Pulse flow detection module and detection method for pulse oxygen generator

Abstract

The pulse flow detection module of the pulse oxygen generator comprises an oxygen storage tank, an oxygen release pipeline is arranged on the oxygen storage tank, and a flow limiting valve, a pressure sensor and an electromagnetic pulse valve are sequentially arranged on the oxygen storage tank. According to the pulse flow detection method, the problems that in the prior art, pulse flow detection equipment of the oxygen generator is large in size and heavy in weight are solved, the unit and the specific method which can still conduct pulse flow detection on the basis of the electromagnetic pulse valve and the flow sensor are provided, and the pulse flow detection device is smaller in size, lighter in weight and more convenient to use. The device can be matched with the pulse oxygen generator for integrated use, meets the international CE MDR standard, is lower in production and maintenance cost, and is more beneficial to market popularization.

Description

Technical Field

[0001] This invention relates to the field of gas flow detection equipment, and more particularly to a pulse flow detection module and detection method for a pulse oxygen generator. Background Technology

[0002] Traditional pulse flow detection typically requires both pressure and flow sensors to work together to report data in order to complete the calculation. During the detection process, a motor-driven mechanical valve or similar hardware rotates periodically, controlling the valve to open and close the pipeline, thus generating flow pulses. When the mechanical valve opens, gas flows out of the oxygen storage tank, passing sequentially through the pressure and flow sensors. The relevant data is acquired by the sensors and sent to the processor, which then calculates and displays the results.

[0003] However, this traditional pulse flow generation and detection scheme has significant drawbacks. The core issue is that flow sensors and motor-driven mechanical valves are typically bulky and heavy. Current mainstream portable oxygen concentrators, limited by their lightweight and portable design goals, cannot accommodate such large hardware. For safety reasons, higher standards have been set internationally for portable oxygen concentrators: they must be able to detect their own pulse flow and issue an alarm promptly when the flow exceeds the limit.

[0004] There is currently a lack of corresponding solutions to the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pulse flow detection module and detection method for a portable pulse oxygen generator that is simple in structure, small in size and light in weight, based on a more reasonable structural layout and related algorithms, and suitable for integrated configuration of a portable pulse oxygen generator.

[0006] The pulse flow detection module includes an oxygen storage tank, which is a storage device for oxygen generated by the oxygen generation module in the pulse oxygen generator; the oxygen storage tank is provided with an oxygen release pipe, and a flow limiting valve, a pressure sensor and an electromagnetic pulse valve are sequentially arranged on the oxygen storage tank.

[0007] Furthermore, the flow-limiting valve is a copper valve with a fixed cross-sectional area inside the valve body, and its cross-sectional area is smaller than that of the oxygen release pipeline.

[0008] Preferably, "less than" here means "far less than", and the cross-sectional area of ​​the valve body of the flow limiting valve is provided in various specifications.

[0009] The effect achieved is as follows: when the electromagnetic pulse valve opens, the high-pressure gas in the oxygen storage tank is discharged under pressure. As the gas passes through the flow-limiting valve in the oxygen release pipeline, because the flow cross-sectional area of ​​the valve body is much smaller than that of the pipeline, the drastically fluctuating pressure of the gas becomes relatively stable due to the abrupt change in cross-sectional area. This results in relatively stable parameters captured by the pressure sensor. During the pulse valve's opening and closing cycle, the pressure sensor acquires pressure data, and after the flow stabilizes, the data for each cycle shows high consistency, providing a stable data foundation for pulse flow calculation.

[0010] The pulse flow detection method is as follows:

[0011] In the formula, P1…P N N sets of data, in Pa, are detected by the pressure sensor within one pulse valve opening cycle T.

[0012] ρ P This is the average pressure. Density, unit kg / m³ 3 ;

[0013] t is the time interval for pressure sensor detection, in seconds;

[0014] In the formula, N*t represents the pulse valve opening time;

[0015] X is the equivalent diameter of the system piping;

[0016] More specifically, P1 is the starting data for the pressure sensor to begin confirming the count;

[0017] P N The endpoint data for confirming the termination of the pressure sensor count;

[0018] Starting data P1 and ending data P N The pressure sensor is set to record data every time interval t.

[0019] The beneficial effects of this invention are: This invention solves the problems of large size and heavy weight of pulse flow detection equipment for oxygen concentrators in the prior art, and provides a unit and specific method based on an electromagnetic pulse valve that can still perform pulse flow detection after the flow sensor is removed. It is smaller and lighter, can be adapted for integrated use in pulse oxygen concentrators, complies with the international CE MDR standard, and has lower production and maintenance costs, making it more conducive to market promotion. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a pulse flow detection module for a pulse oxygen generator according to the present invention;

[0021] Figure label:

[0022] 1-Oxygen storage tank 2-Flow limiting valve 3-Oxygen release pipeline 4-Pressure sensor 5-Solenoid pulse valve

[0023] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] Reference Figure 1 The pulse flow detection module of the pulse oxygen generator of the present invention includes an oxygen storage tank 1, which is a storage device for oxygen generated by the oxygen generation module in the pulse oxygen generator; the oxygen storage tank 1 is provided with an oxygen release pipe 3, and a flow limiting valve 2, a pressure sensor 4 and an electromagnetic pulse valve 5 are sequentially arranged on the oxygen storage tank 1.

[0025] Furthermore, the flow limiting valve 2 is a copper valve with a fixed cross-sectional area inside the valve body, and its cross-sectional area is smaller than that of the oxygen release pipe 3.

[0026] Preferably, the term "less than" here means "far less than", and the cross-sectional area of ​​the valve body of the flow limiting valve 2 is provided with various specifications of products.

[0027] The effect achieved is as follows: when the electromagnetic pulse valve 5 opens, the high-pressure gas in the oxygen storage tank 1 is discharged under pressure. As it passes through the flow-limiting valve 2 in the oxygen release pipeline 3, because the flow cross-sectional area of ​​the valve body is much smaller than that of the pipeline, the gas, which experiences drastic pressure fluctuations, becomes relatively stable due to the abrupt change in cross-sectional area. This results in relatively stable parameters captured by the pressure sensor 4. During the pulse valve's opening and closing cycle, the pressure sensor 4 acquires pressure data. After the flow stabilizes, the data for each cycle shows high consistency, providing a stable data basis for pulse flow calculation.

[0028] The pulse flow detection method is as follows:

[0029] In the formula, P1…P N N sets of data, in Pa, are detected by the pressure sensor within one pulse valve opening cycle T.

[0030] ρ P This is the average pressure. Density, unit kg / m³ 3 ;

[0031] t is the time interval for pressure sensor detection, in seconds;

[0032] In the formula, N*t represents the pulse valve opening time;

[0033] X is the equivalent diameter of the system piping;

[0034] More specifically, P1 is the starting data for the pressure sensor to begin confirming the count;

[0035] P N The endpoint data for confirming the termination of the pressure sensor count;

[0036] Starting data P1 and ending data P N The pressure sensor is set to record data every time interval t.

[0037] Example 1: After the pulse valve opens, when the pressure sensor records two adjacent sets of data P... x1 and P y1 conform to And |P x1 -P y1 |>P e Then, consider P. x1 The starting data P1 is used to confirm the count of the pressure sensor.

[0038] After the pulse valve closes, when the pressure sensor records two adjacent sets of data P x2 and P y2 conform to And |P x2 -P y2 |>P e Then, consider P. x2 The endpoint data P for terminating the count of the pressure sensor is confirmed. N .

[0039] From P1 to P N During the process, a total of N sets of data were recorded.

[0040] Among them, P sz % represents the system pressure disturbance value, P e This represents the system environmental disturbance value.

[0041] Furthermore, the system pressure disturbance value P sz %, conforming to P s1 %>P sz %>P s2 %.

[0042] Where P s1 % represents the minimum rate of change of pulse pressure, P s2 % represents the maximum rate of change during the pulse nitrogen removal process.

[0043] Where P s1 % refers to the multiple records of P during multiple pressure sensor detection cycles when the pulse valve opens and nitrogen is simultaneously discharged. 0.. P1…P z… P N ...record N+1 data points each time, and take P0, P1, P... from each record.N-1 P N Four data points, compared and The minimum value among the two data results is denoted as P. s1 %.

[0044] Where P s2 % refers to the record of P1…P during multiple pressure sensor detection cycles when the pulse valve is closed and nitrogen is simultaneously released. z… P N ...There are N data points in total. Take the data from two adjacent sets... The result of the maximum value is denoted as P. s2 %.

[0045] Furthermore, during the opening and closing of the pulse valve, the oxygen generator's nitrogen purging process occurs simultaneously. The discharged high-pressure nitrogen gas can affect the pressure sensor detection in the system pipeline. Therefore, it is important to obtain the pressure sensor readings when the pulse valve is closed and nitrogen is being purged at the same time. The maximum value is taken as the minimum consideration value, and the value is obtained when the pulse valve is opened and nitrogen is discharged simultaneously. and The minimum value among the two data results is taken as the maximum consideration value. This applies when any two adjacent data sets P are tested during the detection process. x and P y conform to If the time frame is not met, it is considered an influence of nitrogen excretion, and the data is not recorded. During the detection process, any two adjacent sets of data P... x and P y conform to This is considered valid detection data for the pulse valve opening, but it's easy to miss P... x and P y The data was similar to previous results. Because the pressure sensor itself has some error, in order to both eliminate the influence of nitrogen purging on the pressure and not miss key data, in P... s1 % and P s2 The system pressure disturbance value P is set between % and %. sz %, to make it conform to P s1 %>P sz %>P s2 %, so that during the detection process, any two adjacent sets of data P x and P y conform to At that time, P can be viewed x and P y For valid data and further through system environment disturbance value P e Make the final judgment.

[0046] Furthermore, the system environmental disturbance value P e , conforms to |P Z- P Z+1 |最小 >P e >P ec .

[0047] Where |P Z -P Z+1 | 最小 For any two sets of data P acquired when the aforementioned pulse valve is closed and nitrogen is simultaneously discharged Z and P Z+1 The minimum of the absolute values ​​of the differences.

[0048] P ec This is the maximum difference between the environmental pressure inside the pipeline and the atmospheric pressure at the geographical location when the system is not in operation.

[0049] Furthermore, the pressure sensor tests gauge pressure data after subtracting the atmospheric pressure of the geographical location. Even when the system is not operating, the pressure sensor continues to record data. During the testing process, fluctuations in the ambient pressure around the product can cause any two adjacent sets of data to show different values ​​(P). x and P y Similarly, it conforms to... The system error record shows that the maximum difference P in environmental pressure fluctuations is the cause. ec It is much smaller than the pressure difference in the system pipeline when the system is working. Therefore, in order to avoid interference and prevent the system from recording incorrect data, any two sets of data P measured by the pressure sensor are... x and P y It should conform to |P x -P y |>P ec .

[0050] Furthermore, in product operation, the software system not only processes data that meets the criteria, but also records data that does not meet the criteria. This includes data where any two sets of data P measured by the pressure sensor... x and P y Conforms to |P x -P y |>P ec If no upper limit is set, it will lead to |P x -P y The data obtained when the pulse valve is closed and nitrogen is being released simultaneously conflicts with the data obtained when the system is operating normally. To distinguish between environmental interference and interference from nitrogen release during system operation, any two sets of data P obtained when the pulse valve is closed and nitrogen is being released simultaneously are being compared. Z and P Z+1 The minimum of the absolute values ​​of the differences, i.e., |P Z -P Z+1 | 最小 As the upper limit for judgment, in order to facilitate recording the system environment disturbance value P, e To make it satisfy |P Z- PZ+1 | 最小 >P e >P ec Thus, when any two sets of data P measured by the pressure sensor x and P y Conforms to |P x -P y | <P e At that time, it was considered as environmental interference, while |P x -P y |>P e At that time, it is necessary to combine Further determination is needed to determine whether the data represents nitrogen evacuation and is valid working data.

[0051] Furthermore, any two sets of data P measured by the pressure sensor x and P y It can be determined by the system pressure disturbance value P. sz %, system environmental disturbance value P e Different results were determined.

[0052] when |P x -P y |>P e At that time, the system determines that the data is valid.

[0053] when |P x -P y | <P e At that time, the system determined that the data was due to environmental interference.

[0054] when |P x -P y |>P e At that time, the system determined the data to be nitrogen removal interference.

[0055] when |P x -P y | <P e At that time, the system determined that the data was due to environmental interference.

[0056] In Example 2, t is the time interval for the pressure sensor to detect data, and the total opening time of the pulse valve is T. A time precision a can be set, so t = T * a. Therefore, at least N = T / t data points can be collected in each cycle.

[0057] Example 3, where X is the equivalent cross-sectional area of ​​the pipe, specifically:

[0058] The maximum instantaneous flow rate of the product's pulse flow is set to Q, in meters. 3 / s. The pressure of the oxygen storage tank at this setting is Pm, in Pa / Pa. According to the formula ΔP=0.5*ρ*v^2+λ*0.5*ρ*v 2 Where ρ is the air density, ΔP is the pressure difference, v is the air velocity, and λ is the pipe pressure loss coefficient, which is obtained from a table. Substituting ΔP = Pm, the air velocity vm at the current gear can be calculated. The equivalent cross-sectional area of ​​the inner hole of the copper sphere is Smix = Q / vm.

[0059] Example: The maximum instantaneous flow rate at the inlet of this product at setting 6 is 12L / min, while the pressure of the oxygen storage tank at this setting is 100kpa (gauge pressure).

[0060] According to the formula ΔP=0.5*ρ*v^2+λ*0.5*ρ * v 2 Substituting ΔP = 100000 Pa, the pipeline pressure loss coefficient λ = 0.5 (from the table), and the air density ρ = 1.3 kg / m³, we get the following: 3 Therefore, the air velocity is v = 320 m / s.

[0061] Based on a flow rate of 12 L / min, the cross-sectional area is... Equivalent to a 0.9mm round hole.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pulse flow detection module for a pulse oxygen generator, comprising an oxygen storage tank, wherein the oxygen storage tank is provided with an oxygen release pipe, characterized in that, A flow-limiting valve, a pressure sensor, and an electromagnetic pulse valve are sequentially installed on the oxygen storage tank.

2. The flow limiting valve in the pulse flow detection module of the pulse oxygen generator according to claim 1 is a copper valve with a fixed cross-sectional area inside the valve body, and its cross-sectional area is smaller than that of the oxygen release pipeline.

3. The pulse flow detection module for a pulse oxygen generator according to claim 1, characterized in that, Its pulse flow detection method is as follows: Wherein, P1…P N N sets of data detected by the pressure sensor within one pulse valve opening cycle T, in Pa; ρ P This is the average pressure. Density, unit kg / m³ 3 ; t is the time interval for pressure sensor detection, in seconds; In the formula, N*t is the pulse valve opening time; X is the equivalent diameter of the system piping; More specifically, P1 is the starting data for the pressure sensor to begin confirming the count; P N The endpoint data for confirming the termination of the pressure sensor count; Starting data P1 and ending data P N The pressure sensor is set to record data every time interval t.

4. The detection method for a pulse flow detection module of a pulse oxygen generator according to claim 3, characterized in that, After the pulse valve opens, when the pressure sensor records two adjacent sets of data P x1 and P y1 conform to And |P x1 -P y1 |>P e Then, consider P. x1 The starting data P1 is used to confirm the start of the counting for the pressure sensor; After the pulse valve closes, when the pressure sensor records two adjacent sets of data P x2 and P y2 conform to And |P x2 -P y2 |>P e Then, consider P. x2 The endpoint data P for terminating the count of the pressure sensor is confirmed. N ; From P1 to P N During the process, a total of N sets of data were recorded; Among them, P sz % represents the system pressure disturbance value, P e This represents the system environmental disturbance value.

5. The detection method for a pulse flow detection module of a pulse oxygen generator according to claim 4, characterized in that, System pressure disturbance value P sz %, conforming to P s1 %>P sz %>P s2 %; Where P s1 % represents the minimum rate of change of pulse pressure, P s2 % represents the maximum rate of change during the pulse nitrogen purging process; Where P s1 % refers to the multiple records of P during multiple pressure sensor detection cycles when the pulse valve opens and nitrogen is simultaneously discharged. 0.. P1…P z… P N ...record N+1 data points each time, and take P0, P1, P... from each record. N-1 P N Four data points, compared and The minimum value among the two data results is denoted as P. s1 %; Where P s2 % refers to the record of P1…P during multiple pressure sensor detection cycles when the pulse valve is closed and nitrogen is simultaneously released. z… P N ...There are N data points in total. Take the data from two adjacent sets... The result of the maximum value is denoted as P. s2 %.

6. The detection method for a pulse flow detection module of a pulse oxygen generator according to claim 4, characterized in that, During the opening and closing of the pulse valve, the oxygen generator also purges nitrogen. The high-pressure nitrogen discharged can affect the pressure sensors in the system pipeline. Therefore, it is crucial to obtain the pressure readings when the pulse valve closes and nitrogen is purged simultaneously. The maximum value is taken as the minimum consideration value, and the value is obtained when the pulse valve is opened and nitrogen is discharged simultaneously. and The minimum value among the two data results is taken as the maximum consideration value. This applies when any two adjacent data sets P are tested during the detection process. x and P y conform to If the time is too short, it is considered to be affected by nitrogen excretion, and the data is not recorded; during the detection process, any two adjacent sets of data P x and P y conform to This is considered valid detection data indicating that the pulse valve is open. In P s1 % and P s2 A system pressure disturbance value P is also set between %. sz %, to make it conform to P s1 %>P sz %>P s2 %, so that during the detection process, any two adjacent sets of data P x and P y conform to At that time, P can be viewed x and P y For valid data and further through system environment disturbance value P e Make the final judgment.

7. The detection method for a pulse flow detection module of a pulse oxygen generator according to claim 4, characterized in that, System environmental disturbance value P e , conforms to |P Z- P Z+1 | 最小 >P e >P ec ; Where |P Z -P Z+1 | 最小 For any two sets of data P acquired when the aforementioned pulse valve is closed and nitrogen is simultaneously discharged Z and P Z+1 The minimum of the absolute values ​​of the differences; P ec This is the maximum difference between the environmental pressure inside the pipeline and the atmospheric pressure at the geographical location when the system is not in operation. The pressure sensor tests gauge pressure data by subtracting the atmospheric pressure of the geographical location. Even when the system is not operating, the pressure sensor continues to record data. During the testing process, fluctuations in the ambient pressure around the product can cause any two adjacent data sets to show different values ​​(P). x and P y Similarly, it conforms to... The system error record shows that the maximum difference P in environmental pressure fluctuations is the cause. ec It is much smaller than the pressure difference in the system pipeline when the system is working. Therefore, in order to avoid interference and prevent the system from recording incorrect data, any two sets of data P measured by the pressure sensor are... x and P y It should conform to |P x -P y |>P ec .

8. The detection method for a pulse flow detection module of a pulse oxygen generator according to claim 4, characterized in that, In product operation, the software system not only processes data that meets the criteria, but also records data that does not meet the criteria. This includes data where any two sets of data P measured by the pressure sensor... x and P y Conforms to |P x -P y |>P ec To distinguish between environmental interference and nitrogen venting interference during system operation, any two sets of data P were obtained when the pulse valve was closed and nitrogen was vented simultaneously. Z and P Z+1 The minimum of the absolute values ​​of the differences, i.e., |P Z -P Z+1 | 最小 As the upper limit for judgment, in order to facilitate recording the system environment disturbance value P, e To make it satisfy |P Z- P Z+1 | 最小 >P e >P ec Thus, when any two sets of data P measured by the pressure sensor x and P y Conforms to |P x -P y | <P e At that time, it was considered as environmental interference, while |P x -P y |>P e At that time, it is necessary to combine Further determination is needed to determine whether the data represents nitrogen evacuation and is valid working data.

9. The detection method for a pulse flow detection module of a pulse oxygen generator according to claim 4, characterized in that, Any two sets of data P measured by the pressure sensor x and P y It can be determined by the system pressure disturbance value P. sz %, system environmental disturbance value P e Different results were determined; when |P x -P y |>P e When the system determines the data is valid; when |P x -P y | <P e At that time, the system determined the data to be due to environmental interference; when |P x -P y |>P e At that time, the system determined the data to be nitrogen removal interference; when |P x -P y | <P e At that time, the system determined that the data was due to environmental interference.

10. The detection method for a pulse flow detection module of a pulse oxygen generator according to claim 3, characterized in that, t is the time interval for the pressure sensor to detect data. The total opening time of the pulse valve is T. A time precision a can be set, then t = T * a. Therefore, at least N = T / t data points can be collected in each cycle.

11. The detection method for a pulse flow detection module of a pulse oxygen generator according to claim 3, characterized in that, X is the equivalent cross-sectional area of ​​the pipe, specifically: The maximum instantaneous flow rate of the product's pulse flow is set to Q, in meters. 3 / s; The pressure of the oxygen storage tank at this setting is Pm, in Pa / Pa. According to the formula ΔP=0.5*ρ*v^2+λ*0.5*ρ*v 2 Where ρ is the air density, ΔP is the pressure difference, v is the air velocity, and λ is the pipe pressure loss coefficient, which can be found in the table; substituting ΔP=Pm, the air velocity vm at the current gear can be calculated; the equivalent cross-sectional area of ​​the inner hole of the copper ball is Smix=Q / vm.

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