CN219104927U - Expiration nitric oxide detector - Google Patents
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- CN219104927U CN219104927U CN202223561230.4U CN202223561230U CN219104927U CN 219104927 U CN219104927 U CN 219104927U CN 202223561230 U CN202223561230 U CN 202223561230U CN 219104927 U CN219104927 U CN 219104927U
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Abstract
An expired air nitric oxide detector comprises a sampling end, a gas storage device, a first exhaust device, an air exhaust device, a nitric oxide detection sensor, a nitric oxide removal device, a first three-way electromagnetic valve and a second exhaust device; the sampling end, the gas storage device and the exhaust device are sequentially connected in series through a pipeline to form a sampling gas path for collecting and storing an expired gas sample; the gas storage device, the air exhaust device and the nitric oxide detection sensor are sequentially connected in series through a pipeline to form a closed measurement gas path for measuring nitric oxide in an expired gas sample; the nitric oxide removing device is connected in parallel on a pipeline between the gas storage device and the air exhaust device through a three-way electromagnetic valve I, and forms a calibration gas circuit for zeroing and calibrating the nitric oxide detection sensor with the closed measurement gas circuit; the sampling air passage, the air exhaust device and the exhaust device are sequentially connected in series to form an air exhaust air passage or a cleaning air passage for cleaning the pipeline. The whole gas circuit system has the advantages of few structures, simple circuits, long service life of the sensor and high measurement accuracy.
Description
Technical Field
The utility model relates to the field of medical appliances, in particular to an expired nitric oxide detector.
Background
Exhaled nitric oxide (FeNO) is considered a sensitive indicator of eosinophilic inflammation in the airways, and detection methods of FeNO have been used to assess and predict patient response in anti-inflammatory therapies, as well as to monitor patient compliance.
Traditional nitric oxide detector can be through using mouthful breathe, in three kinds of modes such as the air pocket storage under nasal part extraction gas and off-line state sample, carries the concentration that detects the nitric oxide of exhaling to the sensor again after the sample, still need mark the operation of zeroing after detecting, still need carry out the cleaning operation after long-time use to guarantee measuring accuracy.
In the nitric oxide detection gas circuit system under various mode integration, the following defects exist: the valve and pump body structure is more, and circuit structure is complicated, leads to equipment cost high, and required installation space is great.
Therefore, how to solve the above-mentioned drawbacks of the prior art is a subject to be studied and solved by the present utility model.
Disclosure of Invention
The utility model aims to provide an expired nitric oxide detector.
In order to achieve the above purpose, the utility model adopts the following technical scheme: an expired air nitric oxide detector comprises a sampling end, a gas storage device, a first exhaust device, an air exhaust device, a nitric oxide detection sensor, a nitric oxide removal device, a first three-way electromagnetic valve and a second exhaust device;
the sampling end, the gas storage device and the first exhaust device are sequentially connected in series through a pipeline to form a sampling gas path for collecting and storing an expired gas sample;
the gas storage device, the air exhaust device and the nitric oxide detection sensor are sequentially connected in series through pipelines to form a closed measurement gas path for measuring nitric oxide in the expired air sample;
the nitric oxide removing device is connected in parallel to a pipeline between the gas storage device and the air exhaust device through a three-way electromagnetic valve I, and forms a calibration gas circuit for zeroing and calibrating the nitric oxide detection sensor with the closed measurement gas circuit;
the sampling gas circuit, the air extracting device and the air exhausting device II are sequentially connected in series to form an air extracting gas circuit or a cleaning gas circuit for cleaning the pipeline.
In the whole technical scheme, feNO can be realized 50 Exhalation, off-line/FNNO extraction, nitric oxide measurement, calibration, cleaning and other modes.
FeNO 50 Exhalation mode: the sampling end is connected with the mouth of the user, and the exhaled gas enters and is stored in the gas storage device through the sampling end, and the redundant gas is discharged through the first exhaust device.
offline/FnNO bleed mode: when the sampling end is connected with the nose of a user or the expired air storage air bag in an off-line state, the air extraction device is required to be used for extracting air, the extracted air is stored in the air storage device, and the redundant air is discharged through the second air discharge device.
Measurement mode: the sampling end is disconnected with the gas storage device, the gas in the gas storage device is extracted by the gas extraction device and is conveyed to the nitric oxide detection sensor for nitric oxide detection, and then the nitric oxide detection sensor returns to the gas storage device, and the measurement can be repeated for several times.
Calibration mode: the sampling end is disconnected with the gas storage device, the gas in the gas storage device is extracted by the gas extraction device and is conveyed to the nitric oxide removal device to remove nitric oxide in the gas, and the nitric oxide is returned to the gas storage device, so that the process gas is not discharged, and the nitric oxide detection sensor is calibrated in a zeroing mode so as to be convenient for the next measurement.
Cleaning mode: the sampling end is communicated with the gas storage device, the air extractor is started, external air enters the cleaning gas circuit through the sampling end, firstly passes through the gas storage device in the cleaning gas circuit, drives out the gas in the gas storage device to the nitric oxide removing device for cleaning, and finally is discharged to the atmosphere through the second exhaust device.
According to a further technical scheme, the sampling end comprises a constant-current valve and an air inlet valve, the input end of the constant-current valve is connected with the mouth part, the nose part or carries the expired air sample carrier through an air inlet pipeline, and the output end of the constant-current valve is connected with the air storage device through the air inlet valve. The constant flow valve is controlled by the stepping motor, so that the control of the air inlet flow is stable, and the constant flow valve is communicated with or disconnected from the air storage device through the air inlet valve.
According to a further technical scheme, the first exhaust device comprises an exhaust pipeline connected with the output end of the gas storage device, the exhaust pipeline is provided with a first exhaust valve, and the first exhaust valve is a two-way electromagnetic valve. When the exhaust valve is opened, the exhaust valve is opened; and when the device is measured, calibrated and cleaned, the exhaust valve is closed.
According to a further technical scheme, the sampling end further comprises an air pressure measuring device which is used for monitoring the air inlet pressure of the expired air sample in real time and adjusting the flow aperture of the constant flow valve according to the air inlet pressure, the air pressure measuring device is connected to the constant flow valve and can dynamically adjust the flow aperture of the constant flow valve by detecting the expired air pressure in real time, so that the flow control in the expired air process is more stable, and the air pressure measuring device can adopt a barometer or a pressure sensor.
According to a further technical scheme, the sampling end further comprises an expiration resistance balance pipeline and a second exhaust valve connected to the expiration resistance balance pipeline, the second exhaust valve is a two-way electromagnetic valve, the expiration resistance balance pipeline is connected with an exhaust port of the constant flow valve, and the second exhaust valve is electrically connected with the air pressure measuring device. When the FenO200 exhales, the exhaust valve II can be opened at the moment due to the large airflow rate, so that a part of exhales is discharged from the exhaled resistance balance pipeline, and the exhaled resistance is reduced.
According to a further technical scheme, the air inlet valve adopts a two-way electromagnetic valve or a two-way electromagnetic valve;
one passage of the second three-way electromagnetic valve is connected with an air outlet pipeline of the constant flow valve, and the other two passages are respectively connected with an input end pipeline of the air storage device;
one passage of the two-way electromagnetic valve is connected with the air outlet pipeline of the constant flow valve, and the other passage is connected with the input end pipeline of the air storage device.
According to a further technical scheme, the input end of the nitric oxide removing device is connected with the output end of the air storage device through a first three-way electromagnetic valve, two passages of the first three-way electromagnetic valve are connected to a pipeline between the air storage device and the air exhaust device, and the remaining passage is connected with the nitric oxide removing device; the nitric oxide removing device is a potassium permanganate tank. In the measurement mode, the nitrogen monoxide removing device is isolated by the first three-way electromagnetic valve, and in the cleaning mode, the gas is led out into the nitrogen monoxide removing device by the first three-way electromagnetic valve for cleaning.
According to a further technical scheme, the air extracting device adopts a variable speed pump; and the exhaust device II comprises a three-way electromagnetic valve III, two passages of the three-way electromagnetic valve III are connected to a pipeline between the variable speed pump and the nitric oxide sensor, and the remaining passage is connected with the atmosphere.
When the air extractor adopts a variable speed pump, the variable speed pump can comprise a large pumping speed and a small pumping speed, and can replace two constant speed pumps, thereby saving the cost and the installation space.
In the cleaning mode, the three-way electromagnetic valve III is closed to close the measuring gas path, and the remaining one path is opened to be connected with the atmosphere; the measurement and calibration modes are reversed.
When the air inlet valve adopts the three-way electromagnetic valve II, the three-way electromagnetic valve III is matched for use, and the nitric oxide detection sensor can be isolated, so that the test of the sensor can not be interfered even if the sensor has poor sealing.
When a two-way solenoid valve is used for the inlet valve, the sensor cannot be isolated.
The variable speed pump, the three-way electromagnetic valve III and the three-way electromagnetic valve II are matched for use, so that the variable speed pump, the three-way electromagnetic valve III and the three-way electromagnetic valve II are optimal schemes of the whole technical scheme, the whole gas circuit system is small in structure, the circuit is simple, the service life of the sensor is long, and the measuring precision is high.
According to a further technical scheme, the measuring gas circuit further comprises the nitric oxide removing device which is connected in parallel with the pipeline between the gas storage device and the air exhaust device through the three-way electromagnetic valve, and the inside of the nitric oxide removing device can be cleaned.
According to a further technical scheme, the air extractor adopts a high-flow constant-speed pump and a low-flow constant-speed pump; the air inlet end of the high-flow constant-speed pump is connected with the remaining one passage, and the air outlet end is connected with the atmosphere; the small-flow constant-speed pump is connected in series at the rear section of the closed measuring gas circuit; and the second exhaust device comprises a high-flow constant-speed pump.
In the cleaning mode, the high-flow constant-speed pump is started, and the low-flow constant-speed pump is closed; the measurement and calibration modes are reversed.
The scheme adopts two constant-speed pumps, has higher cost and larger installation space, and has slightly complicated circuits, but is superior to the prior art.
The working principle and the advantages of the utility model are as follows:
1. the whole device adopts the variable speed pump to replace another constant speed pump in the prior art for use, is matched with a three-way electromagnetic valve capable of being used for exhausting, can finish the work of expiration, air extraction, measurement, calibration and cleaning, and has the advantages of simple structure of the whole air path system, few pipelines, few valve structures, and great cost and installation space saving.
2. Through all setting up a three way solenoid valve at the front and back section of nitric oxide detection sensor connection gas circuit, can keep apart the sensor, avoid the interference of non-test gas to the sensor, even the sensor appears sealed poorly simultaneously, exhale and bleed the process and also can not produce the interference to the sensor, sensor long service life, measurement accuracy is high.
3. Through using the constant flow valve by step motor control at the import department of sampling end to utilize barometer or pressure sensor real-time detection expiration pressure, so the circulation aperture of dynamic adjustment constant flow valve, and then can make the flow control of expiration process more steady.
Drawings
FIG. 1 is a schematic diagram of a gas circuit system according to embodiment 1 of the present utility model;
FIG. 2 is a schematic diagram of the gas circuit system in embodiment 2 of the present utility model;
fig. 3 is a schematic diagram of a gas circuit system in embodiment 3 of the present utility model.
In the above figures: 1. a sampling end; 110. a constant flow valve; 121. a three-way electromagnetic valve II; 122. a two-way solenoid valve; 130. an air pressure measuring device; 140. an exhaust valve II; 2. a gas storage device; 3. an exhaust device I; 410. a variable speed pump; 421. a high-flow constant-speed pump; 422. a small flow constant speed pump; 5. a nitric oxide detection sensor; 6. a nitric oxide removal device; 7. a three-way electromagnetic valve I; 8. and a second exhaust device.
Detailed Description
The utility model is further described below with reference to the accompanying drawings and examples:
examples: the present utility model will be described in detail with reference to the drawings, wherein modifications and variations are possible in light of the teachings of the present utility model, without departing from the spirit and scope of the present utility model, as will be apparent to those of skill in the art upon understanding the embodiments of the present utility model.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. Singular forms such as "a," "an," "the," and "the" are intended to include the plural forms as well, as used herein.
The terms "first," "second," and the like, as used herein, do not denote a particular order or sequence, nor are they intended to be limiting, but rather are merely used to distinguish one element or operation from another in the same technical term.
As used herein, the terms "comprising," "including," "having," and the like are intended to be open-ended terms, meaning including, but not limited to.
The term (terms) as used herein generally has the ordinary meaning of each term as used in this field, in this disclosure, and in the special context, unless otherwise noted. Certain terms used to describe the present disclosure are discussed below, or elsewhere in this specification, to provide additional guidance to those skilled in the art in connection with the description herein.
Example 1
Referring to fig. 1, an expired air nitric oxide detector comprises a sampling end 1, a gas storage device 2, an exhaust device I3, an air exhaust device, a nitric oxide detection sensor 5, a nitric oxide removal device 6, a three-way electromagnetic valve I7 and an exhaust device II 8.
The sampling end 1 comprises a constant flow valve 110, an air inlet valve, an air pressure measuring device 130 for monitoring the air inlet pressure of the expired air sample in real time and adjusting the flow aperture of the constant flow valve 110 according to the air inlet pressure, an expired air resistance balance pipeline and an exhaust valve II 140 connected to the expired air resistance balance pipeline.
The input end of the constant flow valve 110 is connected with the mouth part, the nose part or the carrier for carrying the expired air sample through an air inlet pipeline, and the output end is connected with the air storage device 2 through the air inlet valve. The constant flow valve 110 is controlled by a stepping motor, so that the control of the air inlet flow is stable, and the constant flow valve 110 is communicated with or disconnected from the air storage device 2 through an air inlet valve.
The air inlet valve adopts a three-way electromagnetic valve II 121, one passage of the three-way electromagnetic valve II 121 is connected with an air outlet pipeline of the constant flow valve 110, and the other two passages are respectively connected with an input end pipeline of the air storage device 2.
The air pressure measuring device 130 is connected to the constant flow valve 110, and can detect the expiratory pressure in real time to dynamically adjust the flow aperture of the constant flow valve 110, so that the flow control in the expiratory process is more stable, and the air pressure measuring device 130 can use an air pressure gauge or a pressure sensor.
The second exhaust valve 140 is a two-way electromagnetic valve V1, the exhalation resistance balance pipe is connected to the exhaust port of the constant flow valve 110, and the second exhaust valve 140 is electrically connected to the air pressure measuring device 130.
The first exhaust device 3 comprises an exhaust pipeline connected with the output end of the gas storage device 2, and an exhaust valve I is arranged on the exhaust pipeline and is a two-way electromagnetic valve V3.
The input end of the nitric oxide removing device 6 is connected with the output end of the air storage device 2 through a first three-way electromagnetic valve 7, two passages of the first three-way electromagnetic valve 7 are connected to a pipeline between the air storage device 2 and the air exhaust device, and the remaining passage is connected with the nitric oxide removing device 6; the nitric oxide removing device 6 is a potassium permanganate tank. In the measurement mode, the nitrogen monoxide removal device 6 is isolated by the first three-way electromagnetic valve 7, and in the cleaning mode, the first three-way electromagnetic valve 7 guides gas into the nitrogen monoxide removal device 6 for cleaning.
The pumping device employs a variable speed pump 410 that includes a large pumping rate and a small pumping rate, and pumping and cleaning modes can be pumped at a large rate and the remaining modes can be pumped at a small rate.
The second exhaust device 8 comprises a three-way electromagnetic valve three, two passages of the three-way electromagnetic valve are connected to a pipeline between the variable speed pump 410 and the nitric oxide sensor, and the remaining passage is connected to the atmosphere.
The sampling end 1, the gas storage device 2 and the first exhaust device 3 are sequentially connected in series through a pipeline to form a sampling gas circuit for collecting and storing an expired gas sample. Specific:
FeNO 50 exhalation mode: the sampling end 1 is connected with the mouth of a user through a sampling handle, exhaled air enters and is stored in the air storage device 2 through the sampling end 1, the two-way electromagnetic valve V3 is opened, and redundant air is discharged through an exhaust pipeline.
When the FenO200 exhales, the exhaust valve II 140 can be opened at the moment due to the large airflow rate, so that a part of exhales is discharged from the exhaled resistance balance pipeline to reduce the exhaled resistance.
The sampling gas circuit, the air extracting device and the exhaust device II 8 are sequentially connected in series to form an air extracting gas circuit. In particular, the method comprises the steps of,
offline/FnNO bleed mode: when the sampling end 1 is connected with the nose of a user or the expired air storage air bag in an off-line state, the air extraction device is required to be used for extracting air, the extracted air is stored in the air storage device 2, and the redundant air is discharged through the three-way electromagnetic valve.
The gas storage device 2, the air exhaust device and the nitric oxide detection sensor 5 are sequentially connected in series through pipelines to form a closed measuring gas path for measuring nitric oxide in the expired air sample. In particular, the method comprises the steps of,
measurement mode: the sampling end 1 is disconnected from the gas storage device 2 by the three-way electromagnetic valve II 121, the gas in the gas storage device 2 is pumped by the gas pumping device and is conveyed to the nitric oxide detection sensor 5 for nitric oxide detection, and then the nitric oxide is returned to the gas storage device 2, and the measurement can be repeated for several times.
The nitric oxide removing device 6 is connected in parallel to a pipeline between the gas storage device 2 and the air exhaust device through a first three-way electromagnetic valve 7, and forms a calibration gas circuit for zeroing and calibrating the nitric oxide detection sensor 5 with the closed measurement gas circuit. In particular, the method comprises the steps of,
calibration mode: the sampling end 1 is disconnected from the gas storage device 2 by the three-way electromagnetic valve II 121, the gas in the gas storage device 2 is pumped by the gas pumping device and is conveyed to the potassium permanganate tank, nitric oxide in the gas is removed by the potassium permanganate and then returned to the gas storage device 2, the process gas is not discharged, and the nitric oxide detection sensor 5 is calibrated in a zeroing mode so as to be convenient for the next measurement.
The sampling gas circuit, the nitric oxide removing device 6, the air extracting device and the air exhausting device II 8 are sequentially connected in series to form a cleaning gas circuit for cleaning the pipeline. In particular, the method comprises the steps of,
cleaning mode: the sampling end 1 is communicated with the gas storage device 2 by the three-way electromagnetic valve II 121, the three-way electromagnetic valve III is used for opening and closing a measuring loop and communicating with the atmosphere, the air extractor is started, external air enters a cleaning air path through the sampling end 1, firstly passes through the gas storage device 2 in the cleaning air path, drives out the gas in the cleaning air path into the nitric oxide removing device 6 for cleaning, and finally is discharged to the atmosphere through the three-way electromagnetic valve III.
When the cleaning gas path does not comprise the nitric oxide removing device 6, only the sampling gas path and the closed measuring gas path at the front section of the nitric oxide detection sensor 5 are cleaned.
In the whole technical scheme, feNO can be realized 50 Expiration, feNO200 expiration, off-line/FNNO bleed, nitric oxide measurementVarious modes such as measuring, calibrating and cleaning.
And the three-way electromagnetic valve II 121 and the three-way electromagnetic valve III are matched for use, the nitric oxide detection sensor 5 can be isolated, and even if the sensor has poor sealing, the test of the sensor can not be interfered in the processes of expiration and air extraction.
The use of one variable speed pump 410 instead of two constant speed pumps can save cost and installation space.
The technical scheme of the embodiment is an optimal scheme, the whole gas circuit system has the advantages of less structure, simple circuit, long service life of the sensor and high measurement accuracy.
Example 2
Referring to fig. 2, this embodiment is substantially the same as embodiment 1, except that: the air inlet valve adopts a two-way electromagnetic valve 122 (V2), one passage of the two-way electromagnetic valve 122 is connected with the air outlet pipeline of the constant flow valve 110, and the other passage is connected with the input end pipeline of the air storage device 2.
The scheme can also realize FeNO 50 Expiration, feNO200 expiration, off-line/FNNO bleed, nitric oxide measurement, calibration, and cleaning.
However, the nitric oxide detecting sensor 5 cannot be isolated, and if the sensor is poorly sealed, the test of the sensor will be disturbed during the expiration and the air extraction.
Example 3
Referring to fig. 3, this embodiment is substantially the same as embodiment 1, except that: the air extractor adopts a high-flow constant-speed pump 421 and a low-flow constant-speed pump 422; the air inlet end of the high-flow constant-speed pump 421 is connected with the remaining one passage, and the air outlet end is connected with the atmosphere; the small flow constant speed pump 422 is connected in series at the rear section of the closed measuring gas path.
The second exhaust device 8 includes a high-flow constant-speed pump 421.
This solution uses two constant speed pumps instead of the variable speed pump 410, and increases the cost and installation space.
FeNO 50 The exhalation mode and the FeNO200 exhalation mode are the same as in example 1.
In the off-line/FNNO pumping mode, the high-flow constant-speed pump 421 is started to pump air, the pumped air is stored in the air storage device 2, and the redundant air is discharged through the high-flow constant-speed pump 421.
In the measurement mode and the calibration mode, the high flow rate constant speed pump 421 is turned off, and the low flow rate constant speed pump 422 is turned on for pumping.
In the cleaning mode, the high-flow constant-speed pump 421 is turned on, the low-flow constant-speed pump 422 is turned off, and at this time, the gas does not pass through the nitric oxide removing device 6, the nitric oxide removing device 6 is not cleaned, and the normal use is not affected because of the potassium permanganate contained in the nitric oxide removing device.
In addition, in this solution, the sensor cannot be isolated. And the scheme adopts two constant-speed pumps, has higher cost and larger installation space, and has slightly complicated circuits, but is superior to the prior art.
The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.
Claims (10)
1. An exhale nitric oxide detector, characterized in that: the device comprises a sampling end (1), a gas storage device (2), an exhaust device I (3), an air extractor, a nitric oxide detection sensor (5), a nitric oxide removal device (6), a three-way electromagnetic valve I (7) and an exhaust device II (8);
the sampling end (1), the gas storage device (2) and the first exhaust device (3) are sequentially connected in series through a pipeline to form a sampling gas path for collecting and storing an expired gas sample;
the gas storage device (2), the air exhaust device and the nitric oxide detection sensor (5) are sequentially connected in series through pipelines to form a closed measurement gas path for measuring nitric oxide in the expired gas sample;
the nitric oxide removing device (6) is connected in parallel with a pipeline between the gas storage device (2) and the air exhaust device through a first three-way electromagnetic valve (7), and forms a calibration gas circuit for zeroing and calibrating the nitric oxide detection sensor (5) with the closed measurement gas circuit;
the sampling gas circuit, the air extracting device and the air exhausting device II (8) are sequentially connected in series to form an air extracting gas circuit or a cleaning gas circuit for cleaning the pipeline.
2. The exhaled nitric oxide detector according to claim 1, wherein: the first exhaust device (3) comprises an exhaust pipeline connected with the output end of the gas storage device (2), and an exhaust valve I is arranged on the exhaust pipeline.
3. The exhaled nitric oxide detector according to claim 1, wherein: the sampling end (1) comprises a constant flow valve (110) and an air inlet valve, the input end of the constant flow valve (110) is connected with the mouth part, the nose part or carries the expired air sample carrier through an air inlet pipeline, and the output end of the constant flow valve is connected with the air storage device (2) through the air inlet valve.
4. An expired nitric oxide detector according to claim 3, wherein: the sampling end (1) further comprises an air pressure measuring device (130) for monitoring the air inlet pressure of the expired air sample in real time and adjusting the flow aperture of the constant flow valve (110) according to the air inlet pressure, and the air pressure measuring device (130) is connected to the constant flow valve (110).
5. The exhaled nitric oxide detector according to claim 4, wherein: the sampling end (1) further comprises an exhalation resistance balance pipeline and a second exhaust valve (140) connected to the exhalation resistance balance pipeline, the exhalation resistance balance pipeline is connected with an exhaust port of the constant flow valve (110), and the second exhaust valve (140) is electrically connected with the air pressure measuring device (130).
6. An expired nitric oxide detector according to claim 3, wherein: the air inlet valve adopts a three-way electromagnetic valve II (121) or a two-way electromagnetic valve (122);
one passage of the three-way electromagnetic valve II (121) is connected with an air outlet pipeline of the constant flow valve (110), and the other two passages are respectively connected with an input end pipeline of the air storage device (2);
one passage of the two-way electromagnetic valve (122) is connected with an air outlet pipeline of the constant flow valve (110), and the other passage is connected with an input end pipeline of the air storage device (2).
7. The exhaled nitric oxide detector according to claim 1, wherein: the input end of the nitric oxide removing device (6) is connected with the output end of the air storage device (2) through a first three-way electromagnetic valve (7), two passages of the first three-way electromagnetic valve (7) are connected to a pipeline between the air storage device (2) and the air exhaust device, and the remaining passage is connected with the nitric oxide removing device (6); the nitric oxide removing device (6) is a potassium permanganate tank.
8. The exhaled nitric oxide detector according to claim 1, wherein: the air extraction device adopts a variable speed pump (410); the exhaust device II (8) comprises a three-way electromagnetic valve III, two passages of the three-way electromagnetic valve III are connected to a pipeline between the variable speed pump (410) and the nitric oxide sensor, and the rest passage is connected with the atmosphere.
9. The exhaled nitric oxide detector according to claim 8, wherein: the measuring gas circuit further comprises a nitric oxide removing device (6) which is connected in parallel on a pipeline between the gas storage device (2) and the air exhaust device through a first three-way electromagnetic valve (7).
10. The exhaled nitric oxide detector according to claim 7, wherein: the air extractor adopts a high-flow constant-speed pump (421) and a low-flow constant-speed pump (422); the air inlet end of the high-flow constant-speed pump (421) is connected with the remaining one passage, and the air outlet end is connected with the atmosphere; the small-flow constant-speed pump (422) is connected in series at the rear section of the closed measuring gas circuit; the second exhaust device (8) comprises a high-flow constant-speed pump (421).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117347609A (en) * | 2023-12-04 | 2024-01-05 | 深圳市瑞利医疗科技有限责任公司 | Detection gas circuit and expiration diagnostic apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117347609A (en) * | 2023-12-04 | 2024-01-05 | 深圳市瑞利医疗科技有限责任公司 | Detection gas circuit and expiration diagnostic apparatus |
| CN117347609B (en) * | 2023-12-04 | 2024-03-22 | 深圳市瑞利医疗科技有限责任公司 | Detection gas circuit and expiration diagnostic apparatus |
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