve, an upper buffer valve, a data acquisition module, a data processing module, and an adjustment module.

[0007] The data acquisition module is used to collect pressure data and oxygen concentration at the outlet of the oxygen concentrator;

[0008] The data processing module is used to obtain the high pressure level of each cycle based on the distribution characteristics of the pressure data at the outlet and the change characteristics of the oxygen concentration in each cycle of oxygen discharge; to determine the high pressure duration and the current compensation demand based on the relative change between the high pressure level of each cycle and the previous cycle; and to obtain the slow-averaging pressure demand factor based on the current compensation demand and the duration of the high pressure duration.

[0009] The adjustment module is used to determine the opening time of the upper pressure equalization valve in the next cycle if the slow pressure equalization demand factor is less than the preset demand threshold; if the slow pressure equalization demand factor is greater than or equal to the preset demand threshold, the lower buffer connecting valve is opened in the pressure equalization stage of the next cycle, and the pressure equalization is weakened by using the upper buffer valve and the lower buffer valve.

[0010] Preferably, the period division for each cycle includes:

[0011] For any given iteration:

[0012] Calculate the pressure increment between any two adjacent moments in any given cycle;

[0013] The first of two adjacent moments corresponding to the first negative value of the pressure increment is used as the dividing point to divide any one cycle into the first cycle and the second cycle.

[0014] Preferably, obtaining the high pressure level for each cycle based on the distribution characteristics of the pressure data at the outlet and the variation characteristics of the oxygen concentration in each cycle of oxygen discharge includes:

[0015] For any given iteration:

[0016] For any given period, the ratio of the maximum pressure value within that period to the duration of the same period is taken as the pressure high-pressure coefficient for that period. A curve is fitted to the oxygen concentration at all times within that period to obtain a fitted curve. The first and last points of the fitted curve are connected by a straight line to obtain the slope of the straight line. The negative correlation mapping value of the slope is taken as the concentration high-pressure coefficient for that period.

[0017] By combining the high-pressure coefficients and high-pressure concentration coefficients of all cycles in any given cycle, the high-pressure level of that cycle is obtained.

[0018] Preferably, obtaining the high pressure level of any given cycle by combining the high pressure coefficients and concentration high pressure coefficients of all cycles in any given cycle includes:

[0019] For any given period, the product of the pressure high-pressure coefficient and the concentration high-pressure coefficient for that period is denoted as the first characteristic value of that period.

[0020] The normalized result of the average of the first characteristic values ​​of all cycles in any given cycle is determined as the high pressure level of that given cycle.

[0021] Preferably, determining the high-pressure duration based on the relative change in high-pressure level between each cycle and the previous cycle includes:

[0022] The loop preceding and adjacent to the current loop is taken as the starting loop. Then, n loops are sequentially selected as reference loops from back to front. If the average high-pressure level of the n reference loops is less than a preset high-pressure threshold, these n reference loops are considered a high-pressure duration period. If the average high-pressure level of the n reference loops is greater than or equal to the preset high-pressure threshold, n+1 loops are selected as reference loops. When the average high-pressure level of the n+1 reference loops is less than the preset high-pressure threshold, these n+1 reference loops are considered a high-pressure duration period. When the average high-pressure level of the n+1 reference loops is greater than or equal to the preset high-pressure threshold, n+2 loops are selected as reference loops, and so on, until the average high-pressure level of all selected reference loops is less than the preset high-pressure threshold. All selected reference loops are then considered a high-pressure duration period.

[0023] Where n is the preset quantity.

[0024] Preferably, the acquisition of the current compensation demand includes:

[0025] The difference between the average high pressure level of all reference cycles and the high pressure level of the current cycle is taken as the current compensation requirement.

[0026] Preferably, obtaining the pressure easing demand factor based on the current compensation demand level and the duration of the high-pressure period includes:

[0027] Based on the current compensation demand and the duration of the high-pressure period, the pressure easing demand factor is calculated. Both the current compensation demand and the duration of the high-pressure period are positively correlated with the pressure easing demand factor.

[0028] Preferably, the step of calculating the pressure easing demand factor based on the current compensation demand level and the duration of the high-pressure period includes:

[0029] The normalized result of the product of the current compensation demand and the duration of the high-pressure period is determined as the pressure easing demand factor.

[0030] Preferably, determining the opening time of the upper pressure equalizing valve in advance for the next cycle includes:

[0031] The first duration is the result of rounding up the product of half the duration of one cycle and the gradual pressure equalization demand factor.

[0032] The time corresponding to the first duration in the next cycle is determined as the opening time for the upper pressure equalization valve to be opened in advance in the next cycle.

[0033] Preferably, calculating the pressure increment between any two adjacent moments in any given cycle includes:

[0034] The difference between the pressure data of the second time step and the pressure data of the first time step in any two adjacent time steps in any given cycle is taken as the pressure increment of the corresponding two adjacent time steps.

[0035] The present invention has at least the following beneficial effects:

[0036] The oxygen concentrator with oxygen output concentration monitoring and pre-compensation function provided by this invention adds a lower buffer valve, a lower buffer connecting valve, a data acquisition module, a data processing module, and an adjustment module to the existing oxygen concentrator. The data acquisition module is used to collect the pressure data and oxygen concentration at the outlet during the oxygen exhaust process. The data processing module determines the high pressure level of each cycle based on the distribution characteristics of the pressure data at the outlet and the change characteristics of the oxygen concentration in each cycle during the oxygen exhaust process, and then filters the high pressure duration period and determines the current compensation requirement. Combining the current compensation requirement and the duration of the high pressure duration period, it obtains... The slow-equalization pressure demand factor adjustment module determines whether the oxygen concentrator is under high load based on its magnitude. When the slow-equalization pressure demand factor is less than a preset demand threshold, the opening time of the upper equalization valve in the next cycle is determined in advance. When the slow-equalization pressure demand factor is greater than or equal to the preset demand threshold, the lower buffer connecting valve is opened in the equalization stage of the next cycle, using the upper and lower buffer valves to weaken the equalization. This invention avoids temperature rise in the dual towers of the oxygen concentrator by adjusting the opening and closing of the valves, reduces the impact of temperature on the adsorption efficiency of zeolite molecular sieves, maintains the concentration of oxygen produced by the oxygen concentrator, and achieves pre-compensation for oxygen concentration. Attached Figure Description

[0037] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a mechanical structure diagram of an oxygen generator with oxygen output concentration monitoring and pre-compensation functions provided in an embodiment of the present invention;

[0039] Figure 2 A flowchart illustrating the method performed by the oxygen generator with oxygen output concentration monitoring and pre-compensation function provided in this embodiment of the invention.

[0040] Figure 1 In the diagram, 1 is the oxygen release valve for tower a; 2 is the gas outlet for tower a; 3 is the tower body for tower a; 4 is the gas inlet for tower a; 5 is the waste gas outlet; 6 is the waste gas valve for tower a; 7 is the inlet valve for tower a; 8 is the flow control valve; 9 is the feed inlet; 10 is the inlet valve for tower b; 11 is the lower equalizing valve; 12 is the waste gas valve for tower b; 13 is the gas inlet for tower b; 14 is the tower body for tower b; 15 is the gas outlet for tower b; 16 is the upper equalizing valve; 17 is the upper buffer valve; 18 is the oxygen release valve for tower b; 19 is the oxygen outlet; 20 is the oxygen concentration monitor; 21 is the lower buffer valve; and 22 is the lower buffer connecting valve. Detailed Implementation

[0041] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the oxygen generator with oxygen output concentration monitoring and pre-compensation function proposed according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0043] The following description, in conjunction with the accompanying drawings, details a specific solution for an oxygen generator with oxygen output concentration monitoring and pre-compensation functions provided by the present invention.

[0044] Example of an oxygen concentrator with oxygen output concentration monitoring and pre-compensation function:

[0045] Please see Figure 1 This invention illustrates an oxygen generator with oxygen output concentration monitoring and pre-compensation functions according to an embodiment of the present invention. The oxygen generator includes an oxygen release valve 1 for tower a, a gas outlet 2 for tower a, tower body 3 for tower a, a gas inlet 4 for tower a, an exhaust outlet 5, an exhaust valve 6 for tower a, an inlet valve 7 for tower a, a flow control valve 8, a feed inlet 9, an inlet valve 10 for tower b, a lower equalizing valve 11, an exhaust valve 12 for tower b, a gas inlet 13 for tower b, a tower body 14 for tower b, a gas outlet 15 for tower b, an upper equalizing valve 16, an upper buffer valve 17, an oxygen release valve 18 for tower b, an oxygen outlet 19, an oxygen concentration monitor 20, a lower buffer valve 21, a lower buffer connecting valve 22, a data acquisition module, a data processing module, and an adjustment module, wherein the data acquisition module, data processing module, and adjustment module are not shown in the figure.

[0046] Among them, towers a and b contain zeolite adsorbent material to adsorb nitrogen gas entering the compressed gas through the gas inlet of each tower. The upper buffer valve 17 contains a buffer valve to gradually transfer the gas flow and prevent all oxygen from leaking into the other tank.

[0047] The main steps in oxygen production are:

[0048] First, initialize by closing all valves.

[0049] (1) Adsorption in tower a:

[0050] Open the inlet valve 7 of tower A, the oxygen release valve 1 of tower A, and the exhaust valve 12 of tower B. Compressed air enters tower body 3 of tower A through inlet 9 and gas inlet 4 of tower A. The zeolite molecular sieve in tower body 3 adsorbs nitrogen to obtain oxygen. The oxygen is divided into two paths. One path discharges oxygen from gas outlet 2 of tower A, enters oxygen outlet 19 through oxygen release valve 1 of tower A, and reaches the oxygen process tank for buffering. The other part enters tower body 14 of tower B through upper buffer valve 17 and gas outlet 15 of tower B, desorbs nitrogen adsorbed by the zeolite molecular sieve in tower body 14, and is discharged from exhaust valve 12 and exhaust outlet 5 of tower B.

[0051] (2) Pressure equalization stage:

[0052] After adsorption in column a for approximately 60 seconds, all valves are closed, and the lower equalizing valve 11 and the upper equalizing valve 16 are opened, allowing the high-pressure gas in column a to enter column b body 14 through the lower equalizing valve 11 and the upper equalizing valve 16. This step is to recover the high concentration of oxygen at the top of the zeolite molecular sieve and reduce the energy consumption of the compressor during the pressurization process.

[0053] (3) Adsorption in tower b:

[0054] Close the lower equalizing valve 11 and the upper equalizing valve 16, and open the B-tower inlet valve 10, the B-tower oxygen release valve 18, and the A-tower exhaust valve 6. Compressed air enters the B-tower body 14 through the feed inlet 9 and the B-tower inlet valve 10. The zeolite molecular sieve in the B-tower body 14 adsorbs nitrogen to obtain oxygen. The oxygen is divided into two paths. One path discharges oxygen from the B-tower gas outlet 15, enters the oxygen outlet 19 through the B-tower oxygen release valve 18, and reaches the oxygen process tank for buffering. The other part enters the A-tower body 3 through the upper buffer valve 17 and the A-tower gas outlet 2, desorbs the nitrogen already adsorbed by the zeolite molecular sieve in the A-tower body 3, and is discharged from the A-tower exhaust valve 6 and the exhaust outlet 5.

[0055] (4) Second pressure equalization stage:

[0056] After adsorption in tower b for approximately 60 seconds, close all valves and open the lower equalizing valve 11 and the upper equalizing valve 16, allowing the high-pressure gas in tower b to enter the tower body 3 of tower a through the lower equalizing valve 11 and the upper equalizing valve 16.

[0057] (5) Steps (1), (2), (3) and (4) constitute a cycle. Repeat the above steps. Oxygen can be generated in all stages except the pressure equalization stage.

[0058] In addition to the above-mentioned components, the oxygen generator with oxygen output concentration monitoring and pre-compensation function provided in this embodiment also includes a data acquisition module, a data processing module and an adjustment module;

[0059] The data acquisition module is used to collect pressure data and oxygen concentration at the outlet of the oxygen generator.

[0060] The data processing module is used to obtain the high pressure level of each cycle based on the distribution characteristics of the pressure data at the outlet and the change characteristics of the oxygen concentration in each cycle of oxygen discharge; to determine the high pressure duration and the current compensation demand based on the relative change between the high pressure level of each cycle and the previous cycle; and to obtain the slow-averaging pressure demand factor based on the current compensation demand and the duration of the high pressure duration.

[0061] The adjustment module is used to determine the opening time of the upper pressure equalization valve 16 in the next cycle if the slow pressure equalization demand factor is less than the preset demand threshold; if the slow pressure equalization demand factor is greater than or equal to the preset demand threshold, the lower buffer connecting valve 22 is opened in the pressure equalization stage of the next cycle, and the pressure equalization is weakened by using the upper buffer valve 17 and the lower buffer valve 21.

[0062] The method performed by the oxygen concentrator with oxygen output concentration monitoring and pre-compensation function provided in this embodiment is as follows: Figure 2 As shown.

[0063] During each oxygen venting cycle, oxygen enters the tower from the inlet, undergoes adsorption, and then is discharged, which takes time. Both pressure and oxygen concentration fluctuate during each cycle. The oxygen generator with oxygen output concentration monitoring and pre-compensation functions provided in this embodiment utilizes the paramagnetic effect of oxygen. The oxygen concentration monitor 20 in the data acquisition module monitors the oxygen concentration in each cycle of oxygen venting, and the pressure monitor in the data acquisition module collects the pressure data at the outlet. In this embodiment, the collection frequency for both oxygen concentration and pressure data is set to once every 0.1 seconds. In specific applications, the implementer can adjust the settings according to specific circumstances.

[0064] For the compression stage, the problems caused by pressurization and collision heating can be solved by reducing the cycle time. The solution to incomplete desorption in the other column is to open the upper equalization valve 16 in advance, allowing the gas to enter the other column without passing through the buffer valve, thus achieving pre-desorption. During the equalization stage, the moment the upper and lower equalization valves are opened, gas rapidly rushes into the other column, causing a significant pressure change. Gas molecules collide with the zeolite molecular sieve at low pressure, raising the temperature. When the next filtration cycle begins, the zeolite molecular sieve temperature is high, reducing adsorption efficiency. Therefore, the longer the heating time, the more necessary it is to slow down the amount of gas used for equalization. Specifically, during the equalization stage, the upper and lower equalization valves should not be opened; instead, the lower buffer valve should be opened, and equalization should be performed slowly through the upper and lower pressure-regulating valves, or even non-equalization should be implemented to avoid bidirectional impact on the zeolite molecular sieve.

[0065] After collecting pressure data and oxygen concentration at various times, the air entering the oxygen generator is cooled by a refrigerated dry cooler, and the oxygen temperature at the outlet is reset because the newly entering air is low temperature. The temperature only affects the temperature generated by the collision of oxygen molecules with the zeolite molecular sieve during pressure equalization and before the start of the next cycle, as well as the temperature generated by the collision of gas molecules due to drastic pressure changes. After a period of sieving, the zeolite molecular sieve is cooled by the newly entering air, thus restoring the normal oxygen concentration.

[0066] For each cycle, if the demand for oxygen production is higher, the air compressor will increase the compression pressure. The pressure increase before reaching its peak in that cycle indicates a high demand for oxygen. Therefore, this embodiment first divides each cycle into periods based on pressure data changes, and then determines the current pre-compensation demand based on the pressure changes within different periods.

[0067] Next, this embodiment will take one loop as an example for explanation. Other loops can be processed using the method provided in this embodiment.

[0068] Specifically, for any given loop:

[0069] The difference between the pressure data of the later time step and the pressure data of the earlier time step in each pair of adjacent time steps within this cycle is taken as the pressure increment for the corresponding two adjacent time steps. Using this method, the pressure increment for each pair of adjacent time steps in this cycle can be obtained, and there is a corresponding pressure increment for each pair of adjacent time steps. The time step preceding the pair of adjacent time steps corresponding to the first negative value among all the pressure increments obtained based on this cycle is taken as the dividing point. Using this dividing point, this cycle is divided into the first cycle and the second cycle. The first cycle is the stage when air is just injected into the tower body. At this time, the pressure rises from the uniform atmospheric pressure to high pressure. In the second cycle, after the filtered oxygen fills the tower body, the pressure continues to rise slowly due to the small outlet.

[0070] When the compressor pressure increases, air will quickly fill the tower body and enter the second cycle compared to normal conditions. Therefore, the first cycle time is shorter than normal. Also, due to the smaller outlet, the pressure will continue to rise after filling the tower, and the filtered oxygen will leave more slowly.

[0071] Under normal circumstances, as air slowly fills the tower, the zeolite molecular sieve comes into slow contact with the air, thereby adsorbing as many nitrogen molecules as possible. However, when the pressure increases, the airflow speed into the tower is faster than under normal conditions, reducing the probability of nitrogen molecules colliding with the air in the zeolite molecular sieve, resulting in a decrease in oxygen concentration. Therefore, the rate of increase in oxygen concentration will be slower.

[0072] For any given iteration:

[0073] For any period within this cycle, the ratio of the maximum pressure value within that period to the duration of that period is taken as the high-pressure coefficient for that period. A curve is fitted to the oxygen concentration at all times within that period to obtain a fitted curve. The slope of this curve is obtained by connecting the first and last points of the fitted curve. A smaller slope indicates a lower probability of nitrogen molecules being adsorbed compared to normal conditions after multiple collisions, thus leading to a decrease in oxygen concentration. Therefore, the negative correlation mapping value of this slope is taken as the high-pressure coefficient of concentration for that period. In this embodiment, the negative correlation mapping value of the slope is obtained by taking the reciprocal of the slope. It should be noted that the slope value will not be 0. The product of the high-pressure coefficient of pressure and the high-pressure coefficient of concentration for that period is recorded as the first characteristic value of that period. Using the above method, the first characteristic value for each period of this cycle can be obtained.

[0074] Next, the high-pressure coefficients and concentration high-pressure coefficients of all cycles in this cycle will be combined to obtain the high-pressure level of this cycle. Specifically, the normalized result of the average of the first characteristic value of all cycles in this cycle will be determined as the high-pressure level of this cycle. It should be noted that there are many data normalization methods. In this embodiment, the maximum-minimum value normalization method is used to normalize the average of the first characteristic value, so that the normalization result takes the value (0, 1). As for other implementation methods, other existing data normalization methods can also be selected, which will not be elaborated on here.

[0075] Using the above method, the high pressure level for each cycle can be obtained.

[0076] Furthermore, starting from the current cycle, the high-pressure duration period is selected backwards. The specific selection process is as follows:

[0077] The loop preceding and adjacent to the current loop is taken as the starting loop. Then, n loops are sequentially selected as reference loops in reverse chronological order. If the average high-pressure level of these n reference loops is less than a preset high-pressure threshold, these n reference loops are considered a high-pressure duration period. If the average high-pressure level of these n reference loops is greater than or equal to the preset high-pressure threshold, n+1 loops are selected as reference loops. When the average high-pressure level of these n+1 reference loops is less than the preset high-pressure threshold, these n+1 reference loops are considered a high-pressure duration period. When the average high-pressure level of these n+1 reference loops is greater than or equal to the preset high-pressure threshold, n+2 loops are selected as reference loops, and so on, until the average high-pressure level of all selected reference loops is less than the preset high-pressure threshold. All selected reference loops are then considered a high-pressure duration period. It should be noted that each reference loop obtained is based on the previous reference loop with one loop added before it. That is, the reference loop obtained for the first time is the n loops before the current loop, the reference loop obtained for the second time is the n+1 loops before the current loop, the reference loop obtained for the third time is the n+2 loops before the current loop, the reference loop obtained for the fourth time is the n+3 loops before the current loop, and so on, until the condition is met.

[0078] It should be noted that if all previous loops are used as reference loops, and the average high pressure level of all reference loops is still greater than or equal to the preset high pressure threshold, then all previous loops will be used as reference loops.

[0079] Where n is a preset quantity. In this embodiment, the preset high-voltage threshold is 0.5 and n is 3. In specific applications, the implementer can set it according to the specific situation.

[0080] After obtaining all reference cycles, the difference between the average high pressure level of all reference cycles and the high pressure level of the current cycle is taken as the current compensation requirement.

[0081] Since the only cooling measure inside the oxygen concentrator is the newly introduced dry, cold air, if the heat generated exceeds the heat consumed by the dry, cold air, the internal temperature of the oxygen concentrator will accumulate, leading to a decrease in oxygen concentration. Therefore, if the heating duration is short, the produced oxygen can be pre-desorbed by passing it into another tower. During the pressure equalization stage, nitrogen molecules are absorbed by the zeolite molecular sieve in the current tower, reducing the gas volume and collisions with the zeolite molecular sieve in the other tower, thus stopping the heating and achieving the cooling purpose. Therefore, air is only allowed to enter when the lower pressure equalization valve opens, and the generated oxygen cools the zeolite molecular sieve in the other tower. This portion of oxygen used for cooling can be recovered in the next cycle, avoiding the decrease in oxygen concentration caused by a large amount of air entering the other tower during the pressure equalization stage. However, this process consumes the amount of oxygen produced, so it is necessary to minimize losses. That is, when the heating effect is not significant, this method can be used for cooling, and the cooling time varies with the heating time. Based on this, this embodiment will determine the gradual pressure averaging demand for the current cycle according to the current pre-compensation demand and the duration of the high-pressure period, and obtain the gradual pressure averaging demand factor.

[0082] Specifically, a pressure easing demand factor is calculated based on the current compensation demand level and the duration of the high-pressure period. Both the current compensation demand level and the duration of the high-pressure period are positively correlated with the pressure easing demand factor.

[0083] Among them, a positive correlation means that the dependent variable increases as the independent variable increases, and the dependent variable decreases as the independent variable decreases. It can be an additive relationship, a multiplicative relationship, etc., which is determined by the actual application.

[0084] In this embodiment, the normalized result of the product of the current compensation demand and the duration of the high-pressure period is determined as the pressure easing demand factor. The current compensation demand represents the difference in high-pressure level between the current high-pressure period and the previous period without pressure increase. The larger the value, the greater the pressure easing demand in the current cycle; the longer the high-pressure period, the greater the pressure easing demand in the current cycle, that is, the greater the pressure easing demand factor.

[0085] After the data processing module determines the pressure equalization demand factor, the adjustment module will perform subsequent adjustment processing based on the pressure equalization demand factor.

[0086] Specifically, if the slow pressure equalization demand factor is less than the preset demand threshold, it indicates that the heating effect exhibited during the current high-pressure duration is not significant, and cooling can be achieved through unidirectional control. Therefore, it is necessary to determine the opening time of the upper pressure equalization valve 16 in the next cycle. The product of half the duration of one cycle and the slow pressure equalization demand factor, rounded up, is recorded as the first duration. The time corresponding to the next cycle reaching the first duration is determined as the opening time of the upper pressure equalization valve 16 in the next cycle. Before the end of the next cycle, the upper pressure equalization valve 16 is opened in advance, allowing a large amount of oxygen in the upper chamber of the tower to enter the other tower in advance before the pressure equalization stage, instead of only slowly entering through the buffer valve, thereby achieving a cooling effect. The earlier the advance time, the more obvious the cooling effect, but the more oxygen produced is wasted. Therefore, it is necessary to adaptively advance the opening time of the upper pressure equalization valve 16 based on the current pre-compensation demand.

[0087] If the slow pressure equalization demand factor is greater than or equal to the preset demand threshold, it indicates that the temperature rise during the high-pressure period is significant, and after a long period of temperature accumulation, timely cooling is necessary. If pressure equalization is performed at this time, the gas in the current tower will rapidly flow into the other tower, causing violent gas movement and temperature rise in the other tower. Therefore, if the current pre-compensation demand is too high, the lower buffer valve 21 and lower buffer connecting valve 22 installed in the oxygen generator in this embodiment can be used to weaken the pressure equalization. Originally, opening the pressure equalization valve directly connects the two towers, making their gas pressure equal. The buffer valve slows down the pressure equalization process, increasing compressor energy consumption but reducing temperature accumulation in the towers and increasing oxygen concentration. Therefore, if the slow pressure equalization demand factor is greater than or equal to the preset demand threshold, in the next cycle of pressure equalization, the upper and lower pressure equalization valves are not opened; instead, the lower buffer connecting valve 22 is opened, and the upper buffer valve 17 and lower buffer valve 21 are used to weaken the pressure equalization. In this embodiment, the preset demand threshold is 0.5; in specific applications, the implementer can set it according to the specific situation.

[0088] Thus, by using the above method, pre-compensation for the oxygen generation process has been achieved.

[0089] The oxygen concentrator with oxygen output concentration monitoring and pre-compensation function provided in this embodiment adds a lower buffer valve, a lower buffer connecting valve, a data acquisition module, a data processing module, and an adjustment module to the existing oxygen concentrator. The data acquisition module is used to collect the pressure data and oxygen concentration at the outlet during the oxygen exhaust process. The data processing module determines the high pressure level of each cycle based on the distribution characteristics of the pressure data at the outlet and the change characteristics of the oxygen concentration in each cycle during the oxygen exhaust process. Then, it filters the high pressure duration and determines the current compensation requirement. Combining the current compensation requirement and the duration of the high pressure duration, it obtains... The slow-equalization pressure demand factor adjustment module determines whether the oxygen concentrator is under high load based on its magnitude. When the slow-equalization pressure demand factor is less than the preset demand threshold, the module determines the opening time of the upper equalization valve in the next cycle. When the slow-equalization pressure demand factor is greater than or equal to the preset demand threshold, the lower buffer connecting valve is opened in the equalization stage of the next cycle, using the upper and lower buffer valves to weaken the equalization. In this embodiment, by adjusting the opening and closing of the valves, the temperature inside the dual towers of the oxygen concentrator is prevented from rising, reducing the impact of temperature on the adsorption efficiency of the zeolite molecular sieve, maintaining the concentration of oxygen produced by the oxygen concentrator, and achieving pre-compensation for oxygen concentration.

[0090] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An oxygen generator with oxygen output concentration monitoring and pre-compensation functions, characterized in that, The oxygen generator includes a lower buffer valve, a lower buffer connecting valve, an upper buffer valve, tower A, tower B, a data acquisition module, a data processing module, and a regulating module. The lower buffer valve is connected to the lower buffer connecting valve at one end of a pipeline and to the gas inlet of tower B at the other end. The lower buffer connecting valve is connected to the lower buffer valve at one end of a pipeline and to the gas inlet of tower A at the other end. The upper buffer valve is connected to the gas outlet of tower A at one end of a pipeline and to the gas outlet of tower B at the other end. The regulating module is connected to each valve to control the opening and closing of the valve. The data acquisition module is used to collect pressure data and oxygen concentration at the outlet of the oxygen concentrator; The data processing module is used to obtain the high pressure level of each cycle based on the distribution characteristics of the pressure data at the outlet and the change characteristics of the oxygen concentration in each cycle of oxygen exhaust. Based on the relative change in the high pressure level between each cycle and the previous cycle, the duration of high pressure and the current compensation demand are determined; based on the current compensation demand and the duration of the high pressure duration, the pressure easing demand factor is obtained. The adjustment module is used to determine the opening time of the upper pressure equalization valve in the next cycle if the pressure equalization demand factor is less than the preset demand threshold. If the pressure equalization demand factor is greater than or equal to the preset demand threshold, the lower buffer valve is opened in the pressure equalization stage of the next cycle, and the pressure equalization is weakened by using the upper and lower buffer valves.

2. The oxygen generator with oxygen output concentration monitoring and pre-compensation function according to claim 1, characterized in that, The periodicity of each loop includes: For any given iteration: Calculate the pressure increment between any two adjacent moments in any given cycle; The first of two adjacent moments corresponding to the first negative value of the pressure increment is used as the dividing point to divide any one cycle into the first cycle and the second cycle.

3. The oxygen generator with oxygen output concentration monitoring and pre-compensation function according to claim 2, characterized in that, The method of obtaining the high pressure level for each cycle based on the distribution characteristics of pressure data at the outlet and the variation characteristics of oxygen concentration in each cycle of oxygen discharge includes: For any given iteration: For any given period, the ratio of the maximum pressure value within that period to the duration of the same period is taken as the pressure high-pressure coefficient for that period. A curve is fitted to the oxygen concentration at all times within that period to obtain a fitted curve. The first and last points of the fitted curve are connected by a straight line to obtain the slope of the straight line. The negative correlation mapping value of the slope is taken as the concentration high-pressure coefficient for that period. By combining the high-pressure coefficients and high-pressure concentration coefficients of all cycles in any given cycle, the high-pressure level of that cycle is obtained.

4. The oxygen generator with oxygen output concentration monitoring and pre-compensation function according to claim 3, characterized in that, The method of obtaining the high pressure level of any given cycle by combining the high pressure coefficients and concentration high pressure coefficients of all cycles in that given cycle includes: For any given period, the product of the pressure high-pressure coefficient and the concentration high-pressure coefficient for that period is denoted as the first characteristic value of that period. The normalized result of the average of the first characteristic values ​​of all cycles in any given cycle is determined as the high pressure level of that given cycle.

5. The oxygen generator with oxygen output concentration monitoring and pre-compensation function according to claim 1, characterized in that, The determination of the high-pressure duration based on the relative change in high-pressure level between each cycle and the previous cycle includes: The loop preceding and adjacent to the current loop is taken as the starting loop. Then, n loops are sequentially selected as reference loops in reverse chronological order. If the average high-pressure level of these n reference loops is less than a preset high-pressure threshold, these n reference loops are considered a high-pressure duration period. If the average high-pressure level of these n reference loops is greater than or equal to the preset high-pressure threshold, n+1 loops are selected as reference loops. When the average high-pressure level of these n+1 reference loops is less than the preset high-pressure threshold, these n+1 reference loops are considered a high-pressure duration period. When the average high-pressure level of these n+1 reference loops is greater than or equal to the preset high-pressure threshold, n+2 loops are selected as reference loops, and so on, until the average high-pressure level of all selected reference loops is less than the preset high-pressure threshold. All selected reference loops are then considered a high-pressure duration period. Where n is the preset quantity.

6. The oxygen generator with oxygen output concentration monitoring and pre-compensation function according to claim 5, characterized in that, The current compensation demand level is obtained, including: The difference between the average high pressure level of all reference cycles and the high pressure level of the current cycle is taken as the current compensation requirement.

7. The oxygen generator with oxygen output concentration monitoring and pre-compensation function according to claim 1, characterized in that, The step of obtaining the pressure easing demand factor based on the current compensation demand level and the duration of the high-pressure period includes: Based on the current compensation demand and the duration of the high-pressure period, the pressure easing demand factor is calculated. Both the current compensation demand and the duration of the high-pressure period are positively correlated with the pressure easing demand factor.

8. The oxygen generator with oxygen output concentration monitoring and pre-compensation function according to claim 7, characterized in that, The step of calculating the pressure easing demand factor based on the current compensation demand level and the duration of the high-pressure period includes: The normalized result of the product of the current compensation demand and the duration of the high-pressure period is determined as the pressure easing demand factor.

9. The oxygen generator with oxygen output concentration monitoring and pre-compensation function according to claim 1, characterized in that, Determine the opening time of the upper equalizing valve in the next cycle, including: The first duration is the result of rounding up the product of half the duration of one cycle and the gradual pressure equalization demand factor. The time corresponding to the first duration in the next cycle is determined as the opening time for the upper pressure equalization valve to be opened in advance in the next cycle.

10. The oxygen generator with oxygen output concentration monitoring and pre-compensation function according to claim 2, characterized in that, The calculation of the pressure increment between any two adjacent moments in any given cycle includes: The difference between the pressure data of the second time step and the pressure data of the first time step in any two adjacent time steps in any given cycle is taken as the pressure increment of the corresponding two adjacent time steps.

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