CN112730607B - Ultrasonic oxygen concentration measuring method and system based on flow detection and oxygen generation system - Google Patents
Ultrasonic oxygen concentration measuring method and system based on flow detection and oxygen generation system Download PDFInfo
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- CN112730607B CN112730607B CN202011629827.0A CN202011629827A CN112730607B CN 112730607 B CN112730607 B CN 112730607B CN 202011629827 A CN202011629827 A CN 202011629827A CN 112730607 B CN112730607 B CN 112730607B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
- A61M2016/102—Measuring a parameter of the content of the delivered gas
- A61M2016/1025—Measuring a parameter of the content of the delivered gas the O2 concentration
Abstract
The invention relates to the technical field of portable oxygen generator measurement, in particular to an ultrasonic oxygen concentration measurement method and system based on flow detection and an oxygen generation system, wherein the method comprises the following steps: acquiring a temperature value D in the oxygen concentration measuring tube when the flow is stable, wherein the stable flow refers to a stage that an oxygen generating unit continuously sprays oxygen to a user in a pulse oxygen supply mode of the portable oxygen generator; recording the time T used for the ultrasonic transducer A to transmit ultrasonic waves and the ultrasonic transducer B to receive ultrasonic signals 10 (ii) a And the time T for the ultrasonic transducer B to transmit ultrasonic waves and the ultrasonic transducer A to receive ultrasonic signals 20 Calculating T Average ＝(T 10 +T 20 ) The oxygen concentration measuring tube is internally and oppositely provided with an ultrasonic transducer A and an ultrasonic transducer B; using temperature values D and T Average And fitting equations constructed for temperature, time and concentration for real-time concentration calculations. According to the invention, the oxygen concentration value obtained by accurately collecting the data used in the oxygen concentration calculation is more accurate.
Description
Technical Field
The invention relates to the technical field of oxygen concentration measurement in a portable oxygen generator, in particular to an ultrasonic oxygen concentration measurement method and system based on flow detection and an oxygen generation system.
Background
In portable oxygenerators, the concentration of the produced oxygen needs to be detected in an irregular or real-time manner, and when the concentration does not reach the standard, users need to be informed, and some oxygenerators need to adjust the performance of other parts according to the change of the oxygen concentration so as to meet the requirements of the users on the oxygen in different states as far as possible.
Among the prior art, set up oxygen concentration survey buret on oxygen therapy pipeline usually, the oxygen of carrying for the user continues to carry for the user after the buret through oxygen concentration survey, but to the oxygen concentration survey buret that utilizes the ultrasonic wave to carry out the oxygen concentration test, the flow of the oxygen air current in it not only can lead to the fact great decay to the ultrasonic wave, when the ultrasonic wave that leads to launching from the transducer reachs the receiving terminal, great decay has been had already, because the disturbance of mixed and disorderly air current, also make ultrasonic detection's error further increase, the oxygen concentration who obtains is not accurate.
Disclosure of Invention
According to the defects of the prior art, the method and the device have the advantage that the obtained oxygen concentration value is more accurate by accurately collecting the data used in the calculation of the oxygen concentration.
The invention provides an ultrasonic oxygen concentration measuring method based on flow detection, which comprises the following steps:
Further, the specific implementation process of step 1 is as follows:
step (1) obtaining a flow value H detected by a flow sensor, and judging whether H is in a preset range H 1 <h<H 2 When the judgment result is yes, recording the duration t' in the range;
step (2) judging whether the duration T 'is equal to a preset time T' 1 Generating a flow stabilizing signal;
responding to the flow stability signal, and acquiring a temperature value D detected by the temperature sensor at the moment;
the flow sensor is arranged on an oxygen delivery pipeline between the oxygen generation unit and a user aerobic place.
Further, before generating the flow stabilization signal in the step (2), the supply voltage of the ultrasonic transducer is increased.
Further, the specific implementation process for increasing the supply voltage of the ultrasonic transducer is as follows:
step a, judging that the duration T 'is equal to a preset time T' 2 Of is, wherein T' 2 <T′ 1 Generating a voltage boost signal;
step b, responding to the voltage boosting signal, boosting the supply voltage of the ultrasonic transducer from V 0 To a preset V ', where V' = V 0 *(1+a％)，V 0 The voltage is supplied to the transducer before the voltage is boosted, wherein a is more than or equal to 10 and less than or equal to 20, and a is an integer.
Further, in step 3, the fitting equation is:
A＝a*D；
B＝b*T 0 ；
C＝c*D 2 ；
D＝d*D*T；
E＝e*D 3 ；
F＝f*D 2 *T 0 ；
m concentration = n + a + B + C + D + E + F;
wherein a, b, c, d, e, f and n are all preset coefficients of a fitting equation.
On the other hand, the invention also provides an ultrasonic oxygen concentration measuring system based on flow detection, which comprises a circuit board; and a process for the preparation of a coating,
the temperature sensor is attached to the circuit board and used for detecting the oxygen temperature; and a process for the preparation of a coating,
an oxygen concentration measuring tube fixed on the circuit board and provided with an opening A and an opening B, wherein the edge of the opening A extends downwards to be abutted against the surface of the circuit board, and the temperature sensor is arranged in the range formed by the edge of the opening A; and a (C) and (D) and,
one end of the diffusion pipe is communicated with the opening B, the other end of the diffusion pipe is communicated with an oxygen delivery pipeline, the oxygen delivery pipeline is used for communicating an oxygen generation unit and a user aerobic place, and the oxygen generation unit is used for generating oxygen; and a process for the preparation of a coating,
the ultrasonic transducer A and the ultrasonic transducer B are oppositely arranged in the oxygen concentration measuring tube and are alternately used for transmitting and receiving ultrasonic signals;
a master control module for performing the method of any of the above; and the temperature sensor, the ultrasonic transducer A and the ultrasonic transducer B are in communication connection with the main control module.
Furthermore, a diffusion channel is formed in the diffusion tube and is used for communicating the head end and the tail end of the diffusion tube;
the diffusion channel is 1 or more zigzag channels;
or a plurality of layers of hollow baffles are arranged in the diffusion channel, and hollow holes of each layer of hollow baffles are staggered with each other;
or the diffusion channel is a plurality of straight channels.
Furthermore, the circuit board around the temperature sensor is provided with exposed copper sheets, the copper sheets are positioned in the range enclosed by the outward extending part of the edge of the opening A, and the number of the copper sheets is more than or equal to 1.
In yet another aspect, the present invention further provides an oxygen generation system, comprising an oxygen generation unit for producing oxygen, an oxygen delivery pipeline for delivering oxygen from the oxygen generation unit to a user's oxygen demand, and the ultrasonic oxygen concentration measurement system based on flow detection as described in any one of the above.
The invention has the following beneficial effects: (1) When the oxygen flow is stable, the method acquires and calculates the data related to the oxygen concentration, and reconstructs the fitting equation for calculating the concentration again, compared with the condition that whether the measured gas flow is stable or not in the prior art, the data acquired by the method is more accurate, and the finally obtained oxygen concentration value is closer to a real value; (2) The method comprises the steps of firstly testing whether the oxygen flow is stable, and acquiring relevant data for calculating the oxygen concentration only when the obtained oxygen flow meets the preset stable condition, so that the accuracy of the data in the process of calculating the oxygen concentration is greatly improved; (3) When the method detects that the oxygen flow has a stable trend, namely before the flow is really determined to be stable, the supply voltage of the transducer is increased in advance, so that the transmitting power of the transducer is increased, the attenuation caused by the collision of the airflow on the ultrasonic signal is reduced, and the accuracy of the ultrasonic signal received by the ultrasonic transducer is improved; (4) According to the test system, the temperature sensor is directly attached to the circuit board, and compared with a mode that the temperature sensor is inserted into the middle of the oxygen concentration measuring tube in the prior art, the test system reduces the obstruction to the propagation process of the ultrasonic signals in the tube, is beneficial to the accuracy of acquired propagation data, and is convenient for an assembly process; (5) According to the method, the copper sheets are arranged on the surface, close to the inner part of the oxygen concentration measuring tube, of the circuit board around the temperature sensor, so that the sensing force of the temperature sensor on the temperature in the oxygen concentration measuring tube is increased, the detection accuracy is improved, the defect that gas measurement cannot be carried out in an ultrasonic propagation path of the oxygen concentration measuring tube like a vertical temperature sensor is well overcome, and the temperature of gas in the oxygen concentration measuring tube can be accurately sensed.
The oxygen system that this application provided can provide more accurate oxygen concentration numerical value for the user, promotes the user and uses experience.
In conclusion, the method and the system of the invention can influence the accuracy of the collected data in the oxygen concentration measurement of the portable oxygen generator, and further the oxygen concentration calculation result is more accurate.
Drawings
FIG. 1 is a schematic flow diagram of a method provided by the present invention;
FIG. 2 is a schematic flow chart of how to determine the flow stability and perform the temperature value D acquisition in the method provided by the present invention;
FIG. 3 is a schematic flow chart of a method for raising the supply voltage of an ultrasonic transducer in advance before the flow rate is stabilized according to the method provided by the present invention;
FIG. 4 is a schematic perspective view of a combination of a circuit board, an oxygen concentration measuring tube and a diffuser tube according to an embodiment of the present invention;
FIG. 5 is a schematic perspective view of an oxygen concentration measuring tube according to an embodiment of the present invention;
FIG. 6 is a schematic top view of a combination of a circuit board, an oxygen concentration measurement tube and a diffuser tube in an embodiment provided by the present invention;
FIG. 7 is an enlarged, partially cross-sectional view of the structure of portion A of FIG. 6;
FIG. 8 is a schematic structural view of a circuit board with a hollow, a temperature sensor and a bare copper sheet according to an embodiment of the present invention;
FIG. 9 is a schematic perspective view of a combination of a circuit board, an oxygen concentration measuring tube and a diffuser tube according to an embodiment of the present invention;
in the figure: 1. the oxygen concentration measuring tube 11, the opening A12, the opening B2, the circuit board 21, the sealing ring 22, the copper sheet 23, the hollow 24, the bolt 31, the ultrasonic transducer A32, the ultrasonic transducer B4, the temperature sensor 5, the diffusion tube 51, the diffusion channel 52, the air inlet 53 and the air outlet.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example (b):
the invention provides an ultrasonic oxygen concentration measuring method which is used for more accurately measuring the oxygen production concentration in an oxygen generator. The ultrasonic concentration measurement is characterized in that the ultrasonic concentration measurement is very sensitive to the flowing state of gas in a pipeline. In an oxygen generator, after oxygen is generated in an oxygen generation unit, the oxygen is supplied to a user through an oxygen supply line, and an oxygen concentration measuring tube is disposed on the oxygen supply line. When the oxygen supply to the user is in a pulse mode, the air flow of the oxygen in the pipeline in the oxygen supply pipeline has various states, and when the oxygen generator sprays oxygen to the user, the air flow is stable, but before spraying and after finishing spraying, because the air flow is changed from the absence to the presence or from the presence to the absence, the air flow in the oxygen supply pipeline is unstable and uneven. At this time, when the ultrasonic measurement is performed, the ultrasonic waves are also disturbed by unstable and disordered air flow, which causes inaccuracy of the detection result.
After the gas flow is determined to be stable, the parameters of the propagation of the ultrasonic waves in the gas are collected, and the accuracy is improved. The oxygen generator is internally provided with a main control module, an ultrasonic transducer A, an ultrasonic transducer B and a temperature sensor, wherein the main control module is used for reading parameter information of the ultrasonic transducer A/B and the temperature sensor and controlling the voltage of the ultrasonic transducer A and the voltage of the ultrasonic transducer B and the receiving and sending of signals, and a program can be also arranged in the main control module and used for sending out control signals and responding to certain signals to make new control signals. The main control module, the ultrasonic transducer A, B and the temperature sensor are in communication connection.
As shown in fig. 1, the method provided by the present application includes the following specific steps:
firstly, the main control module needs to judge when the flow is stable, because the flow field in the oxygen concentration measuring tube is not excessively disordered after the flow is stable after oxygen supply is carried out on a user, the attenuation to ultrasonic signals is minimum, and the obtained ultrasonic wave propagation time data is most accurate.
Because the oxygen supply in the oxygen supply line is constant in the continuous oxygen supply mode, the oxygen concentration in the oxygen concentration measuring tube and the oxygen concentration in the oxygen supply line are equal, and no air flow flows in the oxygen concentration measuring tube (as long as the gear is not replaced), namely the air flow is stable. A short continuous oxygen supply phase in the pulse mode, similar to the situation in the continuous oxygen supply mode.
When the flow in the step 1 is stable, relevant data acquisition in the calculation of the oxygen concentration is carried out for the time period, and the concentration calculation is carried out, so that the result is more accurate. In this case, in an embodiment, as shown in fig. 2, the specific implementation process of step 1 is as follows:
s (1) a main control module acquires a flow value H detected by a flow sensor and judges whether H is in a preset range H 1 <h<H 2 When the judgment result is yes, recording the duration t' in the range; when the system is in the stage of oxygen spraying to the user, H 1 And H 2 Is the range of flow rates at which such a condition is detected. The flow sensor is arranged on an oxygen delivery pipeline between the oxygen generation unit and the user aerobic place, the oxygen generation unit is used for generating oxygen, and the oxygen delivery pipeline is used for delivering the oxygen to the user aerobic place.
In some embodiments, the particular value may be H 1 ＝h*(1-10％)，H 2 = h (= 1+ 10%), the flow value h varies according to the gear of the oxygen generator, for example, in some embodiments, h may be 0.2L/min for gear 1, and h is 1L/min for gear 5.
S (2) the main control module judges whether the duration T 'is equal to preset time T' 1 Generating a flow stabilization signal; specific T' 1 Which may be 200ms, with the duration of the oxygen burst in pulsed mode, typically 250ms, here 200ms, to allow for flow stabilization and subsequent ultrasound signal propagation and temperature data acquisition.
The flow sensor is arranged on an oxygen delivery pipeline between an oxygen generation unit (which can also be a gas storage tank, and the oxygen generation unit of a common portable oxygen generator comprises the gas storage tank) and a user aerobic place, and is used for detecting the flow of oxygen output by the oxygen generation unit and supplied to a user. The flow rate of oxygen can be stabilized in the less continuous oxygen supply stage, but before and immediately after this stage, because the flow has a process of changing from less to more and from more to less, the flow field of the flow is unstable, the attenuation to the ultrasonic wave in the oxygen concentration measuring tube is quite large, the accuracy of the acquired data for calculating the oxygen concentration is not high, and therefore, the step (2) is required to acquire the temperature value D when the flow rate is detected to be stable.
In the case of a stable gas flow, it is also more relevant to detect the time of flight of the ultrasonic signal emitted by the ultrasonic transducer in the gas, i.e. to detect the propagation time in the oxygen concentration measuring tube.
In order to consider various using states of a user, when the user does not carry the portable oxygen generator out and needs more oxygen, the portable oxygen generator can adopt a continuous oxygen supply mode through external alternating current. When a user considers that the oxygen generator is carried outdoors, the power consumption needs to be saved as much as possible, a pulse mode is adopted, oxygen is supplied only in a certain part of time period when the user inhales, and the proportion of the time in the whole respiratory cycle occupied by the inhaled oxygen which can be effectively utilized in the lung is studied in clinic and is not described herein again.
In the continuous oxygen supply mode, the oxygen flow in the oxygen supply pipeline is stable, so that a gas flow field in the oxygen concentration measuring pipe has no disorder state, the propagation condition of ultrasonic signals in the gas flow field is predictable, and the normal working voltage can meet the requirement of obtaining accurate measuring values.
However, in the pulse mode, the flow field of the gas in the oxygen delivery pipeline is more unstable, and since the ultrasonic signal is very sensitive to the state of the fluid flow field and is easily attenuated by the disordered flow field, the finally measured signal is inaccurate, and even if the flow is detected to be stable, the signal is collected again.
The ultrasonic signal is very sensitive to the state of the air flow, and in order to reduce the attenuation (because of air flow collision and interference) generated when the ultrasonic signal is transmitted in the air flow, the ultrasonic transducer can have higher power when transmitting the signal, so that the generated energy is larger, and the condition that the information is inaccurate due to signal attenuation is reduced.
The increase of the supply voltage of the ultrasonic transducer can be started when a condition with a high probability of stable air flow is detected, because the ultrasonic wave is transmitted and then runs in the oxygen concentration measuring tube for a period of time, the ultrasonic energy with enough energy is prepared in advance, and the ultrasonic transducer is already at the voltage with enough to output the ultrasonic signal with enough energy once the main control module detects the stable air flow, so that the accuracy of collecting data in the ultrasonic signal transmission process is facilitated.
Next, as shown in fig. 3, before the flow stabilization signal is generated in step (2), i.e., in the case of a roughly constant flow, the supply voltage is raised in advance by the following steps:
s-a, judging whether the duration T 'reaches the preset time T' 2 Of which is T' 2 <T′ 1 If yes, generating a voltage boost signal, T' 2 May be T' 1 Two-thirds of the value T' 2 In order to raise the voltage in advance. T' 2 The setting of (1) is to make an instruction for increasing the supply voltage of the ultrasonic transducer before the main control module really determines that the airflow is stable, so as to ensure that when the flow H of the airflow meets H 1 <h<H 2 And reaches preset time T' 1 At this time, the ultrasonic wave running in the oxygen concentration measuring tube is already an ultrasonic wave of sufficient energy.
If not, continuing to detect and carrying out the duration T 'and the preset time T' 2 Real-time comparison of (1);
step S-b. In response to the voltage boost signal, boost the supply voltage of the ultrasonic transducer from V 0 To V ', where V' = V 0 *(1+a％)，V 0 Supplying a voltage to the transducer before boosting the voltage; in some embodiments, where 60 ≦ a ≦ 250 and a is an integer, specifically a may be 100,V 0 May be 3.3V;
after the voltage is boosted, the voltage is usually much higher than the rated voltage of the ultrasonic transducer, although an ultrasonic signal with more energy is obtained, the attenuation of the ultrasonic signal by the outside is relieved, and more accurate propagation time data is obtained, in order to protect the ultrasonic transducer and reduce the power consumption, when the voltage is not boosted (namely, the air flow is unstable and is not suitable for data collection), the voltage of the ultrasonic transducer should be reduced to V 0 。
Therefore, in some embodiments, after the step S-b of boosting the voltage to V', the method further comprises the steps of:
s-c, starting timing when the voltage supplied by the transducer is increased to V ', wherein the timing is t' h ；
Step S-d. Judging time t' h Whether or not to reach threshold value T' 1 -T′ 2 If yes, performing step S-e, if no, continuing to detect time t' h And judging whether the threshold value is reached or not;
although the voltage is raised in advance when the flow stability occurs at the large probability, it needs to be confirmed whether the "large probability" event is true at a certain specific time, that is, when the flow stability is required to be confirmed at a time node, the main control module needs to acquire and judge whether the flow stability is actually achieved, that is, the flow satisfies H 1 <h<H 2 。
In the continuous oxygen supply mode, since the concentration in the oxygen concentration measuring tube is stable without changing the gear, the voltage V 0 The requirement can be met, however, although the flow stability of the pulse mode can be identified, the pulse mode is still relatively unstable compared with the continuous feeding mode, so that the application of high voltage is more favorable for reducing the attenuation of the oxygen flow field to the ultrasonic signals, and more accurate data is obtained. In general, the oxygen generator can be switched between a continuous mode and a pulse mode according to the needs of users, and the two modes can be used for a long time by the users in different time periods, so that the oxygen concentration measuring tube can be always kept at the voltage V 0 The operation is carried out to meet the knowledge of the oxygen concentration of the user in any mode at any time.
Step S-e: judging whether the flow value H detected by the flow sensor is in the range H 1 <h<H 2 If yes, go to step S-f; if not, entering the step S-g;
step S-f: maintaining the supply voltage of the transducer at V', and determining whether the flow value H is within the preset range H every 3ms 1 <h<H 2 Within; if so, continuously maintaining the voltage as V', and continuously judging whether the voltage is in a preset range at intervals; if not, entering the step S-g;
step S-g: generating a voltage recovery signal, the master control module controlling the supply voltage of the transducer back to V in response to the voltage recovery signal 0 And returning to the step (1) to continue monitoring whether the flow is stable or not
The main control module continuously monitors whether the flow h is stable or not, and timely returns to a low voltage state once instability is detected under a set condition.
In the step S (3), the main control module responds to the flow stabilization signal to obtain a temperature value D detected by the temperature sensor at this time; temperature is a significant parameter affecting the accuracy of ultrasonic measurement, and when the temperature changes, the propagation speed of ultrasonic waves also changes, resulting in different ultrasonic concentration measurement results. After the temperature is collected, the time required for the ultrasonic waves to pass through the medium in a certain gas flow state in the oxygen concentration measuring tube is also collected.
The fitting equation is as follows:
A＝a*D；
B＝b*T 0 ；
C＝c*D 2 ；
D＝d*D*T；
E＝e*D 3 ；
F＝f*D 2 *T 0 ；
m concentration = n + a + B + C + D + E + F;
wherein a, b, c, d, e, f and n are all preset coefficients of the fitting equation.
In order to ensure that the measured value in the data is more accurate and reduce the interference of external factors to the data, the structure improvement of the measuring system is further included in some embodiments. As shown in fig. 4 to 6, the oxygen concentration measuring tube 1 is mounted on the circuit board 2, the tube body is fixed on the circuit board 2 by bolts 24, two ultrasonic transducers a31 and B32 are oppositely arranged in the tube body end to end, an opening a11 is arranged on the side of the oxygen concentration measuring tube 1 close to the circuit board 2, the edge of the opening a11 extends outwards until abutting against the surface of the circuit board 2, and the joint of the outwards extending part of the edge of the opening a11 and the surface of the circuit board is sealed. In some embodiments, the sealing arrangement may be a sealing arrangement by a sealing ring 21, or a sealing arrangement between an outward extending portion of the edge of the opening a11 and the surface of the circuit board 2 by a sealing glue; the temperature sensor 4 is attached to the circuit board 2, and the temperature sensor 4 is positioned in the space of the extending part of the opening A11 of the oxygen concentration measuring tube 1. Through the sealed arrangement, the accuracy of the temperature sensor for detecting the temperature in the oxygen concentration measuring pipe is ensured, and the interference of the temperature of the outside air on the temperature sensor is reduced as much as possible.
In the prior art, the temperature sensor is vertically arranged in the center of the oxygen concentration measuring pipe for temperature detection, although the measured temperature is accurate because of the direct insertion into the middle of the air flow, the volume space of the oxygen concentration measuring pipe arranged in the portable oxygen generator is smaller, the volume of the temperature sensor relative to the measuring pipe is not small, the signal emitted by the ultrasonic transducer A, B in the oxygen concentration measuring pipe can be blocked or disturbed by the temperature sensor vertically arranged in the middle, the attenuation in the ultrasonic signal propagation process is increased, and the obtained ultrasonic propagation time is more inaccurate.
The improvement is that the temperature sensor is attached to the PCB, so that the interference and attenuation of the temperature sensor to the ultrasonic signal in the propagation process are reduced to the maximum extent, and the accuracy of ultrasonic signal detection is further improved.
Structurally, seted up opening B12 on oxygen concentration surveys buret 1, opening B12 is linked together with the head end of a diffuser pipe 5, the tail end and the oxygen therapy pipeline of diffuser pipe 5 are linked together, specifically are air inlet 52 and gas outlet 53 seted up to the tail end of diffuser pipe 5, and oxygen comes from air inlet 52 entering diffuser pipe 5 from gas holder or system oxygen unit, spouts to the user from gas outlet 53 again, and diffuser pipe 5 is arranged in communicating the oxygen on the oxygen therapy pipeline to oxygen concentration surveys buret 1, and the oxygen that gets into in the diffuser pipe 5 passes through diffusion channel 51 and the gaseous emergence diffusion of oxygen concentration survey buret 1 inside, the oxygen therapy pipeline is used for communicateing system oxygen unit and user, system oxygen unit is used for making oxygen.
The positional arrangement of the diffuser pipe 5 relative to the oxygen concentration measuring pipe 1 and its internal structural arrangement play an important role in the fluid state of the gas flow. In order to make the gas flow entering the oxygen concentration measuring tube 1 as stable as possible, the diffusion tube 5 is internally provided with diffusion channels 51 for communicating the head and tail ends of the diffusion tube 5;
as shown in fig. 7, in some embodiments, the diffusion passage 51 is 1 or more zigzag passages to increase the resistance of the gas directly rushing into the oxygen concentration measuring tube 1, so that it is possible to change the oxygen concentration in the oxygen concentration measuring tube 1 by the action of diffusion;
or in other embodiments, a plurality of layers of hollow baffles are arranged in the diffusion channel 51, and the hollow holes of each layer of hollow baffles are staggered; or in other embodiments, the diffusion channel 51 is a plurality of straight channels (not shown).
Combine the stable detection of air current to generate flow stabilization signal, dual stable assurance for when detecting with ultrasonic signal in the oxygen concentration survey buret 1, the air current fluid state is not disorderly, and is minimum to ultrasonic signal attenuation, and the result that obtains is more accurate.
In some embodiments, the temperature sensor 4 is of an SOP package structure, and its pin is exposed to the outside, which is favorable for accurate detection of ambient temperature, and is directly attached to the circuit board.
As shown in fig. 8, in order to further ensure the accuracy of the detection result, in some embodiments, the circuit board 2 around the temperature sensor 4 is provided with exposed copper sheets 22, the copper sheets 22 are located within a range enclosed by the outward extending portion of the edge of the opening a11, and the number of the copper sheets 22 is greater than or equal to 1. By utilizing the good heat conduction property of the copper sheet, the accuracy of sensing the ambient temperature by the temperature sensor is improved. Meanwhile, the copper sheet is arranged on the circuit board and in the oxygen concentration measuring tube, so that the temperature in the measuring tube can be sensed as much as possible. Specifically, the copper sheet can be arranged around the temperature sensor, and the copper sheet can be arranged at the position as many as possible outside the temperature sensor within the sealing position of the oxygen concentration measuring tube and the circuit board.
As shown in fig. 8 and 9, because other components are disposed on the circuit board, heat may be generated during operation, and in order to reduce interference of the heat on information collected by the temperature sensor, in some embodiments, a plurality of hollow-outs 23 are disposed on the circuit board 2 around the temperature sensor 4, and the hollow-outs 23 are located around the outer periphery of the outward extending portion of the edge of the opening a11, so as to isolate heat generated by other components on the circuit board from the area where the temperature sensor is located as much as possible, thereby greatly reducing heat generated by other components on the circuit board during operation from being conducted to the temperature sensor, and increasing accuracy of temperature detection in the oxygen concentration measuring tube.
In order to reduce the ability of the circuit board at the position of the temperature sensor to absorb the temperature in the surrounding air, in some embodiments, no copper sheet is disposed on the other side of the circuit board at the position of the temperature sensor, and also on the area of the circuit board 2 corresponding to the back mirror image of the area where the oxygen concentration measuring tube 1 is in sealing contact with the circuit board 2. In the area surrounded by the hollows, the oxygen concentration measuring tube is sealed, the circuit board is used as a symmetrical surface, and a copper sheet (not shown in the figure) is not arranged in the area of the other surface of the circuit board corresponding to the mirror image, so that the heat of surrounding elements is prevented from being conducted to the position near the temperature sensor 4 by the copper sheet on the back surface to influence the accuracy of the temperature measurement of the oxygen concentration measuring tube, and the accuracy of the result is ensured.
The interference of the back surface influenced by the surrounding environment to the temperature of the oxygen concentration measuring tube measured by the temperature sensor is reduced as much as possible, and the accuracy of temperature detection is improved.
The following is the application of the above method in a specific scenario to verify the validity of the method.
By adopting the method and the system in the application, namely the measuring system shown in figures 4-9 and the method shown in figures 1-3, the portable oxygen generator using the method is operated in plain areas with an altitude of 200m, the numerical value of the detected oxygen concentration is obtained under different gears, namely different flow rates, and meanwhile, the effectiveness of the improved method is verified by an external oxygen concentration measuring instrument at an oxygen outlet for supplying oxygen to users by the oxygen generator.
The results are given in table 1 for tests at different flow rates and at different temperatures.
Table 1: oxygen concentration measurement result verification table for oxygen generator
As can be seen from Table 1, the error between the oxygen concentration obtained by the oxygen generator and the value of the external oxygen concentration measuring instrument is controlled within acceptable 0.5% under different flow rates, and obviously, the detection result of the method is very accurate. Therefore, the method for measuring the concentration by the oxygen concentration measuring tube is structurally and algorithmically uniformly improved, and the effect is considerable.
In conclusion, the method provided by the application is used in a portable oxygen generator, firstly, the stability of oxygen flow is determined, data related to concentration calculation in an oxygen concentration measuring tube, such as the propagation time of temperature and ultrasonic signals, is obtained when the flow is stable, meanwhile, the system structure is improved on the basis of the method improvement, the position of a temperature sensor is arranged on a circuit board, the attenuation of ultrasonic signals in the propagation process is reduced, the accuracy of the propagation time is improved, meanwhile, the circuit board where the oxygen concentration measuring tube and the temperature sensor are arranged is sealed, the temperature measurement is not interfered by the external environment, meanwhile, hollows are arranged on the circuit board around the temperature sensor, the interference of heat generated when other components on the circuit board work on the temperature sensor is reduced, copper sheets are arranged on the surface of the circuit board on one side where the temperature sensor is arranged, the sensing capability of the temperature in the oxygen concentration measuring tube is enhanced, the accuracy of temperature detection is improved, meanwhile, no copper sheets are arranged on the back side (in a hollow area) where the circuit board where the temperature sensor is arranged, the copper sheets are not arranged, the temperature sensor is ensured to be influenced by the back side where the back of the back side where the components as little as possible, and the temperature measurement is further, and the accuracy of the heat generation in the temperature measurement in the oxygen concentration measurement is ensured.
Accurate temperature and ultrasonic wave propagation time data are obtained, and accurate oxygen concentration is obtained through calculation.
Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing detailed disclosure is to be considered merely illustrative and not restrictive of the broad application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.
Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.
Moreover, those skilled in the art will appreciate that aspects of the present application may be illustrated and described in terms of several patentable species or situations, including any new and useful combination of processes, machines, manufacture, or materials, or any new and useful improvement thereon. Accordingly, various aspects of the present application may be embodied entirely in hardware, entirely in software (including firmware, resident software, micro-code, etc.) or in a combination of hardware and software. The above hardware or software may be referred to as "data block," module, "" engine, "" unit, "" component, "or" system. Furthermore, aspects of the present application may be represented as a computer product, including computer readable program code, embodied in one or more computer readable media.
The computer storage medium may comprise a propagated data signal with the computer program code embodied therewith, for example, on baseband or as part of a carrier wave. The propagated signal may take any of a variety of forms, including electromagnetic, optical, etc., or any suitable combination. A computer storage medium may be any computer-readable medium that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code located on a computer storage medium may be propagated over any suitable medium, including radio, cable, fiber optic cable, RF, or the like, or any combination of the preceding.
Computer program code required for operation of various portions of the present application may be written in any one or more programming languages, including an object oriented programming language such as Java, scala, smalltalk, eiffel, JADE, emerald, C + +, C #, VB.NET, python, and the like, a conventional programming language such as C, visual Basic, fortran 2003, perl, COBOL 2002, PHP, ABAP, a dynamic programming language such as Python, ruby, and Groovy, or other programming languages, and the like. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any network format, such as a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet), or in a cloud computing environment, or as a service, such as a software as a service (SaaS).
Additionally, the order in which elements and sequences of the processes described herein are processed, the use of alphanumeric characters, or the use of other designations, is not intended to limit the order of the processes and methods described herein, unless explicitly claimed. While various presently contemplated embodiments have been discussed in the foregoing disclosure by way of example, it should be understood that such detail is solely for that purpose and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements that are within the spirit and scope of the embodiments herein. For example, although the system components described above may be implemented by hardware devices, they may also be implemented by software-only solutions, such as installing the described system on an existing server or mobile device.
Similarly, it should be noted that in the preceding description of embodiments of the application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. An ultrasonic oxygen concentration measuring method based on flow detection is characterized by comprising the following steps:
step 1, obtaining a temperature value D in an oxygen concentration measuring tube when the flow is stable, wherein the flow is stable in a pulse oxygen supply mode of a portable oxygen generator, and an oxygen generation unit continuously sprays oxygen to a user;
step 2, recording the time T used for the ultrasonic transducer A to transmit ultrasonic waves and the ultrasonic transducer B to receive ultrasonic signals 10 (ii) a And the time T for the ultrasonic transducer B to transmit ultrasonic waves and the ultrasonic transducer A to receive ultrasonic signals 20 Calculating T Average ＝(T 10 +T 20 ) The oxygen concentration measuring tube is internally and oppositely provided with an ultrasonic transducer A and an ultrasonic transducer B;
step 3, utilizing temperature values D and T Average And a fitting equation of temperature, time and concentration is constructed for real-time concentration calculation;
the specific implementation process of the step 1 is as follows:
step (1) obtaining a flow value H detected by a flow sensor, and judging whether H is in a preset range H 1 <h<H 2 When the judgment result is yes, recording the duration t' in the range;
step (2) judging whether the duration T 'is equal to a preset time T' 1 Generating a flow stabilization signal;
responding to the flow stability signal, and acquiring a temperature value D detected by the temperature sensor at the moment;
the flow sensor is arranged on an oxygen delivery pipeline between the oxygen generation unit and a user aerobic place;
and (3) before the flow stabilizing signal is generated in the step (2), the supply voltage of the ultrasonic transducer is increased.
2. The method according to claim 1, wherein the step of boosting the supply voltage of the ultrasonic transducer is realized by:
step a, judging that the duration T 'is equal to a preset time T' 2 Of (m), wherein T' 2 <T′ 1 Generating a voltage boost signal;
step b, responding to the voltage lifting signal, lifting the supply voltage of the ultrasonic transducer from V 0 To a preset V ', where V' = V 0 *(1+a％)，V 0 The voltage is supplied to the transducer before the voltage is boosted, wherein a is more than or equal to 10 and less than or equal to 20, and a is an integer.
3. The method according to claim 1 or 2, characterized in that: in step 3, the fitting equation is:
A＝a*D；
B＝b*T 0 ；
C＝c*D 2 ；
D＝d*D*T；
E＝e*D 3 ；
F＝f*D 2 *T 0 ；
m concentration = n + a + B + C + D + E + F;
wherein a, b, c, d, e, f and n are all preset coefficients of the fitting equation.
4. Ultrasonic wave oxygen concentration measurement system based on flow measurement, its characterized in that: comprises the steps of (a) preparing a substrate,
a circuit board; and a process for the preparation of a coating,
the temperature sensor is attached to the circuit board and used for detecting the oxygen temperature; and a process for the preparation of a coating,
an oxygen concentration measuring tube fixed on the circuit board and provided with an opening A and an opening B, wherein the edge of the opening A extends downwards to be abutted against the surface of the circuit board, and the temperature sensor is arranged in the range formed by the edge of the opening A; and a process for the preparation of a coating,
one end of the diffusion pipe is communicated with the opening B, the other end of the diffusion pipe is communicated with an oxygen delivery pipeline, the oxygen delivery pipeline is used for communicating an oxygen generation unit and a user aerobic place, and the oxygen generation unit is used for generating oxygen; and a process for the preparation of a coating,
the ultrasonic transducer A and the ultrasonic transducer B are oppositely arranged in the oxygen concentration measuring tube and are alternately used for transmitting and receiving ultrasonic signals;
a master control module for performing the method of any one of claims 1 to 3; and the temperature sensor, the ultrasonic transducer A and the ultrasonic transducer B are in communication connection with the main control module.
5. The measurement system of claim 4, wherein: the diffusion channel is arranged in the diffusion tube and is used for communicating the head end and the tail end of the diffusion tube;
the diffusion channel is 1 or more zigzag channels;
or a plurality of layers of hollow baffles are arranged in the diffusion channel, and hollow holes of each layer of hollow baffles are staggered with each other;
or the diffusion channel is a plurality of straight channels.
6. The measurement system of claim 5, wherein: exposed copper sheets are arranged on the circuit board at the periphery of the temperature sensor, the copper sheets are positioned in the range enclosed by the outward extending part of the edge of the opening A, and the number of the copper sheets is more than or equal to 1.
7. Oxygen system, its characterized in that: comprising an oxygen generation unit for producing oxygen, an oxygen delivery line for delivering oxygen from the oxygen generation unit to a user's oxygen demand, and the ultrasonic oxygen concentration measurement system based on flow rate detection according to any one of claims 4 to 6.
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