A kind of atmospheric particulate monitoring device based on taxi roof light

Abstract

The utility model discloses a kind of atmospheric particulate matter monitoring devices based on taxi roof light, including heat recovery unit, sampling head, exhaust head, sampling pipe, lamp box backplate and lamp box bottom plate, the lamp box backplate is arranged at the side of lamp box bottom plate, sampling head and exhaust head are respectively arranged at the both ends of sampling pipe, program-controlled heater, refrigeration unit, particulate matter sensor and air pump are sequentially connected along gas guide direction and are arranged on sampling pipe, filter unit is arranged at the bottom of sampling head, the heat recovery unit is arranged on lamp box backplate, temperature and humidity sensor are arranged on the sampling pipe between sampling head and particulate matter sensor and refrigeration unit. In the utility model, heat recovery unit, filter unit and program-controlled heater can dry the air of sampling, and the device can select drying mode according to temperature and humidity in air, improve the monitoring precision of large particulate matter in air of the device.

Description

Technical Field

[0001] This utility model belongs to the field of air quality monitoring technology, and specifically relates to an atmospheric particulate matter monitoring device based on a taxi roof light. Background Technology

[0002] Due to limitations imposed by geographical location, weather, and other factors, fixed-site monitoring equipment cannot promptly monitor environmental quality at the site of certain sudden pollution incidents. Using a mobile environmental monitoring vehicle equipped with mobile air quality detection equipment allows for immediate access to the pollution site. Unrestricted by time, location, or weather, it possesses real-time data collection, analysis, and transmission capabilities, enabling effective and rapid on-site analysis and monitoring. The monitored indicators include multiple pollutant parameters such as particulate matter concentration and gaseous pollutants, providing accurate technical support for decision-making departments. Due to its comprehensive measurement capabilities, high transmission speed, and flexible mobility, it can also be used for local environmental assessments and air quality monitoring to meet routine environmental monitoring requirements.

[0003] However, a fully-equipped atmospheric environment monitoring vehicle is expensive to build and limited by personnel, lacking the capability for long-term, highly mobile measurements. Taxis, on the other hand, are highly mobile, widely distributed, operate for extended periods, and are numerous, making them particularly suitable as mobile grid points for urban air quality monitoring. Therefore, taxis are the most economical and widely covered carrier for mobile grid monitoring of urban air quality.

[0004] A search revealed that publication number 202023323769.7 discloses an air quality monitoring device based on a taxi roof light, comprising a light box base, a light box cover, and a light box bracket. The light box cover is fixed to the light box base, and the light box base is fixed to the light box bracket. The light box base is fixed with a main control circuit board, a particulate matter collection unit, a gaseous pollutant collection unit, and a backlight LED unit. An advertising LED screen is fixed to the back of the light box cover, and an operating status LED screen is fixed to the protruding part of the front of the light box cover. The operating status LED screen communicates with the in-vehicle fare meter system via a data cable. The particulate matter collection unit, the gaseous pollutant collection unit, the backlight LED unit, and the advertising LED screen are all electrically connected to the main control circuit board. This invention combines professional air quality monitoring methods with the characteristics of taxi operation, enabling large-scale, highly mobile, wide-coverage, and long-term uninterrupted online air quality monitoring. However, the device does not have a dehumidification system. During taxi-based air quality monitoring, water vapor in the environment enters the monitoring device along with the sampled gas, causing condensation on the sampling tube and the surface of electronic components such as sensors. This leads to the following problems: 1. Decreased sensor accuracy: Water droplets adsorbed on the surface of particulate matter (such as PM2.5 and PM10) interfere with the measurement of optical sensors, resulting in higher data; 2. Device damage and pipeline blockage: Condensed water may cause short circuits, corrosion of metal components, or blockage of the gas path, affecting the lifespan and normal operation of the equipment.

[0005] A search revealed an automatic dehumidification and non-condensing vehicle-mounted atmospheric particulate matter monitoring air circuit device with application number 202121335753.X, comprising a light box base plate, a temperature and humidity sensor device, and a heating device. The inner bottom surface of the light box base plate is provided with a gas sampling head, an electromagnetic pump, an air inlet pipe, an atmospheric particulate matter monitoring sensor device, an air outlet pipe, and an exhaust head, which are sequentially connected along the gas monitoring flow direction. The temperature and humidity sensor device includes a first temperature and humidity sensor disposed in the air inlet chamber and a second temperature and humidity sensor disposed in the atmospheric particulate matter monitoring sensor device. The heating device includes a heating wire assembly disposed in the air inlet chamber and a V-shaped heating plate disposed in the atmospheric particulate matter monitoring sensor device. The first temperature and humidity sensor corresponds to the heating wire assembly, and the second temperature and humidity sensor corresponds to the V-shaped heating plate. This invention can prevent condensation when the airflow passes through various electronic devices by heating and dehumidifying the sampled gas, thereby ensuring the normal operation of atmospheric particulate matter monitoring. Although the device can use a heating device to heat and dehumidify the sampled gas, this dehumidification method is singular, has high energy consumption, and lacks the ability to adapt to different environmental humidity levels. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an atmospheric particulate matter monitoring device based on a taxi roof light. The heat recovery unit, filter unit, and programmed heater in this device can all dry the sampled air. Furthermore, the device can select the drying method according to the temperature and humidity of the air, thereby improving the monitoring accuracy of large particulate matter in the air.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An atmospheric particulate matter monitoring device based on a taxi roof light includes a heat recovery unit, a sampling head, an exhaust head, a sampling tube, a back panel of the light box, and a bottom plate of the light box. The back panel of the light box is located on one side of the bottom plate of the light box. The sampling head and the exhaust head are respectively located at both ends of the sampling tube. A programmable heater, a cooling unit, a particulate matter sensor, and an air pump are sequentially connected along the gas flow direction on the sampling tube. A filter unit is located at the bottom of the sampling head. The heat recovery unit is located on the back panel of the light box and is connected to the sampling head and the exhaust head. Temperature and humidity sensors are installed on the sampling head and the sampling tube between the particulate matter sensor and the cooling unit.

[0008] Preferably, the device also includes a communication board and a controller. Both the communication board and the controller are mounted on the base plate of the light box. The communication board is connected to the controller. The air pump, programmed heater, heat recovery unit, cooling unit, particulate matter sensor, and temperature and humidity sensor are all connected to the controller. The controller facilitates the control of the air pump, programmed heater, heat recovery unit, cooling unit, particulate matter sensor, and temperature and humidity sensor, ensuring that the device can work normally.

[0009] Preferably, the filtration unit includes a filter screen, a microporous filter, and a drying filter. The filter screen is connected to the sampling head, the microporous filter is disposed inside the filter screen, and the drying filter is disposed inside the microporous filter. The filtration unit can filter out impurities in the air, and the drying filter can preliminarily dry the water vapor in the sampled gas, ensuring the accuracy of gas monitoring.

[0010] Preferably, the filter screen and the microporous filter are of the same length, and the length of the drying filter is shorter than that of the microporous filter. This prevents the drying filter from directly contacting the air and prevents large particulate impurities in the air from clogging the drying filter, ensuring the normal operation of the drying filter. The water droplets and mist in the sampled large particulate matter first pass through the microporous filter. The microporous filter and the drying filter pre-dry the sampled gas, which can remove large particulate water droplets and mist, greatly reducing the humidity load inside the sampling tube.

[0011] Preferably, the interior of the drying filter is filled with a solid moisture-absorbing material. The solid moisture-absorbing material is used to initially absorb water vapor in the sampled gas, preventing high water vapor content in the gas from causing blockage of metal parts and improving the service life of the device.

[0012] Preferably, the refrigeration unit includes a condenser box, a condenser plate, a thermoelectric cooler, a peristaltic pump, a water collection tank, a drain pipe, and a one-way valve. The condenser box is installed on the sampling tube, and a water collection tank is opened at the bottom of the condenser box. One end of the drain pipe is connected to the water collection tank, and a one-way valve is installed at the other end of the drain pipe. The condenser plate is located inside the condenser box and above the water collection tank. The thermoelectric cooler is located on one side of the condenser box. The hot end of the thermoelectric cooler is connected to the heat recovery unit, and the cold end of the thermoelectric cooler is connected to the condenser box. The peristaltic pump is located below the condenser box and works in conjunction with the drain pipe. The refrigeration unit can cool down the sampled gas with a high temperature. It can not only condense the residual water vapor in the sampled gas into water droplets and dehumidify the sampled gas, but also prevent the internal components of the device from being damaged by excessive temperature, thus ensuring the normal operation of the device.

[0013] Preferably, the heat recovery unit includes a finned heat collector, a heat exchanger, and a heat-conducting strip. The finned heat collector is mounted on the back panel of the light box, the heat exchanger is mounted on the finned heat collector, and the two ends of the heat-conducting strip are respectively connected to the heat exchanger, the sampling head, or the exhaust head. The heat recovery unit can recover the heat inside the light box and use it to dehumidify the sampled gas, thereby improving energy utilization and reducing energy loss.

[0014] Preferably, the tilting heat collector includes pipes, connecting pipes, a circulating pump, a heat collection plate, and tilting fins. Several pipes are arranged sequentially from top to bottom, with connecting pipes at both ends of each pipe, and the pipes are connected to the connecting pipes. Liquid is contained within the pipes and connecting pipes. Several tilting fins are evenly distributed on the pipes. The connecting pipes and tilting fins are connected to the heat collection plate, which is mounted on the back panel of the light box. The circulating pump is located on the heat collection plate and connected to the connecting pipes. Liquid is contained within the pipes. The tilting heat collector can collect heat from inside the light box, and the circulating pump can evenly distribute the heat on the heat collection plate, improving heat exchange efficiency and preventing localized overheating that could damage electronic components inside the light box, thus ensuring the normal operation of the device.

[0015] Preferably, there are at least a plurality of heat exchangers, which are evenly distributed on the heat collection plate. The arrangement of the heat exchangers can transfer the hot air in the light box to the heat collection plate, and under the action of the heat conduction strip, the heat is transported to the exhaust head and discharged through the exhaust head.

[0016] Preferably, two heat exchangers are provided, one near the sampling head and the other near the exhaust head. The heat exchanger near the sampling head is connected to the sampling head via a heat-conducting strip, and the heat exchanger near the exhaust head is connected to the exhaust head via a heat-conducting strip. The heat exchanger near the sampling head can transfer heat into the sampling head to dehumidify the sampled gas, ensuring the device's accuracy in monitoring large particulate matter in the air. The heat exchanger near the exhaust head can transfer heat into the exhaust head, thus transferring the heat inside the lamp box to the outside, ensuring the normal operation of the device.

[0017] The beneficial effects of this utility model are: 1) The heat recovery unit, filtration unit and programmable heater in this device can dry the sampled air. The device can select the drying method according to the temperature and humidity of the air, which improves the monitoring accuracy of large particulate matter in the air.

[0018] 2) The controller of this device is designed to facilitate the control of the air pump, programmable heater, heat recovery unit, refrigeration unit, particulate matter sensor, and temperature and humidity sensor, ensuring that the device can work normally.

[0019] 3) The filter unit of this device can filter out impurities in the air, and the drying filter can preliminarily dry the water vapor in the sampled gas, ensuring the accuracy of gas monitoring.

[0020] 4) The length of the drying filter in this device is shorter than that of the microporous filter, which prevents the drying filter from directly contacting the air and prevents large particulate impurities in the air from clogging the drying filter. This ensures the normal operation of the drying filter. The water droplets and mist in the large particulate matter sampled first pass through the microporous filter. The microporous filter and the drying filter pre-dry the sampled gas, which can remove large particulate water droplets and mist, and greatly reduce the humidity load inside the sampling tube.

[0021] 5) The solid moisture-absorbing material in this device is used to initially absorb water vapor in the sampled gas, preventing high water vapor content in the gas from causing blockage of metal parts and improving the service life of the device.

[0022] 6) The cooling unit of this device can cool down the sampled gas at a high temperature. It can not only condense the residual water vapor in the sampled gas into water droplets and dehumidify the sampled gas, but also prevent the internal components of the device from being damaged by excessive temperature, thus ensuring the normal operation of the device.

[0023] 7) The heat recovery unit of this device can recover the heat inside the lamp box and use it to dehumidify the sampled gas, thereby improving energy utilization and reducing energy loss.

[0024] 8) The finned heat collector in this device can collect heat inside the lamp box, and the circulating pump can evenly distribute the heat on the heat collector plate, improve heat exchange efficiency, avoid local overheating and damage to the electronic components inside the lamp box, and ensure the normal operation of the device.

[0025] 9) The heat exchanger in this device can transfer the hot air inside the lamp box to the heat collection plate, and under the action of the heat conduction strip, the heat is transported to the exhaust head and discharged through the exhaust head.

[0026] 10) The heat exchanger on the side of the device near the sampling head can transfer heat to the sampling head to dehumidify the sampled gas and ensure the accuracy of the device in monitoring large particulate matter in the air. The heat exchanger on the side of the device near the exhaust head can transfer heat to the exhaust head to transfer the heat inside the lamp box to the outside, ensuring the normal operation of the device. Attached Figure Description

[0027] Appendix Figure 1 This is a schematic diagram of the structure of this utility model.

[0028] Appendix Figure 2 This is a schematic diagram of the installation structure of the filter screen and microporous filter in this utility model.

[0029] Appendix Figure 3 This is a schematic diagram of the heat recovery unit in this utility model.

[0030] Appendix Figure 4 This is a schematic diagram of the installation structure of the pipe and connecting pipe in this utility model.

[0031] Appendix Figure 5 This is a schematic diagram of the refrigeration unit in this utility model.

[0032] In the picture: 1. Lightbox base plate; 2. Lightbox back panel; 3. Heat recovery unit; 301. Heat collector plate; 302. Circulation pump; 303. Heat exchanger; 304. Connecting pipe; 305. Pipe; 306. Fin; 307. Heat conduction strip; 4. Sampling tube; 5. Air pump; 6. Particulate matter sensor; 7. Refrigeration unit; 701. Condenser; 702. Peristaltic pump; 703. Check valve; 704. Drain pipe; 705. Water collection tank; 706. Condenser plate; 707. Semiconductor refrigeration chip; 8. Programmable heater; 9. Temperature and humidity sensor; 10. Sampling head; 11. Controller; 12. Communication board; 13. Exhaust head; 14. Filter screen; 15. Microporous filter; 16. Dryer filter. Detailed Implementation

[0033] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] like Figure 1 As shown, an atmospheric particulate matter monitoring device based on a taxi roof light includes a heat recovery unit 3, a sampling head 10, an exhaust head 13, a sampling tube 4, a light box back plate 2, and a light box bottom plate 1. The light box back plate 2 is located on one side of the light box bottom plate 1. The sampling head 10 and the exhaust head 13 are respectively located at both ends of the sampling tube 4. A programmable heater, a cooling unit 7, a particulate matter sensor 6, and an air pump 5 are sequentially connected along the gas flow direction on the sampling tube 4. A filter unit is located at the bottom of the sampling head 10, which is used to perform preliminary dehumidification on the sampled gas.

[0036] like Figure 1 As shown, the heat recovery unit 3 is installed on the back panel 2 of the light box, and the heat recovery unit 3 is connected to the sampling head 10 and the exhaust head 13. The heat recovery unit 3 can recover the heat generated inside the light box, improve the energy recovery and utilization rate, and reduce energy consumption.

[0037] Temperature and humidity sensors 9 are installed on the sampling head 10 and the sampling tube 4 between the particulate sensor 6 and the cooling unit 7. The temperature and humidity sensors 9 are used to measure the temperature and humidity of the sampled gas.

[0038] In this embodiment, as Figure 1The device also includes a communication board 12 and a controller 11. Both the communication board 12 and the controller 11 are mounted on the base plate 1 of the light box. The communication board 12 is connected to the controller 11. The air pump 5, the programmed heater 8, the heat recovery unit 3, the cooling unit 7, the particulate matter sensor 6, and the temperature and humidity sensor 9 are all connected to the controller 11. The controller 11 is designed to facilitate the control of the air pump 5, the programmed heater 8, the heat recovery unit 3, the cooling unit 7, the particulate matter sensor 6, and the temperature and humidity sensor 9, ensuring that the device can work normally.

[0039] The controller 11, communication board 12, air pump 5, programmable heater 8, particulate matter sensor 6, temperature and humidity sensor 9, peristaltic pump 702, and circulation pump 302 are all powered by the vehicle.

[0040] Among them, the controller 11, communication board 12, air pump 5, programmable heater 8, particulate matter sensor 6, temperature and humidity sensor 9, peristaltic pump 702 and circulation pump 302 are all existing products that can be purchased directly on the market, and will not be described in detail here.

[0041] In this embodiment, as Figure 2 As shown, the filtration unit includes a filter screen 14, a microporous filter 15, and a drying filter 16. The filter screen 14 is connected to the sampling head 10. The microporous filter 15 is disposed inside the filter screen 14, and the drying filter 16 is disposed inside the microporous filter 15. The filtration unit can filter out impurities in the air, and the drying filter 16 can perform preliminary drying of water vapor in the sampled gas, ensuring the accuracy of gas monitoring.

[0042] In this embodiment, as Figure 2 As shown, the filter screen 14 and the microporous filter 15 are of the same length, while the length of the drying filter 16 is shorter than that of the microporous filter 15. This prevents the drying filter 16 from directly contacting the air and prevents large particulate impurities in the air from clogging the drying filter 16, thus ensuring the normal operation of the drying filter 16. The water droplets and mist in the large particulate matter sampled first pass through the microporous filter 15. The microporous filter 15 and the drying filter 16 pre-dry the sampled gas, which can remove large particulate water droplets and mist, greatly reducing the humidity load inside the sampling tube 4.

[0043] In this embodiment, as Figure 2 As shown, the interior of the drying filter 16 is filled with solid moisture-absorbing material. The solid moisture-absorbing material is used to initially absorb water vapor in the sampled gas, preventing high water vapor content in the gas from causing blockage of metal parts and improving the service life of the device.

[0044] Among them, solid hygroscopic materials can be hydrophilic materials such as silica gel, analytical sieves, and lime.

[0045] In this embodiment, as Figure 5 As shown, the refrigeration unit 7 includes a condenser box 701, a condenser plate 706, a thermoelectric cooler 707, a peristaltic pump 702, a water collection tank 705, a drain pipe 704, and a one-way valve 703. The condenser box 701 is mounted on the sampling tube 4. A water collection tank 705 is formed at the bottom of the condenser box 701. One end of the drain pipe 704 is connected to the water collection tank 705. The condenser plate 706 is disposed inside the condenser box 701 and above the water collection tank 705. The thermoelectric cooler 707 is disposed on one side of the condenser box 701. The hot end face of the semiconductor refrigeration chip 707 is connected to the heat recovery unit 3, and the cold end face of the semiconductor refrigeration chip 707 is connected to the condenser box 701. The peristaltic pump 702 is located below the condenser box 701 and is coordinated with the drain pipe 704. The refrigeration unit 7 can cool down the sampled gas with a high temperature. It can not only condense the residual water vapor in the sampled gas into water droplets and dehumidify the sampled gas, but also prevent the internal components of the device from being damaged by excessive temperature, thus ensuring the normal operation of the device.

[0046] In this embodiment, as Figure 5 As shown, a one-way valve 703 is provided at the other end of the drain pipe 704. The one-way valve 703 can prevent gas from being transported to the condenser box 701 through the drain pipe 704, thus ensuring the accuracy of the device in monitoring large particulate matter in the air.

[0047] In this embodiment, as Figure 3 , Figure 4 As shown, the heat recovery unit 3 includes a finned heat collector, a heat exchanger 303, and a heat-conducting strip 307. The finned heat collector is mounted on the back panel 2 of the light box, and the heat exchanger 303 is mounted on the finned heat collector. The two ends of the heat-conducting strip 307 are respectively connected to the heat exchanger 303, the sampling head 10, or the exhaust head 13. The heat recovery unit 3 can recover the heat inside the light box and use it to dehumidify the sampled gas, thereby improving energy utilization and reducing energy loss.

[0048] In this embodiment, as Figure 4As shown, the tilting heat collector includes pipes 305, connecting pipes 304, a circulating pump 302, a heat collection plate 301, and tilting fins 306. Several pipes 305 are arranged sequentially from top to bottom. Connecting pipes 304 are provided at both ends of each pipe 305, and the pipes 305 are connected to the connecting pipes 304. The heat collection plate 301 is mounted on the back panel 2 of the light box. The circulating pump 302 is mounted on the heat collection plate 301 and connected to the connecting pipes 304. The connecting pipes 304 connect all the pipes 305. Liquid is placed inside each pipe 305. The circulating pump 302 drives the liquid inside the pipes 305 to circulate repeatedly, i.e., the circulating pump 302 drives the liquid to flow within the pipes 305 and connecting pipes 304, facilitating the even distribution of heat on the heat collection plate 301 under the action of the circulating pump 302. The tilting heat collector collects heat from inside the light box.

[0049] like Figure 4 As shown, several fins 306 are provided, and the fins 306 are evenly distributed on the pipe 305. The connecting pipe 304 and the fins 306 are both connected to the heat collection plate 301. The arrangement of the fins 306 facilitates the conduction of heat inside the lamp box to the heat collection plate 301, thereby improving the heat collection efficiency.

[0050] The circulation pump 302 can evenly distribute the heat on the heat collection plate 301, improve the heat exchange efficiency, avoid local overheating that could damage the electronic components inside the lamp box, and ensure the normal operation of the device.

[0051] In this embodiment, as Figure 1 As shown, there are at least a plurality of heat exchangers 303, which are evenly distributed on the heat collection plate 301. The arrangement of the heat exchangers 303 can transfer the hot air in the light box to the heat collection plate 301, and under the action of the heat conduction strip 307, the heat is transported to the exhaust head 13, and the heat is discharged through the exhaust head 13.

[0052] In this embodiment, as Figure 1 As shown, there are two heat exchangers 303. The two heat exchangers 303 are respectively located near the sampling head 10 and the exhaust head 13. The heat exchanger 303 near the sampling head 10 is connected to the sampling head 10 through a heat-conducting strip 307, and the heat exchanger 303 near the exhaust head 13 is connected to the exhaust head 13 through a heat-conducting strip 307.

[0053] The heat exchanger 303 located near the sampling head 10 can transfer heat into the sampling head 10 to dehumidify the sampled gas, ensuring the device's accuracy in monitoring large particulate matter in the air. The heat exchanger 303 located near the exhaust head 13 can transfer heat into the exhaust head 13, thereby transferring the heat inside the lamp box to the outside, ensuring the normal operation of the device.

[0054] Working principle: In a dry environment at room temperature (e.g., temperature between 15-30℃, humidity between 30%-50%): When the temperature and humidity sensor 9 at the sampling head 10 detects that the sampled gas is at normal temperature and humidity, the drying filter 16 and microporous filter 15 at the sampling head 10 can achieve the dehumidification effect, and the programmable heater, heat recovery unit 3 and semiconductor refrigeration unit 7 are turned off by the controller 11.

[0055] Normal temperature and low humidity environment (e.g., temperature between 15-30℃, humidity between 50%-80%): When the temperature and humidity sensor 9 at the sampling head 10 detects that the sampled gas is at room temperature and low humidity, the ideal dehumidification effect cannot be achieved by the drying filter 16 and microporous filter 15 at the sampling head 10 alone. At this time, it is necessary to turn on the heat recovery unit 3 through the controller 11 and turn off the programmable heating controller 11 and the semiconductor cooling unit 7, so as to use the heat inside the vehicle dome light to heat and dehumidify the sampled gas.

[0056] Low temperature and high humidity environment (e.g., temperature <15℃, humidity >80%): When the temperature and humidity sensor 9 at the sampling head 10 detects that the sampled gas is low temperature and high humidity, the heat recovery unit 3 and the programmable heating controller 11 need to be turned on and the semiconductor cooling unit 7 needs to be turned off through the controller 11.

[0057] High temperature and high humidity environment (e.g., temperature between 30-40℃, humidity > 80%): When the temperature and humidity sensor 9 at the sampling head 10 detects that the sampled gas is at high temperature and high humidity, the heat recovery unit 3 and the semiconductor cooling unit 7 need to be turned on to heat and then cool the gas, so as to separate the water vapor from the gas and achieve the purpose of drying the sampled gas.

[0058] The above content is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of this utility model, they should all fall within the protection scope of this utility model.

Claims

1. An atmospheric particulate matter monitoring device based on a taxi roof light, comprising a sampling head, an exhaust head, a sampling tube, a light box back panel, and a light box bottom plate, characterized in that, It also includes a heat recovery unit. The back panel of the light box is set on one side of the bottom plate of the light box. The sampling head and the exhaust head are respectively set at both ends of the sampling tube. A programmable heater, a cooling unit, a particulate matter sensor and an air pump are arranged sequentially along the gas flow direction on the sampling tube. A filter unit is set at the bottom of the sampling head. The heat recovery unit is set on the back panel of the light box and is connected to the sampling head and the exhaust head. Temperature and humidity sensors are set on the sampling head and the sampling tube between the particulate matter sensor and the cooling unit.

2. The atmospheric particulate matter monitoring device based on a taxi roof light according to claim 1, characterized in that, It also includes a communication board and a controller, both of which are mounted on the base plate of the light box. The communication board is connected to the controller, and the air pump, programmable heater, heat recovery unit, refrigeration unit, particulate matter sensor, and temperature and humidity sensor are all connected to the controller.

3. The atmospheric particulate matter monitoring device based on a taxi roof light according to claim 1, characterized in that, The filtration unit includes a filter screen, a microporous filter, and a drying filter. The filter screen is connected to the sampling head, the microporous filter is disposed inside the filter screen, and the drying filter is disposed inside the microporous filter.

4. The atmospheric particulate matter monitoring device based on a taxi roof light according to claim 3, characterized in that, The filter screen and the microporous filter are of the same length, while the length of the drying filter is shorter than that of the microporous filter.

5. The atmospheric particulate matter monitoring device based on a taxi roof light according to claim 4, characterized in that, The interior of the dryer filter is filled with solid moisture-absorbing material.

6. The atmospheric particulate matter monitoring device based on a taxi roof light according to claim 1, characterized in that, The refrigeration unit includes a condenser box, a condenser plate, a thermoelectric cooler, a peristaltic pump, a water collection tank, a drain pipe, and a one-way valve. The condenser box is installed on the sampling tube, and a water collection tank is opened at the bottom of the condenser box. One end of the drain pipe is connected to the water collection tank, and a one-way valve is installed at the other end of the drain pipe. The condenser plate is located inside the condenser box and above the water collection tank. The thermoelectric cooler is located on one side of the condenser box. The hot end of the thermoelectric cooler is connected to the heat recovery unit, and the cold end of the thermoelectric cooler is connected to the condenser box. The peristaltic pump is located below the condenser box and works in conjunction with the drain pipe.

7. The atmospheric particulate matter monitoring device based on a taxi roof light according to claim 1, characterized in that, The heat recovery unit includes a finned heat collector, a heat exchanger, and a heat-conducting strip. The finned heat collector is mounted on the back panel of the light box, the heat exchanger is mounted on the finned heat collector, and the two ends of the heat-conducting strip are respectively connected to the heat exchanger, the sampling head, or the exhaust head.

8. An atmospheric particulate matter monitoring device based on a taxi roof light according to claim 7, characterized in that, The finned heat collector includes pipes, connecting pipes, a circulating pump, a heat collection plate, and fins. Several pipes are arranged sequentially from top to bottom, with connecting pipes at both ends of each pipe, and the pipes are connected to the connecting pipes. Liquid is contained within the pipes and connecting pipes. Several fins are evenly distributed on the pipes. The connecting pipes and fins are connected to the heat collection plate, which is mounted on the back panel of the light box. The circulating pump is mounted on the heat collection plate and connected to the connecting pipes. Liquid is contained within the pipes.

9. An atmospheric particulate matter monitoring device based on a taxi roof light according to claim 8, characterized in that, There are at least a plurality of heat exchangers, which are evenly distributed on the heat collection plate.

10. An atmospheric particulate matter monitoring device based on a taxi roof light according to claim 9, characterized in that, There are two heat exchangers, which are respectively located near the sampling head and the exhaust head. The heat exchanger near the sampling head is connected to the sampling head through a heat-conducting strip, and the heat exchanger near the exhaust head is connected to the exhaust head through a heat-conducting strip.

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