CN117679011A - Gas flow detection device - Google Patents
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 8
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Abstract
The embodiment of the application belongs to the field of medical equipment, and relates to a gas flow detection device for respiratory diagnosis equipment, comprising: the device comprises an airflow pipeline, a processing module, a differential pressure flow sensor and an ultrasonic flow sensor; the air flow pipeline is provided with a differential pressure flow sensor and a flow sensing element of an ultrasonic flow sensor; after the detected air flow is input into the air flow pipeline, the differential pressure data is generated by the differential pressure flow sensor and reported to the processing module, and the time difference data is generated by the ultrasonic flow sensor and reported to the processing module; the processing module is used for determining the flow value of the detected air flow by adopting the differential pressure data when judging that the flow of the detected air flow is smaller than the first flow threshold value according to the differential pressure data and the time difference data; and when judging that the flow rate of the detected airflow is greater than or equal to a second flow rate threshold value, determining the flow rate value of the detected airflow by adopting time difference value data, wherein the second flow rate threshold value is greater than or equal to the first flow rate threshold value. When the high-flow test precision is met, the low-flow test precision can be considered at the same time.
Description
Technical Field
The application relates to the technical field of medical equipment, in particular to a gas flow detection device.
Background
In recent years, respiratory diseases in China, such as bronchial asthma, chronic obstructive pulmonary disease and the like, are gradually increased, and clinical application of lung function examination can discover and assist diagnosis of etiology as early as possible, so that standardized treatment can be conveniently carried out in time, and economic burden and physical burden of patients are reduced.
In the application requirements of the lung function test, the measurement core technology of the lung ventilation detection is the gas flow sensor technology. The gas flow sensor is not only applied to the detection of the pulmonary ventilation function, but also applied to the test items such as the detection of the pulmonary capacity, the detection of the dispersion function, the detection of the respiratory compliance function and the like, and is a core component of the pulmonary function instrument.
At present, the detection of the gas flow needs to meet the flow measurement range from children to adults at the same time, and the flow measurement range reaches 0 to +/-1200L/min. The existing general flow sensors in the market, such as orifice plates, hot wires, turbine type, ultrasonic type and the like, are difficult to consider the small flow test precision when the large flow test precision is met. For example, with respect to the pulmonary ventilation function, it is difficult for the current respiratory flow detection technology to solve the problem of insufficient flow measurement accuracy in both cases of small and slow flow detection and rapid respiration and rapid flow detection of instantaneous rapid changes of forced respiration when the patient uses force to exhale and force to inhale the end in the pulmonary ventilation function test.
Disclosure of Invention
An object of the embodiment of the application is to provide a gas flow detection device, through adopting differential pressure flow sensor and ultrasonic flow sensor to carry out flow detection simultaneously to when satisfying high-traffic test accuracy, can compromise low-traffic test accuracy simultaneously, solved among the prior art high-traffic measuring accuracy and low-traffic measuring accuracy be difficult to compromise simultaneously technical problem.
To solve the above technical problem, an embodiment of the present application provides a gas flow detection device, where the gas flow detection device is used in a respiratory diagnosis apparatus, and the gas flow detection device adopts a technical scheme as follows, including:
the device comprises an airflow pipeline, a processing module, a differential pressure flow sensor and an ultrasonic flow sensor;
the air flow pipeline is provided with a differential pressure flow sensor and a flow sensing element of the ultrasonic flow sensor;
after the detected air flow is input into the air flow pipeline, the differential pressure flow sensor generates differential pressure data and reports the differential pressure data to the processing module, and the ultrasonic flow sensor generates time difference data and reports the time difference data to the processing module;
the processing module is used for determining the flow value of the detected air flow by adopting the pressure difference data when judging that the flow of the detected air flow is smaller than a first flow threshold value according to the pressure difference data and the time difference data; when the flow rate of the detected air flow is larger than or equal to a second flow rate threshold value according to the pressure difference data and the time difference data, the time difference data is adopted to determine the flow rate value of the detected air flow, and the second flow rate threshold value is larger than or equal to the first flow rate threshold value.
In some possible implementations, the gas flow detection device may further include an environmental sensor, and the processing module is further configured to perform compensation calibration on the flow value of the detected gas flow according to an environmental parameter detected by the environmental sensor, where the environmental sensor may include an environmental temperature sensor, an environmental pressure sensor, and an environmental humidity sensor.
In some possible implementations, the flow sensing element of the differential pressure flow sensor may include a throttling device disposed in the airflow conduit and air pressure sampling points disposed on front and rear sides of the throttling device, and electric heating plates disposed on front and rear sides of the throttling device for heating the cavity spaces in front and rear of the throttling device.
In some possible implementations, the processing module is connected to a control circuit of the electric heating plate, and the processing module is further configured to control a heating process of the electric heating plate through the control circuit.
In some possible implementations, the processing module is further specifically configured to control the heating process of the electric heating plate according to the ambient temperature data monitored by the ambient temperature sensor.
In some possible implementations, the processing module is specifically configured to determine, when the differential pressure data is less than the first differential pressure threshold, a flow value of the measured airflow using the differential pressure data; when the pressure difference data is larger than or equal to a first pressure difference threshold value and the time difference data is larger than or equal to a first time difference threshold value, the time difference data is used for determining the flow value of the detected airflow, the first flow threshold value is equal to the second flow threshold value, and the first pressure difference threshold value and the first time difference threshold value are used for representing the first flow threshold value.
In some possible implementations, the airflow conduit may include a first tube segment and a second tube segment, the flow sensing element of the differential pressure flow sensor being disposed on the first tube segment, the flow sensing element of the ultrasonic flow sensor being disposed on the second tube segment, the first tube segment and the second tube segment being in communication with each other using an air path connector.
In some possible implementations, the processing module triggers a fault alert prompt when the differential pressure data is greater than or equal to a first differential pressure threshold, but the time difference data is less than the first time difference threshold.
In some possible implementations, the processing module triggers a fault alert prompt when a difference between the flow value calculated from the differential pressure data and the flow value calculated from the time difference data is greater than a preset threshold.
In some possible implementations, the second flow threshold is greater than the first flow threshold, and the processing module determines the flow value of the measured airflow using the pressure difference data and the time difference data simultaneously when the flow of the measured airflow is determined to be greater than or equal to the first flow threshold and less than the second flow threshold according to the pressure difference data and the time difference data.
In some possible implementations, the respiratory diagnostic device is a lung function meter or an exhaled nitric oxide detection device.
Compared with the prior art, the embodiment of the application has the following main beneficial effects:
the flow detection device in the embodiment is applied to respiratory diagnosis equipment, and a differential pressure flow sensor and a flow sensing element of an ultrasonic flow sensor are simultaneously arranged on an airflow pipeline of the flow detection device. After the detected airflow is input into the airflow pipeline, the processing module of the flow detection device can judge the flow of the detected airflow according to the pressure difference data reported by the pressure difference flow sensor and the time difference data reported by the ultrasonic flow sensor. Since the measurement accuracy of the differential pressure flow sensor is better in the case of small flow rates, and the measurement accuracy of the ultrasonic flow sensor is better in the case of high flow rates. Therefore, when the flow rate of the detected air flow is judged to be smaller than the first flow rate threshold value, namely under the condition of small flow rate, the processing module adopts the differential pressure data to determine the flow rate value of the detected air flow, so that better measurement accuracy can be achieved; when the flow rate of the detected airflow is greater than or equal to the second flow rate threshold, that is, under the condition of large flow rate, the processing module determines the flow rate value of the detected airflow by adopting the time difference value data, and can also have better measurement accuracy, wherein the second flow rate threshold is greater than or equal to the first flow rate threshold. Therefore, in summary, the flow detection device of the embodiment can simultaneously consider the small flow test precision when the large flow test precision is satisfied by adopting the differential pressure flow sensor and the ultrasonic flow sensor.
Drawings
For a clearer description of the solution in the present application, a brief description will be given below of the drawings that are needed in the description of the embodiments of the present application, it being obvious that the drawings in the following description are some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic view of an embodiment of a gas flow rate detection device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of one embodiment of a differential pressure flow sensor 130 according to an embodiment of the present application.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In order to better understand the technical solutions of the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings.
Referring specifically to fig. 1, fig. 1 is a schematic view of an embodiment of a gas flow rate detection device according to an embodiment of the present application, where the gas flow rate detection device is used in a respiratory diagnosis apparatus, and includes:
an airflow conduit 110, a processing module 120, a differential pressure flow sensor 130, and an ultrasonic flow sensor 140;
the air flow pipe 110 is provided with flow sensing elements of the differential pressure flow sensor 130 and the ultrasonic flow sensor 140;
after inputting the measured air flow into the air flow pipeline 110, the differential pressure flow sensor 130 generates differential pressure data and reports the differential pressure data to the processing module 120, and the ultrasonic flow sensor 140 generates time differential value data and reports the time differential value data to the processing module 120;
the processing module 120 is configured to determine a flow value of the detected airflow using the differential pressure data when the flow of the detected airflow is determined to be less than a first flow threshold according to the differential pressure data and the time difference data; when the flow rate of the detected air flow is larger than or equal to a second flow rate threshold value according to the pressure difference data and the time difference data, the time difference data is adopted to determine the flow rate value of the detected air flow, and the second flow rate threshold value is larger than or equal to the first flow rate threshold value.
In this embodiment, the gas flow rate detection device may be a component of a respiratory diagnosis apparatus for measuring a flow rate of a respiratory gas flow of a patient or a subject so as to perform medical diagnosis on a respiratory system of the subject.
The airflow duct 110 is a hollow ventilation duct, one end of which may communicate with the user's breathing port and the other end of which may communicate with the atmosphere. The differential pressure flow sensor 130 and the ultrasonic flow are respectively provided with a flow sensing element on the inner wall of the airflow pipeline 110, when the detected airflow is input into the airflow pipeline 110, for example, when a subject accesses a user breathing port to perform lung ventilation test, the differential pressure flow sensor 130 acquires differential pressure data through the flow sensing elements and reports the differential pressure data to the processing module 120, and the ultrasonic flow sensor 140 acquires time difference data through the flow sensing elements and reports the time difference data to the processing module 120.
The processing module 120 may include one or more processors, including multiple processors, and different processors may be used in conjunction with different components to perform different functional tasks. Also, the one or more processors of the processing module 120 may be integrated within the gas flow sensing device or may be located within other devices having a communication connection with the gas flow sensing device.
The flow sensing element of the differential pressure flow sensor 130 mainly includes a throttle device, and two pressure sensors respectively provided at front and rear ends of the throttle device in the air flow direction as pressure sampling points. The throttling device, which may be a screen structure, is disposed in the middle of the airflow channel 110, and when the airflow passes through the screen, a pressure difference is formed at the front end and the rear end of the screen due to the resistance of the screen, the pressure difference and the airflow flow through the airflow channel 110 form a functional relationship, and the flow value of the airflow can be calculated through the functional relationship after the pressure difference is measured.
Taking the example shown in fig. 1 as an example, the air flow to be measured enters from one end of the air flow pipeline 110, the air path pressure P2 before passing through the screen is obtained at the sampling port at the front end of the screen, the air flow to be measured continues to move through the screen, the air path pressure P1 after passing through the screen is obtained at the sampling port at the rear end of the screen, and thus the pressure difference Δp=p2-P1 before and after the air flow passes through the screen is obtained. Then, the differential pressure flow sensor 130 reports the data of the pressure difference as differential pressure data, and the subsequent processing module 120 can calculate the flow of the detected airflow according to the differential pressure data.
The flow sensing element of the ultrasonic flow sensor 140 basically comprises two ultrasonic transducers, each of which is capable of both transmitting and receiving ultrasonic waves. Referring to fig. 1, the two ultrasonic transducers are symmetrically arranged on the upper and lower walls of the left and right ends of the air flow pipe 110, respectively, and are mounted at the same included angle θ with the air chamber wall to form a straight line correlation with a distance L. The time difference from emission to reception along the direction of the air flow is Tu, the time difference against the direction of the air flow is Td, the speed C of the ultrasound and the flow velocity V have the following functional relationship:
the flow rate value of the gas flow can be converted by taking the time difference Δt=tu-Td. Therefore, after the ultrasonic flow sensor 140 acquires Δt, the data is reported as time difference data, and the subsequent processing module 120 may calculate the flow rate of the detected air flow according to the time difference data.
Based on detection principle and research, the differential pressure flow sensor is more suitable for sampling small and slow-change flow signals, while the ultrasonic flow sensor 140 is more suitable for sampling larger and fast-change flow signals, namely, the differential pressure flow sensor has better measurement precision when the differential pressure flow sensor is in small flow, and the ultrasonic flow sensor 140 has better measurement precision when the differential pressure flow sensor is in large flow. Therefore, in this embodiment, after the processing module 120 obtains the differential pressure data and the time difference data, when the flow rate is determined to be smaller than the first flow rate threshold value according to the differential pressure data and the time difference data, the situation can be considered as a small flow rate, and at this moment, the processing module 120 uses the differential pressure data as a calculation basis to calculate and determine the flow rate value of the detected airflow, so that the measurement of the small flow rate can be more accurate; when the flow rate is greater than or equal to the second flow rate threshold value according to the pressure difference data and/or the time difference data, the processing module 120 calculates and determines the flow rate value of the detected air flow by taking the time difference data as a calculation basis, so that the measurement of the large flow rate can be more accurate.
In addition, the sampling rate of the digital pressure sensor commonly used in the market is generally greater than 3ms, and the resolution is low, so in order to improve the measurement accuracy, the pressure sensor in the differential pressure flow sensor 130 in this embodiment may be an analog pressure sensor, and an analog-to-digital conversion circuit with high sampling rate and high resolution is disposed between the differential pressure flow sensor 130 and the processing module 120. Thus, after the differential pressure flow sensor collects the analog signal of the differential pressure delta P, the analog signal is subjected to signal conditioning, the analog-to-digital conversion circuit is adopted to perform analog-to-digital conversion, and then the data is sent to the processing module 120, and the algorithm is used for data judgment.
Further, similar to the differential pressure flow sensor 130 described above, the ultrasonic transducer in the ultrasonic flow sensor 140 may also be an analog ultrasonic transducer to improve the flow measurement accuracy. An analog-to-digital conversion circuit is also disposed between the ultrasonic flow sensor 140 and the processing module 120 to facilitate analog-to-digital conversion of the Δt analog signals and report the converted data to the processing module 120.
Further, referring to fig. 1, the processing module 120 may include a microcontroller (Microcontroller Unit, MCU) and a main processor, wherein the microcontroller is connected to the differential pressure flow sensor 130 and the ultrasonic flow sensor 140, and is mainly used for controlling and collecting sensor data, thereby reducing the burden of the main processor.
Compared with the prior art, the embodiment of the application has the following main beneficial effects:
the flow detection device in this embodiment is applied to a respiratory diagnosis apparatus, and the flow sensing element of the differential pressure flow sensor 130 and the ultrasonic flow sensor 140 is simultaneously disposed on the airflow pipe 110 of the flow detection device. After the detected airflow is input into the airflow pipe 110, the processing module 120 of the flow detection device can determine the flow of the detected airflow according to the differential pressure data reported by the differential pressure flow sensor 130 and the time difference data reported by the ultrasonic flow sensor 140. Since the measurement accuracy of the differential pressure flow sensor is better in the case of small flow rates, and the measurement accuracy of the ultrasonic flow sensor 140 is better in the case of high flow rates. Therefore, when the flow rate of the detected airflow is determined to be smaller than the first flow rate threshold, i.e. in the case of a small flow rate, the processing module 120 determines the flow rate value of the detected airflow by using the differential pressure data, so that better measurement accuracy can be achieved; when the flow rate of the detected airflow is greater than or equal to the second flow rate threshold, that is, the large flow rate, the processing module 120 uses the time difference data to determine the flow rate value of the detected airflow, which may also have better measurement accuracy. Thus, in summary, the flow rate detection device of the present embodiment can simultaneously consider the small flow rate test accuracy while satisfying the large flow rate test accuracy by adopting the differential pressure flow sensor 130 and the ultrasonic flow sensor 140.
In some possible implementations, the processing module 120 is specifically configured to determine, when the differential pressure data is less than a first differential pressure threshold, a flow value of the measured airflow using the differential pressure data; when the pressure difference data is larger than or equal to a first pressure difference threshold value and the time difference data is larger than or equal to a first time difference threshold value, the time difference data is used for determining the flow value of the detected airflow, the first flow threshold value is equal to the second flow threshold value, and the first pressure difference threshold value and the first time difference threshold value are used for representing the first flow threshold value.
In this embodiment, referring to the descriptions of the differential pressure flow sensor 130 and the ultrasonic flow sensor 140, it is known that the differential pressure data and the flow value, and the time difference data and the flow value are all formed as a functional relationship, so the first flow threshold and the second flow threshold may be converted into the first differential pressure threshold and the second differential pressure threshold of the differential pressure flow sensor 130, and into the first time difference threshold and the second time difference threshold of the ultrasonic flow sensor 140, respectively. When judging whether the detected airflow is small flow or large flow, the pressure difference data and the time difference data can be directly adopted to compare and judge with the corresponding threshold values. Therefore, when the first flow threshold value and the second flow threshold value are the same, the first differential pressure threshold value and the first time difference threshold value are both used for representing the first flow threshold value, and the differential pressure data acquired by the processing module 120 can be set to be a small flow scene when the differential pressure data acquired by the processing module 120 is smaller than the first differential pressure threshold value, and finally the flow value of the detected airflow is based on the data detected by the differential pressure flow sensor 130; the differential pressure data detected by the processing module 120 is greater than or equal to the first differential pressure threshold value and the time difference data is also greater than or equal to the first time difference threshold value, which can be considered as a large flow scene, and the flow value of the final detected airflow is based on the data detected by the ultrasonic flow sensor 140.
In some possible implementations, referring to fig. 1, the gas flow detection device may further include an environmental sensor 150, and the processing module 120 is further configured to perform compensation calibration on the flow value of the detected gas flow according to the environmental parameter detected by the environmental sensor 150, where the environmental sensor 150 may include an environmental temperature sensor, an environmental pressure sensor, and an environmental humidity sensor.
In this embodiment, the gas flow rate is detected, and the environment affects the gas density, so that the volume flow rate of the gas is affected. Moreover, the environment used for calibrating the gas flow is different from the actual environment, so that the theoretical value of the calibrated flow can deviate from the actual value of the actual test if compensation correction is not performed. Thus, to improve measurement accuracy, the gas flow detection device further comprises an environmental sensor 150, which environmental sensor 150 may comprise one or more of an environmental temperature sensor, an environmental pressure sensor and an environmental humidity sensor. The processing module 120 may collect environmental parameters in real time through the environmental sensor 150, and perform compensation calibration on the flow value of the measured airflow determined by measurement based on the calibrated environment.
Specifically, the processing module 120 may collect temperature, humidity, and the like in real time via the environmental sensor 150,Altitude pressure and other signals, and bringing the environmental parameters into a preset environmental parameter compensation algorithm formula to obtain a compensation coefficient R Tonifying device And finally, carrying out compensation calibration operation on the flow value of the detected airflow by using the compensation coefficient, thereby obtaining a more accurate flow value.
In some possible implementations, referring to fig. 1, the flow sensing element of the differential pressure flow sensor 130 may include a throttling device disposed in the airflow duct 110 and air pressure sampling points disposed on front and rear sides of the throttling device, and electric heating plates disposed on front and rear sides of the throttling device for heating the cavity space in front and rear of the throttling device.
In this embodiment, the electrical heater chip may be integrated into the differential pressure flow sensor 130. Referring specifically to FIG. 2, one embodiment of a differential pressure flow sensor 130 is illustrated. The differential pressure flow sensor 130 mainly includes a housing structure, an electric heating plate and a thimble. The cover 01 and the shell 02 are assembled into a shell assembly 04, and a closed heating cavity is formed inside the cover, and a heating sheet 06 is placed in the closed cavity and connected to a control circuit through a probe 05 for heating control. The shell components 04 are of symmetrical structures, the screen cloth 03 is of a throttling structure, the two shell components 04 are symmetrically arranged on two sides of the screen cloth 03 respectively, and the screen cloth 03 is pressed and fixed, so that when detected air flow passes through the differential pressure and differential flow sensor, the detected air flow can be heated at the front and rear sides of the screen cloth simultaneously.
Because the gas which is exhaled by the human body and saturated with water vapor is easy to condense at the positions of the screen mesh of the differential pressure flow sensor and the air passage of the ultrasonic flow sensor 140, water drops are formed, and the measurement accuracy is affected. Therefore, a heating plate can be arranged in the airflow pipeline 110 to heat the tested airflow in the airflow pipeline 110. Specifically, the heating sheet is an electric heating sheet, and referring to fig. 1, the electric heating sheet may be disposed on each of the front and rear sides of the throttle device of the differential pressure flow sensor 130. When the flow measurement is performed, the electric heating plate is used for heating the air flow in the air flow pipeline 110 to the preset oral temperature, such as about 35 degrees, so that on one hand, the comfort of a user during the test can be improved, on the other hand, the temperature environment in the air path can be kept stable, and the flow precision after the environmental parameter compensation calculated by the processing module 120 is improved.
In some possible implementations, the processing module 120 is connected to a control circuit of the electric heating plate, and the processing module 120 is further configured to control a heating process of the electric heating plate through the control circuit.
In this embodiment, the processing module 120 is connected to a control circuit of the electric heating sheet, so that the processing module 120 can also control the heating process of the electric heating sheet through the control circuit.
In some possible implementations, the processing module 120 is further specifically configured to control the heating process of the electric heating plate according to the ambient temperature data monitored by the ambient temperature sensor, such as setting the heating power of the control circuit according to the ambient temperature and the preset oral temperature.
In this embodiment, the processing module 120 may output different heating powers through the control circuit according to the ambient temperature data of the ambient temperature sensor, so as to improve the heating efficiency.
In some possible implementations, referring to fig. 1, the airflow conduit 110 may include a first tube segment and a second tube segment, the flow sensing element of the differential pressure flow sensor 130 being disposed on the first tube segment, the flow sensing element of the ultrasonic flow sensor 140 being disposed on the second tube segment, the first tube segment and the second tube segment being in communication with each other using an air circuit connector.
In some possible implementations, the processing module 120 triggers a fault alert when the flow of the measured gas stream and the magnitude of the first flow threshold are different in conclusion based on the pressure differential data and the time difference data, respectively.
In this embodiment, the flow rate of the measured gas can be calculated according to the differential pressure data or the time difference data, but due to the measurement error and the difference of accuracy under different flow rates, the conclusion that the flow rate of the measured gas and the first flow threshold value may be different according to the differential pressure data and the time difference data, respectively, and the processing module 120 triggers an alarm prompt. For example, the processing module 120 may generate an alarm to remove the equipment failure, etc. when the detected airflow is determined to be a large flow according to the pressure difference data and the detected airflow is further determined to be a small flow according to the time difference data.
In some possible implementations, the second flow threshold is greater than the first flow threshold, and the processing module 120 determines the flow value of the measured airflow using both the pressure difference data and the time difference data when the flow of the measured airflow is determined to be greater than or equal to the first flow threshold and less than the second flow threshold based on the pressure difference data and the time difference data.
In this embodiment, when the flow rate of the detected air flow is in the intermediate state of "large flow rate" and "small flow rate", that is, the second flow rate threshold is greater than the first flow rate threshold, and when the flow rate of the detected air flow is determined to be greater than or equal to the first flow rate threshold according to the differential pressure data and the time difference data and is less than the second flow rate threshold, the flow rate measurement accuracy of the differential pressure flow sensor 130 and the ultrasonic flow sensor 140 is close, and at this time, the processing module 120 may simultaneously calculate the flow rate value of the detected air flow by using the differential pressure data and the time difference data together. For example, the flow value of the detected airflow may be calculated and averaged.
In some possible implementations, the respiratory diagnostic device is a lung function meter or an exhaled nitric oxide detection device.
In this embodiment, the gas flow detection device is used in a respiratory diagnosis apparatus, which may be a lung function meter, a spirometer, an exhaled nitric oxide detector, or the like.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It is apparent that the embodiments described above are only some embodiments of the present application, but not all embodiments, the preferred embodiments of the present application are given in the drawings, but not limiting the patent scope of the present application. This application may be embodied in many different forms, but rather, embodiments are provided in order to provide a more thorough understanding of the present disclosure. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing, or equivalents may be substituted for elements thereof. All equivalent structures made by the specification and the drawings of the application are directly or indirectly applied to other related technical fields, and are also within the protection scope of the application.
Claims (10)
1. A gas flow detection device for use in a respiratory diagnostic apparatus, comprising:
the device comprises an airflow pipeline, a processing module, a differential pressure flow sensor and an ultrasonic flow sensor;
the flow sensing element of the differential pressure flow sensor and the ultrasonic flow sensor is arranged on the airflow pipeline;
after the detected air flow is input into the air flow pipeline, the differential pressure flow sensor generates differential pressure data and reports the differential pressure data to the processing module, and the ultrasonic flow sensor generates time difference data and reports the time difference data to the processing module;
the processing module is used for determining the flow value of the detected air flow by adopting the pressure difference data when judging that the flow of the detected air flow is smaller than a first flow threshold value according to the pressure difference data and the time difference data; and when judging that the flow rate of the detected air flow is greater than or equal to a second flow rate threshold value according to the pressure difference data and the time difference data, determining the flow rate value of the detected air flow by adopting the time difference data, wherein the second flow rate threshold value is greater than or equal to the first flow rate threshold value.
2. The gas flow detection device of claim 1, further comprising an environmental sensor, wherein the processing module is further configured to compensate for the flow value of the measured gas stream based on an environmental parameter detected by the environmental sensor, wherein the environmental sensor comprises an environmental temperature sensor, an environmental pressure sensor, and an environmental humidity sensor.
3. The gas flow detection device according to claim 2, wherein the flow sensing element of the differential pressure flow sensor comprises a throttling device arranged in the gas flow pipeline and gas pressure sampling points arranged on the front side and the rear side of the throttling device, and electric heating plates are further arranged on the front side and the rear side of the throttling device and used for heating the cavity spaces in front of and behind the throttling device.
4. A gas flow rate detection apparatus according to claim 3, wherein the processing module is connected to a control circuit of the electric heating plate, the processing module being further configured to control a heating process of the electric heating plate by the control circuit.
5. The gas flow sensing device of claim 4, wherein the processing module is further specifically configured to control a heating process of the electrical heater chip via the control circuit based on ambient temperature data monitored by the ambient temperature sensor.
6. A gas flow rate detection apparatus according to any one of claims 1 to 5, wherein,
the processing module is specifically configured to determine a flow value of the detected airflow using the differential pressure data when the differential pressure data is less than a first differential pressure threshold; when the pressure difference data is larger than or equal to a first pressure difference threshold value and the time difference data is larger than or equal to a first time difference threshold value, the time difference data is adopted to determine the flow value of the detected airflow, the first flow threshold value is equal to the second flow threshold value, and the first pressure difference threshold value and the first time difference threshold value are used for representing the first flow threshold value.
7. A gas flow sensing device according to any one of claims 1-5, wherein the gas flow conduit comprises a first tube section and a second tube section, the flow sensing element of the differential pressure flow sensor is disposed on the first tube section, the flow sensing element of the ultrasonic flow sensor is disposed on the second tube section, and a gas path connector is used for communication between the first tube section and the second tube section.
8. The gas flow sensing device of claim 6, wherein the processing module triggers a fault alert when the differential pressure data is greater than or equal to the first differential pressure threshold, but the time differential data is less than the first time differential threshold.
9. The gas flow rate detection apparatus according to any one of claims 1 to 6, wherein the second flow rate threshold value is larger than the first flow rate threshold value, and the processing module determines the flow rate value of the gas flow to be detected using both the pressure difference data and the time difference data when it is determined that the flow rate of the gas flow to be detected is larger than or equal to the first flow rate threshold value and smaller than the second flow rate threshold value based on the pressure difference data and the time difference data.
10. A gas flow detection apparatus according to any of claims 1-6, wherein the respiratory diagnostic device is a lung function meter or an exhaled nitric oxide detection device.
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|---|---|---|---|
| CN202311863391.5A CN117679011A (en) | 2023-12-29 | 2023-12-29 | Gas flow detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311863391.5A CN117679011A (en) | 2023-12-29 | 2023-12-29 | Gas flow detection device |
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| CN117679011A true CN117679011A (en) | 2024-03-12 |
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