Ambient air monitoring equipment

Abstract

The utility model relates to the technical field of environment monitoring, and discloses environment air monitoring equipment which comprises a shell, a shell cover is installed at the opening position of the bottom of the shell, two through openings are formed in the shell cover, and fans are installed at the positions, corresponding to the two through openings, below the shell cover. A sensor array composed of a plurality of semiconductor type MEMS-CMOS gas sensors is installed on the inner top wall of the shell, an electric heating wire is installed at the position of a through opening in the top face of the shell cover, and a temperature and humidity sensor is installed at the upper position of the middle of the inner side wall of the shell. According to the monitoring equipment, the MEMS-CMOS gas sensor is used as a detection element of air components, the detection principle is that measurement is carried out based on the conductivity of a semiconductor, firstly, the measurement is not influenced by the smoke concentration in the air, and secondly, by additionally arranging the fan and the electric heating wire, the interior can be dehumidified when the humidity is relatively high, so that the sensor is maintained within a reliable working humidity range; and continuous, stable and reliable work of the sensor is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental monitoring, in particular to an environmental air monitoring device. Background Art

[0002] Ambient air monitoring is the sampling and measurement of pollutants in the air at fixed points, continuously or at regular intervals. Its main purpose is to determine whether the air quality meets the national air quality standards and to provide data for the preparation of air environment quality status evaluation reports. In addition, ambient air monitoring is also helpful in studying the changing laws and development trends of air quality and providing a basis for the prediction and forecasting of air pollution.

[0003] In terms of detection technology, traditional optical detection methods are mainstream, such as using ultraviolet fluorescence to detect sulfur dioxide, chemiluminescence to detect nitrogen oxides, and non-dispersive infrared absorption to detect carbon monoxide. In recent years, the DOAS method has emerged, which can detect multiple components at the same time and has higher efficiency. There are two main application methods of DOAS technology: direct measurement and complete extraction. The direct measurement method uses the flue as an open absorption pool to directly measure the gas in real time and continuously. It is easy to install and requires little maintenance, but it is prone to failure when the smoke or water mist is high. The complete extraction method places the optical platform in a protective box. The gas to be measured needs to be pre-treated before measuring the gas. The installation is more cumbersome, but the measurement optical path is not easily contaminated. In view of the drawbacks of the DOAS method, it is necessary to propose a monitoring method that is easy to install and maintain, and has stable and reliable operation. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides an ambient air monitoring device to solve the problems in the background technology.

[0006] (II) Technical solution

[0007] In order to solve the above problems, the utility model provides the following technical solutions:

[0008] An environmental air monitoring device comprises a shell, a shell cover is installed at an opening position at the bottom of the shell, two through holes are opened on the shell cover, fans are installed at positions corresponding to the two through holes below the shell cover, a sensor array composed of multiple semiconductor MEMS-CMOS gas sensors is installed on the top wall of the shell, a heating wire is installed at the through hole position on the top surface of the shell cover, and a temperature and humidity sensor is installed at the upper middle position of the inner wall of the shell.

[0009] Preferably, a collar is installed at the bottom of the shell, and a tooth groove is opened on the inner peripheral wall of the collar, and a tooth ring is fixed on the outer peripheral wall of the fan, and the tooth ring and the collar are meshed with each other. A sleeve is provided at the center position of the shell cover, and a gear 1 is installed on the outer wall of the sleeve, and the gear 1 is meshed with the tooth ring. Gear 2 is installed on the sleeve below gear 1, and gear 2 is meshed with gear 3. A motor is installed on gear 3 through pin key transmission.

[0010] Preferably, a bottom cover is installed at the bottom of the gear ring, a fixed shaft is installed on the bottom cover at a position corresponding to the center of the sleeve, the sleeve is sleeved on the fixed shaft to form a movable rotating sleeve connection, the motor and the bottom cover are fixed with screws, and the bottom cover has an opening at a position corresponding to the through port.

[0011] Preferably, a cam is installed on the outer wall of the bottom of the shell, and the ring is installed and fixed on the bottom surface of the cam.

[0012] Preferably, a protective net is installed at the opening position of the bottom cover.

[0013] Preferably, a cylindrical block is installed on the shell cover in the shell body at a position corresponding to the opening, and a plurality of uniform ventilation holes are opened on the cylindrical block.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the present invention provides an ambient air monitoring device having the following features:

[0016] Beneficial effects:

[0017] 1. This monitoring equipment uses MEMS-CMOS gas sensors as detection elements for air components. The detection principle is based on the conductivity of semiconductors. First, it is not affected by the smoke concentration in the air. Secondly, by adding fans and heating wires, the interior can be dehumidified when the humidity is high, so that the sensor is maintained within a reliable working humidity range, ensuring the continuous, stable and reliable operation of the sensor.

[0018] 2. The monitoring equipment, through the meshing transmission of multiple gears and gear rings, forms the effect of driving the overall rotation of the fan with the motor as the power, so as to adjust the position of the fan. According to whether the fan is in the port position and the blowing direction of the fan, various operation controls can be performed according to the actual situation to improve the adaptability to the on-site environment.

[0019] 3. The monitoring device can distribute the air entering and exiting the shell through the arrangement of cylindrical blocks and vents, so that the air can be diffused as much as possible in the shell when entering, ensuring that the sensor can be contacted and has enough time for detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a top view of the utility model;

[0021] Figure 2 It is a bottom view of the utility model;

[0022] Figure 3 It is a cross-sectional view of the utility model;

[0023] Figure 4 This is a schematic diagram of the fan arrangement in the utility model;

[0024] Figure 5 This is a diagram of the internal structure of the housing in the present utility model.

[0025] In the figure: 1. Shell; 2. Shell cover; 3. Through port; 4. Sensor array; 5. Fan; 6. Gear ring; 7. Cam; 8. Ring; 9. Tooth groove; 10. Sleeve; 11. Gear 1; 12. Gear 2; 13. Gear 3; 14. Motor; 15. Cylindrical block; 16. Vent hole; 17. Protective net; 18. Bottom cover; 19. Fixed shaft; 20. Temperature and humidity sensor; 21. Heating wire. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] See also Figure 1-5 , an environmental air monitoring device, comprising a shell 1, the shell 1 has an opening at the bottom, a shell cover 2 is installed at the opening position, two through openings 3 are formed on the shell cover 2, with the center of the shell cover 2 as the base point, the center angle of the two through openings 3 is 180°, a convex 7 is also integrally formed and installed on the outer wall of the bottom of the shell 1, a collar 8 is screwed on the bottom surface of the convex 7, and the inner wall of the collar 8 is provided with uniform tooth grooves 9, fans 5 are arranged at the positions corresponding to the two through openings 3 below the shell cover 2, and a fixed tooth ring 6 is sleeved on the outer wall of the fan 5, and the convex teeth on the outer periphery of the tooth ring 6 are meshed with the tooth grooves 9 on the inner periphery of the collar 8;

[0028] A sleeve 10 is provided at the center of the shell cover 2, and a gear 11 is integrally formed and installed on the outer wall of the sleeve 10 at a height position corresponding to the gear ring 6. The gear 11 and the gear ring 6 are meshed with each other. A gear 2 12 is also integrally formed and installed on the sleeve 10 below the gear 11. The diameter of the gear 2 12 is smaller than the diameter of the gear 1 11. The gear 2 12 is meshed with the gear 3 13. A motor 14 is installed on the gear 3 13 through a pin key matching transmission.

[0029] The bottom of the gear ring 6 is screwed with a bottom cover 18, and a fixed shaft 19 is welded and installed on the bottom cover 18 at a position corresponding to the center of the sleeve 10. The sleeve 10 is sleeved on the fixed shaft 19 to form a movable rotating sleeve connection and fixation. The motor 14 and the bottom cover 18 are screwed and fixed. The position corresponding to the through port 3 on the bottom cover 18 is also opened, and a protective net 17 is screwed and installed at the opening position;

[0030] A sensor array 4 is glued and mounted on the top wall of the housing 1. The sensor array 4 is composed of a plurality of semiconductor MEMS-CMOS gas sensors. In this embodiment, the gas sensor is used for detecting gases in the ambient air, so only types related to ambient air gas detection are set, including but not limited to detecting oxygen, carbon dioxide, sulfur dioxide, carbon monoxide, ozone and nitrogen oxides;

[0031] A temperature and humidity sensor 20 is also glued and installed in the middle upper position of the inner wall of the shell 1, and a cylindrical block 15 is glued and installed on the shell cover 2 in the shell 1 at the position corresponding to the opening 3. The cylindrical block 15 is provided with a plurality of uniform ventilation holes 16. The distance between the cylindrical block 15 and the sensor array 4 is not less than two centimeters. The middle position of one side of the cylindrical block 15 connected to the shell cover 2 is concave, and a heating wire 21 is glued and installed on the top surface of the shell cover 2 at the concave position. The sensor array 4, the temperature and humidity sensor 20, the motor 14, the fan 5 and the heating wire 21 are all externally wired. The wire interfaces of the motor 14, the heating wire 21 and the fan 5 are ATX interfaces, and the wire interfaces of the sensor array 4 and the temperature and humidity sensor 20 are I2C digital interfaces.

[0032] Before use, install it from the top surface of the shell 1, keep the opening downward, reduce dust or other foreign matter from entering the interior, and at the same time, the protective net 17 is used to prevent some insects from entering the interior. When the ambient air enters naturally through the opening 3 or is forced to be sucked into the shell 1 by the fan 5, the incoming air is first distributed through the vents 16 in the corresponding cylindrical block 15, and then diffused into the shell 1. The vents 16 are used to disperse the incoming air, and also to disperse and circulate the air to avoid being only beneficial to the detection of the sensor at the position of the opening 3, but not conducive to the detection of sensors at other positions. The temperature and humidity Chuang Angel 20 is used to monitor the temperature and humidity conditions in the shell 1. When the temperature and humidity are high and not conducive to the operation of the sensor, the fan 5 can be turned on for forced ventilation and heat dissipation;

[0033] There are three ventilation modes when in use. One is natural ventilation. At this time, the motor 14 is controlled to work, and the sleeve 10 is driven to rotate by the meshing transmission of the gear three 13 and the gear two 12, and then the gear one 11 is meshed with the gear ring 6, and under the fixed restriction of the collar 8, the gear ring 6 and the fan 5 are driven to rotate with the fixed shaft 19 as the center of the circle, and rotate 90° to make the fan 5 leave the position of the passage 3. At this time, the air flows into the housing 1 by relying on the environment, and naturally contacts the sensor array 4, and then the sensor array 4 detects and monitors multiple components in the air;

[0034] The second type is forced circulation ventilation. In this case, the motor 14 is controlled to move the fan 5 to the position of the opening 3. The two fans 5 are turned on, one blows air into the housing 1, and the other blows air out of the housing 1, forming forced ventilation in the housing 1, increasing the amount of ambient air entering the housing 1, and is suitable for use in the case where the ambient air circulation is slow or there is no wind.

[0035] The third type is short-term forced air supply, in which case the fan 5 remains at the position of the opening 3, and the two fans 5 are turned on at the same time to supply air into the housing 1, so that a large amount of ambient air enters the housing 1 instantly, which is suitable for detection when the gas content is low.

Claims

1. An ambient air monitoring device, comprising a housing (1), characterized in that: A shell cover (2) is installed at the bottom opening of the shell (1), two openings (3) are opened on the shell cover (2), fans (5) are installed at positions corresponding to the two openings (3) below the shell cover (2), a sensor array (4) composed of a plurality of semiconductor-type MEMS-CMOS gas sensors is installed on the top wall of the shell (1), a heating wire (21) is installed at the opening (3) on the top surface of the shell cover (2), and a temperature and humidity sensor (20) is installed at the upper middle position of the inner side wall of the shell (1).

2. An ambient air monitoring device according to claim 1, characterized in that: The bottom of the housing (1) is provided with a sleeve (8), the inner peripheral wall of the sleeve (8) is provided with a tooth groove (9), the outer peripheral wall of the fan (5) is fixed with a tooth ring (6), the tooth ring (6) and the sleeve (8) are meshed with each other, a sleeve (10) is provided at the center position on the housing cover (2), a gear one (11) is provided on the outer wall of the sleeve (10), the gear one (11) and the gear ring (6) are meshed with each other, a gear two (12) is provided on the sleeve (10) below the gear one (11), the gear two (12) and the gear three (13) are meshed with each other, and a motor (14) is provided on the gear three (13) through a pin key matching transmission.

3. An ambient air monitoring device according to claim 2, characterized in that: A bottom cover (18) is installed at the bottom of the gear ring (6), a fixed shaft (19) is installed on the bottom cover (18) at a position corresponding to the center of the sleeve (10), the sleeve (10) is sleeved on the fixed shaft (19) to form a movable rotating sleeve connection, the motor (14) and the bottom cover (18) are fixed by screws, and the bottom cover (18) is opened at a position corresponding to the through port (3).

4. The ambient air monitoring device according to claim 3, characterized in that: A convex purlin (7) is installed on the outer wall of the bottom of the shell (1), and a collar (8) is installed and fixed on the bottom surface of the convex purlin (7).

5. The ambient air monitoring device according to claim 3, characterized in that: A protective net (17) is installed at the opening position of the bottom cover (18).

6. The ambient air monitoring device according to claim 1, characterized in that: A cylindrical block (15) is installed on the shell cover (2) in the shell (1) at a position corresponding to the opening (3), and a plurality of evenly spaced vent holes (16) are provided on the cylindrical block (15).

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