Intelligent oxygen conveying control system of vertical oxygen generator

Abstract

The invention discloses an intelligent oxygen delivery control system for a vertical oxygen generator, which relates to the technical field of oxygen generator control and comprises a data acquisition module, a flow velocity interval establishment module, an adjustment rate limit value acquisition module, a valve control module, a control delay time acquisition module, a signal sending time acquisition module and a multi-channel cooperative control module. The technical problem that the flow of a gas medium in a pipeline is instantaneously overspeed due to the fact that the adjusting speed of an oxygen conveying valve of the vertical oxygen generator is too high is solved, the valve is correspondingly adjusted according to the real-time flow speed and the adjusting speed limit value, and the danger that the flow of the gas medium in the pipeline is instantaneously overspeed due to the fact that the adjusting speed of the valve is too high is avoided; the safety of gas conveying in different oxygen conveying channels is further improved, the adjustment accuracy of the channel valves is guaranteed by determining the control delay time and calculating the signal sending time, and the oxygen conveying control of the oxygen conveying channels is more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of oxygen concentrator control, and in particular is an intelligent control system for oxygen delivery of a vertical oxygen concentrator. Background Art

[0002] In the production process of heavy industries such as metallurgy, oxygen is a key energy medium, and its stable, efficient and safe delivery is crucial to production continuity and personnel safety. Vertical oxygen concentrators are currently widely used oxygen production equipment. The oxygen they output needs to be delivered to different users or process links through multiple delivery channels. The safety and reliability of the oxygen delivery system of vertical oxygen concentrators directly affects production efficiency and safety.

[0003] However, since oxygen is a combustible and explosive gas, during the transportation process, if the valve is opened and closed too quickly, it is easy to cause the gas medium flow in the pipeline to exceed the speed instantaneously, and the pressure difference before and after the valve group is large, resulting in the risk of explosion in the transportation pipeline. The existing vertical oxygen concentrator oxygen delivery system has deficiencies in valve adjustment rate control, lacks accurate determination of the valve adjustment rate limit under different flow rate ranges, and easily causes the valve adjustment speed to be too fast, causing dangerous situations such as instantaneous overspeed of the gas medium flow in the pipeline, affecting the safety of oxygen delivery. In addition, the control signal delay can also cause a deviation between the valve adjustment action and the target control time, affecting the overall adjustment accuracy and safety of the system, resulting in insufficient adjustment accuracy of the channel valve in the oxygen delivery channel; based on this, an intelligent control system for oxygen delivery in a vertical oxygen concentrator is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent control system for oxygen delivery of a vertical oxygen concentrator, which solves the technical problem that the oxygen delivery system of the vertical oxygen concentrator lacks accurate determination of the valve adjustment rate limit in different flow rate ranges, resulting in excessively fast valve adjustment speed and causing instantaneous overspeed of the gas medium flow in the pipeline.

[0005] An intelligent control system for oxygen delivery of a vertical oxygen concentrator, comprising:

[0006] The data acquisition module obtains the historical gas flow rate of each channel valve, the valve opening and closing time, and the absolute value of the pressure difference of the channel valve at different adjustment rates;

[0007] A flow rate interval establishment module obtains a flow rate state value according to the historical gas flow rate, and establishes multiple flow rate intervals according to the flow rate state value;

[0008] The regulating rate limit acquisition module analyzes the absolute value of the air pressure difference of each channel valve at different regulating rates in different flow rate intervals, and generates the regulating rate limit values ​​corresponding to different channel valves at different flow rate intervals;

[0009] The valve control module controls the regulating rate of the valve of the channel to be regulated according to the regulating rate limit of the flow rate interval corresponding to the real-time flow rate of the valve of the channel to be regulated;

[0010] The control delay time acquisition module analyzes the control signal sending time of each channel valve and the channel valve control time to obtain the control delay time corresponding to different channel valves;

[0011] The signal sending time acquisition module calculates and obtains the signal sending time corresponding to each valve in the channel to be controlled according to the required adjustment completion time, the required adjustment mileage and the control delay time of each valve in the channel to be controlled and the adjustment rate limit corresponding to the real-time flow rate;

[0012] The multi-channel collaborative control module is used to collaboratively calculate the signal sending time of each valve with the same signal sending time according to the geometric distribution type of each valve with the same signal sending time when multiple valves in the channel to be controlled exist at the same time, and then obtain the collaborative signal sending time of each valve with the same signal sending time, and optimize the signal sending time of each valve with the same signal sending time.

[0013] As a further solution of the present invention: multiple historical gas flow rates are obtained, and the gas flow rates with the same numerical value are taken as a flow rate state value, and then multiple flow rate state values ​​are obtained, and different flow rate state values ​​are sorted from left to right according to the numerical value, so that every two adjacent flow rate state values ​​form a flow rate interval, and then multiple flow rate intervals are established.

[0014] As a further solution of the present invention: the specific method of generating the regulating rate limits corresponding to different channel valves in different flow rate intervals is:

[0015] S1: Randomly select one of the different flow rate intervals without replacement as the target interval;

[0016] S2: Randomly select one valve from different channel valves without replacement as the target channel valve;

[0017] Obtain the absolute values ​​EBe of the pressure difference corresponding to the target channel valve at different adjustment rates EAe in the target interval. According to the absolute values ​​EBe of the pressure difference corresponding to the target channel valve at different adjustment rates EAe in the target interval, use the different adjustment rates EAe as the horizontal coordinates and the absolute values ​​EBe of the pressure difference corresponding to the different adjustment rates EAe as the vertical coordinates, thereby obtaining the coordinate points Ee (EAe, EBe) corresponding to the target channel valve at different adjustment rates in the target interval. Then, connect each two adjacent coordinate points in order from left to right to obtain a two-dimensional coordinate curve. Mark the line between each two adjacent coordinate points as a stage line of the two-dimensional coordinate curve. Obtain the slopes corresponding to each stage line according to the coordinates of the two coordinate points constituting each stage line. Obtain the horizontal coordinate value corresponding to the previous coordinate point on the stage line with the maximum slope, and use it as the adjustment rate limit H11 corresponding to the target channel valve in the target interval, wherein e refers to different coordinate points.

[0018] S3: Repeat step S2 to obtain the corresponding adjustment rate limit H1h of different channel valves within the target range;

[0019] S4: Repeat steps S1-S3 to obtain the corresponding regulation rate limit Hrh of different channel valves in different flow rate ranges, where h refers to different channel valves and r refers to different flow rate ranges.

[0020] As a further solution of the present invention: the specific method of obtaining the control delay time lengths corresponding to different channel valves is:

[0021] First, a valve is randomly selected from different channel valves without replacement as the analysis channel valve, and the absolute value of the time difference between the time when the control signal of the analysis channel valve is sent g times and the control time of the channel valve is taken. Then, the average of the maximum and minimum values ​​of the absolute value of the difference is taken as the control delay time CT1 of the analysis channel valve. Finally, the same analysis method is used to analyze the historical control data of the remaining channel valves, and then the control delay time CTh corresponding to different channel valves is obtained, where g is a positive integer and g is greater than 30.

[0022] As a further solution of the present invention: the specific method of calculating and obtaining the signal sending time corresponding to each valve of the channel to be controlled is:

[0023] The required adjustment completion time of each channel valve to be controlled is marked as XTm, and the required adjustment mileage is marked as Rm. The required adjustment mileage Rm corresponding to each channel valve to be controlled is divided by the corresponding adjustment rate limit Vm to obtain the required adjustment time corresponding to each channel valve to be controlled. After adding the required adjustment time of each channel valve to be controlled and the valve control delay time Wm, the difference between the required adjustment completion time XTm corresponding to each channel valve to be controlled and the valve control delay time Wm is used as the signal sending time FTm corresponding to each channel valve to be controlled, where m is a different channel valve to be controlled;

[0024] As a further solution of the present invention: the specific method for obtaining the coordinated signal sending time of each valve having the same signal sending time is:

[0025] When the geometric distribution type of valves with the same signal sending time is parallel valves, no processing is performed; when the geometric distribution type of valves with the same signal sending time is series valves, the valves are sorted according to the fluid direction, and the signal sending time of the most upstream valve is used as its corresponding signal coordinated sending time, and the delay time ΔT is added in turn on the basis of the signal coordinated sending time of the previous valve of each downstream valve, and then the signal coordinated sending time of each valve with the same signal sending time is obtained, and the specific value of ΔT is 0.5s; when the geometric distribution type of valves with the same signal sending time is a confluence valve, the signal sending time corresponding to the downstream valve of the confluence point is used as its corresponding signal coordinated sending time, and the upstream valves are sorted from near to far according to the distance from the confluence point, and then the delay time ΔT is added in turn on the basis of the signal coordinated sending time of the previous valve of each upstream valve, and then the signal coordinated sending time of each valve with the same signal sending time is obtained.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The present invention adjusts the valves accordingly according to the real-time flow rate and the adjustment rate limit when the channel valves corresponding to the respective oxygen delivery channels are opened and closed, based on the adjustment rate limit of the different channel valves within the flow rate range, thereby avoiding the danger of excessive valve adjustment speed causing the gas medium flow rate in the pipeline to exceed the speed instantaneously, thereby further improving the safety of gas delivery in different oxygen delivery channels;

[0028] (2) The present invention determines the control delay time by analyzing historical control data to provide support for precise control; the signal sending time acquisition module comprehensively considers the adjustment completion time, adjustment mileage, control delay time and adjustment rate limit, calculates the signal sending time, ensures the adjustment accuracy of the channel valve, and makes the oxygen delivery channel more precise in controlling the delivery of oxygen;

[0029] (3) In the present invention, when there are multiple valves in the channel to be controlled, the signal sending time of each valve is collaboratively calculated according to the geometric distribution type of the multiple valves in the channel to be controlled with the same signal sending time, and then the signal collaborative sending time of the multiple valves in the channel to be controlled with the same signal sending time is optimized, so as to avoid instantaneous airflow disturbance and pressure superposition caused by simultaneous adjustment of multiple valves, thereby ensuring the stability and safety of the oxygen delivery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the system framework structure of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the two-dimensional coordinate curve of the present invention. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figure 1-Figure 2 , the present application provides an intelligent control system for oxygen delivery of a vertical oxygen concentrator, comprising;

[0034] The data acquisition module acquires the historical usage data corresponding to the channel valves of each delivery channel of the oxygen concentrator, wherein the historical usage data includes the historical gas flow rate, the valve switch duration, and the absolute value of the pressure difference of the channel valve at different adjustment rates;

[0035] It should be noted that in order to ensure the integrity and accuracy of the data, the default is that the data obtained does not have missing values ​​or abnormal values. Flow meters or velocity sensors are usually used to measure the flow rate of gas in the delivery channel, and the unit is usually liters / second or cubic meters / hour, etc., and rate sensors are used to record the adjustment rate of the channel valve. Differential pressure sensors or pressure gauges are used to measure the air pressure inside and outside the valve. These are all existing and mature technologies, so no further explanation is given here.

[0036] The historical usage data is collected through the data acquisition module to provide a basis for subsequent analysis.

[0037] The flow rate interval establishment module is used to analyze the historical usage data corresponding to each channel valve of the oxygen concentrator, obtain the flow rate state values ​​corresponding to the oxygen concentrator according to the analysis results, and establish the flow rate interval of the oxygen concentrator according to the flow rate state values. The specific method is as follows:

[0038] Obtain multiple historical gas flow rates in the historical usage data, and use the same gas flow rate value as a flow rate state value, thereby obtaining multiple flow rate state values ​​Ln, where n refers to different flow rate state values, i=1, 2, ..., a1, a1 refers to the total number of flow rate state values, a1 is a positive integer, and a1 satisfies a1≥2;

[0039] Sort the flow rate state values ​​Ln from left to right, and form a flow rate interval by combining every two adjacent flow rate state values, thereby establishing different flow rate intervals Qi of the oxygen concentrator, wherein i refers to different flow rate intervals, i=1, 2, ..., a2, a2 ​​refers to the total number of flow rate intervals, a2 is a positive integer, and a2=a1-1;

[0040] For example, a plurality of flow velocity state values ​​Ln are sorted from left to right as: W1, W2, W3, W4, and W5, and the different flow velocity intervals are: [W1, W2), [W2, W3), [W3, W4), and [W4, W5];

[0041] The gas flow rates in the historical usage data are analyzed through the flow rate interval establishment module, and the same gas flow rate value is defined as a flow rate state value. After obtaining multiple flow rate state values, they are sorted by size. Every two adjacent flow rate state values ​​form a flow rate interval, thereby constructing different flow rate intervals for the oxygen concentrator, providing a basis for precise control.

[0042] The adjustment rate limit acquisition module is used to analyze the pressure difference between the valve inside and outside the valve corresponding to different adjustment rates in different flow rate intervals of different channel valves of the vertical oxygen concentrator, and obtain the adjustment rate limit corresponding to different channel valves in different flow rate intervals according to the analysis results. The specific method is as follows:

[0043] S1: Randomly select one of the different flow rate intervals without replacement as the target interval;

[0044] S2: Randomly select one valve from different channel valves without replacement as the target channel valve;

[0045] Obtain the absolute values ​​of the pressure differences inside and outside the valve corresponding to different adjustment rates of the target channel valve in the target range, and mark them as EBe, and mark different adjustment rates as EAe;

[0046] Obtain the absolute value of the pressure difference between the inside and outside of the valve at different adjustment rates of the target channel valve in the target range. The absolute value of the pressure difference is the absolute value of the difference in the valve pressure values. The specific formula is: absolute value of the pressure difference = |valve internal pressure value - valve external pressure value|;

[0047] According to the absolute values ​​of the pressure differences EBe corresponding to the valves of the target channel at different adjustment rates EAe in the target interval, a two-dimensional coordinate curve is established, the two-dimensional coordinate curve is analyzed, and the adjustment rate limit corresponding to the valve of the target channel in the target interval is obtained according to the analysis results;

[0048] The specific method of establishing a two-dimensional coordinate curve is:

[0049] Different adjustment rates EAe are used as the horizontal coordinates, and the absolute values ​​of the pressure differences EBe corresponding to different adjustment rates EAe are used as the vertical coordinates, so as to obtain the coordinate points Ee (EAe, EBe) corresponding to different adjustment rates in the target interval of the target channel valve, and then each two adjacent coordinate points are connected in order from left to right to obtain a two-dimensional coordinate curve, and the connecting line between each two adjacent coordinate points is marked as the stage line of the two-dimensional coordinate curve. The slope Kj corresponding to each stage line is calculated according to the coordinates of the two coordinate points constituting each stage line, where e refers to different coordinate points, j refers to different stage lines on the two-dimensional coordinate curve, j=1, 2, ..., b, where b refers to the number of stage line pairs, and b is a positive integer;

[0050] The specific method of obtaining the slope Kj corresponding to each stage line is:

[0051] That is, the ratio between the difference between the ordinates of the last coordinate point and the previous coordinate point of each stage line and the difference between their corresponding abscissas is taken as the slope Kj corresponding to each stage line;

[0052] It should be noted that the first coordinate point on the stage line refers to the coordinate point closer to the origin among the two coordinate points, and the second coordinate point refers to the coordinate point on the right side of the stage line;

[0053] Obtain the horizontal coordinate value of the previous coordinate point on the stage line corresponding to the maximum slope Kmax, and use it as the corresponding adjustment rate limit H11 of the target channel valve within the target range;

[0054] S3: Repeat the above step S2 to obtain the corresponding adjustment rate limit H1h of different channel valves within the target range;

[0055] S4: Repeat the above steps S1-S3 to obtain the corresponding adjustment rate limit Hrh of different channel valves in different flow rate intervals, where h refers to different channel valves and r refers to different flow rate intervals;

[0056] By randomly selecting the target flow rate interval and the target channel valve, analyzing the absolute value of the pressure difference between the inside and outside of the valve at different adjustment rates of the target valve in this interval, a two-dimensional coordinate curve is established. According to the characteristics of the curve, the horizontal coordinate value of the previous coordinate point on the stage line corresponding to the maximum slope is used as the adjustment rate limit of the target valve in this interval. After repeated operations, the adjustment rate limits of different channel valves in different flow rate intervals are obtained, and the adjustment rate limit is determined to limit the valve adjustment speed and avoid danger caused by excessive speed.

[0057] The valve control module obtains the flow rate interval corresponding to the real-time flow rate of the channel valve to be adjusted according to the real-time flow rate of the channel valve to be adjusted, and controls the adjustment rate of the channel valve to be adjusted accordingly according to the adjustment rate limit of the channel valve to be adjusted within the flow rate interval;

[0058] When the valve control module switches the channel valves corresponding to each oxygen delivery channel, the valve is adjusted accordingly according to the adjustment rate limit of different channel valves within the flow rate range and the real-time flow rate and the adjustment rate limit, so as to avoid the risk of excessive valve adjustment speed causing instantaneous overspeed of the gas medium flow in the pipeline, thereby further improving the safety of gas delivery in different oxygen delivery channels.

[0059] Embodiment 2: As Embodiment 2 of the present invention, when the present application is specifically implemented, compared with Embodiment 1, the technical solution of this embodiment is different from that of Embodiment 1 only in that this embodiment further includes a control delay duration acquisition module;

[0060] The control delay time acquisition module obtains the historical control data corresponding to the channel valves of each delivery channel of the oxygen concentrator, analyzes the historical control data, and obtains the control delay time corresponding to different channel valves according to the analysis results. The specific method is as follows:

[0061] The historical control data includes the control signal sending time and the channel valve control time;

[0062] First, a valve is randomly selected from different channel valves without replacement as the analysis channel valve, and the absolute value of the time difference between the control signal sending time and the channel valve control time in the g-time historical control data of the analysis channel valve is marked as the control time difference Tt, where t refers to different control time differences, where t=1, 2, ..., g, g is a positive integer, and g refers to the number of control time differences, g is greater than 30, and here g=90;

[0063] Obtain the average of the maximum and minimum values ​​of the control time difference Tt, and use it as the control delay time CT1 of the analysis channel valve; then use the same analysis method to analyze the historical control data of the remaining channel valves, and then obtain the control delay time CTh corresponding to different channel valves;

[0064] The control delay time reflects the time difference between the control signal sent to the actual response action of the valves in different channels. In the complex oxygen delivery process, the control response speed of the valves in each channel is not instantaneous. Clarifying this delay time provides key data for compensating valve control delay, and can make time compensation in advance when setting the control strategy. Ensure that the valve can accurately reach the target state at the expected adjustment completion time, significantly improve the accuracy of valve adjustment time control, and improve the performance of the entire oxygen delivery intelligent control system.

[0065] Embodiment 3: As the embodiment 3 of the present invention, when the present application is implemented, the technical solution of this embodiment is different from that of the embodiments 1 and 2 only in that this embodiment further includes a signal sending time acquisition module;

[0066] The signal sending time acquisition module calculates the signal sending time corresponding to each valve of the channel to be controlled and controls the valve action according to the required adjustment completion time, required adjustment mileage and control delay time of each valve of the channel to be controlled and the adjustment rate limit corresponding to the real-time flow rate of the valve of the channel to be controlled. The specific method is as follows:

[0067] The required adjustment completion time of each channel valve to be controlled is marked as XTm, and the required adjustment mileage corresponding to each channel valve to be controlled is marked as Rm. The real-time flow rate of each channel valve to be controlled is obtained, and the adjustment rate limit corresponding to each channel valve to be controlled is obtained according to the real-time flow rate of each channel valve to be controlled, and marked as Vm, and the valve control delay time Wm of each channel to be controlled is obtained at the same time;

[0068] The required adjustment mileage Rm corresponding to each channel valve to be controlled is divided by the corresponding adjustment rate limit Vm to obtain the required adjustment time corresponding to each channel valve to be controlled. After adding the required adjustment time of each channel valve to be controlled and the valve control delay time Wm, the difference between the required adjustment completion time XTm corresponding to each channel valve to be controlled and the valve control delay time Wm is used as the signal sending time FTm corresponding to each channel valve to be controlled;

[0069] The specific calculation method is: by using the formula: FTm=XTm-(Rm÷Vm+Wm), calculate the signal sending time FTm corresponding to the valve of the channel to be controlled, where m is a different valve of the channel to be controlled;

[0070] It should be noted that the time required for the valves of each channel to be controlled to be adjusted is usually determined by the specific requirements of the production process and the process planning. For example, in a specific production task, according to the overall production rhythm and the precise demand for oxygen flow, a certain time will be preset to adjust the valve to a specific state. This time is the time required for the valves of the channel to be controlled to be adjusted. It can be obtained from the task arrangement of the production management system, or manually set by the engineer in the control system according to the production process parameters;

[0071] The required adjustment mileage refers to the opening size required to adjust the valve from the current position to the target position. When obtaining the value of the required adjustment mileage, the valve position sensor can be used to accurately measure the opening difference between the current position and the target position of the valve, which is used as the required adjustment mileage.

[0072] According to the signal sending time FTm of each valve of the channel to be controlled, the control signal is sent to each valve of the channel to be controlled, so as to ensure the adjustment accuracy of each valve of the channel in the oxygen delivery channel, so that the oxygen delivery channel can control the delivery of oxygen more accurately, and solve the problem of insufficient adjustment accuracy caused by the delay between the control signal sending and the actual action of the valve;

[0073] The control delay duration acquisition module is used to analyze historical control data and determine the control delay duration to provide support for precise control. The signal sending time acquisition module comprehensively considers the adjustment completion time, adjustment mileage, control delay duration and adjustment rate limit, calculates the signal sending time, and ensures the adjustment accuracy of the channel valve, making the oxygen delivery channel's control over oxygen delivery more precise, thereby ensuring the stability of oxygen delivery and the continuity of the production process.

[0074] Embodiment 4: As the fourth embodiment of the present invention, when the present application is implemented, the only difference compared with Embodiment 1, Embodiment 2 and Embodiment 3 is that the present embodiment further includes a multi-channel collaborative control module;

[0075] Multi-channel collaborative control module: when the valve of the channel to be controlled is unique, that is, when m=1, the system directly triggers the control signal sending according to the signal sending time of the valve, without sorting and collaborative judgment; when the valve of the channel to be controlled is not unique (that is, there are two or more valves of the channel to be controlled), and the signal sending time of each valve of the channel to be controlled is different, that is, when m>2, the signal sending time of all valves of the channel to be controlled is sorted from small to large in chronological order, and the control signal is triggered in sequence in the sorting order to ensure that the control order matches the adjustment rhythm, avoiding the instantaneous airflow disturbance and pressure superposition problems caused by the simultaneous adjustment of multiple valves;

[0076] If there are multiple valves in the channels to be controlled with the same signal sending time, in order to prevent sudden changes in system flow rate or pressure caused by the simultaneous opening and closing of multiple valves, it is necessary to perform collaborative calculations on the valves in the channels to be controlled with the same signal sending time according to the geometric distribution types of the valves in the channels to be controlled in the delivery channel. The specific method for obtaining the coordinated signal sending time of the valves in the channels to be controlled is as follows:

[0077] Based on the preset pipe network structure diagram, such as CAD topology diagram, BIM model, etc., which are existing and mature technologies, so no further elaboration is given here. The geometric distribution types of multiple channel valves to be controlled with the same signal sending time in the transmission channel are identified. The geometric distribution types are divided into parallel and series as well as confluence valves;

[0078] When multiple valves of the channels to be controlled are parallel valves in the delivery channel, since each branch of the parallel valve is independent, no processing is performed on the signal sending time of the multiple valves of the channels to be controlled with the same signal sending time, that is, the multiple valves of the channels to be controlled with the same signal sending time are allowed to send signals at the same time;

[0079] When multiple valves of the to-be-controlled channel are connected in series in the delivery channel, the multiple valves of the to-be-controlled channel with the same signal sending time are sorted according to the fluid direction, and the signal sending time corresponding to the most upstream valve is used as its signal coordinated sending time. At the same time, priority is adjusted according to the signal coordinated sending time corresponding to the most upstream valve, and the delay time ΔT is added to the signal coordinated sending time of the previous to-be-controlled channel valve of each downstream valve in turn, so as to obtain the signal coordinated sending time of the multiple valves of the to-be-controlled channel with the same signal sending time;

[0080] When multiple valves of the channels to be controlled are confluence valves in the conveying channel, that is, multiple upstream channels merge into the same main channel, the signal sending time corresponding to the valve downstream of the confluence point is used as its signal coordinated sending time, and then the upstream valves are sorted from near to far according to the distance between the upstream valves and the confluence point, and then the upstream valves are adjusted in sequence by delaying ΔT time in the sorting order, that is, the delay time ΔT is added in sequence to the signal coordinated sending time of the previous channel valve to be controlled of each upstream valve, and then the signal coordinated sending time of multiple channel valves to be controlled with the same signal sending time is obtained to avoid sudden changes in the confluence pressure. ΔT is a preset value, and the specific value is 0.5s;

[0081] The multi-channel collaborative control module identifies the geometric distribution type of valves in each channel in the delivery system (such as parallel, series, and confluence), collaboratively calculates the signal sending time of each valve, and then optimizes the collaborative signal sending time of multiple valves in the controlled channels with the same signal sending time, thereby realizing orderly scheduling and collaborative control of multi-valve adjustment operations, significantly reducing the risks of flow velocity disturbance and pressure mutation caused by simultaneous adjustment of multiple valves, effectively avoiding instantaneous airflow disturbance and pressure superposition problems caused by simultaneous operation of multiple valves, and significantly improving the operating stability, response accuracy and adjustment safety of the oxygen delivery system.

[0082] Embodiment 5: As the embodiment 5 of the present invention, when the present application is specifically implemented, compared with Embodiment 1, Embodiment 2, Embodiment 3 and Embodiment 4, the technical solution of this embodiment is to combine and implement the solutions of the above-mentioned Embodiment 1, Embodiment 2, Embodiment 3 and Embodiment 4.

[0083] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters and thresholds in the formula are set by technicians in this field according to actual conditions.

[0084] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An intelligent control system for oxygen delivery of a vertical oxygen concentrator, characterized in that: include; The data acquisition module obtains the historical gas flow rate of each channel valve, the valve opening and closing time, and the absolute value of the pressure difference of the channel valve at different adjustment rates; A flow rate interval establishment module obtains a flow rate state value according to the historical gas flow rate, and establishes multiple flow rate intervals according to the flow rate state value; The regulating rate limit acquisition module analyzes the absolute value of the air pressure difference of each channel valve at different regulating rates in different flow rate intervals, and generates the regulating rate limit values ​​corresponding to different channel valves at different flow rate intervals; The valve control module controls the regulating rate of the valve of the channel to be regulated according to the regulating rate limit of the flow rate interval corresponding to the real-time flow rate of the valve of the channel to be regulated; The control delay time acquisition module analyzes the control signal sending time of each channel valve and the channel valve control time to obtain the control delay time corresponding to different channel valves; The signal sending time acquisition module calculates and obtains the signal sending time corresponding to each valve in the channel to be controlled according to the required adjustment completion time, the required adjustment mileage and the control delay time of each valve in the channel to be controlled and the adjustment rate limit corresponding to the real-time flow rate; The multi-channel collaborative control module is used to collaboratively calculate the signal sending time of each channel valve to be controlled with the same signal sending time according to the geometric distribution type of each channel valve to be controlled with the same signal sending time when there are multiple channel valves to be controlled at the same time, and then obtain the collaborative signal sending time of each channel valve to be controlled with the same signal sending time.

2. The intelligent control system for oxygen delivery of a vertical oxygen concentrator according to claim 1 is characterized in that: The specific method of obtaining the flow velocity state value is: A plurality of historical gas flow rates are obtained, and gas flow rates having the same value are taken as a flow rate state value, thereby obtaining a plurality of flow rate state values.

3. The intelligent control system for oxygen delivery of a vertical oxygen concentrator according to claim 2 is characterized in that: The specific method of establishing multiple flow rate intervals is: Different flow rate state values ​​are sorted from left to right according to the numerical values, so that every two adjacent flow rate state values ​​form a flow rate interval, and then multiple flow rate intervals are established.

4. The intelligent control system for oxygen delivery of a vertical oxygen concentrator according to claim 3 is characterized in that: The specific method of generating the corresponding regulation rate limits of different channel valves in different flow rate ranges is as follows: S1: Randomly select one of the different flow rate intervals without replacement as the target interval; S2: Randomly select one valve from different channel valves without replacement as the target channel valve; Obtain the absolute values ​​of the pressure difference EBe corresponding to the target channel valve at different adjustment rates EAe in the target interval, establish a two-dimensional coordinate curve according to the absolute values ​​of the pressure difference EBe corresponding to the target channel valve at different adjustment rates EAe in the target interval, and analyze the two-dimensional coordinate curve to obtain the adjustment rate limit H11 corresponding to the target channel valve in the target interval, wherein e refers to different coordinate points; S3: Repeat step S2 to obtain the corresponding adjustment rate limit H1h of different channel valves within the target range; S4: Repeat steps S1-S3 to obtain the corresponding adjustment rate limit Hrh of different channel valves in different flow rate ranges, where h refers to different channel valves and r refers to different flow rate ranges.

5. The intelligent control system for oxygen delivery of a vertical oxygen concentrator according to claim 4 is characterized in that: The specific method of establishing a two-dimensional coordinate curve is: Different adjustment rates EAe are used as the horizontal coordinate, and the absolute values ​​of the air pressure differences EBe corresponding to different adjustment rates EAe are used as the vertical coordinate, so as to obtain the coordinate points Ee (EAe, EBe) corresponding to different adjustment rates in the target range of the target channel valve, and then connect each two adjacent coordinate points in order from left to right to obtain a two-dimensional coordinate curve.

6. The intelligent control system for oxygen delivery of a vertical oxygen concentrator according to claim 5 is characterized in that: The method for obtaining the corresponding adjustment rate limit of the target channel valve within the target range is: The connecting line between every two adjacent coordinate points is marked as the stage line of the two-dimensional coordinate curve. The slope corresponding to each stage line is calculated based on the coordinates of the two coordinate points that make up each stage line. The horizontal coordinate value corresponding to the previous coordinate point on the stage line with the maximum slope is obtained, and it is used as the adjustment rate limit H11 corresponding to the target channel valve in the target range.

7. The intelligent control system for oxygen delivery of a vertical oxygen concentrator according to claim 4 is characterized in that: The specific method of obtaining the control delay time corresponding to different channel valves is: First, a valve is randomly selected from different channel valves without replacement as the analysis channel valve, and the absolute value of the time difference between the time when the control signal of the analysis channel valve is sent g times and the control time of the channel valve is taken. Then, the average of the maximum and minimum values ​​of the absolute value of the difference is taken as the control delay time CT1 of the analysis channel valve. Finally, the same analysis method is used to analyze the historical control data of the remaining channel valves, and then the control delay time CTh corresponding to different channel valves is obtained, where g is a positive integer and g is greater than 30.

8. The intelligent control system for oxygen delivery of a vertical oxygen concentrator according to claim 7 is characterized in that: The specific method for calculating the signal sending time corresponding to each valve of the channel to be controlled is: The required adjustment completion time of each channel valve to be controlled is marked as XTm, and the required adjustment mileage is marked as Rm. The required adjustment mileage Rm corresponding to each channel valve to be controlled is divided by the corresponding adjustment rate limit Vm to obtain the required adjustment time corresponding to each channel valve to be controlled. After adding the required adjustment time of each channel valve to be controlled and the valve control delay time Wm, the difference between the required adjustment completion time XTm corresponding to each channel valve to be controlled and the valve control delay time Wm is used as the signal sending time FTm corresponding to each channel valve to be controlled, where m is a different channel valve to be controlled.

9. The intelligent control system for oxygen delivery of a vertical oxygen concentrator according to claim 5, characterized in that: The specific method for calculating the slopes corresponding to each stage line is: The ratio between the difference between the ordinates of the subsequent coordinate point and the previous coordinate point of each stage line and their corresponding difference in abscissas is taken as the slope corresponding to each stage line. The previous coordinate point on the stage line refers to the coordinate point closer to the origin among the two coordinate points, and the subsequent coordinate point refers to the coordinate point located on the right side of the stage line.

10. The intelligent control system for oxygen delivery of a vertical oxygen concentrator according to claim 9, characterized in that: The specific method for acquiring the coordinated signal sending time of each to-be-controlled channel valve having the same signal sending time is as follows: When the geometric distribution type of the valves of the to-be-controlled channels with the same signal sending time is a parallel valve, no processing is performed; when the geometric distribution type of the valves of the to-be-controlled channels with the same signal sending time is a series valve, the valves of the to-be-controlled channels are sorted according to the fluid direction, and the signal sending time of the most upstream valve is used as its corresponding signal coordinated sending time, and the delay time ΔT is added in sequence on the basis of the signal coordinated sending time of the previous valve of each downstream valve, and then the signal coordinated sending time of each valve of the to-be-controlled channels with the same signal sending time is obtained, and the specific value of ΔT is 0.5s; when the geometric distribution type of the valves of the to-be-controlled channels with the same signal sending time is a confluence valve, the signal sending time corresponding to the valve downstream of the confluence point is used as its corresponding signal coordinated sending time, and the upstream valves are sorted from near to far according to the distance between them and the confluence point, and then the delay time ΔT is added in sequence on the basis of the signal coordinated sending time of the previous valve of each upstream valve, and then the signal coordinated sending time of each valve of the to-be-controlled channels with the same signal sending time is obtained.

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