阅读说明：本技术 基于压力检测的超声波氧浓度测量方法、系统和制氧系统 (Ultrasonic oxygen concentration measuring method and system based on pressure detection and oxygen generation system ) 是由 张本荣 褚昌鹏 肖武 于 2020-12-31 设计创作，主要内容包括：本发明涉及便携式制氧机中氧气浓度测量技术领域,特别涉及一种基于压力检测的超声波氧浓度测量方法、系统和制氧系统,具体包括：获取流量稳定时的氧浓度测量管内的温度值D,流量稳定时,是指输氧管路中气压为零值时,输氧管路设置于制氧单元和用户需氧处之间,制氧单元用于制造氧气；在流量稳定时,主控模块获取氧浓度测量管内超声波信号的传播时间T；利用温度值D和T,以及温度、时间和浓度构建的拟合方程实时计算的输氧管路中氧气的浓度；系统中的温度传感器设置于电路板上,且温度传感器周围设置有裸露铜片。本发明方法和系统,相对于现有技术,在进行氧浓度测量的数据采集中,保证了数据更准确,最后氧浓度的测量结果也更加准确。(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 pressure detection and an oxygen generation system, and the method specifically comprises the following steps: acquiring a temperature value D in an oxygen concentration measuring pipe when the flow is stable, wherein the flow is stable and the pressure in an oxygen pipeline is zero, the oxygen pipeline is arranged between an oxygen generation unit and a user aerobic part, and the oxygen generation unit is used for generating oxygen; when the flow is stable, the main control module obtains the propagation time T of the ultrasonic signal in the oxygen concentration measuring tube; calculating the concentration of oxygen in the oxygen delivery pipeline in real time by using a fitting equation constructed by the temperature values D and T and the temperature, the time and the concentration; a temperature sensor in the system is arranged on a circuit board, and a bare copper sheet is arranged around the temperature sensor. Compared with the prior art, the method and the system ensure more accurate data and more accurate measurement result of the oxygen concentration in the data acquisition of the oxygen concentration measurement.)

1. The ultrasonic oxygen concentration measuring method based on pressure detection is characterized by comprising the following steps of:

step 1, obtaining a temperature value D in an oxygen concentration measuring pipe when the flow is stable, wherein when the flow is stable, the pressure in an oxygen delivery pipeline is zero, the oxygen delivery pipeline is used for communicating an oxygen generation unit and a user aerobic part, and the oxygen generation unit is used for generating oxygen;

step 2, when the flow is stable, the main control module obtains the propagation time T of the ultrasonic signal in the oxygen concentration measuring tube;

and 3, calculating the concentration of the oxygen in the oxygen delivery pipeline in real time by using a fitting equation constructed by the temperature values D and T and the temperature, the time and the concentration.

2. The method of claim 1, wherein: the specific implementation process of the step 1 is as follows:

step 1.1, acquiring an air pressure value in an oxygen delivery pipeline, and starting timing t when the air pressure value is judged to be subjected to a negative value → a first positive value → a first zero value, wherein the air pressure value in the oxygen delivery pipeline is an air pressure value detected by a breathing sensor arranged in the oxygen delivery pipeline, and the air pressure value is detected to be a negative value when a user inhales; when the first positive value is detected, the oxygen generation unit supplies oxygen to a user; when the first zero value is detected, after the oxygen supply for the oxygen generator to the user is finished, no airflow flows in the oxygen supply pipeline;

step 1.2 judging when the time T reaches the preset first time T₁Generating a flow stabilization signal;

step 1.3, responding to the flow stability signal, and acquiring a temperature value D in the oxygen concentration measuring tube.

3. The method of claim 2, wherein: before the acquisition T in the step 2, the method further comprises the following steps:

step 2.1 when the pressure value of the respiration sensor is detected to be negative → first positive → first zero → second positive, timing t is started₀When t is judged₀Equal to the preset second time T₂Generating a voltage boosting signal, and when the respiration sensor detects a second positive value, the breath is the breath action of the user;

step 2.2 raising the supply voltage V of the ultrasonic transducers A and B in response to the voltage-raising signal₀To a predetermined voltage value V_h，V₀The voltage is supplied to the transducer before the voltage is boosted.

4. The method of claim 3, wherein: in step 3, the fitting equation is:

A＝a*D；

B＝b*T₀；

C＝c*D²；

D＝d*D*T；

E＝e*D³；

F＝f*D²*T₀；

the concentration of M is n + A + B + C + D + E + F;

wherein a, b, c, d, e, f and n are constant coefficients of the fitting equation.

5. Ultrasonic wave oxygen concentration measurement system based on pressure measurement, its characterized in that: comprises that

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 4;

and the temperature sensor, the ultrasonic transducer A and the ultrasonic transducer B are in communication connection with the main control module.

6. The system of claim 5, 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.

7. The system of claim 6, 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.

8. Oxygen system, its characterized in that: the ultrasonic oxygen concentration measurement system based on pressure detection comprises an oxygen generation unit, an oxygen delivery pipeline and the ultrasonic oxygen concentration measurement system based on pressure detection, wherein the oxygen generation unit is used for generating oxygen, and the oxygen delivery pipeline is used for communicating the oxygen generation unit with a user aerobic place.

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 pressure 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.

In the prior art, an oxygen concentration measuring tube is usually arranged on an oxygen delivery pipeline, oxygen delivered to a user is delivered to the user after passing through the oxygen concentration measuring tube, and the oxygen concentration in the tube is calculated by using the propagation time of an ultrasonic signal in the oxygen concentration measuring tube and temperature data in the oxygen concentration measuring tube. Therefore, the accuracy of the time data and the temperature data is directly related to the accuracy of the oxygen concentration.

In the oxygen concentration survey buret, among the ultrasonic signal transmission process, flow field state to its fluid of process is very sensitive, when intraductal oxygen air current is disorderly and disorderly, can cause great decay to the ultrasonic wave, when leading to the ultrasonic wave that launches from the transducer to reach the receiving terminal, the operating time data that obtains of detection is inaccurate, simultaneously, set up the temperature sensor in the oxygen concentration survey buret, it is more accurate for the testing result, some directly set up it in the oxygen concentration survey buret, some stand in the centre of body, but set up like this and cause the decay when extremely easily spreading ultrasonic signal, lead to time data to detect inaccurately, and then the oxygen concentration that the calculation obtained is inaccurate.

Disclosure of Invention

According to the defects of the prior art, the invention provides a measuring method, a measuring system and an oxygen generating system, which can more accurately measure the oxygen concentration in a portable oxygen generator.

One aspect of the present application provides an ultrasonic oxygen concentration measurement method based on pressure detection, including the following steps:

step 1, obtaining a temperature value D in an oxygen concentration measuring pipe when the flow is stable, wherein when the flow is stable, the pressure in an oxygen pipeline is zero, the oxygen pipeline is arranged between an oxygen generation unit and a user aerobic part, and the oxygen generation unit is used for generating oxygen;

step 2, when the flow is stable, the main control module obtains the propagation time T of the ultrasonic signal in the oxygen concentration measuring tube;

and 3, calculating the concentration of the oxygen in the oxygen delivery pipeline in real time by using a fitting equation constructed by the temperature values D and T and the temperature, the time and the concentration.

Further, the specific implementation process of step 1 is as follows:

step 1.1, acquiring an air pressure value in an oxygen delivery pipeline, and judging that timing t begins when the air pressure value undergoes a negative value → a first positive value → a first zero value, wherein the air pressure value in the oxygen delivery pipeline is the air pressure value detected by a breathing sensor arranged in the oxygen delivery pipeline, when the air pressure value is detected to be the negative value, the air pressure value is the air pressure value detected by a user, when the air pressure value is detected to be the negative value, an oxygen generation unit supplies oxygen to the user when the first positive value is detected, and when the first zero value is detected, the air pressure value is the air pressure value when no air flow flows in the oxygen delivery pipeline after the oxygen supply of the;

step 1.2 judging when the time T reaches the preset first time T₁Generating a flow stabilization signal;

step 1.3, responding to the flow stability signal, and acquiring a temperature value D in the oxygen concentration measuring tube.

Further, acquisition T in step 2_AverageBefore, still include the step:

step 2.1 when the pressure value of the respiration sensor is detected to be negative → first positive → first zero → second positive, timing t is started₀When t is judged₀Equal to the preset second time T₂Generating a voltage boosting signal, and when the respiration sensor detects a second positive value, the breath is the breath action of the user;

step 2.2 raising the supply voltage V of the ultrasonic transducers A and B in response to the voltage-raising signal₀To a predetermined voltage value V_h，V₀Supplying a voltage to the transducer before boosting the voltage;

further, in step 3, the fitting equation is:

A＝a*D；

B＝b*T₀；

C＝c*D²；

D＝d*D*T；

E＝e*D³；

F＝f*D²*T₀；

the concentration of M is n + A + B + C + D + E + F;

wherein a, b, c, d, e, f and n are constant coefficients of the fitting equation.

On the other hand, the application also provides an ultrasonic oxygen concentration measuring system based on pressure 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 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 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 still another aspect, the present application further provides an oxygen generation system, including an oxygen generation unit, an oxygen delivery pipeline and the ultrasonic oxygen concentration measurement system based on pressure detection as described in any one of the above, the oxygen generation unit is used for making oxygen, and the oxygen delivery pipeline is used for communicating the oxygen generation unit and a user oxygen demand place.

The invention has the following beneficial effects: (1) the method comprises the steps of collecting oxygen concentration when oxygen flow is stable, reconstructing a fitting equation under the condition, and calculating the concentration, wherein compared with the condition that whether measured gas is stably output or not in the prior art, the obtained data is more accurate, and the calculated oxygen concentration value is closer to a real numerical value; (2) the method comprises the steps of firstly testing whether the oxygen flow is stable or not, and acquiring data required in the oxygen concentration measurement process only when the obtained oxygen flow meets the preset stable condition, so that the accuracy of the data in the oxygen concentration calculation process is greatly improved; (3) according to the method, after the expiration of a user is finished, the supply voltage of the transducer is increased in advance before the next inspiration starts, so that the transmitting power of the ultrasonic transducer is increased, the preparation is made for formal measurement, the attenuation caused by the collision of oxygen flow when an ultrasonic signal is transmitted in the oxygen concentration measuring tube is reduced, and the accuracy of the ultrasonic signal received by the ultrasonic transducer is improved; (4) the temperature sensor is attached to the circuit board and arranged in the oxygen concentration measuring tube, so that the circuit is convenient to mount, meanwhile, the surface, close to the inner part of the oxygen concentration measuring tube, of the circuit board around the temperature sensor is provided with the copper sheets, the sensing force of the temperature sensor on the temperature in the oxygen concentration measuring tube is increased, the accuracy of temperature detection is improved, the defect that the temperature sensor cannot stand in the ultrasonic propagation path of the oxygen concentration measuring tube for gas measurement like a vertical temperature sensor is well overcome, and the temperature of the gas in the oxygen concentration measuring tube can be sensed in time;

in conclusion, the measuring method, the measuring system and the oxygen generation system provided by the invention improve the factors which can influence the numerical accuracy in the oxygen concentration measurement, so that the obtained data is more accurate, the final oxygen concentration calculation result is more accurate, and the use experience of a user is greatly improved.

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 illustrating a method for raising the supply voltage of the ultrasonic transducer in advance according to the method of the present invention;

FIG. 4 is a schematic flow chart diagram illustrating an embodiment of the present invention;

FIG. 5 is a schematic perspective view of a combination of a circuit board, an oxygen concentration measurement tube and a diffuser tube according to an embodiment of the present invention;

FIG. 6 is a schematic view of a first perspective view of an oxygen concentration measuring tube according to an embodiment of the present invention;

FIG. 7 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 invention;

FIG. 8 is an enlarged, partially cross-sectional view of portion A of FIG. 7

FIG. 9 is a schematic structural diagram of a circuit board with a hollow, a temperature sensor and a bare copper sheet according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a second perspective view of a combination of a circuit board, an oxygen concentration measurement tube and a diffuser tube in 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):

as shown in fig. 1, the present invention provides an ultrasonic oxygen concentration measurement method based on pressure detection, which is used for more accurately measuring the oxygen production concentration in an oxygen generator. The ultrasonic concentration measurement is characterized by being 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.

As shown in fig. 1, it is more accurate to first determine that the gas flow is stable and then to collect the parameters of the ultrasonic wave propagation in the gas. The portable oxygen generator is 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 a program can be also set in the main control module and is used for sending control signals and responding certain signals to make new control signals. The master control module is communicatively coupled to the ultrasonic transducer A, B and the temperature sensor.

The method provided by the application comprises the following steps:

step 1, a main control module obtains a temperature value D in an oxygen concentration measuring pipe when the flow is stable, wherein when the flow is stable, the pressure in an oxygen delivery pipeline is zero, the oxygen delivery pipeline is arranged between an oxygen generation unit and a user aerobic part, and the oxygen generation unit is used for generating oxygen;

firstly, when the main control module judges that the flow is stable, because no oxygen flows in the oxygen delivery pipeline after the oxygen supply to the user is finished, at the moment, no excessively disordered air flow of a flow field exists in the oxygen concentration measuring pipe, the attenuation to the ultrasonic wave signal is minimum, and the obtained time data of ultrasonic wave propagation is accurate.

In some embodiments, in the pulse mode of the portable oxygen generator, the method for determining whether the flow is stable and collecting the temperature value D is shown in fig. 2, that is, the specific implementation process of step 1 is as follows:

s1.1, a main control module acquires an air pressure value in an oxygen delivery pipeline, and starts to time t when the air pressure value is judged to be subjected to negative value (inhalation) → first positive value (spraying) → first zero value (stable); the main control module acquires signals detected by the respiration sensor, judges and records positive and negative zero values of the signals, and starts timing when preset conditions are reached. The air pressure value in the oxygen delivery pipeline is the air pressure value (used for detecting the air pressure in the oxygen delivery pipeline) detected by a breathing sensor arranged in the oxygen delivery pipeline, when the air pressure value is detected to be a negative value, the air pressure value is the inhalation action of a user, and when a first positive value is detected, the oxygen generation unit supplies oxygen to the user; when the first zero value is detected, the oxygen supply to the user by the oxygen generator is finished and the user exhales;

s1.2 the main control module judges that the time T reaches the preset first time T₁Generating a flow stabilization signal; first time T₁In order to provide a stable time for the gas flow in the oxygen concentration measuring tube, although the respiration sensor detects that the pressure value in the oxygen delivery line is from a first positive value (spraying) → a first zero value (stable), and no gas flow exists in the oxygen delivery line, the first time T is waited for₁The interval time can ensure that the air flow in the oxygen pipeline is more stable. But must guarantee a "first time T₁And "will not be in the next expiratory effort time of the user. The breathing sensor may sense a positive value during the exhalation maneuver after the user inhales. A first time T based on empirical values from multiple tests₁May be set to 50 ms.

S1.3 the main control module responds to the flow stabilization signal to obtain a temperature value D in the oxygen concentration measuring tube.

Usually, a user breathes for a certain period, and the oxygen spraying of the oxygen generating unit in the pulse mode is stopped for a certain time after the oxygen spraying of the user. A breathing sensor is arranged in the oxygen delivery pipeline and used for collecting the breath of a user and determining the breathing frequency. When the flow is stable, the temperature and other acquisition related to concentration calculation is carried out, and the finally obtained concentration calculation is more accurate.

Step 2, when the flow is stable, the main control module obtains the propagation time T of the ultrasonic signal in the oxygen concentration measuring tube, and in some embodiments, the time T may be T_Average，T_AverageCan be obtained by the following steps: the main control module controls the ultrasonic transducer A to transmit an ultrasonic signal and the ultrasonic transducer B to receive the ultrasonic signal transmitted by the transducer A, and records the time T from transmission to reception₁₀(ii) a The main control module controls the ultrasonic transducer B to transmit ultrasonic waves, the ultrasonic transducer A receives signals transmitted by the ultrasonic transducer B, and the time T from transmission to reception is recorded₂₀Calculating T_Average＝(T₁₀+T₂₀) The oxygen concentration measuring tube is internally and oppositely provided with an ultrasonic transducer A and an ultrasonic transducer B; the two ultrasonic transducers alternately receive and transmit ultrasonic signals, and time averaging is carried out, so that a parameter value which is as real as possible can be better obtained.

In other embodiments, time T may also be a single pass propagation time from the occurrence of ultrasonic transducer a to the reception of B, or vice versa.

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 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 any more.

However, in the pulse mode, the flow field of the gas in the oxygen supply pipeline is more unstable, because 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, even if the breathing sensor does not detect the air pressure value, the pulse mode is intermittent oxygen spraying, the switching between the oxygen spraying state and the oxygen non-spraying state is frequent, the time for maintaining each state is short, even if the air pressure in the oxygen supply pipeline is zero, weak air flow exists (compared with the situation that the gas flow field is not stable enough in the continuous oxygen supply mode), so that after the expiration of a user is finished, the supply voltage of the transducer is increased in advance before the next inspiration is started, the transmitting power of the ultrasonic transducer is increased, the flow field is prepared for formal measurement, and the attenuation of the ultrasonic signal due to instability is reduced as much as possible, the obtained running time parameters are more accurate.

Therefore, in some embodiments, as shown in fig. 3, before the acquisition T in step 2, the following steps are further included to boost the energy of the signal emitted by the ultrasonic transducer A, B:

s2.1, when the pressure value of the respiration sensor is detected to be subjected to a negative value (inhalation of a user) → a first positive value (oxygen spraying of the oxygen generator to the user) → a first zero value (stable airflow in the oxygen delivery pipeline) → a second positive value (exhalation of the user), timing t is started₀When t is judged₀Equal to the preset second time T₂When, in particular, T₂Which may be 50ms, generates a voltage boost signal; the generation time of the voltage boost signal is 50ms, 50ms after the expiration of the user, and the boost of the pressure value of the ultrasonic transducer A, B is not performed in advance in the next breathing cycle, i.e., before the user's breathing cycle again.

S2.2 the main control module responds to the voltage boosting signal to boost the supply voltage V of the ultrasonic transducer A and the ultrasonic transducer B₀To a predetermined voltage value V_hAnd continuously recording at the voltage value V_hTime t of_h(ii) a Specific V_h＝V₀1+ a%) of which 60 is not less than a and not more than 250, and aIs an integer, specifically a may be 100, V₀Which may be 3.3V, different ultrasonic transducers A, B may have different nominal operating voltages, and a variety of options are available. In the pulse oxygen supply mode, the requirement of the user on oxygen is only in a certain part of the breathing cycle, so the measurement of the oxygen concentration in the oxygen concentration measurement tube is also divided into parts, and meanwhile, the possibility of increasing the supply voltage of the ultrasonic transducer, causing power consumption increase and prolonging the service life of the ultrasonic transducer is also considered, so after the supply voltage is increased in the step S2.2, if the condition that the user cannot continuously use the oxygen generator is detected, the supply voltage is reduced back to the original voltage, so that the power consumption is saved, and the service life loss of the ultrasonic transducer is reduced.

In some embodiments, as shown in fig. 4, after step 2.2, the process of detecting and dropping back to the original voltage may be a process including the following steps:

step SA records at voltage value V_hTime t of_h(ii) a That is, the time t is counted from the rise of the voltage_h

Step SB judging time t_hWhether the preset third time T is reached₃If not, continuously updating the time t_hAnd making a judgment; if yes, go to step SC.

The SC main control module judges whether a pressure value of the breathing sensor has a negative value (namely whether an inspiration state exists), if not, a voltage recovery signal is generated, the SD step is carried out, and if so, the SE step is carried out;

specific T₃Which may be one fifth of the entire breathing cycle. The specific breathing cycle can be monitored in real time according to the breathing sensor and calculated and adjusted through the main control module, and the calculation and adjustment method has more prior art at present and is not repeated;

step SD main control module responds to the voltage recovery signal to recover the supply voltage of the ultrasonic transducer A and the ultrasonic transducer B to V₀. In the pulse mode, the voltage is only raised when needed, and when the user cannot be detected to breathe, the user is probably in an oxygen-free state, and the original voltage should be recovered at the moment, so that the service life loss of the ultrasonic transducer can be reduced as much as possible. V₀The voltage is the voltage when ultrasonic transducer normally works, and can meet the requirement of concentration detection in a continuous oxygen supply mode (airflow is stable all the time).

And step SE returns to step 2.1, the state of the pressure value of the respiration sensor is continuously detected, and whether a voltage boost signal is generated or not is judged. I.e. if at time t_hDoes not reach the third time T₃The main control module obtains a signal that the breathing sensor detects a negative value (i.e. the inhalation state of the user), and the detection is required to be continued from step 2.1.

Finally, the process of calculating the oxygen concentration from the collected data is, step 3, using the temperature values D and T_AverageAnd fitting equations constructed for temperature, time and concentration for real-time concentration calculations. By collecting multiple sets of D and T in steps 1 and 2_AverageAnd carrying out concentration acquisition at the same moment at an oxygen spraying port of the oxygen delivery pipeline by using an external oxygen concentration measuring instrument, fitting a plurality of groups of data, constructing a fitting equation, writing the fitting equation into the main control module in the form of an operating program, and carrying out real-time calculation in the portable oxygen generator.

The fitting equation is as follows:

A＝a*D；

B＝b*T₀；

C＝c*D²；

D＝d*D*T；

E＝e*D³；

F＝f*D²*T₀；

the concentration of M is n + A + B + C + D + E + F;

wherein a, b, c, d, e, f and n are constant 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 on the data, the application also provides an ultrasonic oxygen concentration measuring system based on pressure detection, and the structure of the measuring system is improved. In some embodiments, as shown in fig. 5 and 7, 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, and two ultrasonic transducers a31 and B32 are arranged in the tube body end to end, as shown in fig. 5 and 6, 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, the outwards extending part of the edge of the opening a11 is sealed with the surface of the circuit board 2 by a sealing ring 21, or the outwards extending part of the edge of the opening a11 is sealed with 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 located in a space extending from the opening a11 of the oxygen concentration measuring tube 1. Through sealed setting, guaranteed the accuracy that temperature sensor detected the temperature in the oxygen concentration measuring tube, reduced the interference of outside air's temperature to temperature sensor as far as.

In the prior art, the temperature sensor is vertically arranged in the center of the oxygen concentration measuring tube for temperature detection, although the measured temperature is accurate because of the middle of the direct insertion of the air flow, the volume space of the oxygen concentration measuring tube arranged in the portable oxygen generator is smaller, the temperature sensor is not small relative to the volume of the measuring tube, the signal emitted by the ultrasonic transducer A, B in the oxygen concentration measuring tube 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, opening B12 has been seted up on oxygen concentration survey buret 1, opening B12 is linked together with the head end of a diffusion tube 5, the tail end and the oxygen therapy pipeline of diffusion tube 5 are linked together, specifically air inlet 52 and gas outlet 53 have been seted up to the tail end of diffusion tube 5, oxygen comes from air inlet 52 entering diffusion tube 5 from gas holder or system oxygen unit, spout to the user from gas outlet 53 again, diffusion tube 5 is arranged in will communicating the oxygen on the oxygen therapy pipeline to oxygen concentration survey buret 1, the oxygen that gets into in the diffusion tube 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, a diffusion channel 51 is arranged inside the diffusion tube 5 and is used for communicating the head end and the tail end of the diffusion tube 5;

as shown in fig. 8, 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 inside 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 adopts an SOP package structure, which reduces the impact on the ultrasonic signal in the tube and the attenuation of the ultrasonic signal in the propagation process, compared with the prior art in which the temperature sensor is inserted in the middle of the oxygen concentration measuring tube, and is beneficial to smooth propagation of the ultrasonic signal and the accuracy of the obtained propagation time; .

As shown in fig. 9, 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 surrounded 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, and the temperature in the measuring tube is 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. 10, 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 parts 23 are further disposed on the circuit board 2 around the temperature sensor 4, the hollow parts 23 are disposed on the periphery of the outward extending portion of the edge of the opening a11, and the hollow parts 23 isolate heat generated by other components on the circuit board from the region where the temperature sensor is located as much as possible, thereby increasing accuracy of temperature detection in the oxygen concentration measuring tube.

In order to reduce the temperature sensor's ability to absorb ambient air, in some embodiments, no copper sheet is disposed on the other side of the circuit board, i.e., on the area of the circuit board corresponding to the back mirror image of the area where the oxygen concentration measuring tube 1 and the circuit board 2 are in sealing contact. The area that can be enclosed at the fretwork is in the oxygen concentration survey buret seal zone to the circuit board is the plane of symmetry, and the mirror image is corresponding in the area of the another side department of circuit board, does not set up copper sheet (not shown in the figure), reduces the sensitivity that this back received the influence of air temperature as far as, reduces the interference to temperature sensor measurement oxygen concentration survey buret temperature after this back receives the surrounding environment influence as far as possible, has increased the accuracy that the temperature detected.

The following is the application of the above method in a specific scenario to verify the validity of the method.

In plain areas with an altitude of 200 m, the portable oxygen generator using the structure shown in fig. 7 and the method shown in fig. 4 is operated, the value of the detected oxygen concentration is obtained at different gears, namely different flow rates, and 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, under different flow rates, the numerical errors of the oxygen concentration obtained by the oxygen generator and the external oxygen concentration measuring instrument are controlled within acceptable 0.5%, and obviously, the detection result of the method is 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 improvement of the method, the position of a temperature sensor is arranged on a circuit board, the attenuation of the ultrasonic signals in the propagation process is reduced, the accuracy of the propagation time is improved, meanwhile, the circuit board at the positions of the oxygen concentration measuring tube and the temperature sensor is sealed, the temperature measurement is ensured not to be interfered by the external environment, meanwhile, hollowing is 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, and a bare copper sheet is arranged on the surface of the circuit board at one side of the temperature sensor, the sensing ability of the temperature in the oxygen concentration measuring tube is enhanced, the accuracy of temperature detection is improved, and meanwhile, no copper sheet is arranged on the back surface (the area surrounded by the hollow parts) of the circuit board where the temperature sensor is located, so that the temperature sensor is guaranteed to be influenced by the heat production of the back component as small as possible, and the accuracy of temperature detection in the oxygen concentration measuring tube is further guaranteed.

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 the 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.