4804 results about "Fresh air" patented technology

The invention discloses a clean workshop production environment quality control method and system, and relates to the technical field of environment control, and the method comprises the steps: constructing a multi-layer sensing network, deploying temperature and humidity, particle concentration, pressure difference and VOC gas sensors, and carrying out the preprocessing data of each node through edge calculation; fusing the data based on a dynamic weight distribution algorithm, adjusting the weight according to the confidence score, and generating an environment quality comprehensive index; an LSTM pollution diffusion prediction model is established, a diffusion path is calculated in combination with airflow field simulation when pollution suddenly occurs, and an emergency response partition strategy is generated; fresh air system control parameters are optimized through reinforcement learning, a dynamic ventilation frequency adjusting model is established based on a real-time environment quality index and historical energy consumption data, and energy consumption is minimized through a Q-learning algorithm on the premise that cleanliness is guaranteed; a double-threshold early warning mechanism is set, local supercharging purification is started when a comprehensive index exceeds a first-level threshold, a second-level threshold is linked with adjacent areas to form a dynamic isolation barrier, and an intervention scheme effect is simulated through a digital twin system.

The invention discloses an airport terminal fresh air energy-saving optimization control method based on passenger space-time distribution prediction, and relates to the technical field of intelligent energy saving, and the method comprises the following steps: S100, collecting the real-time position and moving speed of a passenger, constructing a passenger space-time distribution change model, and forming a prediction basis of air pressure dynamic adjustment; and S200, based on the passenger space-time distribution change model, calculating air pressure gradient distribution of each functional area of the terminal, identifying local positive pressure and adjacent negative pressure areas, establishing a micro pressure difference grading early warning index, and determining a ventilation adjustment demand. By dynamically predicting passenger distribution, adjusting air supply and static pressure in real time and combining pressure difference early warning, airflow monitoring and countercurrent sealing control, airflow order is ensured, pollution gas is prevented from flowing backwards, and air quality and comfort are guaranteed. Based on a control model and an energy-saving strategy library of full-process data training, intelligent self-adaptive adjustment of the fresh air system is achieved, ventilation safety and energy efficiency are improved, and terminal service experience and operation efficiency are optimized.

The invention relates to the technical field of industrial control, and discloses an energy-saving air conditioner intelligent control system which comprises an edge computing node, a dynamic load prediction module, a self-adaptive control module, an energy consumption optimization evaluation module and a fault diagnosis module. A data acquisition module, a real-time control module and a communication interface are integrated; based on the historical environment data and the air conditioner operation log, a long-short-term memory network model is adopted to predict the expected load demand in 2-4 hours in the future; dynamically adjusting the operation number of chilled water units, the frequency conversion frequency of water pumps and the opening degree of fresh air valves according to the expected load requirement; the unit cold energy consumption of a single air conditioner is calculated in real time, and a global optimization instruction is generated in combination with a time-of-use electricity price strategy; motor current harmonic characteristics are collected through the edge calculation nodes, the abnormity of the air conditioner is recognized, graded response is conducted, the intelligent control efficiency of the energy-saving air conditioner is improved, and the overall energy consumption cost of the air conditioner is reduced.

The invention relates to the technical field of constructional engineering, and discloses an intelligent ventilation and purification method and system for constructional engineering, and the method comprises the steps: 1, determining the concentration of pollutants in a building based on real-time air quality data, and calculating the required ventilation quantity meeting a preset standard; secondly, the fresh air introduction proportion is adjusted according to the indoor and outdoor temperature and humidity difference value so as to optimize energy consumption and thermal comfort balance; 3, according to the personnel distribution density, the local area air supply intensity is set, and the air circulation uniformity is ensured; fourthly, the system operation mode is regulated and controlled based on the working state of the air purification equipment, so that energy consumption is reduced, and the service life of the equipment is prolonged; the fresh air introduction proportion is intelligently adjusted by comparing indoor and outdoor temperature and humidity differences. For example, when the outdoor temperature and humidity are close to the indoor comfortable interval, the fresh air volume is increased to utilize natural cold and heat sources; when the outdoor environment is extreme, the fresh air volume is reduced, the heat recovery device is started, the air conditioner load is reduced, and energy waste is reduced.

The invention relates to the technical field of intelligent building environment control and energy management, and provides a building ventilation regulation and control method and equipment based on multi-target space-time analysis in order to solve the problems of high energy consumption, uncontrollable infection risk and response lag in the prior art. Original data and the spatial-temporal features are combined into a multi-modal fusion data set, an air quality change rule is learned based on an LSTM model, a future air quality state matrix is output, a multi-target dynamic optimization function is constructed, an optimal regulation and control strategy of a fan, fresh air and purification equipment is generated, and the optimal regulation and control strategy of the fan, the fresh air and the purification equipment is obtained. The response speed is improved while energy consumption is reduced and infection risks are controlled, and the system is particularly suitable for public places such as hospitals, schools and nursing homes with high requirements for indoor gas environments.

The invention discloses a building fresh air linkage control system based on the Internet of Things, and relates to the technical field of intelligent control linkage, a sensing acquisition module is used for acquiring building state data, analyzing the building state data according to a priority strategy, analyzing building spaces in different regions, generating region information priorities, and sending the region information priorities to a central processing unit; focusing the key change area according to the area information priority to obtain a building environment potential field graph; the cooperative control module is used for performing multi-region cooperative decision on the building environment potential field graph to obtain an expected environment parameter sequence, and adjusting the expected environment parameter sequence through an optimization algorithm to obtain a fresh air coordination instruction set; and the execution decision module is used for performing multi-objective optimization on the fresh air coordination instruction set, generating an equipment-level control instruction, issuing the control instruction to a building equipment executor and completing accurate control of the fresh air system. According to the system, an optimized and convergent fresh air closed-loop control mechanism is established, operation of cold and heat source equipment is effectively coordinated, the energy-saving effect is achieved, and energy waste is avoided.

The invention relates to the technical field of constant temperature and humidity control, and discloses a multi-effect total heat recovery constant temperature and humidity system. A heat recovery distribution control module of the system analyzes the matching degree of heat recovery efficiency and energy stability and generates a heat recovery distribution control parameter set; the temperature and humidity balance optimization module adjusts the temperature and humidity distribution balance of the cavity and generates a temperature and humidity regulation and control optimization parameter set; the fresh air dynamic regulation module optimizes the fresh air input rate and path distribution and generates a fresh air dynamic regulation result; the abnormal working condition intervention module responds to temperature and humidity fluctuation and generates an abnormal intervention adjustment data set; and the environment parameter optimization module adjusts the target regulation and control path parameters and generates an environment temperature and humidity optimization data table. According to the system, through cooperative work of all the modules, efficient and accurate regulation and control over the environment temperature and humidity are achieved, the stability and adaptability of the system under complex working conditions are improved, and the requirements of modern industrial production and other scenes for high-precision environment control are met.

The invention relates to a liquid air energy storage and terrestrial heat coordinated underground space air regulation and control system and method. Comprising a first-stage compressor, a second-stage compressor, a third-stage compressor, an expansion refrigerator, a first-stage compression heat exchanger, a second-stage compression heat exchanger, a third-stage compression heat exchanger, a cold box, a separator, a liquid air storage tank, a cryogenic pump, an evaporator, a cold storage circulating pump, a cold storage box, a compression heat exchange circulating pump, a compression heat storage box, a first heater, a second heater and a third heater. The system comprises a first air expander, a second air expander, a third air expander and a generator. The regeneration heater is used for guiding the compression heat generated by the compressor into the regeneration heater for regeneration and / or guiding the geothermal energy output by the geothermal energy output end into the regeneration heater for regeneration; the rotary wheel dehumidification device is used for performing cryogenic drying on the wet air; the fresh air processing unit is composed of a fresh air filter, a regeneration fan, a regeneration filter and an air supply fan.

The invention discloses a local space oxygen enrichment control system and method based on an oxygen selective permeable membrane, belongs to the technical field of air purification, environment control and membrane separation, and aims to solve the problems that the indoor oxygen concentration cannot be actively and efficiently increased and compact integration is difficult in the prior art. The system integrates an outdoor fresh air fan, a switching valve, an oxygen enrichment membrane device, an air pump, an indoor air return and supply fan, a gas monitoring control unit, an outdoor exhaust fan and the like, and a control unit dynamically regulates and controls a switching valve passage, the rotating speed of each fan and start and stop of the air pump according to the difference between oxygen sensor data and preset target oxygen concentration; air selectively passes through the oxygen-enriched membrane device to generate oxygen-enriched air or is fed into a room through a bypass air path, and the indoor oxygen concentration is actively stabilized at 21%-26%. The system is suitable for local spaces such as residences and offices, active oxygen enrichment and environment control can be achieved, the air quality is improved, and meanwhile low energy consumption, safety and comfort are taken into account.

The invention relates to the technical field of environment monitoring, in particular to a multifunctional air quality monitoring and early warning system, which comprises a monitoring and adjusting module, a monitoring and early warning module, a monitoring and early warning module, an early warning module and an early warning module, and is characterized in that the monitoring and adjusting module monitors pollutants and temperature and humidity information in air through various sensors and automatically adjusts sensor detection ranges according to air quality conditions; the intelligent early warning module is used for establishing a prediction model, pre-judging the deterioration trend of the indoor air quality in advance through the prediction model, and triggering trend early warning when monitoring that the deterioration risk is high; and the equipment linkage module is used for establishing an equipment linkage rule base and automatically matching an optimal equipment operation strategy according to the air quality data. Various high-precision sensors are integrated, multi-dimensional data of particulate matter, harmful gas, oxygen content and temperature and humidity in air can be comprehensively monitored, the indoor air quality condition is accurately reflected, an air purifier and fresh air system equipment are automatically allocated according to a data analysis result, and intelligent environment adjustment is achieved.

The application relates to a hexagonal air flow plate for an intelligent fresh air system, a processing method thereof and a heat exchange core body, and belongs to the technical field of intelligent fresh air systems. The hexagonal air flow plate for the intelligent fresh air system comprises a hexagonal outer frame and a partition strip in the outer frame, characterized in that the partition strip is in a straight strip shape, and the partition strip is divided into a guide partition strip and a ventilation partition strip; the outer frame comprises two parallel sides and corner sides on the two sides of the parallel sides, the corner sides are four, two corner sides form a group, the corner sides in each group form a right angle, one group of opposite corner sides are provided with air holes, and the other group of opposite corner sides are in a closed structure; the guide partition strip is in a closed structure, air ducts are arranged on the two sides of the guide partition strip, and the two adjacent air ducts are not communicated; the ventilation partition strip is arranged in an angle intersecting with the guide partition strip, and the ventilation partition strip is provided with ventilation holes. The processing method of the hexagonal air flow plate and the core body made of the hexagonal air flow plate are simultaneously provided.

The invention relates to a humidification control method and system for an air cabinet heating air conditioning unit. The humidification control method comprises the following steps that purified fresh air is cooled and dehumidified; the cooled and dehumidified fresh air and return air are mixed, and three-dimensional spiral vortex mixed airflow is formed; according to the temperature and humidity distribution data of the three-dimensional spiral vortex mixed airflow, a middle surface air cooler and a rear surface air cooler are controlled to conduct secondary cooling and temperature control treatment on the three-dimensional spiral vortex mixed airflow; a high-pressure water mist humidification system is adopted for carrying out humidification treatment on the three-dimensional spiral vortex mixed airflow obtained after secondary cooling and temperature control treatment, moisture filtering is carried out on the humidified three-dimensional spiral vortex mixed airflow through a honeycomb-shaped water curtain, and supplied air obtained after moisture filtering is input into a target workshop through a draught fan. The technical problems that an existing system usually adopts a simple steam humidification or wet film humidification mode, the response speed is low, the adjusting precision is low, and the requirement for dynamic humidity change in the complex environment is difficult to meet are solved.

The invention relates to the technical field of laboratory temperature and humidity control. The laboratory temperature and humidity control system comprises a control terminal, a monitoring module, a dynamic prediction analysis module and a partition adjustment module, the monitoring module comprises a temperature sensor arranged on the surface of a wall and equipment, a humidity sensor arranged in a ventilation pipeline, dew point detection units of a fresh air inlet and a return air inlet, a pressure sensor below the ground and a top infrared thermal imaging unit. The dynamic prediction analysis module is used for receiving the equipment calorific value and personnel density information monitored by the monitoring module and outputting a temperature and humidity change trend; the partition adjusting module comprises a temperature control plate array, an air conditioning unit and a humidity adjusting unit, a temperature control plate switches a heat storage / release state through current pulse, and the humidity adjusting unit is used for dehumidification or humidification; the control terminal regulates and controls the partition module according to the prediction result, and intelligent regulation of laboratory temperature and humidity is achieved.

The invention discloses a data center dynamic air-conditioning load rapid calculation method, which comprises the following steps of: 1, summarizing data center cold load influence factors as an input condition of a calculation model; 2, constructing a standardized data center reference model based on building energy consumption simulation software; 3, based on the building geometrical characteristics and thermal performance of the target data center, correcting the enclosing structure load of the reference model by adopting an area correction method, and constructing an enclosing structure load rapid calculation model; 4, automatically resetting an internal heat source load calculation result, and constructing an internal heat source load rapid calculation model; 5, correcting the fresh air load of the reference model by adopting a volume correction method based on the geometric characteristics of the target data center building, and constructing a fresh air load rapid calculation model; and step 6, forming a target data center dynamic air-conditioning load rapid calculation method, and obtaining a hourly cooling load prediction result required for covering the whole year or a design stage.

The invention discloses a fresh air system energy-saving regulation and control method based on communication base station load linkage. The method comprises the steps that load parameters and indoor and outdoor environment parameters of a communication base station are obtained in real time; based on the load parameters and the indoor and outdoor environment parameters, a target operation mode of the fresh air system is determined through a preset parameter threshold value; according to the target operation mode, the target air volume is calculated based on the load parameters and the indoor and outdoor environment parameters; based on the target air volume, control operation parameters of the fresh air system are generated; and in the operation process of the fresh air system, operation data of the fresh air system are recorded in real time, and the target air volume is subjected to self-adaptive dynamic adjustment according to the operation data of the fresh air system. According to the method, the energy-saving effect and the operation stability of the fresh air system can be improved by realizing multi-dimensional cooperative regulation and control based on the base station load and the environment parameters.

The utility model provides a cooking utensil which comprises a body, a heating assembly and a fan assembly, the body is provided with a heat dissipation cavity and a cooking cavity, the heat dissipation cavity is communicated with the cooking cavity, the heating assembly and the fan assembly are connected with the body, the heating assembly is used for heating food materials in the cooking cavity, and at least one part of the fan assembly is located in the heat dissipation cavity. The other part of the fan assembly is located in the cooking cavity, and the fan assembly can blow air in the heat dissipation cavity into the cooking cavity. External fresh air can flow into the cooking cavity through the heat dissipation cavity, so that the cooking cavity can continuously introduce external air in the working process. Therefore, cooking parameters such as humidity and oxygen content in the cooking cavity are adjusted by means of the external air so as to meet the cooking requirements of specific food, and the technical defects that in the prior art, the cooking parameters such as humidity and oxygen content cannot be adjusted, the food cooking requirements cannot be met, and the quality of finished food is poor are overcome.

The utility model provides a continuous gas pressurization sampling device which comprises a gas extraction passage and a sampling passage, a gas extraction pump is arranged on the gas extraction passage, a sampling pump is arranged on the sampling passage, and the two passages are both connected to a gas supply end. The sucking pump is kept to be started when the sampling device is in a working state, and the sampling pump is started when the sampling instrument samples. According to the scheme, a double-air-pump structure is adopted, it can be ensured that external fresh air is stably supplied to the sampling instrument in real time, the gas purity is not affected even if the length of the air inlet pipeline reaches hundreds of meters, and the air inlet pipeline is particularly suitable for being used in stations such as an automatic environment air monitoring station. According to the sampling device in the scheme, when the sampling device is in a normal operation state, the sucking pump is kept to be started, the sampling pump does not need to be started, and the sampling pump is started only when a sampling instrument needs to sample, so that the service life of the sampling pump is not influenced.

The utility model discloses a drying tunnel curing system for composite paper, which is used for jet drying of the composite paper in a drying tunnel and comprises at least four drying ovens sequentially connected along a production line, and all the drying ovens form the drying tunnel for jet drying of the composite paper. An air inlet and an air outlet are respectively formed in two sides of the upper part of each drying oven; a plurality of nozzles for jetting and impacting hot air on the composite paper coating are uniformly arranged in the upper space of the drying oven between the air inlet and the air outlet; an air outlet is further formed in the lower space of the drying oven; a fan, a heating box and a heat exchanger are arranged beside each drying oven, an air outlet of each drying oven returns air to the heating box through an air return pipe, the fan is connected to one side of the heating box, and the output end of the fan is communicated with the air inlet of the drying oven through an air inlet pipe; the other side of the heating box communicates with a heat exchanger through a pipeline, and the heat exchanger is connected with a fresh air inlet pipe, a first air exhaust connecting pipe communicating with an air exhaust opening of the drying box and a second air exhaust connecting pipe for sending out air in the first air exhaust connecting pipe.

The invention relates to a variable dew point control method of an all-air air conditioning system, belongs to the technical field of heating ventilation air conditioners, and solves the technical problems of temperature and humidity coupling in the prior art and difficulty in landing of a chilled water temperature resetting technology. The control method comprises the steps of S1, parameter initialization, S2, system starting and stabilizing, S3, air supply dew point dynamic adjustment and cold water valve control, S4, temperature and air supply amount control and S5, fresh air optimization and air valve control. The water supply temperature is adjusted by dynamically adjusting the air supply dew point and dynamically increasing the temperature of the outlet of the surface air cooler, the energy efficiency of the unit is remarkably improved, and the system is suitable for the chilled water temperature resetting technology and compatible with the application of the medium-temperature water supply technology.

The invention relates to a motor vehicle (10) with an internal combustion engine and / or an electric drive, the motor vehicle (10) comprising: a windshield (12); a water tank (26) arranged in front of the windshield (12), which is designed to collect and drain water accumulating in a transition region (28) between the windshield (12) and a front hood (14); the water tank (26) comprising a base element (30) and a cover element (32) which form an intake chamber (38) for fresh air (FL); a fresh air inlet (40) of an air conditioning unit which is in fluid communication with the intake chamber (38); the cover element (32) comprising a baffle (34) running along the windshield (12) and having a baffle channel (34k) facing the windshield (12) for draining water to both sides of the motor vehicle (10); wherein an intake opening (36) for fresh air (FL) is formed in the cover element (32);and wherein a water collecting basin (42) with a bottom surface (42f) is formed in the floor element (30). The intake opening (36) is formed on both sides of a longitudinal center axis (MA) of the motor vehicle (10) relative to a width direction (Y) of the motor vehicle (10).

The air conditioner comprises a main body part, a fresh air part and an electric control box, the main body part comprises a heat exchange assembly, a fan assembly and an air guide assembly, and the length direction of the main body part is a first direction; the fresh air component and the body component are arranged in the first direction and located at one end of the body component in the length direction. The electric control box is located between the main body component and the fresh air component in the first direction and comprises a box body and a weak current plate arranged in the box body, and at least part of weak current working components in the main body component and at least part of weak current working components in the fresh air component are electrically connected with the weak current plate. The electric control box is arranged between the main body part and the fresh air part, the main body part, the electric control box and the fresh air part are arranged in the first direction, the electric control box is electrically connected with the main body part and the fresh air part conveniently, the wiring distance between the electric control box and the main body part and the wiring distance between the electric control box and the fresh air part are short, wiring is simple, occupied space is small, and arrangement is convenient; and the miniaturization design of the air conditioner can be realized.

The invention discloses a method for improving the internal thermal environment of an air film, and the method comprises the steps: measuring the internal dimensions of an air film retaining wall and an air film material shed, selecting a severe stockpiling heating region in an operation region as a treatment region, selecting an air film retaining wall region as an attachment jet flow air supply unit installation position, constructing a middle air supply unit, and constructing a first air port structure. And air port configuration is conducted, the air speed and flow guide of the first air port structure are set, then the middle air supply unit is arranged, and the attached jet flow air supply unit is constructed. By means of the arrangement mode that the middle air supply unit and the attached jet flow air supply unit are matched, the attached jet flow air supply unit forms an air lake through the coanda effect, the middle air supply unit adopts a double air supply mode, and fresh air can be accurately conveyed to the operation areas on the two sides and the middle core area; the short-circuit effect and the top-layer heat island phenomenon of traditional ventilation are broken through, heat accumulation is prevented, the indoor temperature is remarkably reduced, and the overall thermal environment is improved.

The utility model particularly relates to an automatic air interchanger for an indoor suite door of a passive building. The automatic air interchanger solves the problem that people having a rest are lack of oxygen or dizzy and lack of strength due to the fact that the concentration of indoor CO2 and PM2.5 cannot be detected in time during night rest of an existing passive building. A lock is arranged on the suite door, an outer ventilation opening is formed in an outer side plate at the top of the door pocket line, an inner ventilation opening located on the inner side of the suite door is formed in a top plate of the door pocket line, an air duct communicated with the outer ventilation opening and the inner ventilation opening is arranged between the outer ventilation opening and the inner ventilation opening, and a power transmission mechanism and a rotary ventilation mechanism are arranged in the door pocket line. Automatic ventilation of the public area and the indoor room is achieved, the CO2 concentration and the PM2.5 concentration in the room are equivalent to those in the public area, the CO2 and PM2.5 concentration detecting instrument installed in the public area can detect the concentration of harmful gas in the closed room in time, the fresh air system is started in time to convey fresh air into the room, the air cleanliness in each independent room is improved, and the indoor environment is protected. And the comfort level of the living environment is further improved.

The invention relates to the technical field of environment control, in particular to a cold and heat source environment control method and device with an air purification function, and the method comprises the steps: collecting various parameters through a sensor network, and carrying out the data fusion based on a decision rule base to select a dominant working mode; corresponding air treatment operation is executed, and a composite energy-saving strategy including precooling optimization and phase change latent heat assistance is triggered under the refrigeration working condition; fuzzy control and machine learning are applied to optimize system output and predict load, and a decision rule base and algorithm parameters are updated through self-learning; air supply and exhaust power is controlled to maintain the negative pressure gradient of the key area, and an air path distribution mechanism is adjusted to organize a one-way air flow line; the device comprises an intelligent control module, a sensor group, a fresh air module, a purification module, a cold and heat source module, a bypass pipeline and an air path distribution mechanism. The problems that an existing system is poor in function collaboration, low in energy efficiency and unreasonable in airflow organization are solved, and intelligent decision making, deep energy saving and accurate environment control are achieved.

The utility model discloses a fresh air device with a filtering and humidifying structure, which comprises a shell, the shell is of a hollow square structure, a first partition plate is arranged in the shell, the first partition plate is of a T-shaped structure, the T-shaped first partition plate is fixed on the inner wall of one side of the shell, a second partition plate is fixed on the inner wall of the other side of the shell, and the second partition plate is fixed on the inner wall of the other side of the shell. The first partition plate is of a Z-shaped structure, the second partition plate is of a Z-shaped structure, the interior of the shell is divided into different cavities by the first partition plate and the second partition plate, an indoor exhaust pipe is arranged on the surface of the shell in a penetrating mode, and an indoor air suction pipe is arranged on the surface of the same side of the shell in a penetrating mode. The filter screen at the indoor exhaust pipe is arranged in a sliding mode, and the inner wall of the indoor exhaust pipe is provided with the sliding block and the spring which are in contact with the filter screen, so that the filter screen at the indoor exhaust pipe can be ejected outwards, and the filter screen is convenient to clean and replace.

The invention belongs to the technical field of building ventilation, and particularly discloses an intelligent building ventilation energy-saving system based on AI dynamic adjustment, and the system is characterized in that the system comprises a sensing layer which is used for collecting indoor and outdoor environment parameters in real time; the data transmission layer transmits various data acquired by the sensing layer to a central control system in real time through an Internet of Things communication technology, and is provided with a data caching mechanism; the central control system comprises a data processing module and is used for preprocessing the received data; the AI analysis module is used for establishing an indoor air quality prediction model, a personnel activity mode prediction model and a ventilation system energy consumption model by applying a machine learning algorithm; the control decision module generates an optimal ventilation control strategy; and the execution layer comprises a fresh air fan and an exhaust fan which adopt a frequency conversion technology, and an air supply outlet and an exhaust outlet which are provided with electric air valves, and further comprises a function of receiving a control instruction of the central control system and controlling ventilation equipment in real time.

The application relates to a pharmaceutical production clean workshop, and relates to the technical field of pharmaceutical production workshops.The pharmaceutical production clean workshop comprises a workshop, a fresh air filtering device, a return air filtering device, a fresh air-return air mixing device and a secondary filtering device arranged in the workshop, the return air filtering device comprises filtering components, adsorption components and disinfection components connected in sequence; the fresh air filtering device performs preliminary purification on fresh air; the return air filtering device removes larger particulate matters in return air through the filtering components, further adsorbs small impurities through the adsorption components, and disinfects and sterilizes the gas through the disinfection components; the fresh air-return air mixing device mixes the processed air, the secondary filtering device performs secondary filtration on the mixed air, and the air quality entering the workshop is ensured. Through the synergistic effect of the components, efficient filtration, adsorption and disinfection treatment of fresh air and return air in the workshop are realized, and the air quality and cleanliness in the workshop are effectively improved.

The present invention discloses a closed-loop EGR flow control system and control method for a natural gas engine. The control system includes: a controller for determining an EGR demand flow rate based on actual engine operating conditions; a controller for obtaining the pressure of an air and gas mixture detected by an intake pressure sensor; or, alternatively, for determining the pressure of an air and gas mixture based on the EGR demand flow rate, a threshold flow rate, the maximum opening of an EGR valve, the actual opening of the EGR valve, the gas flow rate, and the fresh air flow rate; a controller for determining an actual EGR flow rate based on the obtained pressure of the air and gas mixture, the partial pressure of gases in the cylinder, the pressure-to-flow conversion slope, the gas flow rate, and the fresh air flow rate; a controller for determining an EGR flow rate correction value based on the obtained actual EGR flow rate and the EGR demand flow rate; and a controller for adjusting the EGR valve opening based on the EGR flow rate correction value so that the actual EGR flow rate matches the EGR demand flow rate, thereby achieving closed-loop control of the EGR flow rate. The present invention can achieve precise control of the EGR flow rate in two ways.

The invention provides a control method and device for a fresh air system of a clean room, a medium and a computer program, and relates to the technical field of clean room ventilation control. The method comprises the steps that a system collects air quality data of different detection points of a clean room in real time, and an original data sequence is generated; key feature data is extracted from the original data sequence, and dimensionality reduction is performed on the key feature data by using PCA to form a dimensionality reduction feature matrix; respectively inputting the dimension reduction feature matrix into ARIMA and LSTM to obtain prediction results, and performing weighted fusion to obtain a fusion prediction result of the air quality; and based on the fusion prediction result and the detection point position, marking a potential pollution source position, obtaining a diffusion path simulation result according to the diffusion model, and based on the fusion prediction result, the potential pollution source position and the diffusion path simulation result, generating a real-time dynamic control strategy to control the operation state of the fresh air system. Efficient and energy-saving operation can be achieved while it is ensured that the air quality reaches the standard.

The utility model relates to the technical field of fresh air settling treatment, in particular to a fresh air settling chamber for a clean room, which comprises a settling chamber main body, a partition plate is arranged in the settling chamber main body, a collecting structure is arranged on one side of the partition plate, and side plates are mounted on two sides of the inner wall of the settling chamber main body; through the collecting structure, when air is treated, air in the clean room is introduced into the air inlet pipe, at the moment, after the air is pretreated through the air inlet structure, the air enters the space between the side plates on the two sides, large dust particles in the air fall down under the influence of the gravity of the dust particles and are stuck and fixed by the sticking belt below, and dust is prevented from being blown by wind to fly around; when the adhesive tape on one side is fully paved with dust particles, the output shaft of the adhesive tape can drive the rotating rod to rotate through driving of the servo motor, so that one side of the collecting roller is replaced, and when the adhesive tapes on the four sides are fully paved with dust, the cover plate is taken down, and the adhesive tapes are torn down one by one and replaced. Therefore, the purposes of collecting dust and preventing dust particles from returning to the air chamber are achieved.