Electronic nose system for monitoring indoor air quality

Abstract

The invention discloses an electronic nose system for monitoring indoor air quality. The electronic nose system comprises a vacuum pump assembly, a flowmeter assembly, a two-position three-way valve assembly, a two-position two-way valve assembly, a reaction chamber, an air inlet and an air outlet. The system can be switched into different channels by adjusting the vacuum pump assembly, the flow meter assembly, the two-position three-way valve assembly and the two-position two-way valve assembly, then the flow direction and the flow speed of standard gas and sampling gas are controlled, a reaction chamber with a sensing chamber array is connected into the channels, and calibration of the system and detection of the gas are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of air monitoring, and in particular relates to an electronic nose system for indoor air quality monitoring. Background Art

[0002] As residents' living standards continue to improve, they pay more and more attention to indoor air quality. Many air quality monitoring systems have appeared on the market that can be used in homes, offices, public places, industrial production and other fields.

[0003] There are two main defects in the existing air quality monitoring system: 1. It cannot comprehensively judge the air quality, and mostly uses formaldehyde or PM2.5 as the main measurement objects, and can often only measure a single data; 2. Due to unreasonable circuit settings, especially during calibration and testing, the gas flow direction is unreasonable, resulting in inaccurate monitoring results. Summary of the invention

[0004] The purpose of the present invention is to provide an electronic nose system for indoor air quality monitoring to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides an electronic nose system for indoor air quality monitoring, comprising an air inlet, a reaction chamber and an exhaust port; the air inlet and the exhaust port are respectively arranged at two ends of the reaction chamber; the air inlet, the reaction chamber and the exhaust port are also connected by arranging a vacuum pump assembly, a flow meter assembly, a two-position three-way valve assembly and a two-position two-way valve assembly; the reaction chamber comprises a first reaction chamber, a second reaction chamber and a third reaction chamber, and different sensor arrays are arranged in each of them; wherein the sensor array is used for rapid identification and quantitative analysis of indoor air components.

[0006] Furthermore, the air inlet includes a first air inlet, a second air inlet and a third air inlet; the exhaust port includes a first exhaust port and a second exhaust port; the vacuum pump assembly includes a first vacuum pump and a second vacuum pump; the flow meter assembly includes an electronic flow meter and a manual flow meter; the two-position three-way valve assembly includes a first two-position three-way valve, a second two-position three-way valve, a third two-position three-way valve and a fourth two-position three-way valve; the two-position two-way valve assembly includes a first two-position two-way valve, a second two-position two-way valve, a third two-position two-way valve and a fourth two-position two-way valve; wherein, the vacuum pump assembly can generate a pressure difference, which is used to allow the gas to be detected to quickly enter the reaction chamber, and quickly release the gas from the reaction chamber after the detection is completed; the flow meter assembly is used to control the flow rate of the gas; the two-position three-way valve assembly and the two-position two-way valve assembly are used to control the flow direction of the gas and switch to different fluid channels.

[0007] Furthermore, the sensor array in the first reaction chamber includes one sensor for detecting oxygen and one sensor for detecting carbon dioxide, and the sensor for detecting carbon dioxide is an infrared detection sensor.

[0008] Furthermore, the sensor array in the second reaction chamber includes a total of 6 sensors for detecting alkanes and reducing gases.

[0009] Furthermore, the sensor array in the third reaction chamber includes a total of 8 sensors for detecting volatile organic compounds.

[0010] Furthermore, the first air inlet and the second air inlet are connected to the third two-way three-way valve via the first two-way three-way valve and the second two-way three-way valve in sequence, and the third air inlet is directly connected to the third two-way three-way valve; the third two-way three-way valve is then connected to the reaction chamber via the first vacuum pump, the electronic flowmeter, and the first two-way two-way valve 1 in sequence; the reaction chamber is then connected to the exhaust port via the second vacuum pump, the manual flowmeter and the fourth two-way three-way valve in sequence.

[0011] The present invention also provides a method for indoor air quality monitoring, comprising the following steps: Step 1: allowing standard gas to enter from the first air inlet, and pass through the first two-position three-way valve, the second two-position three-way valve, the third two-position three-way valve, the first vacuum pump and the electronic flowmeter in sequence, and enter the reaction chamber to calibrate the sensor array in the reaction chamber; Step 2: After the sensor array is calibrated, allowing the standard gas to be slowly released from the exhaust port from the reaction chamber through the second vacuum pump, the manual flowmeter and the fourth two-position three-way valve in sequence; Step 3: After the standard gas is released, allowing the sampling gas to pass through the second air inlet, the first two-position three-way valve, the second two-position three-way valve, the third two-position three-way valve, the first vacuum pump, the electronic flowmeter and the first two-position two-way valve in sequence to enter the reaction chamber, and after the sampling gas fills the reaction chamber, read the reading of the sensor array.

[0012] Furthermore, the corresponding component states in step 1 are: the electronic flowmeter is adjusted to an initial value, the second two-position three-way valve and the third two-position three-way valve are energized, the first two-position two-way valve is energized, and the first vacuum pump is started.

[0013] Furthermore, the corresponding component states in step 2 are: the second two-position two-way valve, the two third-position two-way valves, and the fourth two-position two-way valve are energized, the second vacuum pump is started, and the manual flow meter is adjusted.

[0014] Furthermore, the states of the corresponding components in step 3 are: the second two-position three-way valve, the third two-position three-way valve, the first two-position two-way valve, and the first vacuum pump are powered off; the manual flow meter is adjusted to start the second vacuum pump; the first two-position three-way valve, the second two-position three-way valve, the third two-position three-way valve, and the first two-position two-way valve are powered on respectively, and the first vacuum pump is started; the second two-position two-way valve, the third two-position two-way valve, the fourth two-position two-way valve, and the fourth two-position three-way valve are powered on respectively, and the second vacuum pump is powered on.

[0015] The technical effect of the present invention is as follows: in the present invention, the flow direction and flow rate of the gas in the entire electronic nose system can be controlled by cooperating with the vacuum pump assembly, the flow meter assembly, the two-position three-way valve assembly and the two-position two-way valve assembly. In addition, a reaction chamber with a sensor array is arranged in the system to realize the calibration of the system and the multi-dimensional detection of the standard gas, thereby ensuring the high precision and multi-dimensional monitoring of the gas of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 Schematic diagram of the structure of the electronic nose system of the present invention.

[0018] In the figure, 1, first air inlet; 2, second air inlet; 3, first two-position three-way valve 3; 4, second two-position three-way valve; 5, third two-position three-way valve; 6, first vacuum pump; 7, electronic flow meter; 8, first two-position two-way valve; 9, first reaction chamber; 10, second reaction chamber; 11, third reaction chamber; 12, second two-position two-way valve; 13, third two-position two-way valve; 14, fourth two-position two-way valve; 15, second vacuum pump; 16, manual flow meter; 17, fourth two-position three-way valve; 18, first exhaust port; 19, second exhaust port; 20, third air inlet. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] In the following description of different exemplary embodiments of the present invention, reference is made to the accompanying drawings, which form a part of the present invention and in which different exemplary structures, systems and steps that can implement multiple aspects of the present invention are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the present invention. Moreover, although the terms "above", "between", "within", etc. may be used in this specification to describe different exemplary features and elements of the present invention, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention.

[0021] See also Figure 1 , which is a representative structural diagram of the electronic nose system proposed in the present invention. In this embodiment, the electronic nose system proposed in the present invention is described by taking the application of indoor air monitoring as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of the present invention to the detection of other gases or other processes, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the electronic nose system proposed in the present invention.

[0022] like Figure 1 As shown, in this embodiment, the present invention proposes an electronic nose system for indoor air quality monitoring. The structure, connection method and functional relationship of the main components of the electronic nose system proposed by the present invention are described in detail below in conjunction with the above drawings.

[0023] like Figure 1 As shown, in this embodiment, it mainly includes: an air inlet, a reaction chamber and an exhaust port. The air inlet and the exhaust port are respectively arranged at the two ends of the reaction chamber, and the reaction chamber is provided with a sensor array, and the sensor array is used to quickly identify and quantitatively analyze the indoor air components. The air inlet, the reaction chamber and the exhaust port are also connected by arranging a vacuum pump assembly, a flow meter assembly, a two-position three-way valve assembly and a two-position two-way valve assembly.

[0024] Specifically: the flow meter assembly includes an electronic flow meter 7 and a manual flow meter 16, the two-position three-way valve assembly includes a first two-position three-way valve 3, a second two-position three-way valve 4, a third two-position three-way valve 5, and a fourth two-position three-way valve 17; the two-position two-way valve assembly includes a first two-position two-way valve 8, a second two-position two-way valve 12, a third two-position two-way valve 13, and a fourth two-position two-way valve 14; the reaction chamber includes a first reaction chamber 9, a second reaction chamber 10, and a third reaction chamber 11; the air inlet includes a first air inlet 1, a second air inlet, and a third air inlet; the exhaust port includes a first exhaust port 18 and a second exhaust port 19.

[0025] Wherein, the flow meter assembly is used to control the flow rate of the gas; the two-position three-way valve assembly and the two-position two-way valve assembly are used to control the flow direction of the gas and switch to different fluid channels.

[0026] The specific connection method of the system is: the first air inlet 1 and the second air inlet 2 are connected to the third two-position three-way valve 5 via the first two-position three-way valve 3 and the second two-position three-way valve 4 in sequence, and the third air inlet 20 is directly connected to the third two-position three-way valve 5; the third two-position three-way valve 5 is then connected to the reaction chamber via the first vacuum pump 6, the electronic flowmeter 7, and the first two-position two-way valve 3 in sequence; the reaction chamber is then connected to the exhaust port via the second vacuum pump 15, the manual flowmeter 16 and the fourth two-position three-way valve 17 in sequence.

[0027] The reaction chamber includes a first reaction chamber 9 , a second reaction chamber 10 and a third reaction chamber 11 . The first reaction chamber 9 is connected to a second two-position two-way valve 12 , the second reaction chamber 10 is connected to a third two-position two-way valve 13 , and the third reaction chamber 11 is connected to a fourth two-position two-way valve 14 .

[0028] The first reaction chamber 9 is provided with an oxygen sensor and a carbon dioxide sensor array for monitoring carbon dioxide and oxygen in the gas. The second reaction chamber 10 is provided with an alkane and reducing gas detection array for monitoring alkane gases such as methane, propane, butane, and reducing gases such as hydrogen and carbon monoxide. The third reaction chamber 11 is provided with a volatile organic compound (VOC) and other gas detection array for monitoring volatile organic compounds (VOC) such as ethanol, amines, hydrogen sulfide, aldehydes, lipids, ketones, etc.

[0029] A method for indoor air quality monitoring comprises the following steps:

[0030] Step 1: Adjust the electronic flowmeter 7 to the initial value, allow standard gas to enter the first air inlet 1, power on the first two-position three-way valve 3, the second two-position three-way valve 4, the third two-position three-way valve 5, the first two-position two-way valve 8, the first vacuum pump 6, the second two-position two-way valve 12, the third two-position two-way valve 13, the fourth two-position two-way valve 14, the second vacuum pump 15 and the fourth two-position three-way valve 17, and manually adjust the manual flowmeter 16.

[0031] Step 2: Turn off the power to the second two-position three-way valve 4, the third two-position three-way valve 5, the first two-position two-way valve 8 and the first vacuum pump 6, adjust the manual flow meter 16, and turn on the power to the second vacuum pump 15 to release the standard gas from the exhaust port.

[0032] Step 3: After the concentration of the standard gas in the reaction chamber decreases, the sampling gas enters the second air inlet 2, and the first two-position three-way valve 3, the second two-position three-way valve 4, the third two-position three-way valve 5, the first two-position two-way valve 8, and the first vacuum pump 6 are energized; finally, after the sampling gas fills the first reaction chamber 9, the second reaction chamber 10, and the third reaction chamber 11, the second two-position two-way valve 12, the third two-position two-way valve 13, the fourth two-position two-way valve 14, the second vacuum pump 15, and the fourth two-position three-way valve 17 are energized, and the manual flowmeter 16 is adjusted.

[0033] The working principle is as follows: first, the sampled gas enters the first reaction chamber 9, the second reaction chamber 10 and the third reaction chamber 11 respectively, and then passes through the second two-position two-way valve 12, the third two-position two-way valve 13 and the fourth two-position two-way valve 14 respectively, and then enters the second vacuum pump 15, the manual flow meter 16, and the manual flow meter 16 is manually adjusted to make the standard gas in the reaction chamber be released through the fourth two-position three-way valve and the exhaust port at a speed that is first fast and then slow. In this process, the value changes of the sensor are monitored, and when the value is stable, the sensor array is calibrated.

[0034] Secondly, after the sensor array is calibrated, the first air inlet 1 stops admitting standard gas, and the second vacuum pump 15 and the manual flowmeter 16 continue to work to slowly extract the standard gas in the first reaction chamber 9, the second reaction chamber 10 and the third reaction chamber 11, so that the air pressure in the first reaction chamber 9, the second reaction chamber 10 and the third reaction chamber 11 is reduced, and the sampling gas enters through the second air inlet 2, and passes through the first two-position three-way valve 3, the second two-position three-way valve 4, the third two-position three-way valve 5, the first vacuum pump 6, the electronic flowmeter 7, the first two-position two-way valve 8, and the sampling gas enters the first reaction chamber 9, the second reaction chamber 10 and the third reaction chamber 11 respectively, and the sampling gas is rapidly diffused in the reaction chamber through the pressure difference. When the sampling gas fills the air chamber, the sensor value is read.

[0035] The corresponding component states in step 1 are that the electronic flowmeter 7 is adjusted to the initial value, the second two-position three-way valve 4 and the third two-position three-way valve are powered on 5, the first two-position two-way valve 3 is powered on, and the first vacuum pump 6 is started.

[0036] The corresponding component states in step 2 are: the second two-position two-way valve 4 , the third two-position two-way valve 5 , and the fourth two-position two-way valve are powered on 14 , the second vacuum pump 15 is started, and the manual flow meter 16 is adjusted.

[0037] The corresponding component states in step 3 are: adjusting the manual flow meter 16, starting the second vacuum pump 15; energizing the first two-position three-way valve 3, the second two-position three-way valve 4, the third two-position three-way valve 5 and the first two-position two-way valve 8 respectively, and starting the first vacuum pump 6; energizing the second two-position two-way valve 12, the third two-position two-way valve 13, the fourth two-position two-way valve 14 and the fourth two-position three-way valve 17 respectively, and energizing the second vacuum pump 15.

[0038] In summary, the present invention utilizes a vacuum pump assembly, a flow meter assembly, a two-position three-way valve assembly, and a two-position two-way valve assembly to switch the system to a baseline adjustment channel, a sampling channel, and an enrichment channel. No additional system equipment is needed, which reduces costs. At the same time, the baseline adjustment channel, the sampling channel, and the enrichment channel ensure that the flow directions of the standard gas and the sampling gas are reasonable, and the interference factors are greatly reduced, so that the sensor array in the reaction chamber can avoid interference, and the monitoring results are more accurate. The sensor array in the reaction chamber can monitor multiple gases, thereby making the monitoring results more multidimensional.

[0039] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An electronic nose system for indoor air quality monitoring, characterized in that: including an air inlet, a reaction chamber and an exhaust port; The air inlet and the air outlet are respectively arranged at two ends of the reaction chamber; The air inlet, the reaction chamber and the exhaust port are also connected by arranging a vacuum pump assembly, a flow meter assembly, a two-position three-way valve assembly and a two-position two-way valve assembly; The reaction chambers include a first reaction chamber, a second reaction chamber and a third reaction chamber, and each of the reaction chambers is provided with a different sensor array; The sensor array is used for rapid identification and quantitative analysis of indoor air components.

2. The electronic nose system for indoor air quality monitoring according to claim 1, characterized in that: The air inlet comprises a first air inlet, a second air inlet and a third air inlet; The exhaust port comprises a first exhaust port and a second exhaust port; The vacuum pump assembly includes a first vacuum pump and a second vacuum pump; The flow meter assembly includes an electronic flow meter and a manual flow meter; The two-position three-way valve assembly comprises a first two-position three-way valve, a second two-position three-way valve, a third two-position three-way valve, and a fourth two-position three-way valve; The two-position two-way valve assembly comprises a first two-position two-way valve, a second two-position two-way valve, a third two-position two-way valve, and a fourth two-position two-way valve; The vacuum pump assembly can generate a pressure difference to allow the gas to be detected to quickly enter the reaction chamber, and quickly release the gas from the reaction chamber after the detection is completed; The flow meter assembly is used to control the flow rate of the gas; The two-position three-way valve assembly and the two-position two-way valve assembly are used to control the gas flow direction and switch to different fluid channels.

3. The electronic nose system for indoor air quality monitoring according to claim 2, characterized in that: The sensor array in the first reaction chamber includes one sensor for detecting oxygen and one sensor for detecting carbon dioxide, and the sensor for detecting carbon dioxide is an infrared detection sensor.

4. The electronic nose system for indoor air quality monitoring according to claim 2, characterized in that: The sensor array in the second reaction chamber includes 6 sensors for detecting alkanes and reducing gases.

5. The electronic nose system for indoor air quality monitoring according to claim 2, characterized in that: The sensor array in the third reaction chamber includes a total of 8 sensors for detecting volatile organic compounds.

6. The electronic nose system for indoor air quality monitoring according to claim 2, characterized in that: The first air inlet and the second air inlet are connected to the third two-position three-way valve via the first two-position three-way valve and the second two-position three-way valve in sequence, and the third air inlet is directly connected to the third two-position three-way valve; The third two-position three-way valve is then connected to the reaction chamber via the first vacuum pump, the electronic flow meter, and the first two-position two-way valve in sequence; The reaction chamber is then connected to the exhaust port via the second vacuum pump, the manual flow meter and the fourth two-position three-way valve in sequence.

7. A method for indoor air quality monitoring, characterized in that: The method comprises the following steps: Step 1: allowing standard gas to enter from the first gas inlet, and sequentially pass through the first two-position three-way valve, the second two-position three-way valve, the third two-position three-way valve, the first vacuum pump and the electronic flowmeter, and enter the reaction chamber to calibrate the sensor array in the reaction chamber; Step 2: After the sensor array is calibrated, the standard gas is slowly released from the reaction chamber through the second vacuum pump, the manual flow meter and the fourth two-position three-way valve from the exhaust port in sequence; Step 3: After the standard gas is released, the sampling gas is allowed to enter the reaction chamber through the second gas inlet, the first two-position three-way valve, the second two-position three-way valve, the third two-position three-way valve, the first vacuum pump, the electronic flow meter and the first two-position two-way valve in sequence, and after the sampling gas fills the reaction chamber, the reading of the sensor array is read.

8. The method for indoor air quality monitoring according to claim 7, characterized in that: The corresponding component states in step 1 are: the electronic flowmeter is adjusted to the initial value, the second two-position three-way valve and the third two-position three-way valve are energized, the first two-position two-way valve is energized, and the first vacuum pump is started.

9. The method for indoor air quality monitoring according to claim 7, characterized in that: The corresponding component states in step 2 are: the second two-position two-way valve, the third two-position two-way valve, and the fourth two-position two-way valve are powered on, the second vacuum pump is started, and the manual flow meter is adjusted.

10. The method for indoor air quality monitoring according to claim 7, characterized in that: The corresponding component states in step 3 are: adjusting the manual flow meter and starting the second vacuum pump; energizing the first two-position three-way valve, the second two-position three-way valve, the third two-position three-way valve and the first two-position two-way valve respectively, and starting the first vacuum pump; energizing the second two-position two-way valve, the third two-position two-way valve, the fourth two-position two-way valve and the fourth two-position three-way valve respectively, and energizing the second vacuum pump.

Images