CN113513835A - Monitoring control device and system for indoor air quality - Google Patents
Monitoring control device and system for indoor air quality Download PDFInfo
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- CN113513835A CN113513835A CN202110932635.5A CN202110932635A CN113513835A CN 113513835 A CN113513835 A CN 113513835A CN 202110932635 A CN202110932635 A CN 202110932635A CN 113513835 A CN113513835 A CN 113513835A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B64C—AEROPLANES; HELICOPTERS
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- B64C39/02—Aircraft not otherwise provided for characterised by special use
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64U30/00—Means for producing lift; Empennages; Arrangements thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64U50/00—Propulsion; Power supply
- B64U50/10—Propulsion
- B64U50/19—Propulsion using electrically powered motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
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- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
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- F24F11/58—Remote control using Internet communication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention relates to the technical field of indoor air quality monitoring, and discloses a monitoring and controlling device for indoor air quality. The invention can construct the environment of the device into a virtual space map, establish a coordinate system, start the unmanned aerial vehicle, utilize the air quality monitoring sensor group on the unmanned aerial vehicle to monitor the air quality at different heights in the room on a specified path, thereby achieving the purpose of monitoring the air quality at a plurality of specified positions.
Description
Technical Field
The invention relates to the technical field of air monitoring, in particular to a monitoring and controlling device and a monitoring and controlling system for indoor air quality.
Background
In modern cities, the degree of indoor air pollution is many times higher than that of outdoor air pollution, more importantly, more than 80% of urban population spends seven times indoors, children, pregnant women and chronic patients stay indoors for a longer time than other people, the indoor air pollution is more obviously damaged, the indoor environment pollution problem becomes a main problem affecting the health and safety of people in modern society, and many people do not realize the problem, so that the improvement of the indoor air environment is an urgent need of the modern society for first life safety and body health.
In the process of implementing the invention, the inventor finds that at least the following problems in the prior art are not solved: present air monitoring devices is when using, fix the indoor air of indoor certain position monitoring usually, but fixed point monitoring leads to the monitoring data not accurate easily, because this position generally all is the wall, positions such as ceiling, not the position that people often are, the data of monitoring do not possess the representativeness, influence the user to the judgement of room air quality, and if adopt the mode monitoring air of fixed point monitoring, in order to improve the accuracy of monitoring, can set for the monitoring point in a plurality of positions usually, also can influence the pleasing to the eye of interior decoration like this.
Disclosure of Invention
The invention aims to provide a monitoring and controlling device and a system for indoor air quality, which solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a monitoring and controlling device for indoor air quality comprises a box body, wherein a containing groove is formed in the top side of the box body, a charging mechanism is arranged in the middle of the bottom side of the inside of the containing groove, an unmanned aerial vehicle is movably arranged on the top side of the charging mechanism, an air quality monitoring sensor group is fixedly installed on the front side of the unmanned aerial vehicle, and a distance measuring sensor is fixedly installed on the top side of the unmanned aerial vehicle;
one side fixed mounting at box top has laser radar, the bottom fixed mounting of box has the thermal imaging camera.
As a preferred embodiment of the present invention, an electromagnetic block is fixedly installed in the bottom side of the interior of the receiving groove in an embedded manner, and a suction block adapted to the electromagnetic block is fixedly installed on the bottom side of the support of the unmanned aerial vehicle.
As a preferred embodiment of the present invention, the charging mechanism is a wireless charging module, and a storage battery is disposed in the unmanned aerial vehicle at a position corresponding to the charging mechanism.
In a preferred embodiment of the present invention, the distance measuring sensor is a laser distance measuring sensor.
As a preferred embodiment of the present invention, the air quality monitoring sensor group includes one or more of a dust sensor, a temperature and humidity sensor, a formaldehyde sensor, a carbon dioxide sensor, a PM10 sensor, a PM2.5 sensor, an ozone sensor, a benzene sensor, a toluene sensor, a xylene sensor, a TVOC sensor, an ammonia sensor, a radon sensor, and a microorganism sensor.
As a preferred embodiment of the present invention, a display screen is fixedly installed on the right side of the box body.
In a preferred embodiment of the present invention, a connecting plate is fixedly installed on the left side of the box body, and bolts are horizontally movably connected to both upper and lower sides of the connecting plate in a penetrating manner.
A monitoring and control system for indoor air quality is applied to a monitoring and control device for indoor air quality and comprises a map generation system, an unmanned aerial vehicle system, a fresh air system and a receiving terminal, wherein the map generation system is arranged in a base, and the unmanned aerial vehicle system is arranged in an unmanned aerial vehicle;
the map generation system comprises an indoor space map generation module, a coordinate system establishment module, a data storage module, a first central processing unit and a first wireless transmission module, wherein signal output and input ends of the indoor space map generation module, the coordinate system establishment module, the data storage module and the first wireless transmission module are all connected with a signal output and input end of the first central processing unit, signal output ends of the laser radar and the thermal imaging camera are connected with a signal input end of the first central processing unit, and a signal output end of the first central processing unit is connected with signal input ends of the display screen, the electromagnetic block and the fresh air system;
the unmanned aerial vehicle system comprises a second wireless transmission module, a timing module, a path planning module, a second central processing unit and a driving module, wherein the signal output and input ends of the second wireless transmission module, the timing module, the path planning module, the laser ranging sensor and the air environment monitoring sensor group are all connected with the signal output and input end of the second central processing unit, and the signal output end of the second central processing unit is connected with the signal input end of the driving module;
the driving modules comprise driving motors and propellers, the number of the driving modules is four, and the driving modules are all arranged on wings of the unmanned aerial vehicle;
the signal output and input end of the first wireless transmission module is connected with the signal output and input end of the second wireless transmission module, and the signal output end of the first wireless transmission module is connected with the signal input end of the receiving terminal.
As a preferred embodiment of the present invention, the first wireless transmission module and the second wireless transmission module are both 5G modules, and the receiving terminal is one of a smart phone, a tablet computer, a desktop computer, and a notebook computer.
Compared with the prior art, the invention provides a monitoring and controlling device and a system for indoor air quality, which have the following beneficial effects:
when the monitoring control device and the system for the indoor air quality are used, the environment where the device is located can be constructed into a virtual space map, a coordinate system is established, the unmanned aerial vehicle is started, the air quality at different indoor heights is monitored on a specified path by utilizing an air quality monitoring sensor group on the unmanned aerial vehicle, so that the aim of monitoring the air quality at a plurality of specified positions is fulfilled, meanwhile, the air quality monitoring data are analyzed and processed, if the air quality is poor, the existing fresh air system can be started in a matched manner to purify the indoor air, and the high-quality indoor air quality is ensured. Meanwhile, the indoor decoration effect cannot be influenced, and the using effect of the prior art is effectively improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a front view of an indoor air quality monitoring and controlling apparatus according to the present invention;
fig. 2 is a system block diagram of an indoor air quality monitoring and controlling system according to the present invention; .
In the figure: 1. a box body; 2. a receiving groove; 3. a charging mechanism; 4. an unmanned aerial vehicle; 5. an air quality monitoring sensor group; 6. a ranging sensor; 7. a laser radar; 8. a thermal imaging camera; 9. a connecting plate; 10. an electromagnetic block; 11. sucking blocks; 12. a bolt; 13. a fresh air system; 14. a timing module; 15. a path planning module; 16. a driving module; 17. a second wireless transmission module; 18. a display screen; 19. a map generation system; 20. an unmanned aerial vehicle system; 21. a receiving terminal; 22. an indoor space map generation module; 23. a coordinate system establishing module; 24. a data storage module; 25. a first central processing unit; 26. a second wireless transmission module; 27. a second central processing unit.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly, e.g., as meaning fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed; the type of the electrical appliance provided by the invention is only used for reference. For those skilled in the art, different types of electrical appliances with the same function can be replaced according to actual use conditions, and for those skilled in the art, the specific meaning of the above terms in the present invention can be understood in specific situations.
Referring to fig. 1-2, the present invention provides a technical solution: a monitoring and controlling device for indoor air quality comprises a box body 1, wherein a storage groove 2 is formed in the top side of the box body 1, a charging mechanism 3 is arranged in the middle of the bottom side inside the storage groove 2, an unmanned aerial vehicle 4 is movably arranged on the top side of the charging mechanism 3, the unmanned aerial vehicle 4 is stored in the storage groove 2, the charging mechanism 3 can charge the unmanned aerial vehicle 4, an air quality monitoring sensor group 5 is fixedly installed on the front side of the unmanned aerial vehicle 4, the air quality monitoring sensor group 5 is used for detecting the air quality, a distance measuring sensor 6 is fixedly installed on the top side of the unmanned aerial vehicle 4, and the distance measuring sensor 6 is used for measuring the distance from the top of the unmanned aerial vehicle 4 to a ceiling so as to calculate the height of the unmanned aerial vehicle 4;
one side fixed mounting at 1 top of box has laser radar 7, and laser radar 7 is used for surveying indoor environment to in the generation indoor space map, the bottom fixed mounting of box has thermal imaging camera 8, and thermal imaging camera 8 is used for detecting indoor whether someone.
In this embodiment, the bottom side embedding fixed mounting of holding 2 insides in groove has electromagnetic block 10, unmanned aerial vehicle 4's support bottom side fixed mounting have with electromagnetic block 10 looks adaptation inhale the piece 11, electromagnetic block 10 can hold and inhale piece 11, be convenient for fixed unmanned aerial vehicle 4.
In this embodiment, charging mechanism 3 is the wireless module of charging, be provided with the battery in 4 inside and the corresponding position of charging mechanism 3 of unmanned aerial vehicle, charging mechanism 3 can charge for unmanned aerial vehicle 4 with the mode of wireless charging.
In this embodiment, the distance measuring sensor 6 is a laser distance measuring sensor.
In this embodiment, air quality monitoring sensor group 5 includes one or more of dust sensor, temperature and humidity sensor, formaldehyde sensor, carbon dioxide sensor, PM10 sensor, PM2.5 sensor, ozone sensor, benzene sensor, toluene sensor, xylene sensor, volatile organic compounds TVOC sensor, ammonia sensor, radon gas sensor and microbial sensor, is convenient for carry out comprehensive quality detection to the air.
In this embodiment, the right side of the box body 1 is fixedly provided with a display screen 18, which is convenient for displaying detected data.
In this embodiment, the left side fixed mounting of box 1 has connecting plate 9, the equal activity run-through of upper and lower both sides of connecting plate 9 has bolt 12, is convenient for install this device on the wall.
A monitoring and control system for indoor air quality is applied to a monitoring and control device for indoor air quality and comprises a map generation system 19, an unmanned aerial vehicle system 20, a fresh air system 13 and a receiving terminal 21, wherein the map generation system 19 is arranged in a base 1, and the unmanned aerial vehicle system is arranged in an unmanned aerial vehicle 4;
the map generation system 19 includes an indoor space map generation module 22, a coordinate system establishment module 23, a data storage module 24, a first central processing unit 25 and a first wireless transmission module 26, the signal output and input ends of the indoor space map generation module 22, the coordinate system establishment module 23, the data storage module 24 and the first wireless transmission module 26 are all connected with the signal output and input end of the first central processing unit 25, the signal output ends of the laser radar 7 and the thermal imaging camera 8 are connected with the signal input end of the first central processing unit 25, the space map generation module 22 and the coordinate system establishment module 23 cooperate with the laser radar 7 to complete the generation of indoor simulation space, the thermal imaging camera 8 judges whether the unmanned aerial vehicle 4 is started according to whether a person is indoors or not, the signal output end of the first central processing unit 25 is connected with the signal input ends of the display screen 18, the electromagnetic block 10 and the fresh air system 13;
the unmanned aerial vehicle system 20 comprises a second wireless transmission module 17, a timing module 14, a path planning module 15, a second central processing unit 27 and a driving module 16, wherein signal output and input ends of the second wireless transmission module 26, the timing module 14, the path planning module 15, the distance measuring sensor 6 and the air environment monitoring sensor group 5 are all connected with a signal output and input end of the second central processing unit 27, a signal output end of the second central processing unit 27 is connected with a signal input end of the driving module 16, the timing module 14 is used for starting the unmanned aerial vehicle 4 at regular time, the path planning module 15 is used for controlling the unmanned aerial vehicle 4 to fly in a designated path, and the technology is disclosed at the moment;
the driving modules 16 comprise driving motors and propellers, the number of the driving modules 16 is four, and the driving modules are all arranged on the wings of the unmanned aerial vehicle 4;
the signal output and input end of the first wireless transmission module 26 is connected with the signal output and input end of the second wireless transmission module 17, and the signal output end of the first wireless transmission module 26 is connected with the signal input end of the receiving terminal 21.
In this embodiment, the first wireless transmission module 26 and the second wireless transmission module 17 are both 5G modules, and the receiving terminal 21 is one of a smart phone, a tablet computer, a desktop computer, and a notebook computer.
When the system works, the laser radar 7 firstly scans indoor space data, the scanning data of the laser radar 7 is analyzed and simulated into a three-dimensional map through the indoor space map generating module 22 and the coordinate system establishing module 23, and a coordinate system is established according to the three-dimensional map (it should be explained here that a navigation system formed by the laser radar 7, the indoor space map generating module 22 and the coordinate system establishing module 23 is the prior art, and specifically, a sweeping robot in the prior art can be referred to, so the detailed principle is not repeated here), when monitoring, the thermal imaging camera 8 firstly detects whether a person is in a room, if no person is in the room, the driving module 9 on the unmanned aerial vehicle 4 is started through the timing module 14, so that the unmanned aerial vehicle 4 monitors the air quality of a plurality of indoor position points according to the planned path of the path planning module 15, and the monitored data is processed through the second central processing unit 27, the second wireless transmission module 17, the first central processing unit and the first wireless transmission module 26 respectively transmit the information to the display screen 18 and the receiving terminal 21, and meanwhile, if the air quality at a certain position is low, the first central processing unit 13 sends a signal to a fresh air system to complete air purification.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The utility model provides a monitoring control device of indoor air quality which characterized in that: the intelligent air quality monitoring system comprises a box body (1), wherein a containing groove (2) is formed in the top side of the box body (1), a charging mechanism (3) is arranged in the middle of the bottom side of the interior of the containing groove (2), an unmanned aerial vehicle (4) is movably arranged on the top side of the charging mechanism (3), an air quality monitoring sensor group (5) is fixedly installed on the front side of the unmanned aerial vehicle (4), and a distance measuring sensor (6) is fixedly installed on the top side of the unmanned aerial vehicle (4);
one side fixed mounting at box (1) top has laser radar (7), the bottom fixed mounting of box has thermal imaging camera (8).
2. An indoor air quality monitoring and control device as claimed in claim 1, wherein: accomodate the inside bottom side embedding fixed mounting in groove (2) and have electromagnetic block (10), the support bottom side fixed mounting of unmanned aerial vehicle (4) has with electromagnetic block (10) looks adaptation inhale piece (11).
3. An indoor air quality monitoring and control device as claimed in claim 1, wherein: charging mechanism (3) are the wireless module that charges, be provided with the battery in unmanned aerial vehicle (4) inside and charging mechanism (3) corresponding position.
4. An indoor air quality monitoring and control device as claimed in claim 1, wherein: the distance measuring sensor (6) is a laser distance measuring sensor.
5. An indoor air quality monitoring and control device as claimed in claim 1, wherein: the air quality monitoring sensor group (5) comprises one or more of a dust sensor, a temperature and humidity sensor, a formaldehyde sensor, a carbon dioxide sensor, a PM10 sensor, a PM2.5 sensor, an ozone sensor, a benzene sensor, a toluene sensor, a xylene sensor, a volatile organic compound (TVOC) sensor, an ammonia sensor, a radon gas sensor and a microorganism sensor.
6. An indoor air quality monitoring and control device as claimed in claim 1, wherein: and a display screen (18) is fixedly arranged on the right side of the box body (1).
7. An indoor air quality monitoring and control device as claimed in claim 6, wherein: the box body (1) is characterized in that a connecting plate (9) is fixedly mounted on the left side of the box body (1), and bolts (12) are horizontally and movably connected to the upper side and the lower side of the connecting plate (9) in a penetrating mode.
8. An indoor air quality monitoring and control system applied to the indoor air quality monitoring and control device of claims 1 to 7, characterized in that: the novel air conditioner comprises a map generation system (19), an unmanned aerial vehicle system (20), a fresh air system (13) and a receiving terminal (21), wherein the map generation system (19) is arranged in a base (1), and the unmanned aerial vehicle system is arranged in an unmanned aerial vehicle (4);
the map generation system (19) comprises an indoor space map generation module (22), a coordinate system establishment module (23), a data storage module (24), a first central processing unit (25) and a first wireless transmission module (26), signal output input ends of the indoor space map generation module (22), the coordinate system establishment module (23), the data storage module (24) and the first wireless transmission module (26) are connected with a signal output input end of the first central processing unit (25), signal output ends of the laser radar (7) and the thermal imaging camera (8) are connected with a signal input end of the first central processing unit (25), and a signal output end of the first central processing unit (25) is connected with signal input ends of the display screen (18), the electromagnetic block (10) and the fresh air system (13);
the unmanned aerial vehicle system (20) comprises a second wireless transmission module (17), a timing module (14), a path planning module (15), a second central processing unit (27) and a driving module (16), signal output and input ends of the second wireless transmission module (26), the timing module (14), the path planning module (15), the distance measuring sensor (6) and the air quality monitoring sensor group (5) are connected with a signal output and input end of the second central processing unit (27), and a signal output end of the second central processing unit (27) is connected with a signal input end of the driving module (16);
the driving modules (16) comprise driving motors and propellers, the number of the driving modules (16) is four, and the driving modules are all arranged on wings of the unmanned aerial vehicle (4);
the signal output input end of the first wireless transmission module (26) is connected with the signal output input end of the second wireless transmission module (17), and the signal output end of the first wireless transmission module (26) is connected with the signal input end of the receiving terminal (21).
9. A monitoring and control system for indoor air quality as claimed in claim 8, wherein: the first wireless transmission module (26) and the second wireless transmission module (17) are both 5G modules, and the receiving terminal (21) is one of a smart phone, a tablet computer, a desktop computer and a notebook computer.
Priority Applications (1)
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CN115183371A (en) * | 2022-07-13 | 2022-10-14 | 江苏阿尔特空调实业有限责任公司 | Indoor air circulation system with toxic gas concentration exceeding warning function |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115183371A (en) * | 2022-07-13 | 2022-10-14 | 江苏阿尔特空调实业有限责任公司 | Indoor air circulation system with toxic gas concentration exceeding warning function |
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