CN111351532A - Bidirectional double-pressure-difference type respiratory flow detection sensing device and method - Google Patents
Bidirectional double-pressure-difference type respiratory flow detection sensing device and method Download PDFInfo
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- CN111351532A CN111351532A CN202010353813.4A CN202010353813A CN111351532A CN 111351532 A CN111351532 A CN 111351532A CN 202010353813 A CN202010353813 A CN 202010353813A CN 111351532 A CN111351532 A CN 111351532A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/10—Preventing damage by freezing or excess pressure or insufficient pressure
Abstract
The invention discloses a bidirectional double-pressure-difference type respiratory flow detection sensing device which comprises a throttling piece, two pressure difference sensors, a processing module and a power supply module for supplying power, wherein the two pressure difference sensors are respectively connected to the throttling piece and synchronously acquire pressure difference signals, the processing module comprises a microprocessor, a control module, a storage module and a display module, the control module, the storage module and the display module are respectively and electrically connected to the microprocessor, a system software program is solidified on the microprocessor, the microprocessor receives the two pressure difference signals to process the two pressure difference signals to obtain measurement data, the measurement data are displayed by the display module and stored by the storage module, and the control module controls the operation state of the processing module. The sensing device has the advantages of simple structure, stability, reliability and low cost, can simultaneously meet the requirements of wide measuring range of the respiratory flow and high precision when the flow is low-speed, and is suitable for the bidirectional measurement of the respiratory flow under the states of rest and motion. The invention also provides a bidirectional double-pressure-difference type respiratory flow detection and measurement method.
Description
Technical Field
The invention relates to the technical field of medical detection instruments, in particular to a bidirectional double-pressure-difference type respiration flow detection sensing device and method.
Background
The respiratory flow of a human body is one of key indexes for clinical diagnosis and evaluation of lung diseases, particularly, the respiratory flow measurement in a motion state can reflect the motion capability and the cardio-pulmonary function condition of a patient, and is commonly used for rehabilitation, preoperative evaluation and the like of the patient. The respiratory rate of a human body is accelerated in a motion state, the respiratory depth and strength are increased, and the respiratory rate in the motion state is accompanied by a body movement interference signal.
The flow sensors currently used for respiratory flow monitoring are mainly of the turbine type and of the differential pressure type. The turbine type measurement can generate a hysteresis phenomenon at the beginning and the end of the measurement gas due to the inertia effect of an impeller, and the turbine type measurement cannot respond to the flow rate change in time when breathing is alternated. The differential pressure detection has the advantages of high accuracy, high sensitivity, small drift and no relation with the thermal conductivity of the gas. The traditional differential pressure flowmeter is a single-orifice flowmeter, and has the main defects of narrow measuring range and large pressure loss. The prior art improvements of differential pressure flow meters over single orifice flow meters are based on Fleish type differential pressure flow meters and Lilly type differential pressure flow meters and multi-orifice balance flow meters. The Fleish and Lilly flow meters generate linear pressure drop through the capillary network barrier, but the capillary network structure is easy to block and difficult to clean. The improvement of the porous balance flowmeter enables the measuring range ratio of flow measurement to be wide (larger than 10:1), the requirement for a straight pipe section to be low, the pressure loss to be low (only 1/3 of the traditional differential pressure flowmeter), but the porous balance flowmeter is easily affected by vortex after passing through holes, so that the static pressure value jumps, and the signal is unstable. In the prior art, the technical means for bidirectional measurement of respiratory flow in the resting and moving states is still insufficient.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a bidirectional double-pressure-difference type respiratory flow detection sensing device which is simple in structure, stable, reliable and low in cost, meets the requirements of wide respiratory flow measurement range and high flow low-speed precision, and is suitable for bidirectional respiratory flow measurement in rest and motion states.
In order to achieve the purpose, the invention discloses a bidirectional double-pressure-difference type respiratory flow detection sensing device which comprises a throttling piece, two pressure difference sensors, a processing module and a power supply module, wherein the two pressure difference sensors are respectively connected to the throttling piece and synchronously acquire pressure difference signals, the processing module comprises a microprocessor, a control module, a storage module and a display module, the control module, the storage module and the display module are respectively and electrically connected to the microprocessor, a system software program is solidified on the microprocessor, the microprocessor receives the two pressure difference signals to process the two pressure difference signals to obtain measurement data, the measurement data are displayed by the display module and stored by the storage module, the control module sends instructions to the microprocessor to control the running state of the processing module, and the power supply module supplies power to the pressure difference sensors and the processing module.
Further, the throttling element includes the main part pipe, and the main part pipe is hollow body, and the one end of main part pipe is equipped with and is used for installing the connecting tenon on respirator with the throttling element, is equipped with on the connecting tenon along its circumference around the annular groove of a week, is equipped with the balanced orifice plate of coaxial line's thickening in the cavity of main part pipe, is equipped with a plurality of taps of getting with main part pipe inner chamber intercommunication on the lateral wall of main part pipe, and differential pressure sensor connects a pair of tap of getting that is located the balanced orifice plate both ends of thickening respectively and presses in order to acquire pressure differential.
Further, thickening balance hole board has the centre bore that link up along its axis, is equipped with a plurality of through-holes that link up along its axial on the thickening balance hole board, and the through-hole is central radiation symmetry on thickening balance hole face's cross-section, and the through-hole radially divide into a plurality of layers at thickening balance hole board, and every layer of through-hole is along thickening balance hole board's circumference equidistance evenly distributed, and the cross sectional shape of every layer of through-hole is the same respectively.
Further, the through-hole is divided into 3 layers in the footpath of thickening balance hole board altogether, and 3 layers of through-holes are central function hole, middle function hole and nearly wall function hole respectively along thickening balance plate footpath from inside to outside, and the quantity in central function hole, middle function hole and nearly wall function hole is 12 respectively, 12 and 24, central function hole with the centre bore intercommunication, the diameter of centre bore is 1/4 of main part pipe diameter.
Furthermore, the two ends of the thickened balance pore plate are spherical sections, one end of the thickened balance pore plate close to the connecting tenon is a concave hemispherical surface, and the other end of the thickened balance pore plate is a convex hemispherical surface.
Furthermore, the pressure tapping heads connected with the two pressure difference sensors are respectively positioned at two opposite ends of the main body pipe in the circumferential direction, the connecting line of the two pressure tapping heads connected with the same pressure difference sensor is parallel to the axis of the main body pipe, two sampling interface taps are further arranged at one end, close to the connecting tenon, of the main body pipe, and the two sampling interface taps are respectively collinear with the pressure difference sensors on two sides of the main body pipe.
Furthermore, the inner diameter of the main pipe is D, the thickness of the thickening balance pore plate is D, and two pressure taps connected with the same differential pressure sensor are respectively arranged in D/2-D ranges on two sides of the axial center position of the thickening balance pore plate.
Further, the differential pressure sensor includes a small-range high-precision digital differential pressure sensor and a large-range digital differential pressure sensor.
The invention also provides a bidirectional double-pressure-difference type respiratory flow detection method, which comprises the following steps:
s1: the method comprises the following steps of (1) acquiring sensor data, namely, putting a throttling element in an experimental environment without air flow interference, powering on and starting up a system, initializing the system, reading initial values of two differential pressure sensors by a microprocessor at the moment, and converting the read values into differential pressure signal values according to a differential pressure calculation formula;
s2: performing zero-returning processing on the differential pressure signal value acquired in the step S1 to eliminate zero drift;
s3: judging a respiratory flow direction and a double pressure difference sensor, setting an expiratory flow direction judging threshold TH1 and an inspiratory flow direction judging threshold TH2 according to respiratory characteristics, judging the respiratory state when a pressure difference signal value is larger than TH1, judging the inspiratory state when the pressure difference signal value is smaller than TH2, judging no respiratory behavior when the pressure difference signal value is between TH1 and TH2, setting a double pressure difference sensor judging threshold TH3 according to the range precision range of the two pressure difference sensors, judging a signal acquired by the small-range high-precision digital pressure difference sensor to be an effective signal when the absolute value of the pressure difference signal value is smaller than TH3, and judging a signal acquired by the large-range digital pressure difference sensor to be an effective signal when the absolute value of the pressure difference value is larger than TH 3;
s4: converting the differential pressure signal into a flow velocity signal, obtaining a fitting curve according to an automatic calibration curve algorithm built in a microprocessor, and converting the differential pressure signal output by the differential pressure sensor into the flow velocity signal through the fitting curve;
s5: removing noise by using a moving average algorithm, and filtering by using a 10-point moving average to obtain a smooth flow velocity signal v (t);
s6: calculating the real-time respiratory flow, wherein the cross-sectional area of the throttling element is S, and the respiratory flow Vie is Sv (t).
Further, the setting value of TH3 is less than the maximum range of the small-range high-precision digital differential pressure sensor.
The bidirectional double-pressure-difference type respiratory flow detection sensing device has the following beneficial effects:
1. the device has simple structure, stability, reliability and low cost, simultaneously meets the requirements of wide respiratory flow measurement range and high precision when the flow is low speed, and is suitable for the bidirectional measurement of the respiratory flow in the resting and moving states;
2. the optimized design of the thickened balance hole plate can effectively improve the pressure jump phenomenon caused by the eddy current after the gas passes through the hole, enhance the stability of the static pressure signal at the pressure taking point and be beneficial to improving the signal-to-noise ratio of the measurement signal;
3. the length requirement on the straight pipe section of the main body pipe is low, and compared with the length required by the straight pipe section of the standard orifice plate throttling element after the length of D is 3D, the straight pipe section of the main body pipe can be accurately measured only by the length of D after the length of D.
Drawings
The present invention will be further described and illustrated with reference to the following drawings.
FIG. 1 is a block diagram of a bi-directional dual pressure differential respiratory flow sensing device in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a structure for embodying the outer end of the orifice member;
FIG. 3 is a schematic view of a structure for embodying the inner end of the orifice;
FIG. 4 is a schematic view of a structure for embodying the side of the orifice;
FIG. 5 is an end view of the distal end of the orifice member;
FIG. 6 is a cross-sectional view taken at A-A of FIG. 5;
FIG. 7 is an end view of the inner end of the orifice member;
FIG. 8 is a flow chart of a method of bi-directional dual pressure differential respiratory flow detection in accordance with a preferred embodiment of the present invention;
fig. 9 is a cloud of hydrostatic pressure profiles obtained by three-dimensional simulation of the 1/12 sector of the orifice.
Reference numerals: 1. a throttle member; 11. a main body tube; 12. connecting the clamping tenon; 121. an annular groove; 13. thickening the balance hole plate; 131. a central bore; 132. a central function aperture; 133. a middle function aperture; 134. a near wall function aperture; 14. a pressure tap; 15. a sampling interface tap; 2. a differential pressure sensor; 3. a microprocessor; 4. a control module; 5. a storage module; 6. a display module; 7. and a power supply module.
Detailed Description
The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a bidirectional dual pressure difference type respiratory flow detection sensing device according to a preferred embodiment of the present invention includes a throttling element 1, two pressure difference sensors 2, a processing module, and a power supply module 7, wherein the power supply module 7 supplies power to the pressure difference sensors 2 and the processing module. The two differential pressure sensors 2 are respectively connected to the throttling element 1 and synchronously acquire differential pressure signals, the two differential pressure sensors 2 in the embodiment respectively adopt a small-range high-precision digital differential pressure sensor and a large-range digital differential pressure sensor, the small-range high-precision digital differential pressure sensor is used for low-speed low-frequency respiration measurement, and the large-range digital differential pressure sensor is used for high-speed high-frequency respiration measurement.
As shown in fig. 1, the processing module includes a microprocessor 3, a control module 4, a storage module 5 and a display module 6, the control module 4, the storage module 5 and the display module 6 are respectively electrically connected to the microprocessor 3, a system software program is solidified on the microprocessor 3, the microprocessor 3 receives two paths of pressure difference signals to process the pressure difference signals to obtain measurement data, and the control module 4 sends an instruction to the microprocessor 3 to control the operating state of the processing module. The user operation control module 4 sends a measurement command to the microprocessor 3, a system software program realizes differential pressure data acquisition and calculation, a calculation result is displayed through the display module 6 and stored by the storage module 5, and the stored data is used for subsequent diagnosis and evaluation. The user-operable control module 4 sends an end command to the microprocessor 3 terminating the measurement.
As shown in fig. 3 and 4, the throttle 1 includes a main tube 11, and the main tube 11 is a hollow tube body for carrying fluid. One end of the main tube 11 is provided with a connecting tenon 12 for mounting the throttle 1 on the breathing mask, and the diameter of the inner through hole of the main tube 11 is consistent with that of the main tube. The connecting tenon 12 is formed by annular hole plates with different diameters, so that an annular groove 121 which surrounds the periphery of the connecting tenon 12 is formed, and the annular groove 121 is matched with an annular gasket for use. When the throttling element 1 is installed on the breathing mask, the connecting tenon 12 is inserted into the mask fixing interface from the outside of the breathing mask, and the elastic annular plastic gasket is installed in the annular groove 121, so that the throttling element 1 is successfully installed on the breathing mask to form a main-path type airflow passage for flow measurement.
As shown in fig. 2 and 6, a thickened balance pore plate 13 coaxial with the main body tube 11 is arranged in the cavity of the main body tube 11, two ends of the thickened balance pore plate 13 are spherical sections, the proximal end of the thickened balance pore plate 13 close to the connecting tenon 12 is a concave hemispherical surface, and the distal end is a convex hemispherical surface. The gas to be measured forms a pressure drop by thickening the balance orifice plate 13. The side wall of the main body pipe 11 is provided with four pressure taps 14 communicated with the inner cavity of the main body pipe 11, the pressure taps 14 and the main body pipe 11 are integrally formed, and the pressure difference sensor 2 is connected with the pressure taps 14 and can measure the static pressure of the point or perform gas sampling.
As shown in fig. 2 and 6, the pressure taps 14 connected to the two differential pressure sensors 2 are respectively located at two circumferentially opposite ends of the main pipe 11, and a line connecting the two pressure taps 14 connected to the same differential pressure sensor 2 is parallel to the axis of the main pipe 11. The end of the main pipe 11 close to the connecting tenon 12 is also provided with two sampling interface taps 15, the two sampling interface taps 15 are respectively collinear with the differential pressure sensors 2 on the two sides of the main pipe 11, and the sampling interface taps 15 are used as sampling interfaces reserved for monitoring gas components.
As shown in fig. 2 and 6, the inner diameter of the main tube 11 is D, and the thickness of the balance orifice 13 is D, i.e., both are the same, and the inner diameter of the main tube 11 in this embodiment is between 15mm and 30 mm. Two pressure taps 14 connected with the same differential pressure sensor 2 are respectively arranged in the range of D/2-D at two sides of the axial center position of the thickening balance pore plate 13. The optimization of the position of the pressure tap 14 enables a stable differential pressure signal to be obtained by the pressure measuring device, and the volume flow to be measured is calculated according to the Bernoulli equation. In addition, the length of the main pipe 11 can be accurately measured within the range of 1D of the length before and after thickening the balance orifice plate 13.
As shown in fig. 2 and 6, the thickened balance orifice plate 13 has a center hole 131 penetrating along its axis, and the diameter of the center hole 131 is 1/4 of the inner diameter of the main body pipe 11. The thickened balance hole plate 13 is provided with a plurality of through holes which are axially communicated, and the through holes are in central radiation symmetry on the section of the thickened balance hole surface. The through holes are divided into 3 layers in the radial direction of the thickening balance pore plate 13, the through holes in each layer are uniformly distributed along the circumferential direction of the thickening balance pore plate 13 at equal intervals, and the cross-sectional shapes of the through holes in each layer are respectively the same. The 3 layers of through holes are respectively a central function hole 132, an intermediate function hole 133 and a near wall function hole 134 from inside to outside along the radial direction of the thickening balance plate, and the number of the central function hole 132, the intermediate function hole 133 and the near wall function hole 134 is 12, 12 and 24 respectively. The central function hole 132 is communicated with the central hole 131, and comprises 4 layers of function holes on the thickened balance hole plate 13 of the central hole 131.
The thickening balance pore plate 13 optimizes the position and the size of the function pore opening on the basis of a standard pore plate, increases the plate thickness, minimizes the eddy after the fluid is balanced and rectified, and forms approximate ideal fluid. The thickened balance orifice plate 13 formed by the through holes is in a spherical section in the direction vertical to the airflow, the near-opening end is a concave spherical surface, the far-opening end is a convex spherical surface, and the spherical surface can change the convergence direction of fluid and the fluid distribution near the wall surface. In order to further verify the effect of the thick plate porous balance throttling element 1, three-dimensional simulation is carried out on the throttling element 1 by using Fluent software. The throttle 1 is an axisymmetric structure, therefore, only the smallest unit, namely 1/12 sector of the throttle 1, needs to be simulated in three dimensions to reduce the simulation calculation amount and accelerate the calculation time to obtain fig. 9, and two sides of the cloud graph respectively represent the distribution clouds of the hydrostatic pressure during expiration and inspiration. Simulation results show that the throttling element 1 of the invention performs effective rectification compared with the orifice throttling element 1 with the same sectional area. As can be seen from the cloud chart of the distribution of the expiratory and inspiratory hydrostatic pressures, when in expiration, the concave surface is an air inlet, and backflow occurs on the near-wall surface of the main body tube 11, so that a negative pressure value is generated; when breathing in, the convex surface is the air inlet, and the backward flow takes place in thickening balance orifice 13 structure middle part, and main internal wall face pressure is the trend of progressively descending, remains big central hole 131 and makes the vortex phenomenon assemble in throttling element 1 center pin department, can't observe nearly the vortex effect of wall department (getting promptly pressure tap 14 department) this moment.
A bidirectional dual pressure difference type respiratory flow detection method according to a preferred embodiment of the present invention, as shown in fig. 8, includes the following steps:
s1: the method comprises the following steps of (1) acquiring sensor data, namely, putting a throttling element 1 in an experimental environment without air flow interference, powering on and starting up a system, initializing a system, reading initial values of two differential pressure sensors 2 by a microprocessor 3 at the moment, and converting the read values into differential pressure signal values according to a differential pressure calculation formula;
s2: performing zero-returning processing on the differential pressure signal value acquired in the step S1 to eliminate zero drift;
s3: judging a respiratory flow direction and the double pressure difference sensor 2, setting an expiratory flow direction judging threshold TH1 and an inspiratory flow direction judging threshold TH2 according to respiratory characteristics, judging the respiratory state when a pressure difference signal value is larger than TH1, judging the inspiratory state when the pressure difference signal value is smaller than TH2, judging no respiratory behavior when the pressure difference signal value is between TH1 and TH2, setting a double pressure difference sensor judging threshold TH3 according to the range precision range of the two pressure difference sensors 2, judging a signal acquired by a small-range high-precision digital pressure difference sensor to be an effective signal when the absolute value of the pressure difference signal value is smaller than TH3, judging the signal acquired by a large-range digital pressure difference sensor to be an effective signal when the absolute value of the pressure difference value is larger than TH3, and normally judging the setting value of TH3 to be smaller than the maximum-range high-precision digital pressure difference sensor
S4: the differential pressure signal is converted into a flow velocity signal, a fitting curve is obtained according to an automatic calibration curve algorithm built in the microprocessor 3, and the differential pressure signal output by the differential pressure sensor 2 is converted into the flow velocity signal through the fitting curve;
s5: removing noise by using a moving average algorithm, and filtering by using a 10-point moving average to obtain a smooth flow velocity signal v (t);
s6: calculating the real-time respiratory flow, wherein the cross-sectional area of the throttling element 1 is S, and the respiratory flow Vie is Sv (t).
In conclusion, the bidirectional double-pressure-difference type respiration flow detection sensing device disclosed by the invention can realize the double-range monitoring of expiration and inspiration by combining the analysis of the fluid mechanics theory and the numerical calculation, and solves different requirements of expiration and inspiration monitoring. The device has the characteristics of simple structure, stability, reliability and low cost, can meet the requirements of wide respiratory flow measurement range and high precision when the flow is low-speed, and is suitable for the respiratory flow bidirectional measurement in the resting and moving states.
The above detailed description merely describes preferred embodiments of the present invention and does not limit the scope of the invention. Without departing from the spirit and scope of the present invention, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. The scope of the invention is defined by the claims.
Claims (10)
1. The utility model provides a two-way two pressure differential formula respiratory flow detection sensing device, its characterized in that, including throttle spare, two pressure differential sensor, processing module and power module, two pressure differential sensor connects respectively on the throttle spare and gathers pressure differential signal in step, processing module includes microprocessor, control module, storage module and display module, and control module, storage module and display module electricity are connected respectively on microprocessor, the last solidification system software program of microprocessor, microprocessor receives two way pressure differential signal and handles and obtain measured data, measured data shows through display module and storage module preserves, control module sends instruction control processing module's running state to microprocessor, power module supplies power to pressure differential sensor and processing module.
2. The two-way dual pressure difference type respiration flow detection sensing device according to claim 1, wherein the throttle member comprises a main tube, the main tube is a hollow tube, one end of the main tube is provided with a connecting tenon for installing the throttle member on the respirator, the connecting tenon is provided with an annular groove surrounding a circle along the circumferential direction of the connecting tenon, a coaxial thickening balance orifice plate is arranged in the cavity of the main tube, a plurality of pressure taps communicated with the inner cavity of the main tube are arranged on the side wall of the main tube, and the pressure difference sensor is respectively connected with a pair of pressure taps at two ends of the thickening balance orifice plate to obtain the pressure difference.
3. The sensing device for detecting the bi-directional dual pressure difference type respiratory flow according to claim 2, wherein the thickened balance pore plate has a central hole penetrating along the axis thereof, the thickened balance pore plate is provided with a plurality of through holes penetrating along the axial direction thereof, the through holes are symmetrical in terms of central radiation on the cross section of the thickened balance pore surface, the through holes are divided into a plurality of layers in the radial direction of the thickened balance pore plate, each layer of the through holes are uniformly distributed along the circumferential direction of the thickened balance pore plate at equal intervals, and the cross sectional shapes of the through holes are respectively the same.
4. The sensing device for detecting the bidirectional double pressure difference type respiratory flow according to claim 3, wherein the through hole is divided into 3 layers in the radial direction of the thickened balance orifice plate, the 3 layers of through holes are respectively a central function hole, an intermediate function hole and a near wall function hole from inside to outside in the radial direction of the thickened balance orifice plate, the number of the central function hole, the number of the intermediate function hole and the number of the near wall function hole are respectively 12, 12 and 24, the central function hole is communicated with the central hole, and the diameter of the central hole is 1/4 of the diameter of the main body pipe.
5. The bidirectional double pressure difference type respiration flow rate detection sensing device according to claim 2, wherein both ends of the thickened balance orifice plate are spherical sections, one end of the thickened balance orifice plate close to the connecting tenon is a concave hemispherical surface, and the other end is a convex hemispherical surface.
6. The bidirectional dual pressure difference type respiration flow detection sensing device according to claim 2, wherein the pressure taps connected to the two pressure difference sensors are respectively located at two circumferentially opposite ends of the main tube, a connecting line of the two pressure taps connected to the same pressure difference sensor is parallel to an axis of the main tube, two sampling interface taps are further provided at one end of the main tube close to the connecting tenon, and the two sampling interface taps are respectively collinear with the pressure difference sensors at two sides of the main tube.
7. The sensor for detecting respiratory flow according to claim 6, wherein the main tube has an inner diameter D, the thickened balance orifice has a thickness D, and two pressure taps connected to the same pressure sensor are respectively disposed in the range of D/2 to D on both sides of the axial center of the thickened balance orifice.
8. The bi-directional dual pressure differential respiratory flow sensing device of claim 1, wherein the differential pressure sensor comprises a small range high precision digital differential pressure sensor and a large range digital differential pressure sensor.
9. A bidirectional double-pressure-difference type respiratory flow detection method is characterized by comprising the following steps:
s1: the method comprises the following steps of (1) acquiring sensor data, namely, putting a throttling element in an experimental environment without air flow interference, powering on and starting up a system, initializing the system, reading initial values of two differential pressure sensors by a microprocessor at the moment, and converting the read values into differential pressure signal values according to a differential pressure calculation formula;
s2: performing zero-returning processing on the differential pressure signal value acquired in the step S1 to eliminate zero drift;
s3: judging a respiratory flow direction and a double pressure difference sensor, setting an expiratory flow direction judging threshold TH1 and an inspiratory flow direction judging threshold TH2 according to respiratory characteristics, judging the respiratory state when a pressure difference signal value is larger than TH1, judging the inspiratory state when the pressure difference signal value is smaller than TH2, judging no respiratory behavior when the pressure difference signal value is between TH1 and TH2, setting a double pressure difference sensor judging threshold TH3 according to the range precision range of the two pressure difference sensors, judging a signal acquired by the small-range high-precision digital pressure difference sensor to be an effective signal when the absolute value of the pressure difference signal value is smaller than TH3, and judging a signal acquired by the large-range digital pressure difference sensor to be an effective signal when the absolute value of the pressure difference value is larger than TH 3;
s4: converting the differential pressure signal into a flow velocity signal, obtaining a fitting curve according to an automatic calibration curve algorithm built in a microprocessor, and converting the differential pressure signal output by the differential pressure sensor into the flow velocity signal through the fitting curve;
s5: removing noise by using a moving average algorithm, and filtering by using a 10-point moving average to obtain a smooth flow velocity signal v (t);
s6: calculating the real-time respiratory flow, wherein the cross-sectional area of the throttling element is S, and obtaining the respiratory flow Vie-Sv (t).
10. The method of claim 9, wherein the TH3 setting is less than the maximum range of a small-range high-precision digital differential pressure sensor.
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| CN111896770A (en) * | 2020-07-16 | 2020-11-06 | 中国船舶重工集团公司第七0七研究所九江分部 | Processing circuit suitable for measuring flow velocity based on differential pressure principle |
| WO2021218133A1 (en) * | 2020-04-29 | 2021-11-04 | 南京润楠医疗电子研究院有限公司 | Bidirectional double-differential-pressure respiratory flow detection and sensing apparatus and method |
| WO2022110715A1 (en) * | 2020-11-30 | 2022-06-02 | 深圳市科曼医疗设备有限公司 | Differential pressure type flow sensor and ventilator |
| CN114768135A (en) * | 2022-03-24 | 2022-07-22 | 湖北华强科技股份有限公司 | Breathing following type air supply control system and method for gas mask |
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| GB2622101A (en) * | 2022-09-05 | 2024-03-06 | Arete Medical Tech Ltd | Pitot tube for measuring high and low respiratory flow rates |
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| CN114768135A (en) * | 2022-03-24 | 2022-07-22 | 湖北华强科技股份有限公司 | Breathing following type air supply control system and method for gas mask |
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| CN111351532B (en) | 2022-03-18 |
| WO2021218133A1 (en) | 2021-11-04 |
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