Automatic calibration particulate matter PM2.5 monitoring equipment

Abstract

The utility model relates to particulate matter PM2.5 monitoring equipment with an automatic calibration function, belongs to the technical field of particulate matter monitoring, and solves the problem of inaccurate detection results in the prior art. The monitoring equipment comprises an air inlet and an air outlet; the at least two monitoring pipelines are connected in parallel, each monitoring pipeline is provided with a concentration detection device and an air pump, an inlet of the monitoring pipeline is connected with the air inlet, and an outlet of the monitoring pipeline is connected with the air outlet; the cleaning pipeline is provided with an impurity cleaning device, an inlet of the impurity cleaning device is connected with an outlet of the monitoring pipeline, and an outlet of the impurity cleaning device is connected with an inlet of the monitoring pipeline; the calibration pipeline is provided with a calibration gas cylinder, an inlet of the calibration gas cylinder is connected with an outlet of the monitoring pipeline, and an outlet of the calibration gas cylinder is connected with an inlet of the monitoring pipeline. According to the utility model, the deviation of the concentration detection result of particulate matters PM2.5 is eliminated in time.

Description

Technical Field

[0001] The utility model belongs to the technical field of particulate matter monitoring, and in particular relates to an automatically calibrated particulate matter PM2.5 monitoring device. Background Art

[0002] In the public place health inspection, the detection of particulate matter is a very important part. Particulate matter refers to tiny solid or liquid particles suspended in the air, which are usually less than 10 microns in diameter; these particulate matter may come from various sources, including combustion, industrial emissions, vehicle exhaust, etc.; the impact of particulate matter on human health is huge; long-term inhalation of air containing PM2.5 (particulate matter with a diameter less than or equal to 2.5 microns) may cause or aggravate respiratory diseases such as asthma and chronic obstructive pulmonary disease; in addition, some smaller particulate matter, such as PM1.0 and PM0.5, can even directly enter the deep lungs, posing a greater threat to human health; particulate matter also has a great impact on the environment; they can reduce air visibility and affect traffic safety; they can also adsorb and spread harmful substances, such as heavy metals, organic pollutants, etc., further aggravating environmental pollution; in addition, particulate matter may also affect the service life of buildings; for example, particulate matter can accelerate aging and damage by eroding the surface materials of buildings.

[0003] The monitoring equipment in the prior art usually outputs the results directly after detecting the concentration of particulate matter PM2.5. However, due to the large amount of impurities in the air, the detection device may be contaminated, causing zero point drift and other phenomena, which in turn leads to technical problems such as inaccurate detection results. Utility Model Content

[0004] In view of the above analysis, an embodiment of the present utility model aims to provide an automatically calibrated particulate matter PM2.5 monitoring device to solve one or more of the above problems existing in the prior art.

[0005] The purpose of the utility model is achieved in this way:

[0006] An automatically calibrated PM2.5 monitoring device comprising:

[0007] Air inlet and outlet;

[0008] At least two monitoring pipelines connected in parallel, each of which is provided with a concentration detection device and an air pump, the inlet of the monitoring pipeline is connected to the air inlet, and the outlet of the monitoring pipeline is connected to the air outlet;

[0009] The cleaning pipeline is provided with an impurity cleaning device, the inlet of the impurity cleaning device is connected to the outlet of the monitoring pipeline, and the outlet of the impurity cleaning device is connected to the inlet of the monitoring pipeline;

[0010] The calibration pipeline is provided with a calibration gas cylinder, the inlet of the calibration gas cylinder is connected to the outlet of the monitoring pipeline, and the outlet of the calibration gas cylinder is connected to the inlet of the monitoring pipeline.

[0011] Furthermore, solenoid valves are provided at the connection points of the air inlet, the outlet of the impurity cleaning device, the outlet of the calibration gas cylinder and the inlet of the monitoring pipeline; a three-way solenoid valve is provided at the connection points of the inlet of the calibration gas cylinder, the inlet of the impurity cleaning device and the outlet of the monitoring pipeline; a three-way solenoid valve is also provided at the connection points of the outlet of the monitoring pipeline, the inlet of the impurity cleaning device and the air outlet; a one-way valve is provided at the inlet of the calibration gas cylinder.

[0012] Furthermore, it also includes a communication component, including a data processing module, which is used to convert the electrical signal output by the concentration detection device into a digital signal.

[0013] Furthermore, the communication component also includes a data transmission module for transmitting the digital signal.

[0014] Furthermore, it also includes a control component, including a decision module, which is configured to generate a control strategy according to the digital signal transmitted by the data transmission module.

[0015] Furthermore, the control component also includes a control module configured to control the operation of each component in the monitoring pipeline, the cleaning pipeline and the calibration pipeline according to the control strategy.

[0016] Furthermore, it also includes a box body with a working chamber for installing the concentration detection device, the air pump, the communication component and the control component.

[0017] Furthermore, the box body also has a maintenance compartment for installing the impurity cleaning device and the calibration gas cylinder.

[0018] Furthermore, the monitoring pipeline also includes a filtering device, a flow meter and a dehumidification device, the flow meter and the dehumidification device are arranged in the working compartment, and the filtering device is arranged in the maintenance compartment.

[0019] Furthermore, it also includes a power supply component, which is arranged in the working chamber and is used to provide power to the particulate matter PM2.5 monitoring equipment.

[0020] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0021] The automatic calibration particulate matter PM2.5 monitoring device provided by the utility model processes the air after preliminary detection through a cleaning component and a calibration component, and then performs a secondary detection, thereby improving the accuracy of the particulate matter PM2.5 concentration detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 A schematic diagram of the structure of the automatic calibration particulate matter PM2.5 monitoring device provided by the utility model;

[0024] Figure 2 A front view of the automatic calibration PM2.5 monitoring device provided by the utility model;

[0025] Figure 3 A bottom view of the automatic calibration particulate matter PM2.5 monitoring device provided by the utility model;

[0026] Figure 4 A simple working diagram of the automatically calibrated particulate matter PM2.5 monitoring device provided by the utility model.

[0027] Reference numerals:

[0028] 1-air inlet; 2-air outlet; 3-monitoring pipeline; 301-concentration detection device; 302-air pump; 303-solenoid valve; 304-three-way solenoid valve; 305-filter device; 306-flow meter; 307-dehumidification device; 4-cleaning pipeline; 401-impurity cleaning device; 5-calibration pipeline; 501-calibration gas cylinder; 6-communication component; 601-data processing module; 602-data transmission module; 7-control component; 8-box; 801-working compartment; 802-maintenance compartment; 803-folding handle; 804-GPS positioning antenna; 805-vent; 806-button; 9-power supply component. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments disclosed in this disclosure can be combined, separated, interchanged and / or rearranged with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0030] In the accompanying drawings, the size and relative size of components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments may be implemented differently, a specific process sequence may be performed in a different order than described. For example, two successively described processes may be performed substantially simultaneously or in an order opposite to the order described. In addition, the same reference numerals represent the same components.

[0031] Example 1

[0032] A specific embodiment of the utility model is as follows Figure 1-4 As shown, an automatically calibrated PM2.5 monitoring device is disclosed, comprising:

[0033] Air inlet 1 and air outlet 2;

[0034] At least two monitoring pipelines 3 connected in parallel, each of which is provided with a concentration detection device 301 and an air pump 302, the inlet of the monitoring pipeline 3 is connected to the air inlet 1, and the outlet of the monitoring pipeline 3 is connected to the air outlet 2;

[0035] The cleaning pipeline 4 is provided with an impurity cleaning device 401, the inlet of the impurity cleaning device 401 is connected to the outlet of the monitoring pipeline 1, and the outlet of the impurity cleaning device 401 is connected to the inlet of the monitoring pipeline 1;

[0036] The calibration pipeline 5 is provided with a calibration gas cylinder 501 , the inlet of the calibration gas cylinder 501 is connected to the outlet of the monitoring pipeline 1 , and the outlet of the calibration gas cylinder 501 is connected to the inlet of the monitoring pipeline 1 .

[0037] During implementation, the monitoring equipment is started, and the air pump 302 starts working to draw air from the environment into each monitoring pipeline. The concentration of particulate matter PM2.5 is detected by the concentration detection device 301, and an electrical signal is generated. The background compares the deviation of multiple detection results. If the deviation is small, the detected air in the monitoring pipeline 3 is discharged through the outlet 2. If the deviation is large, the detected air in the monitoring pipeline is sent to the cleaning pipeline 4 or the calibration pipeline 5, and is processed by the impurity cleaning device 401 or the calibration gas cylinder 501 to improve the accuracy of the detection result.

[0038] Exemplarily, the working principle of the monitoring pipeline 3 is as follows:

[0039] The deviations between the detection results of the various concentration detection devices 301 in the monitoring pipeline 3 are calculated, and are divided into the following three cases:

[0040] (I) If the deviation is less than the first threshold value, it means that the deviation of the detection result can be ignored, and the detected air in the monitoring pipeline 3 is discharged from the monitoring device through the air outlet 2;

[0041] (II) If the deviation is greater than the first threshold value and less than the second threshold value, it means that the deviation of the detection result is large, which may be due to the large amount of impurities in the air causing contamination to the concentration detection device 301. In this case, it is necessary to perform a secondary test after cleaning and filtration by the impurity cleaning device 401 until the difference is less than 5%, and then the air is discharged from the monitoring device;

[0042] (III) If the difference is greater than the second threshold, it indicates that the deviation of the detection result is large, which may be due to the zero drift phenomenon of the concentration detection device 301. At this time, the concentration detection device 301 needs to be calibrated by the calibration gas cylinder 501. The calibration gas cylinder 501 contains a gas of a fixed concentration, which is sent into the concentration detection device 301 to eliminate the zero drift phenomenon.

[0043] Compared with the prior art, the automatically calibrated particulate matter PM2.5 monitoring equipment provided in this embodiment achieves timely elimination of deviations in particulate matter PM2.5 concentration detection results through the coordinated work of the monitoring pipeline, the cleaning pipeline and the calibration pipeline.

[0044] Preferably, the impurity cleaning device 401 includes a precision filter capable of filtering small-size impurities to filter out impurities in the air that affect the accuracy of the particulate matter PM2.5 detection results, thereby achieving a cleaning effect and eliminating deviations in the detection results.

[0045] In this embodiment, a solenoid valve 303 is provided at the connection between the air inlet 1, the outlet of the impurity cleaning device 401, the outlet of the calibration gas cylinder 501 and the inlet of the monitoring pipeline 1; a three-way solenoid valve 304 is provided at the connection between the inlet of the calibration gas cylinder 501, the inlet of the impurity cleaning device 401 and the outlet of the monitoring pipeline 1; a three-way solenoid valve 304 is also provided at the connection between the outlet of the monitoring pipeline 1, the inlet of the impurity cleaning device 401 and the air outlet 2; and a one-way valve is provided at the inlet of the calibration gas cylinder 501.

[0046] Specifically, the flow of air in the monitoring pipeline 3 , the cleaning pipeline 4 and the calibration pipeline 5 is controlled by controlling the on and off of the solenoid valve 303 , the three-way solenoid valve 304 and the one-way valve.

[0047] In this embodiment, a communication component 6 is further included, including a data processing module 601 for converting the electrical signal output by the concentration detection device 301 into a digital signal.

[0048] Exemplarily, the concentration detection device 301 includes a laser transmitter and a photosensitive receiver. The air in the environment enters the concentration detection device 301, and the laser transmitter emits a laser that passes through the air and is captured by the photosensitive receiver, which converts the light signal into an electrical signal representing the concentration of particulate matter PM2.5. After receiving the electrical signal, the data processing module 601 converts it into a digital signal and stores it for the next transmission or processing.

[0049] In this embodiment, the communication component 6 further includes a data transmission module 602 for transmitting the digital signal.

[0050] Specifically, the data transmission module 602 can utilize various communication protocols and technologies, such as Bluetooth, Wi-Fi or mobile networks, to transmit the digital signal to other components, other devices or cloud servers to achieve real-time or delayed transmission to meet the needs of different application scenarios.

[0051] In this embodiment, a control component 7 is further included, including a decision module configured to generate a control strategy according to the digital signal transmitted by the data transmission module 602.

[0052] Specifically, the decision module in the control component 7 receives the digital signal transmitted by the data transmission module 602, and then calculates the difference between the digital signals representing the PM2.5 concentrations detected by different concentration detection devices 301, and generates a corresponding control strategy according to the working mode of the monitoring device corresponding to the different differences.

[0053] In this embodiment, the control component 7 further includes a control module, which is configured to control the operation of each component in the monitoring pipeline 3, the cleaning pipeline 4 and the calibration pipeline 5 according to the control strategy.

[0054] Specifically, the control module sends control instructions to the concentration detection device 301, the air pump 302, the impurity cleaning device 401, the calibration gas cylinder 501, the solenoid valve 303, and the three-way solenoid valve 304 according to the control strategy, so as to set the monitoring equipment to the working mode corresponding to the control strategy.

[0055] In this embodiment, a box body 8 is also included, which has a working chamber 801 for installing the concentration detection device 301, the air pump 302, the communication component 6 and the control component 7.

[0056] Specifically, the working chamber 801 is used to install devices or components that do not need to be replaced regularly, such as the concentration detection device 301, the air pump 302, the communication component 6 and the control component 7. The door of the working chamber 801 is made of galvanized carbon steel plate with spray-coated outer surface, and a sealing strip is provided between the door and the working chamber 801 to prevent impurities from entering.

[0057] Exemplarily, the box body 8 is made of galvanized carbon steel plate with plastic sprayed on the outer surface, which improves the corrosion resistance of the equipment, protects the material from corrosion, and also improves the aesthetics of the equipment. A folding handle 803 is also installed on the side wall of the box body 8 to facilitate the transportation of the equipment.

[0058] In this embodiment, the box body 8 further has a maintenance compartment 802 for installing the impurity cleaning device 401 and the calibration gas cylinder 501 .

[0059] Specifically, a partition is provided between the working chamber 801 and the maintenance chamber 802, and a hole for the air supply pipe is provided on the partition to connect the device in the maintenance chamber 802 with the device in the working chamber 801; the maintenance chamber 802 is used to install the impurity cleaning device 401 and the calibration gas cylinder 501 and other devices or components that require regular maintenance or replacement, and the door of the maintenance chamber 802 is made of galvanized carbon steel plate with plastic spraying on the outer surface, which improves the corrosion resistance of the equipment.

[0060] In this embodiment, the monitoring pipeline 3 further includes a filter device 305 , a flow meter 306 and a dehumidification device 307 . The flow meter 306 and the dehumidification device 307 are arranged in the working chamber 801 , and the filter device 305 is arranged in the maintenance chamber 802 .

[0061] Specifically, the flow meter 306 is used to calculate the flow rate of the air detected by the concentration detection device 301, and upload the calculation result to the control component 7, so that the control component 7 can control the start or shut down of the monitoring device.

[0062] In this embodiment, a power supply component 9 is also included, which is arranged in the working chamber 801 and is used to provide power for the particulate matter PM2.5 monitoring equipment.

[0063] Specifically, the power supply component 9 is used to convert the external 220V voltage into the 12V working voltage of the monitoring device.

[0064] In this embodiment, the monitoring component 3 further includes a dehumidification module 307, which is disposed in the working chamber 801 and is respectively connected to the air inlet 1 and the concentration detection device 301.

[0065] Exemplarily, the dehumidification module 307 includes an electric heating device such as a resistance wire and a heating plate to remove moisture from the air entering the monitoring device through the air inlet 1, thereby preventing corrosion of devices or components in the monitoring device.

[0066] In this embodiment, a GPS positioning antenna 804, a vent 805 and a button 806 are also provided on the side wall of the box body 8, which are respectively used to provide the location information of the monitoring device, make the temperature inside and outside the monitoring device consistent, and manually control the opening or closing of the monitoring device; a filter is provided on the inside of the vent 805 to prevent external impurities from entering the monitoring device.

[0067] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An automatically calibrated PM2.5 monitoring device, characterized in that: include: An air inlet (1) and an air outlet (2); At least two monitoring pipelines (3) connected in parallel, each of the monitoring pipelines (3) being provided with a concentration detection device (301) and an air pump (302), the inlet of the monitoring pipeline (3) being connected to the air inlet (1), and the outlet of the monitoring pipeline (3) being connected to the air outlet (2); The cleaning pipeline (4) is provided with an impurity cleaning device (401), the inlet of the impurity cleaning device (401) is connected to the outlet of the monitoring pipeline (3), and the outlet of the impurity cleaning device (401) is connected to the inlet of the monitoring pipeline (3); The calibration pipeline (5) is provided with a calibration gas cylinder (501), the inlet of the calibration gas cylinder (501) is connected to the outlet of the monitoring pipeline (3), and the outlet of the calibration gas cylinder (501) is connected to the inlet of the monitoring pipeline (3).

2. The automatic calibration PM2.5 monitoring device according to claim 1, characterized in that: A solenoid valve (303) is provided at the connection between the air inlet (1), the outlet of the impurity cleaning device (401), the outlet of the calibration gas cylinder (501) and the inlet of the monitoring pipeline (3); a three-way solenoid valve (304) is provided at the connection between the inlet of the calibration gas cylinder (501), the inlet of the impurity cleaning device (401) and the outlet of the monitoring pipeline (3); a three-way solenoid valve (304) is also provided at the connection between the outlet of the monitoring pipeline (3), the inlet of the impurity cleaning device (401) and the air outlet (2); and a one-way valve is provided at the inlet of the calibration gas cylinder (501).

3. The automatic calibration PM2.5 monitoring device according to claim 2, characterized in that: It also includes a communication component (6), including a data processing module (601) for converting the electrical signal output by the concentration detection device (301) into a digital signal.

4. The automatic calibration PM2.5 monitoring device according to claim 3, characterized in that: The communication component (6) also includes a data transmission module (602) for transmitting the digital signal.

5. The automatic calibration PM2.5 monitoring device according to claim 4, characterized in that: It also includes a control component (7), including a decision module, configured to generate a control strategy according to the digital signal transmitted by the data transmission module (602).

6. The automatic calibration PM2.5 monitoring device according to claim 5, characterized in that: The control component (7) further comprises a control module configured to control the operation of each component in the monitoring pipeline (3), the cleaning pipeline (4) and the calibration pipeline (5) according to the control strategy.

7. The automatic calibration PM2.5 monitoring device according to claim 5, characterized in that: It also comprises a box body (8) having a working chamber (801) for installing the concentration detection device (301), the air pump (302), the communication component (6) and the control component (7).

8. The automatic calibration PM2.5 monitoring device according to claim 7, characterized in that: The box body (8) also has a maintenance compartment (802) for installing the impurity cleaning device (401) and the calibration gas cylinder (501).

9. The automatic calibration PM2.5 monitoring device according to claim 8, characterized in that: The monitoring pipeline (3) further comprises a filtering device (305), a flow meter (306) and a dehumidifying device (307); the flow meter (306) and the dehumidifying device (307) are arranged in the working chamber (801), and the filtering device (305) is arranged in the maintenance chamber (802).

10. The automatic calibration PM2.5 monitoring device according to claim 8, characterized in that: It also includes a power supply component (9), which is arranged in the working chamber (801) and is used to provide power to the particulate matter PM2.5 monitoring equipment.

Images