CN111238581A - Peripheral sampling differential pressure sensor for gas flow collection - Google Patents
Peripheral sampling differential pressure sensor for gas flow collection Download PDFInfo
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- CN111238581A CN111238581A CN202010168779.3A CN202010168779A CN111238581A CN 111238581 A CN111238581 A CN 111238581A CN 202010168779 A CN202010168779 A CN 202010168779A CN 111238581 A CN111238581 A CN 111238581A
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- flow
- connecting valve
- flow tube
- differential pressure
- pressure sensor
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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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/082—Evaluation by breath analysis, e.g. determination of the chemical composition of exhaled breath
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/087—Measuring breath flow
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Abstract
The invention discloses a peripheral sampling differential pressure sensor for collecting gas flow, which comprises a front flow pipe, a rear flow pipe and a connecting valve. The connecting valve is connected with the front flow pipe and the rear flow pipe in the middle, a plurality of air inlets through which air flows can pass are arranged on the inner ring of the connecting valve, two annular flow cavities which are mutually isolated are arranged in the connecting valve, an integrated buckle is arranged on the connecting valve, two pressure taking ports are arranged on the two annular flow cavities, and the two annular flow cavities are respectively communicated with the inlet end and the outlet end through the air inlets arranged on the inner arm ring of the connecting valve. The invention has the advantages that the flow value in the breathing process is measured in a gas pressure difference mode, and the two annular flow cavities are mutually isolated, so that cross infection is avoided; porous pressure sampling is carried out, so that the components are reliable, and the damage to oxygen components is small; pressure is taken from the periphery of the porous pipe, and the pressure is taken uniformly; the air flow in the tube is smooth and has no obstruction, the air flow obstruction is small, and the air flow flowing is not damaged; the sampling and the pressure taking channel are separated, and the influence on the accuracy of the flow rate measurement is small.
Description
Technical Field
The invention relates to the technical field of gas flow measurement, in particular to a peripheral sampling differential pressure sensor for gas flow acquisition.
Background
The flow sensor is used for a cardiopulmonary exercise test system (CPET), the system obtains a numerical value through collecting respiratory gas flow difference for diagnosis of doctors, the differential pressure sensor is a relatively common flow sensor at home and abroad, a fluid isolation flow cavity channel is arranged on the sensor, gas flow generated by inspiration and expiration is isolated, and the gas flow difference is obtained through a pressure taking port.
The traditional flow sensor has poor precision and is inconvenient to clean and disinfect, and the current pressure difference sensor on the market has the following defects: a pressure taking column is arranged in the flow pipe, the airflow obstruction is large, the gas component damage is large, and the gas flow collection is uneven; the measured data has small precision and large error.
Aiming at the technical problems, an effective method is not solved at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a peripheral sampling differential pressure sensor for collecting gas flow, which measures the gas flow value in the breathing process in a gas differential pressure mode, consumables are isolated from a connecting piece, two annular flow cavities are isolated from each other, and cross infection is avoided; porous pressure sampling is carried out, so that the components are reliable, and the damage to oxygen components is small; pressure is taken from the periphery of the porous pipe, and the pressure is taken uniformly; the inside of the tube is smooth without obstacles, has small unobstructed airflow and meets the ATS resistance requirement, and the front flow tube and the rear flow tube are symmetrical without damaging airflow flow; the sampling is separated from the pressure taking channel, the influence on the accuracy of flow rate measurement is small, the flow rate measurement is converged at the joint, and the connector is small in size and light in weight.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows: a peripheral sampling differential pressure sensor for collecting gas flow comprises a front flow tube, a rear flow tube and a connecting valve. The connecting valve is connected with the front flow tube and the rear flow tube in the middle, a plurality of air inlets through which air can pass are arranged on the inner ring of the connecting valve, two annular flow cavities which are isolated from each other are arranged in the connecting valve, an integrated buckle is arranged on the connecting valve, two pressure taking ports are arranged on the two annular flow cavities, one of the annular flow cavities is communicated with the inlet end through the air inlet arranged on the inner arm ring of the connecting valve, and the other annular flow cavity is communicated with the outlet end through the air inlet arranged on the inner arm ring of the connecting valve.
Preferably, the inner walls of the front flow tube, the rear flow tube and the connecting valve are smooth and free of obstacles.
Preferably, the front flow tube is provided with a plurality of circular filter screens at a position close to the inlet end.
Preferably, the front flow tube and the back flow tube are inwardly angled and the connecting valve connects the front flow tube and the back flow tube.
Preferably, a plurality of air inlets are arranged in the connecting ports of the front flow pipe and the rear flow pipe and the connecting valve.
Preferably, the connecting valve is internally provided with an annular flow cavity which is communicated with a plurality of air inlets of the inner rings of the front and rear flow tubes.
Preferably, the periphery of the connecting valve is provided with a pressure taking port communicated with the cavity.
Preferably, the connecting valve is provided with a sampling port at the periphery.
Preferably, the periphery of the connecting valve is provided with an integrated buckle.
Preferably, two layers of isolated annular flow channels are arranged in the connecting valve.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts a peripheral sampling mode, consumables are isolated from the connecting piece, and two annular flow channels are isolated from each other, so that cross infection is avoided; porous pressure sampling is carried out, so that the components are reliable, and the damage to oxygen components is small; pressure is taken from the periphery of the porous pipe, and the pressure is taken uniformly; the inside of the tube is smooth without obstacles, has small unobstructed airflow and meets the ATS resistance requirement, and the front flow tube and the rear flow tube are symmetrical without damaging airflow flow; the sampling is separated from the pressure taking channel, the influence on the accuracy of flow rate measurement is small, the flow rate measurement is converged at the joint, and the connector is small in size and light in weight.
Drawings
FIG. 1 is a schematic diagram of a peripheral sampling differential pressure sensor for gas flow acquisition according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a peripheral sampling differential pressure sensor for gas flow acquisition according to an embodiment of the present invention;
in the figure: 1. a front flow tube; 2. a rear flow tube; 3. a connecting valve; 4. an inlet end; 5. an outlet end; 6. a filter screen; 7. a pressure taking port; 8. a sampling port; 9. an air inlet; 10. an annular flow channel; 11. and (5) buckling.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in figures 1-3, the invention relates to a peripheral sampling differential pressure sensor for gas flow collection, which comprises a front flow pipe (1), a rear flow pipe (2) and a connecting valve (3). The connecting valve (3) is connected with the front flow tube (1) and the rear flow tube (2) in the middle, a plurality of air inlets (9) allowing air flow to pass through are formed in the inner ring of the connecting valve (3), two annular flow cavities (10) which are isolated from each other are arranged in the connecting valve (3), an integrated buckle (11) is arranged on the connecting valve (3), two pressure taking ports (7) are formed in the two annular flow cavities (10), one of the annular flow cavities is communicated with the inlet end (4) through the air inlet (9) formed in the inner arm ring of the connecting valve (3), and the other annular flow cavity (10) is communicated with the outlet end (5) through the air inlet (9) formed in the inner arm ring of the connecting valve (3).
In one embodiment of the invention, the inner walls of the front flow tube (1), the rear flow tube (2) and the connecting valve (3) are smooth and free of obstacles.
In one embodiment of the invention, the front flow tube 1 is provided with a circular filter screen 6 near the inlet end 4.
In a specific embodiment of the present invention, the middle portions of the front flow tube 1 and the back flow tube 2 are inwardly and angularly contracted, and the connecting valve 3 connects the front flow tube 1 and the back flow tube 2.
In an embodiment of the present invention, a plurality of air inlets 9 are provided in the connecting ports of the front flow tube 1, the rear flow tube 2 and the connecting valve 3.
In one embodiment of the invention, the connecting valve is internally provided with an annular flow cavity (10) which is communicated with a plurality of air inlets (9) of the inner rings of the front flow tube (1) and the rear flow tube (2).
In one embodiment of the invention, the connecting valve 3 is provided with a sampling port 8 at its periphery.
In a specific embodiment of the present invention, the connecting valve 3 is provided with an integral snap 11 at the periphery.
In one embodiment of the invention, two layers of isolated annular flow channels 10 are provided in the connecting valve 3.
In order to facilitate understanding of the technical solutions of the present invention, the technical solutions are described in detail below by using specific methods.
The differential pressure sensor adopts a differential pressure mode to measure the flow by measuring the bidirectional gas flow differential pressure in the breathing process from the differential pressure in the two annular flow cavities 10 in the connecting valve, and compared with the traditional differential pressure flow sensor, the differential pressure sensor adopts a peripheral sampling mode, consumables are isolated from a connecting piece, the two annular flow cavities are isolated from each other, and cross infection is avoided; porous pressure sampling is carried out, so that the components are reliable, and the damage to oxygen components is small; pressure is taken from the periphery of the porous pipe, and the pressure is taken uniformly; the inside of the tube is smooth without obstacles, has small unobstructed airflow and meets the ATS resistance requirement, and the front flow tube and the rear flow tube are symmetrical without damaging airflow flow; the sampling is separated from the pressure taking channel, the influence on the accuracy of flow rate measurement is small, the flow rate measurement is converged at the joint, and the connector is small in size and light in weight.
The peripheral sampling differential pressure sensor comprises a structure that a front flow pipe 1 and a rear flow pipe 2 contract inwards and a connecting valve 3, when breathing, gas flow uniformly enters an annular flow cavity channel 10 through an annular gas inlet 9 on the connecting valve 3 without any barrier shielding, the destructiveness of gas components is small, the gas flow measurement precision is high, and the bidirectional gas flow of breathing gas of a subject can be calculated by measuring the pressure difference measured by a pressure taking port communicated with the two isolated annular flow cavity channels.
The round filter screen 6 is arranged at the inlet end 4, so that foreign matters and saliva in the breathing process can be effectively intercepted, and the flow can normally pass without interference.
During specific operation, the upper fluid pipe 1 and the rear fluid pipe 2 are connected through the connecting valve, the inlet end 4 of the front fluid pipe 1 is detachably connected with a mask or a mouthpiece, the flow pipe is connected with an external detachable plug, a subject takes the mask or the mouthpiece to breathe, gas enters the annular cavity from the inlet end 4 and flows to the outlet end 5 during exhalation, the gas enters the annular cavity from the outlet end 5 and flows into the inlet end 4 during inhalation, the gas enters the annular flow cavity 10 through the gas inlet 9 during flowing through the connecting valve, gas differential pressure is obtained from the pressure taking port 7, and real-time flow rate and flow of breath of the subject, oxygen and carbon dioxide components of the breath gas are collected and analyzed through the sampling port 8.
In conclusion, the technical scheme of the invention has the advantages of simple and smooth structure, convenient and quick use, accurate test by adopting a peripheral sampling mode and accordance with ATS requirements; the consumptive material is kept apart with the connecting piece, but connecting piece and consumptive material repetitious usage, and use cost formula is cheap than the integral type, can be used to cardiopulmonary testing system to carry out flow gas acquisition computational analysis.
The preferred embodiments of the present invention are described in the above embodiments and the description, which are not intended to limit the present invention, and various changes and modifications may be made without departing from the spirit and scope of the present invention, and these changes and modifications are intended to fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A peripheral sampling differential pressure sensor for collecting gas flow comprises a front flow tube (1), a rear flow tube (2) and a connecting valve (3). The connecting valve (3) is connected with the front flow tube (1) and the rear flow tube (2) in the middle, a plurality of air inlets (9) allowing air flow to pass through are formed in the inner ring of the connecting valve (3), two annular flow cavities (10) which are isolated from each other are arranged in the connecting valve (3), an integrated buckle (11) is arranged on the connecting valve (3), two pressure taking ports (7) are formed in the two annular flow cavities (10), one of the annular flow cavities is communicated with the inlet end (4) through the air inlet (9) formed in the inner arm ring of the connecting valve (3), and the other annular flow cavity (10) is communicated with the outlet end (5) through the air inlet (9) formed in the inner arm ring of the connecting valve (3).
2. Peripheral sampling differential pressure sensor for gas flow collection according to claim 1, characterized in that the front flow tube (1), the rear flow tube (2) and the connecting valve (3) have smooth inner walls without obstacles.
3. Perimeter sampling differential pressure sensor for gas flow collection according to claim 1, characterized in that the front flow tube (1) is provided with several circular filter screens (6) at a position close to the inlet end (4).
4. Perimeter sampling differential pressure sensor for gas flow collection according to claim 1, characterized in that a front flow tube (1) and a rear flow tube (2) are inwardly angled, the connection valve (3) connecting the front flow tube (1) and the rear flow tube (2).
5. Peripheral sampling differential pressure sensor for gas flow collection according to claim 1, characterized in that several gas inlets (9) are provided in the connection ports of the front flow tube (1) and the rear flow tube (2) and the connection valve (3).
6. Peripheral sampling differential pressure sensor for gas flow collection according to claim 1, characterized in that the connection valve is internally provided with an annular flow channel (10) communicating with a plurality of gas inlets (9) of the inner rings of the front flow tube (1) and the rear flow tube (2).
7. Peripheral sampling differential pressure sensor for gas flow collection according to claim 1, characterized in that the connecting valve (3) is peripherally provided with a sampling port (8).
8. Peripheral sampling differential pressure sensor for gas flow collection according to claim 1, characterized in that the connection valve (3) is peripherally provided with an integrated snap (11).
9. Peripheral sampling differential pressure sensor for gas flow collection according to claim 1, characterized in that two layers of isolated annular flow channels (10) are provided in the connecting valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010168779.3A CN111238581A (en) | 2020-03-12 | 2020-03-12 | Peripheral sampling differential pressure sensor for gas flow collection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010168779.3A CN111238581A (en) | 2020-03-12 | 2020-03-12 | Peripheral sampling differential pressure sensor for gas flow collection |
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| Publication Number | Publication Date |
|---|---|
| CN111238581A true CN111238581A (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010168779.3A Pending CN111238581A (en) | 2020-03-12 | 2020-03-12 | Peripheral sampling differential pressure sensor for gas flow collection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022110710A1 (en) * | 2020-11-30 | 2022-06-02 | 深圳市科曼医疗设备有限公司 | Differential-pressure flow sensor and ventilator |
-
2020
- 2020-03-12 CN CN202010168779.3A patent/CN111238581A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022110710A1 (en) * | 2020-11-30 | 2022-06-02 | 深圳市科曼医疗设备有限公司 | Differential-pressure flow sensor and ventilator |
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