Air quality detection system

Abstract

The utility model provides an air quality detection system, and relates to the field of gas detection. The observation gas chamber is communicated with a gas source to be detected, and a plurality of sensor groups are arranged in the observation gas chamber; the calibration unit is connected between the to-be-detected gas source and the observation gas chamber; wherein the calibration unit comprises a zero point calibration module and a range calibration module, the zero point calibration module comprises a first two-position three-way valve, a dehumidification barrel and a filter barrel which are communicated in sequence, a gas source to be detected is communicated with the dehumidification barrel and the observation gas chamber through the first two-position three-way valve, and the output end of the filter barrel is communicated with the observation gas chamber; the range calibration module comprises a second two-position three-way valve and a plurality of standard gas cylinders, and the zero point calibration module is communicated with the range calibration module and the observation gas chamber through the second two-position three-way valve; and a plurality of electromagnetic valves and a multi-way connector are arranged at the communication part of the standard gas bottle. Zero point and measuring range calibration can be achieved during gas detection, and the accuracy of detection data is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas detection, concretely relates to an air quality detection system. BACKGROUND

[0002] Atmosphere observation refers to observing, analyzing and determining the influence of the concentration of gas components in the atmospheric environment on the environment and meteorological prediction evaluation, which can reflect the atmospheric environment of the region at any time. Good maintenance of the atmosphere observation instrument helps to continuously monitor the atmosphere, and the gas sensor in the observation instrument mostly uses an electrochemical method, and the chemical properties will change after long-term use, thereby affecting the observation value, so the sensor needs to be calibrated and maintained regularly when leaving the factory and after use, which plays an important role in ensuring the accuracy of observation data.

[0003] The existing gas detection system does not have a zero point and range calibration function, and most of the existing calibration methods need maintenance personnel to calibrate on site, which not only complicates the calibration process, but also cannot guarantee the accuracy of the data when used on site.

[0004] Therefore, the utility model provides an air quality detection system. UTILITY MODEL CONTENT

[0005] In view of the deficiencies of the prior art, the utility model provides an air quality detection system, which can calibrate the zero point and range during gas detection, and improve the accuracy of detection data.

[0006] The technical scheme of the utility model is as follows:

[0007] The measured gas source; the observation gas chamber is communicated with the measured gas source, and a plurality of sensor groups are arranged in the observation gas chamber; the calibration unit is connected between the measured gas source and the observation gas chamber; wherein the calibration unit comprises a zero point calibration module and a range calibration module, the zero point calibration module comprises a first two-position three-way valve, a dehumidification barrel and a filter barrel which are communicated in sequence, the measured gas source is communicated with the dehumidification barrel and the observation gas chamber through the first two-position three-way valve, and the output end of the filter barrel is communicated with the observation gas chamber; the range calibration module comprises a second two-position three-way valve and a plurality of standard gas bottles, the zero point calibration module is communicated with the range calibration module and the observation gas chamber through the second two-position three-way valve; a plurality of electromagnetic valves and a multi-way joint are arranged at the communication position of the standard gas bottle.

[0008] Preferably, the input port of the multi-way joint is communicated with a plurality of standard gas bottles through a plurality of corresponding electromagnetic valves, and a flow limiting hole for limiting the flow of standard gas is arranged at the output port of the multi-way joint.

[0009] Preferably, the dehumidification barrel is provided with a water absorption filter membrane and a temperature sensor, and a heating pipe is wound outside the dehumidification barrel.

[0010] Preferably, the filter barrel is filled with filter material for filtering the gas source to be measured.

[0011] Preferably, a third two-position three-way valve is further included, which comprises a first input end, a second input end and a first output end, the first input end is in communication with the output end of the second two-position three-way valve, the second input end is in communication with the output end of the first two-position three-way valve, and the first output end is in communication with the observation gas chamber.

[0012] Preferably, the output end of the observation gas chamber is provided with a vacuum diaphragm air pump and is in communication with the exhaust port through the vacuum diaphragm air pump.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] When the detection is not needed, the gas source to be measured directly enters the observation gas chamber for normal data collection, when the zero point calibration is needed, the controller is opened to make the gas source to be measured pass through the dehumidification barrel and the filter barrel and then enter the observation gas chamber, and the dehumidification and the filtering operation filter the gas source to be measured into zero gas and input into the observation gas chamber, and each sensor in the observation gas chamber collects and serves as the zero point calibration value of each observation data; when the range calibration is needed, the valve of the required standard gas bottle is opened through the control solenoid valve, and the second two-position three-way valve is opened, the standard gas is stably set at the set value when entering the observation gas chamber due to the action of the flow limiting hole assembly, and each sensor in the observation gas chamber collects and serves as the range calibration value of the observation parameter, the zero point and the range can be calibrated during the gas detection, the accuracy of the detection data is improved, and the zero point and the range can be calibrated during the gas detection, the accuracy of the detection data is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without the creative labor for those skilled in the art.

[0016] Figure 1 It is a structural schematic view of the air quality detection system of the utility model;

[0017] The accompanying drawings: 1- source of gas to be measured; 2- observation gas chamber; 3- calibration unit; 31- zero point calibration module; 311- first two-position three-way valve; 312- dehumidification barrel; 313- filter barrel; 314- heating pipe; 32- range calibration module; 321- second two-position three-way valve; 322- standard gas cylinder; 323- electromagnetic valve; 324- flow limiting hole; 325- multi-way connector; 33- third two-position three-way valve. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", "fourth", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] The present embodiment proposes an air quality detection system, as shown in Figure 1 The source of gas to be measured 1;

[0022] The observation gas chamber 2 is in communication with the source of gas to be measured 1, and a plurality of sensor groups are arranged in the observation gas chamber 2.

[0023] The calibration unit 3 is connected between the source of gas to be measured 1 and the observation gas chamber 2.

[0024] The calibration unit 3 comprises a zero point calibration module 31 and a range calibration module 32, the zero point calibration module 31 comprises a first two-position three-way valve 311, a dehumidification barrel 312 and a filter barrel 313 connected in sequence, the to-be-measured gas source 1 is communicated with the dehumidification barrel 312 and the observation gas chamber 2 through the first two-position three-way valve 311, and the output end of the filter barrel 313 is communicated with the observation gas chamber 2.

[0025] The range calibration module 32 comprises a second two-position three-way valve 321 and a plurality of standard gas bottles 322, the zero point calibration module 31 is communicated with the range calibration module 32 and the observation gas chamber 2 through the second two-position three-way valve 321, and a plurality of electromagnetic valves 323 and a multi-way joint 325 are arranged at the communication position of the standard gas bottles 322.

[0026] Working principle: when the to-be-measured gas source 1 directly enters the observation gas chamber 2 for normal data collection, when zero point calibration is needed, the first two-position three-way valve 311 is opened to make the to-be-measured gas source 1 pass through the dehumidification barrel and the filter barrel 313 and then enter the observation gas chamber 2, and the dehumidification and filtration operations filter the to-be-measured gas source 1 into zero gas and enter the observation gas chamber 2, and the sensors in the observation gas chamber 2 collect data as zero point calibration values of the observation data; when range calibration is needed, the valve of the required standard gas bottle 322 is opened, the second two-position three-way valve 321 is opened, the standard gas enters the observation gas chamber 2 and the flow of the standard gas is stabilized at a set value due to the action of the flow limiting hole assembly, and the sensors in the observation gas chamber 2 collect data as range calibration values of the observation parameters, the zero point and range calibration can be realized during gas detection, the accuracy of the detection data is improved, and the zero point and range calibration can be realized during gas detection, the accuracy of the detection data is improved.

[0027] In the embodiment, the input port of the multi-way joint 325 is communicated with a plurality of standard gas bottles 322 through a plurality of corresponding electromagnetic valves 323, and the output port of the multi-way joint 325 is provided with a flow limiting hole 324 for limiting the flow of the standard gas.

[0028] In the embodiment, different gas sources use different standard gases, so that the standard gas bottles are arranged to be selectable, one standard gas bottle corresponds to the control of one electromagnetic valve, and the classification operation is facilitated.

[0029] In the embodiment, the dehumidification barrel 312 is provided with a water absorption filter membrane and a temperature sensor, and a heating pipe 314 is wound outside the dehumidification barrel 312, so that the dehumidification barrel can be heated through the feedback of the temperature sensor, and the to-be-measured gas source is kept at a constant temperature in the dehumidification barrel 312.

[0030] In the embodiment, the filter barrel 313 is filled with filter material for filtering the to-be-measured gas source.

[0031] In the embodiment, a third two-position three-way valve 33 is further included, which comprises a first input end, a second input end and a first output end, the first input end is communicated with the output end of the second two-position three-way valve 321, the second input end is communicated with the output end of the first two-position three-way valve 311, and the first output end is communicated with the observation gas chamber 2; the third two-position three-way valve 33 can be used to make the calibration unit 3 independent of the to-be-tested gas source and the observation gas chamber, and when needed, the zero point calibration or the range calibration can be started alone by cooperation of the third two-position three-way valve 33.

[0032] In the embodiment, the first two-position three-way valve 311, the second two-position three-way valve 321 and the third two-position three-way valve 33, the heating pipe 314 and the electromagnetic valve communicated with the standard gas bottle 322 are electrically connected with the controller, the actual detection can be remotely controlled, the controller is used for controlling whether the corresponding valve is selected to detect or whether the zero point detection or the range detection is performed, the labor maintenance cost is reduced, and the convenience is improved.

[0033] In the embodiment, the output end of the observation gas chamber 2 is provided with a vacuum diaphragm air pump and is communicated with an exhaust port through the vacuum diaphragm air pump.

[0034] In the embodiment, as shown in Figure 1 The observation gas chamber 2 is three, which are sequentially connected in series; by the sequential connection in series, different observation gas chambers are used to test different parameters by using different sensors, and a flow limiting component is arranged at the communication position of adjacent observation gas chambers 2, so that the gas flow of each observation gas chamber is stably set at a set value during calibration.

[0035] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An air quality detection system, characterized in that: include: The gas source to be tested (1); An observation chamber (2) is connected to the gas source (1) to be measured, and a number of sensor groups are provided in the observation chamber (2); A calibration unit (3) is connected between the gas source to be tested (1) and the observation chamber (2); The calibration unit (3) includes a zero-point calibration module (31) and a range calibration module (32). The zero-point calibration module (31) includes a first two-position three-way valve (311), a dehumidification tank (312), and a filter tank (313) connected in sequence. The gas source (1) to be tested is connected to the dehumidification tank (312) and the observation chamber (2) through the first two-position three-way valve (311). The output end of the filter tank (313) is connected to the observation chamber (2). The range calibration module (32) includes a second two-position three-way valve (321) and several standard gas cylinders (322). The zero point calibration module (31) is connected to the range calibration module (32) and the observation gas chamber (2) respectively through the second two-position three-way valve (321). Several solenoid valves (323) and multi-port connectors (325) are provided at the connection points of the standard gas cylinders (322).

2. The air quality detection system according to claim 1, characterized in that: The inlet of the multi-port connector (325) is connected to several standard gas cylinders (322) through several corresponding solenoid valves (323), and the outlet of the multi-port connector (325) is provided with a flow-limiting orifice (324) for limiting the flow rate of standard gas.

3. The air quality detection system according to claim 1, characterized in that: The dehumidification barrel (312) is equipped with a water-absorbing filter membrane and a temperature sensor, and a heating tube (314) is wrapped around the outside of the dehumidification barrel (312).

4. The air quality detection system according to claim 1, characterized in that: The filter barrel (313) is filled with filter media for filtering the gas source to be tested.

5. An air quality detection system according to claim 1, characterized in that: It also includes a third two-position three-way valve (33), which includes a first input end, a second input end and a first output end. The first input end is connected to the output end of the second two-position three-way valve (321), the second input end is connected to the output end of the first two-position three-way valve (311), and the first output end is connected to the observation chamber (2).

6. An air quality detection system according to claim 1, characterized in that: The output end of the observation chamber (2) is equipped with a vacuum diaphragm pump and is connected to the exhaust port through the vacuum diaphragm pump.

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