Oxygen production control method and system for oxygen generator

Abstract

The invention provides an oxygen generation control method and system for an oxygen generator, and belongs to the technical field of oxygen generators. The method can pressurize the molecular sieve cylinder in a sampling period and obtain a real-time pressure value of the molecular sieve cylinder; obtaining a first pressurization duration when the real-time pressure value of the molecular sieve cylinder reaches a preset pressure threshold value; and judging whether the first pressurization duration exceeds a preset pressurization duration threshold interval or not, and evaluating whether the operation parameters of the oxygen generator are compensated or not according to a judgment conclusion. By means of the method, the technical problems that an oxygen generation control mode of an existing oxygen generator lacks flexibility, and the running state of the oxygen generator is difficult to monitor and dynamically adjust in real time are solved, and the effects of flexibly controlling the oxygen generator and enabling the oxygen generator to generate oxygen stably are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of oxygen concentrators, and in particular to an oxygen production control method and system for oxygen concentrators. Background Art

[0002] In the actual application of oxygen concentrators, there are many factors that may affect their performance and stability. For example, the pressure change of the molecular sieve cartridge directly affects the efficiency and quality of oxygen production; the speed of the compressor determines the pressurization speed and energy consumption; and the oxygen concentration is an important indicator for measuring the performance of the oxygen concentrator. Traditional oxygen concentrator control is often based on fixed parameter settings, lacks the ability to dynamically adjust, and is difficult to cope with changes in different usage environments and altitudes.

[0003] In addition, the oxygen concentrator may encounter various faults during operation, such as low oxygen concentration, compressor abnormality, etc. If these faults are not discovered and handled in time, they will not only affect the performance and life of the oxygen concentrator, but also may cause safety hazards to users. Therefore, a technical solution is needed that can monitor and dynamically adjust the operating status of the oxygen concentrator in real time to improve its performance and stability and reduce the failure rate. Summary of the invention

[0004] The embodiments of the present application provide an oxygen production control method and system for an oxygen concentrator, which are used to solve the technical problems that the current oxygen production control method of the oxygen concentrator lacks flexibility and is difficult to monitor and dynamically adjust the operating status of the oxygen concentrator in real time.

[0005] On the one hand, an embodiment of the present application provides an oxygen production control method for an oxygen concentrator, the method comprising:

[0006] Step 1: pressurize the molecular sieve cartridge during the sampling period and obtain the real-time pressure value of the molecular sieve cartridge;

[0007] Step 2: Obtain the first pressurization time when the real-time pressure value of the molecular sieve cartridge reaches a preset pressure threshold;

[0008] Step 3: Determine whether the first pressurization time exceeds a preset pressurization time threshold interval, and evaluate whether to compensate for the operating parameters of the oxygen concentrator based on the judgment conclusion.

[0009] In one implementation of the present application, step 3 of evaluating whether to compensate for the operating parameters of the oxygen concentrator includes:

[0010] Step 3.1: If the first pressurization time is within the preset pressurization time threshold interval, the compressor speed is not adjusted during the compensation period;

[0011] Step 3.2: If the first pressurization duration is not within the preset pressurization duration threshold interval, a corresponding compressor compensation speed value is determined based on a preset compressor speed compensation algorithm to adjust the compressor speed of the compensation period according to the compressor compensation speed value.

[0012] In one implementation of the present application, step 3 further includes determining whether the compressor compensation speed value exceeds a preset speed threshold;

[0013] If the compressor compensation speed value is within the preset speed threshold range, the compressor compensation speed value is used as the compressor speed of the compensation period;

[0014] If the compressor compensation speed value is not within the preset speed threshold interval, the boundary speed value of the preset speed threshold interval is used as the compressor speed of the compensation period; wherein the boundary speed value of the preset speed threshold interval is a speed threshold adjacent to the compressor compensation speed value.

[0015] In one implementation of the present application, step 3 further includes, if the compressor compensation speed value is not within the preset speed threshold interval, taking the boundary speed value of the preset speed threshold interval as the compressor speed of the compensation period, calculating the pressurization compensation time under the compressor speed, and determining whether the pressurization compensation time is within the preset pressurization time threshold interval;

[0016] If yes, the compensation period uses the pressurization compensation duration as the second pressurization duration;

[0017] If not, the compensation cycle uses the boundary duration of the preset pressurization duration threshold interval as the second pressurization duration, wherein the boundary duration of the preset pressurization duration threshold interval is the duration threshold adjacent to the pressurization compensation duration.

[0018] In one implementation of the present application, after compensating the operating parameters of the oxygen concentrator, it also includes: after judging whether the pressurization compensation time is within the preset pressurization time threshold interval, based on the oxygen concentration of oxygen production and the preset oxygen concentration threshold, determining whether the oxygen concentrator is operating normally so as to generate concentration alarm information and / or compressor failure alarm information.

[0019] In one implementation of the present application, after determining that the pressurization compensation time is within the preset pressurization time threshold interval, determining whether the corresponding oxygen concentration of oxygen production is greater than a first concentration threshold;

[0020] If yes, control the oxygen concentrator to continue to operate the next pressurization cycle with current parameters;

[0021] Otherwise, the pressurization duration of the next pressurization cycle is corrected until the corresponding oxygen concentration of the oxygen production is greater than the first concentration threshold or the pressurization duration of the next pressurization cycle is not within the preset pressurization duration threshold interval.

[0022] In one implementation of the present application, after determining that the pressurization compensation time is not within the preset pressurization time threshold interval, determining whether the corresponding oxygen concentration of oxygen production is greater than a first concentration threshold;

[0023] If yes, control the oxygen concentrator to continue to operate the next pressurization cycle with current parameters;

[0024] If not, determine whether the corresponding oxygen concentration of oxygen production is greater than a second concentration threshold, and if not, output concentration alarm information, wherein the second concentration threshold is less than the first concentration threshold.

[0025] In one implementation of the present application, when it is determined that the corresponding oxygen concentration of oxygen production is greater than the first concentration threshold, the oxygen concentrator is controlled to continue to execute the operation of the next pressurization cycle with the current parameters, and it is determined whether the corresponding oxygen concentration of oxygen production is greater than the second concentration threshold. If so, the oxygen concentrator is controlled to continue to execute the operation of the next pressurization cycle with the current parameters, and if not, a concentration alarm message is output;

[0026] When it is determined that the corresponding oxygen concentration of oxygen production is not greater than the first concentration threshold, the compressor compensation is stopped, and it is determined whether the corresponding oxygen concentration of oxygen production is greater than the second concentration threshold. If so, the oxygen generator is controlled to continue to execute the next pressurization cycle with the current parameters. If not, the concentration alarm information and the compressor failure alarm information are output.

[0027] In one implementation of the present application, when the first pressurization duration is within the preset pressurization duration threshold interval, based on the oxygen concentration of the oxygen generator and the preset oxygen concentration threshold, it is determined whether the oxygen generator is operating normally so as to generate concentration alarm information and / or compressor failure alarm information.

[0028] In one implementation of the present application, the oxygen concentrator includes multiple user-selectable gears, and each gear includes one or more corresponding thresholds of a preset pressure threshold, a preset time threshold, a preset speed threshold, a preset oxygen concentration threshold, and a preset flow threshold.

[0029] In one implementation of the present application, obtaining the first pressurization time for the real-time pressure value of the molecular sieve cartridge to reach a preset pressure threshold specifically includes:

[0030] The start time of pressurization is the opening time of the pressurization control valve that controls the air inlet of the molecular sieve cartridge and the air outlet of the compressor, and the pressure value of the molecular sieve cartridge from the pressure sensor is obtained in real time to control the compressor to continuously pressurize; wherein, the pressure sensor is arranged at the air inlet of the molecular sieve cartridge;

[0031] Comparing the molecular sieve cartridge pressure value determined in real time with the preset pressure threshold;

[0032] When the pressure value of the molecular sieve cartridge reaches the preset pressure threshold, the corresponding pressurization moment is determined as the pressurization stop moment, so as to determine the first pressurization duration according to the pressurization start moment and the pressurization stop moment.

[0033] On the other hand, the embodiment of the present application further provides an oxygen production control system for an oxygen concentrator, the system comprising: a compressor module, a control valve module, a pressure sensor, a molecular sieve cartridge, an oxygen concentration sensor, a control module, and an oxygen outlet;

[0034] The compressor module is connected to the control module and the control valve module respectively, and is used to compress the external air and output it to the molecular sieve cylinder of the oxygen generator under the control of the control module;

[0035] The control valve module is connected to the control module and the air inlet of the molecular sieve cartridge, respectively, and is used to connect or close the channel between the air outlet of the compressor module and the air inlet of the molecular sieve cartridge under the control of the control module;

[0036] The pressure sensor is arranged at the air inlet of the molecular sieve cartridge and connected to the control module, and is used to collect the pressure value of the molecular sieve cartridge and send it to the control module;

[0037] The molecular sieve cartridge is used to adsorb and remove nitrogen from compressed air under pressurized conditions;

[0038] The oxygen concentration sensor is arranged at the oxygen outlet of the oxygen concentrator and connected to the control module, and is used to collect the oxygen concentration of the oxygen concentrator and send it to the control module.

[0039] The control module is used to execute the above-mentioned oxygen production control method for an oxygen concentrator;

[0040] The oxygen outlet is used to output the oxygen produced to the user.

[0041] Compared with the prior art, the present invention has the following significant effects:

[0042] Through the above technical solution, the pressurization process of the molecular sieve cartridge can be accurately controlled, and the feedback adjustment of the oxygen concentrator can be timely performed according to the pressurization time of the molecular sieve cartridge. At the same time, this application can monitor the oxygen concentrator in real time, which can effectively improve the flexibility of the oxygen production control method of the oxygen concentrator. By dynamically adjusting the operating state of the oxygen concentrator, the efficiency and stability of the oxygen production process are ensured, and the goals of real-time monitoring and dynamic adjustment are effectively achieved, providing strong support for the optimized operation of the oxygen concentrator. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0044] Figure 1 A schematic flow chart of an oxygen production control method for an oxygen concentrator in an embodiment of the present application;

[0045] Figure 2 Another schematic flow chart of an oxygen production control method for an oxygen concentrator in an embodiment of the present application;

[0046] Figure 3 This is a schematic diagram of an overall flow chart of an oxygen production control method for an oxygen concentrator in an embodiment of the present application;

[0047] Figure 4 This is a structural schematic diagram of an oxygen production control system for an oxygen concentrator in an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0049] The embodiments of the present application provide an oxygen production control method and system for an oxygen concentrator, which are used to solve the technical problems that the current oxygen production control method of the oxygen concentrator lacks flexibility and is difficult to monitor and dynamically adjust the operating status of the oxygen concentrator in real time.

[0050] The following describes in detail various embodiments of the present application in conjunction with the accompanying drawings.

[0051] The present application embodiment provides an oxygen production control method for an oxygen concentrator, such as Figure 1 As shown, the method may include the following steps:

[0052] Step 1: During the sampling period, the molecular sieve cartridge is pressurized and the real-time pressure value of the molecular sieve cartridge is obtained.

[0053] Step 2: Obtain the first pressurization time when the real-time pressure value of the molecular sieve cartridge reaches a preset pressure threshold.

[0054] Step 3: Determine whether the first pressurization time exceeds a preset pressurization time threshold interval, and evaluate whether to compensate for the operating parameters of the oxygen concentrator based on the judgment conclusion.

[0055] It should be noted that the execution subject of the above oxygen production control method for an oxygen concentrator may be a microcontroller of the oxygen concentrator, such as a microcontroller unit (MCU), or other controllers capable of sending control instructions, receiving data from a pressure sensor and an oxygen concentration sensor in the oxygen concentrator, and controlling a control valve and a compressor of the oxygen concentrator, which is not specifically limited in this application. For the convenience of description, this application takes the microcontroller in the oxygen concentrator as the execution subject and describes the steps of the above oxygen production control method for an oxygen concentrator.

[0056] In an embodiment of the present application, the sampling period may be the time period before the compensation period during which the molecular sieve cylinder is pressurized so that the internal pressure of the molecular sieve cylinder continues to rise. The compensation period may be a period during which the molecular sieve cylinder is pressurized with the compensated operating parameters after the operating parameters of the oxygen generator are compensated, which is affected by the sampling period. Among them, the sampling period may be adjacent to the compensation period, or there may be multiple pressurization periods between the sampling period and the compensation period, or there may be a compensation period after multiple sampling periods. Different settings may be selected according to the actual usage scenario, and this application does not specifically limit this.

[0057] Specifically, the microcontroller sends a control command to the compressor inside the oxygen concentrator to make the compressor run, and at the same time controls the opening of the internal pressure control valve of the oxygen concentrator. The pressure control valve is arranged between the air outlet of the compressor and the air inlet of the molecular sieve cartridge, so that the pressurized air continuously enters the molecular sieve cartridge, and the pressure inside the molecular sieve cartridge continuously increases. The pressure sensor arranged at the air inlet of the molecular sieve cartridge collects the real-time pressure value of the molecular sieve cartridge and sends it to the microcontroller.

[0058] In one embodiment of the present application, the first pressurization time for obtaining the real-time pressure value of the molecular sieve cartridge to reach a preset pressure threshold specifically includes:

[0059] The opening moment of the pressurization control valve that controls the air inlet of the molecular sieve cartridge and the air outlet of the compressor is taken as the pressurization start moment, and the molecular sieve cartridge pressure value from the pressure sensor is obtained in real time and the compressor is controlled to continue pressurization. Among them, the pressure sensor is set at the air inlet of the molecular sieve cartridge. The real-time determined molecular sieve cartridge pressure value is compared with the preset pressure threshold. When the molecular sieve cartridge pressure value reaches the preset pressure threshold, the corresponding pressurization moment is determined as the pressurization stop moment, so as to determine the first pressurization duration according to the pressurization start moment and the pressurization stop moment.

[0060] In other words, the microcontroller can time the pressurization process and use the current preset pressure threshold to compare with the molecular sieve cylinder pressure value. Once the molecular sieve cylinder pressure value is greater than or equal to the preset pressure threshold, it means that the pressurization condition is met. At this time, the microcontroller controls the oxygen generator to stop pressurizing the molecular sieve cylinder and stops timing to obtain the first pressurization duration.

[0061] In addition, the preset pressure threshold of the oxygen concentrator can be different in different gears, and the microcontroller can determine the preset pressure threshold corresponding to the current gear, and then perform the above comparison step. The preset pressure threshold is set according to the actual use scenario and / or oxygen concentrator parameters, and this application does not make specific limitations on this.

[0062] In one embodiment of the present application, step 3 evaluates whether to compensate for the operating parameters of the oxygen concentrator, such as Figure 2 As shown, the following steps are included:

[0063] Step 3.1: If the first pressurization duration is within a preset pressurization duration threshold interval, the compressor speed is not adjusted during the compensation period.

[0064] Step 3.2: If the first pressurization duration is not within the preset pressurization duration threshold interval, a corresponding compressor compensation speed value is determined based on a preset compressor speed compensation algorithm to adjust the compressor speed of the compensation period according to the compressor compensation speed value.

[0065] Figure 3 This is a schematic diagram of the overall process of an oxygen production control method for an oxygen concentrator, refer to Figure 3 When the microcontroller determines that the first pressurization duration is within the preset pressurization duration threshold range, it means that the oxygen concentrator is in normal operation, and it is not necessary to compensate the operating parameters for the subsequent compensation cycle. The compressor speed is not adjusted in the subsequent compensation cycle, and the current operating parameters are maintained.

[0066] The oxygen concentrator of the present application may correspond to different preset pressurization time threshold intervals at different operating gears. The preset pressurization time threshold interval may be set according to the actual use conditions, and the present application does not make specific restrictions on this. The preset pressurization time threshold interval is, for example, [t1, t2], where t1 is the minimum boundary time and t2 is the maximum boundary time.

[0067] In another embodiment of the present application, when the first pressurization time is within a preset pressurization time threshold interval, it is determined whether the oxygen generator is operating normally based on the oxygen concentration of the oxygen generator and the preset oxygen concentration threshold so as to generate concentration alarm information and / or compressor failure alarm information.

[0068] That is to say, the microcontroller can also obtain the oxygen concentration of oxygen production in real time through the oxygen concentration sensor arranged after the molecular sieve cylinder, and compare the oxygen concentration of oxygen production with the preset oxygen concentration threshold, so as to determine whether the oxygen generator is operating normally according to the comparison result so as to generate concentration alarm information and / or compressor failure alarm information.

[0069] Among them, the preset oxygen concentration threshold may include a first concentration threshold and a second concentration threshold, the first concentration threshold is greater than the second concentration threshold, the second concentration threshold may be understood as a required lower limit of oxygen concentration, such as 82%, the first concentration threshold may be understood as a lower limit of oxygen concentration for triggering compensation, such as 90%, the first concentration threshold and the second concentration threshold may be set according to actual needs, and are not specifically limited here.

[0070] Specifically, when the oxygen concentration of the oxygen generator is greater than the first concentration threshold, the current operating parameters are continued to be maintained to operate the compressor, and it is continued to be evaluated whether the operating parameters of the oxygen generator are compensated in the future; when the oxygen concentration of the oxygen generator is greater than the second concentration threshold and is less than or equal to the first concentration threshold, it means that the compressor speed has been compensated, and the compressor speed has reached the compensable speed boundary value, and the pressurization time has reached the boundary time, that is, the compensable limit condition has been reached. Under this condition, the compressor can only continue to operate with the current operating parameters for a period of time, and further determine whether to issue a concentration alarm message and / or a compressor fault alarm based on a subsequent preset detection time, such as the change in oxygen concentration of the oxygen generator within one hour; when the oxygen concentration of the oxygen generator is less than or equal to the second concentration threshold, the concentration alarm message and the compressor fault alarm message can be output at this time.

[0071] Furthermore, when the oxygen concentration of the oxygen generator is greater than the second concentration threshold and less than or equal to the first concentration threshold, the compressor continues to be operated with the current operation parameters maintained, and before the low concentration alarm message is issued, after monitoring one or more consecutive pressurization cycles to maintain the condition that the oxygen concentration of the oxygen generator is greater than the second concentration threshold and less than or equal to the first concentration threshold, it is possible to continue to evaluate whether the operating parameters of the oxygen generator can be compensated, and if compensation is possible, continue to compensate for the compressor speed, that is, the execution of the relevant algorithm flow for compressor compensation will not be stopped at this time. When the oxygen concentration of the oxygen generator is less than or equal to the second concentration threshold, the operation of the next pressurization cycle can also be executed with the current operating parameters, and the compressor compensation can be stopped. After monitoring one or more consecutive pressurization cycles to maintain the condition that the oxygen concentration of the oxygen generator is less than or equal to the second concentration threshold, the concentration alarm message and the compressor failure alarm message can be output.

[0072] In an embodiment of the present application, when the first pressurization duration is not within the preset pressurization duration threshold range, the microcontroller will execute the compressor compensation step, and adjust the first pressurization duration to within the preset pressurization duration threshold range through the preset compressor speed compensation algorithm. The compressor speed at this time is the compressor compensation speed value.

[0073] In one embodiment of the present application, the compressor compensation speed value is calculated by the following embodiment:

[0074] The microcontroller uses the above-mentioned maximum boundary time and minimum boundary time as the first pressurization time to be adjusted and the second pressurization time to be adjusted, respectively. Based on the division operation of the preset pressure threshold, the preset pressurization coefficient, and the first pressurization time to be adjusted, the first parameter is determined; the difference between the first parameter and the second parameter is used as the third parameter; wherein the second parameter is obtained based on the first product value of the output gas volume of the preset molecular sieve cylinder per unit time and the preset molecular sieve cylinder gas density; the division calculation result of the third parameter and the fourth parameter is determined as the first compressor compensation speed value; wherein the fourth parameter is obtained based on the second product value of the air volume inhaled per unit number of revolutions of the compressor and the preset external air density. Similarly, the second compressor compensation speed value is calculated according to the second pressurization time to be adjusted. The compensation speed values ​​including the first compressor compensation speed value and the second compressor compensation speed value and the compensation speed values ​​between the two can all be used as the compressor compensation speed value. In actual use, a selection rule can be set to select any compensation speed value as the compressor compensation speed value.

[0075] The formula for calculating the compressor compensation speed value is as follows:

[0076]

[0077] Among them, r is the compressor compensation speed value, P set is the preset pressure threshold, 2×K is the preset pressure coefficient, t is the pressure duration to be adjusted, V c is the preset molecular sieve cylinder output gas volume per unit time (related to the gear position of the oxygen generator); ρ c V is the preset gas density value at the oxygen outlet, which is related to the oxygen outlet pressure; a is the volume of air sucked in per unit number of revolutions of the compressor, ρ a is the preset outside air density. is the first parameter, V c ×ρ c is the second parameter, is the third parameter, V a ×ρ a is the fourth parameter, R is the universal gas constant, T is the current gas temperature in the molecular sieve cylinder, M is the molar mass, V bThe above parameters can be obtained by sensors disposed inside and / or outside the oxygen concentrator and oxygen concentrator specification parameters pre-stored in the microcontroller, and the present application does not make specific limitations on this.

[0078] In one embodiment of the present application, the above step 3 further includes determining whether the compressor compensation speed value exceeds a preset speed threshold. If the compressor compensation speed value is within the preset speed threshold interval, the compressor compensation speed value is used as the compressor speed of the compensation period; if the compressor compensation speed value is not within the preset speed threshold interval, the boundary speed value of the preset speed threshold interval is used as the compressor speed of the compensation period. The boundary speed value of the preset speed threshold interval is a speed threshold adjacent to the compressor compensation speed value.

[0079] In other words, if the compressor compensation speed value is within the preset speed threshold range, it means that the compensation is achievable. At this time, the microcontroller will control the rotation of the compressor motor with the compressor compensation speed value during the compensation period. If the compressor compensation speed value is not within the preset speed threshold range, it means that it exceeds the compensable range of the compressor. At this time, the speed threshold closest to the compressor compensation speed value will be used as the compressor speed of the compensation period.

[0080] Among them, the boundary speed value is preset as the speed threshold interval [r1, r2]. If the compressor compensation speed value is less than r1, the speed threshold that is closer to the compressor compensation speed value is r1. If the compressor compensation speed value is greater than r2, the speed threshold that is closer to the compressor compensation speed value is r2.

[0081] In another embodiment of the present application, the above step 3 also includes: if the compressor compensation speed value is not in the preset speed threshold interval, then the boundary speed value of the preset speed threshold interval is used as the compressor speed of the compensation cycle, and the pressurization compensation duration under the compressor speed is calculated, and it is determined whether the pressurization compensation duration is in the preset pressurization duration threshold interval. If it is determined that the pressurization compensation duration is in the preset pressurization duration threshold interval, the compensation cycle uses the pressurization compensation duration as the second pressurization duration. If it is determined that the pressurization compensation duration is not in the preset pressurization duration threshold interval, the compensation cycle uses the boundary duration of the preset pressurization duration threshold interval as the second pressurization duration, wherein the boundary duration of the preset pressurization duration threshold interval is a duration threshold adjacent to the pressurization compensation duration.

[0082] That is to say, after obtaining that the compressor compensation speed value is not within the preset speed threshold interval, the microcontroller will further calculate the pressurization compensation duration with the boundary speed value, so as to further determine whether the pressurization compensation duration is within the preset pressurization duration threshold interval. Among them, if the pressurization compensation duration is not within the preset pressurization duration threshold interval, then the compensation cycle uses the duration threshold value closest to the pressurization compensation duration as the second pressurization duration. This selection method can refer to the above-mentioned embodiment of using the speed threshold value closest to the compressor compensation speed value as the compressor speed of the compensation cycle, which will not be repeated here.

[0083] In another embodiment of the present application, the above-mentioned compensation for the operating parameters of the oxygen concentrator also includes: after judging whether the pressurization compensation time is in the preset pressurization time threshold interval, based on the oxygen concentration of the oxygen concentrator and the preset oxygen concentration threshold, determining whether the oxygen concentrator is operating normally so as to generate concentration alarm information and / or compressor failure alarm information.

[0084] That is, after determining whether the pressurization compensation time is within the preset pressurization time threshold interval, it will be further determined whether the oxygen concentrator is operating normally based on the oxygen concentration of the oxygen generator. Here, based on the oxygen concentration of the oxygen generator and the preset oxygen concentration threshold, it is determined whether the oxygen concentrator is operating normally in order to generate concentration alarm information and / or compressor failure alarm information. Please refer to the above embodiment and will not repeat it here.

[0085] In the embodiment of the present application, when the boundary speed value of the preset speed threshold interval is used as the compressor speed of the compensation cycle, after determining that the pressurization compensation time is within the preset pressurization time threshold interval, determine whether the corresponding oxygen concentration of oxygen production is greater than the first concentration threshold. If it is determined that the corresponding oxygen concentration of oxygen production is greater than the first concentration threshold, control the oxygen generator to continue to execute the next pressurization cycle with the current parameters; otherwise, correct the pressurization time of the next pressurization cycle until the corresponding oxygen concentration of oxygen production is greater than the first concentration threshold or the pressurization time of the next pressurization cycle is not within the preset pressurization time threshold interval.

[0086] That is to say, when the pressurization compensation time is in the preset pressurization time threshold interval, the microcontroller can compare the oxygen concentration of the oxygen generator with the first concentration threshold, wherein, if the oxygen concentration of the oxygen generator is less than or equal to the first concentration threshold, the oxygen generator needs to correct the pressurization time in the subsequent pressurization cycle, and the corrected pressurization time includes increasing the pressurization time and reducing the pressurization time. If the oxygen concentration of the oxygen generator in the subsequent pressurization cycle is greater than the first concentration threshold, the oxygen generator is controlled to continue to execute the next pressurization cycle with the current parameters; if the pressurization time of the subsequent pressurization cycle is not in the preset pressurization time threshold interval, the microcontroller will use the boundary time of the preset pressurization time threshold interval as the pressurization time of the subsequent pressurization cycle.

[0087] In the embodiment of the present application, after determining that the pressurization compensation time is not within the preset pressurization time threshold interval, determine whether the corresponding oxygen concentration of oxygen production is greater than the first concentration threshold. If it is determined that the corresponding oxygen concentration of oxygen production is greater than the first concentration threshold, control the oxygen concentrator to continue to execute the next pressurization cycle with the current parameters. If it is determined that the corresponding oxygen concentration of oxygen production is not greater than the first concentration threshold, determine whether the corresponding oxygen concentration of oxygen production is greater than the second concentration threshold. If it is determined that the corresponding oxygen concentration of oxygen production is not greater than the second concentration threshold, output concentration alarm information, wherein the second concentration threshold is less than the first concentration threshold.

[0088] In other words, when the compressor is operated at the boundary speed value and the boundary time is used as the second pressurization time, the microcontroller will continue to determine whether the oxygen concentration of the oxygen concentrator is greater than the first concentration threshold under this operating state. If it is greater than the first concentration threshold, the operation of the oxygen concentrator can still be controlled with the current parameters, i.e., the boundary speed value and the boundary time. When it is not greater than the first concentration threshold, the oxygen concentration of the oxygen concentrator will be further compared with the second concentration threshold. Once the oxygen concentration of the oxygen concentrator is not greater than the second concentration threshold, the oxygen concentrator will be controlled to issue a concentration alarm message, and the concentration alarm message includes but is not limited to a sound signal and a light signal.

[0089] In one embodiment of the present application, when it is determined that the corresponding oxygen concentration of oxygen production is greater than the first concentration threshold, the oxygen concentrator is controlled to continue to execute the operation of the next pressurization cycle with the current parameters, and it is determined whether the corresponding oxygen concentration of oxygen production is greater than the second concentration threshold. If so, the oxygen concentrator is controlled to continue to execute the operation of the next pressurization cycle with the current parameters. If not, a concentration alarm message is output. When it is determined that the corresponding oxygen concentration of oxygen production is not greater than the first concentration threshold, and the compressor speed has been compensated at this time, and the compressor speed has reached the compensable speed boundary value, the compressor is stopped from being compensated, and it is determined whether the corresponding oxygen concentration of oxygen production is greater than the second concentration threshold. If so, the oxygen concentrator is controlled to continue to execute the operation of the next pressurization cycle with the current parameters. If not, a concentration alarm message and a compressor failure alarm message are output.

[0090] That is, when the oxygen concentrator is operated under the above conditions: the compressor is operated at the boundary speed value and the boundary time is used as the second pressurization time, if the oxygen concentration of the oxygen concentrator is greater than the first concentration threshold at the beginning (the first time it is operated under the condition), the microcontroller can operate the oxygen concentrator under the above conditions within a subsequent preset detection time, such as 1 hour, and continuously compare the oxygen concentration of the oxygen concentrator with the first concentration threshold within the 1 hour and record the comparison result. During this period, the oxygen concentrator is also controlled to run the subsequent pressurization cycle with the current parameters or output the concentration alarm information according to the comparison result of the oxygen concentration of the oxygen concentrator with the second concentration threshold. If the oxygen concentration of the oxygen concentrator is still greater than the first concentration threshold within the above preset detection time, i.e. within 1 hour, the step of compensating the compressor is maintained.

[0091] If within the above preset detection time, i.e., within 1 hour, the oxygen concentration of the oxygen generator is no longer greater than the first concentration threshold, and the above conditions are met: the compressor is operated at the boundary speed value and the boundary time is used as the second pressurization time for the oxygen generator to operate, the compressor speed has been compensated at this time, and the compressor speed has reached the compensable speed boundary value. At this time, the oxygen generator will stop compensating the compressor, and at the same time, based on the comparison result of the oxygen concentration of the oxygen generator with the second concentration threshold, execute the subsequent steps of controlling the oxygen generator to operate the subsequent pressurization cycle with the current parameters or outputting concentration alarm information and compressor failure alarm information.

[0092] It should be noted that in actual applications, when the pressurization time reaches the limit and the compressor speed reaches the limit, the detection time is 1 hour. If the concentration is still above the first concentration threshold, it means that the compressor gas output is normal, but because the environment has changed, the oxygen production system has to work under extreme conditions. However, if the oxygen concentration drops rapidly in less than an hour, it is obviously a compressor failure, that is, the gas output is still insufficient under extreme conditions. At this time, it is meaningless to compensate, which will only accelerate the aging of the compressor. Therefore, as long as it operates in this state, wait for the alarm to sound when the oxygen concentration of the oxygen production is lower than the second concentration threshold.

[0093] In one embodiment of the present application, the oxygen concentrator includes multiple user-selectable gears, and each gear includes one or more thresholds selected from a corresponding preset pressure threshold, a preset time threshold, a preset speed threshold, a preset oxygen concentration threshold, and a preset flow threshold.

[0094] That is to say, the oxygen concentrator has different preset pressure thresholds, preset time thresholds, preset speed thresholds, preset oxygen concentration thresholds and / or preset flow thresholds under different user-selectable gears. The microcontroller can use the thresholds corresponding to the gears to execute the above-mentioned oxygen production control method for the oxygen concentrator according to the gear selected by the user. The specific thresholds can be set during actual use, and this application does not make specific limitations on this.

[0095] Through the above technical solution, the pressurization process of the molecular sieve cartridge can be accurately controlled, and the feedback adjustment of the oxygen concentrator can be timely performed according to the pressurization time of the molecular sieve cartridge. At the same time, this application can monitor the oxygen concentrator in real time, which can effectively improve the flexibility of the oxygen production control method of the oxygen concentrator. By dynamically adjusting the operating state of the oxygen concentrator, the efficiency and stability of the oxygen production process are ensured, and the goals of real-time monitoring and dynamic adjustment are effectively achieved, providing strong support for the optimized operation of the oxygen concentrator.

[0096] Figure 4 A schematic diagram of the structure of an oxygen production control system for an oxygen concentrator provided in an embodiment of the present application is shown in FIG. Figure 4As shown, an oxygen production control system 400 for an oxygen concentrator includes: a compressor module 401, a control valve module 402, a pressure sensor 403, a molecular sieve cartridge 404, an oxygen concentration sensor 405, a control module 406, and an oxygen outlet 407. The dotted line indicates that the two are not directly connected, and there are other connecting components between them.

[0097] The compressor module 401 is connected to the control module 406 and the control valve module 402 respectively, and is used to compress the external air and output it to the molecular sieve cylinder 404 of the oxygen concentrator under the control of the control module 406. The control valve module 402 is connected to the control module 406 and the air inlet of the molecular sieve cylinder 404 respectively, and is used to connect or close the channel between the air outlet of the compressor module 401 and the air inlet of the molecular sieve cylinder 404 under the control of the control module 406. The pressure sensor 403 is arranged at the air inlet of the molecular sieve cylinder 404 and connected to the control module 406, and is used to collect the pressure value of the molecular sieve cylinder and send it to the control module 406. The molecular sieve cylinder 404 is used to adsorb and remove nitrogen from the compressed air under pressurized state. The oxygen concentration sensor 405 is arranged at the oxygen outlet 407 of the oxygen concentrator and connected to the control module 406, and is used to collect the oxygen concentration of oxygen production and send it to the control module 406, and the control module is used to execute the above-mentioned oxygen production control method for an oxygen concentrator. The oxygen outlet 407 is used to output the oxygen produced to the user.

[0098] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0099] The system and method provided in the embodiment of the present application correspond one to one, and therefore the system also has similar beneficial technical effects as its corresponding method. Since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the system will not be repeated here.

[0100] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0101] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An oxygen production control method for an oxygen concentrator, characterized in that: The method comprises: Step 1: pressurize the molecular sieve cartridge during the sampling period and obtain the real-time pressure value of the molecular sieve cartridge; Step 2: Obtain the first pressurization time when the real-time pressure value of the molecular sieve cartridge reaches a preset pressure threshold; Step 3: Determine whether the first pressurization time exceeds a preset pressurization time threshold interval, and evaluate whether to compensate for the operating parameters of the oxygen concentrator based on the judgment conclusion.

2. The oxygen production control method for an oxygen concentrator according to claim 1, characterized in that: Step 3 evaluates whether to compensate for the oxygen concentrator's operating parameters including: Step 3.1: If the first pressurization time is within the preset pressurization time threshold interval, the compressor speed is not adjusted during the compensation period; Step 3.2: If the first pressurization duration is not within the preset pressurization duration threshold interval, a corresponding compressor compensation speed value is determined based on a preset compressor speed compensation algorithm to adjust the compressor speed of the compensation period according to the compressor compensation speed value.

3. The oxygen production control method for an oxygen concentrator according to claim 2, characterized in that: Step 3 also includes determining whether the compressor compensation speed value exceeds a preset speed threshold; If the compressor compensation speed value is within the preset speed threshold range, the compressor compensation speed value is used as the compressor speed of the compensation period; If the compressor compensation speed value is not within the preset speed threshold interval, the boundary speed value of the preset speed threshold interval is used as the compressor speed of the compensation period; wherein the boundary speed value of the preset speed threshold interval is a speed threshold adjacent to the compressor compensation speed value.

4. The oxygen production control method for an oxygen concentrator according to claim 3, characterized in that: Step 3 also includes, if the compressor compensation speed value is not within the preset speed threshold interval, taking the boundary speed value of the preset speed threshold interval as the compressor speed of the compensation period, calculating the pressurization compensation time under the compressor speed, and determining whether the pressurization compensation time is within the preset pressurization time threshold interval; If yes, the compensation period uses the pressurization compensation duration as the second pressurization duration; If not, the compensation cycle uses the boundary duration of the preset pressurization duration threshold interval as the second pressurization duration, wherein the boundary duration of the preset pressurization duration threshold interval is the duration threshold adjacent to the pressurization compensation duration.

5. The oxygen production control method for an oxygen concentrator according to claim 4, characterized in that: After compensating the operating parameters of the oxygen concentrator, it also includes: after judging whether the pressurization compensation time is within the preset pressurization time threshold interval, based on the oxygen concentration of oxygen production and the preset oxygen concentration threshold, determining whether the oxygen concentrator is operating normally so as to generate concentration alarm information and / or compressor failure alarm information.

6. The oxygen production control method for an oxygen concentrator according to claim 5, characterized in that: After determining that the pressurization compensation time is within the preset pressurization time threshold interval, determining whether the corresponding oxygen concentration of oxygen production is greater than a first concentration threshold; If yes, control the oxygen concentrator to continue to operate the next pressurization cycle with current parameters; Otherwise, the pressurization duration of the next pressurization cycle is corrected until the corresponding oxygen concentration of the oxygen production is greater than the first concentration threshold or the pressurization duration of the next pressurization cycle is not within the preset pressurization duration threshold interval.

7. The oxygen production control method for an oxygen concentrator according to claim 5, characterized in that: After determining that the pressurization compensation time is not within the preset pressurization time threshold interval, determining whether the corresponding oxygen concentration of oxygen production is greater than a first concentration threshold; If yes, control the oxygen concentrator to continue to operate the next pressurization cycle with current parameters; If not, determine whether the corresponding oxygen concentration of oxygen production is greater than a second concentration threshold, and if not, output concentration alarm information, wherein the second concentration threshold is less than the first concentration threshold.

8. The oxygen production control method for an oxygen concentrator according to claim 7, characterized in that: When it is determined that the corresponding oxygen concentration of oxygen production is greater than the first concentration threshold, the oxygen concentrator is controlled to continue to perform the operation of the next pressurization cycle with the current parameters, and it is determined whether the corresponding oxygen concentration of oxygen production is greater than the second concentration threshold. If so, the oxygen concentrator is controlled to continue to perform the operation of the next pressurization cycle with the current parameters, and if not, a concentration alarm message is output; When it is determined that the corresponding oxygen concentration of oxygen production is not greater than the first concentration threshold, the compressor compensation is stopped, and it is determined whether the corresponding oxygen concentration of oxygen production is greater than the second concentration threshold. If so, the oxygen generator is controlled to continue to execute the next pressurization cycle with the current parameters. If not, the concentration alarm information and the compressor failure alarm information are output.

9. The oxygen production control method for an oxygen concentrator according to claim 1, characterized in that: When the first pressurization time is within the preset pressurization time threshold interval, based on the oxygen concentration of the oxygen generator and the preset oxygen concentration threshold, it is determined whether the oxygen generator is operating normally so as to generate concentration alarm information and / or compressor failure alarm information.

10. The oxygen production control method for an oxygen concentrator according to claim 1, characterized in that: The oxygen concentrator includes a plurality of user-selectable gears, each gear including one or more thresholds selected from a corresponding preset pressure threshold, a preset time threshold, a preset speed threshold, a preset oxygen concentration threshold and a preset flow threshold.

11. The oxygen production control method for an oxygen concentrator according to claim 1, characterized in that: Obtaining the first pressurization time for the real-time pressure value of the molecular sieve cartridge to reach a preset pressure threshold, specifically including: The start time of pressurization is the opening time of the pressurization control valve that controls the air inlet of the molecular sieve cartridge and the air outlet of the compressor, and the pressure value of the molecular sieve cartridge from the pressure sensor is obtained in real time to control the compressor to continuously pressurize; wherein, the pressure sensor is arranged at the air inlet of the molecular sieve cartridge; Comparing the molecular sieve cartridge pressure value determined in real time with the preset pressure threshold; When the pressure value of the molecular sieve cartridge reaches the preset pressure threshold, the corresponding pressurization moment is determined as the pressurization stop moment, so as to determine the first pressurization duration according to the pressurization start moment and the pressurization stop moment.

12. An oxygen production control system for an oxygen concentrator, characterized in that: The system comprises: a compressor module, a control valve module, a pressure sensor, a molecular sieve cartridge, an oxygen concentration sensor, a control module, and an oxygen outlet; The compressor module is connected to the control module and the control valve module respectively, and is used to compress the external air and output it to the molecular sieve cylinder of the oxygen generator under the control of the control module; The control valve module is connected to the control module and the air inlet of the molecular sieve cartridge, respectively, and is used to connect or close the channel between the air outlet of the compressor module and the air inlet of the molecular sieve cartridge under the control of the control module; The pressure sensor is arranged at the air inlet of the molecular sieve cartridge and connected to the control module, and is used to collect the pressure value of the molecular sieve cartridge and send it to the control module; The molecular sieve cartridge is used to adsorb and remove nitrogen from compressed air under pressurized conditions; The oxygen concentration sensor is arranged at the oxygen outlet of the oxygen concentrator and connected to the control module, and is used to collect the oxygen concentration of the oxygen concentrator and send it to the control module. The control module is used to execute the oxygen production control method for an oxygen concentrator according to any one of claims 1 to 11 above; The oxygen outlet is used to output the oxygen produced to the user.

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