4111 results about "Smoke" patented technology

Electric heat for generating smoke from tobacco or the like in a hookah type smoking pipe. Electric heat is obtained from an electrically powered heating element which may be placed proximate the tobacco. The heating element may be contained within a housing which in turn may be placed above the smoking chamber of the hookah. The housing may have adjustably damped holes disposed to pass air over the heating element. Electrical circuitry serving the heating element may comprise a step down transformer and a voltage adjusting switch. The heating element may be integral with the hookah, may take the form of a separate component which is mountable over the smoking chamber of the hookah, or may comprise a free standing assembly which may be placed to stand adjacent to the hookah.

The invention relates to the technical field of fire safety monitoring, in particular to a firework identification system and method based on multi-modal fusion perception, and the core of the scheme is a visible light, multispectral and temperature three-modal framework: feature extraction optimization of each modal, improved YOLOv8s for visible light branches, dynamic background modeling and flame color screening, and multi-modal fusion perception. False positive is rejected by a multispectral branch depending on a waveband ratio and an index, an error compensation algorithm is introduced into a thermopile branch, and finally, a final smoke and fire area and the confidence coefficient thereof are determined by associating a three-mode area through collaborative decision. According to the scheme, the complex environment adaptability and the recognition reliability can be improved, the false alarm risk is reduced, the extremely-early smoke and fire detection capability is enhanced, good real-time performance and deployment flexibility are achieved, and the method is suitable for various types of fire safety monitoring scenes.

The invention provides an external smoke exhaust system of a laser cutting machine and a working method, relates to the field of laser cutting machines, and aims to solve the problems that smoke leakage of an existing laser cutting machine affects operation of a laser element. Air flow output by the air feeder can cover a smoke dust area where the laser head works, scattered smoke dust is blown to the inlet end of the smoke collecting hood in an oriented mode, disordered diffusion of the smoke dust is avoided, the smoke dust and high-temperature chippings are guided to the smoke collecting hood in the horizontal direction in an oriented mode through the horizontal air flow output by the air feeder instead of being guided upwards, and the smoke discharging path is in the horizontal direction. Smoke dust and high-temperature chippings are prevented from floating upwards to the laser element area of the cutting head, the possibility of contact between the high-temperature chippings and the laser element is cut off from the smoke exhaust path, and normal operation of the laser element is protected.

The invention discloses an HRR-based acoustic fire hazard type identification method, device and equipment and a medium, and relates to the technical field of fire hazard detection, and the method comprises the steps: obtaining an original acoustic signal through transmitting a high-frequency modulation ultrasonic wave and receiving a flame region reflection echo, obtaining channel impulse response data through channel estimation, and carrying out the channel impulse response data; flame features are extracted, a heat release rate curve is calculated and generated, finally fire type identification and fire behavior stage determination are completed based on the curve, dense smoke, shielding and illumination interference can be resisted, accurate quantification of the heat release rate is realized, fire type identification and fire behavior development stage determination can be finely carried out, and the accuracy of fire behavior determination is improved. And a stable and reliable technical support is provided for fire monitoring and emergency decision making.

The invention relates to the technical field of environmental protection, in particular to a spraying dust removal method, equipment and system. The spraying dust removal equipment comprises an outer cylinder and an adjusting mechanism, wherein a smoke inlet is formed in the lower part of the outer cylinder. The adjusting mechanism comprises an adjusting assembly and a plurality of turbulent balls. The adjusting assembly comprises a pull ring, a net bag and a driving unit. The smaller the initial dust air flow entering the smoke inlet is, the larger the upward moving stroke of the pull ring driven by the driving unit is, the upward moving of the pull ring drives the middle of the net bag to be further sunken downwards, the structure is convenient for weak air flow to preferentially pass through the periphery of the net bag with a small number of turbulent balls, effective turbulent washing is formed in the area, and the working efficiency is improved; and the normal operation and the dust removal effect of the equipment under low load are ensured. The invention provides a spraying dust removal method, equipment and a system, aiming at solving the problems that the dust removal efficiency is low and even the dust removal device cannot work when the flow of dust gas introduced into the existing dust removal device does not reach a preset dust gas flow range value.

The invention discloses an intelligent smoke furnace catalysis operation condition suitability grading method. The method comprises the steps that basic parameters of an operation point are obtained; calling a Passive-Toner algorithm to calculate the atmospheric stability grade of the operation point; the continuous cigarette lighting source intensity is calculated according to the used flame bar combustion data; calculating the vertical airflow distribution of the operation point by adopting a Matviyerv vertical velocity theoretical model based on the altitude and vertical airflow observation data of the operation point; based on the continuous cigarette lighting source intensity, calculating the ice nucleus number concentration distribution in the cloud in combination with the vertical airflow distribution and the horizontal wind field; calculating an operation suitability index by adopting a comprehensive index algorithm in combination with the lifting condensation height, the cloud amount and the cloud classification data; and performing grading processing on the job suitability index according to a set threshold value combination so as to output a plurality of job suitability grading results. According to the method, comprehensive analysis is carried out by considering the meteorological condition and the catalytic condition of the operation point, so that the accuracy and the credibility of an operation condition suitability judgment result are improved to a certain extent.

The utility model provides a smoke gathering structure and a range hood, and relates to the technical field of kitchen appliances. The smoke gathering structure mainly comprises a smoke collecting hood, a smoke gathering plate and a driving assembly. A plurality of clamping structures are arranged in the exhaust fume collecting hood; the smoke gathering plate is arranged on one side of the smoke collecting hood and can rotate relative to the smoke collecting hood; the driving assembly comprises a driving motor and a transmission part which are connected. The transmission part is arranged in the exhaust fume collecting hood and is connected with the exhaust fume gathering plate; the driving motor drives the transmission part to move so as to drive the smoke gathering plate to rotate. According to the embodiment provided by the invention, in the stage that the driving motor drives the transmission part to move to drive the smoke gathering plate to rotate, after the transmission part moves to abut against any clamping structure, the driving motor stops and keeps the self-locking state, and the self-locking driving motor, the abutting clamping structure and the transmission part form enough support for the smoke gathering plate; when a user presses the function key, the smoke gathering plate is kept stable, and it is ensured that the user has good operation (touch) experience and visual experience during operation.

The invention relates to the technical field of automobile manufacturing, in particular to a flame-retardant coating detection device and a flame-retardant coating detection method. The flame-retardant coating detection device comprises a baffle plate, a supporting plate, a cover plate and a supporting plate which are enclosed to form a closed test cavity. The baffle is provided with a first mounting hole for fixing a fire source, the supporting plate is provided with a corresponding second mounting hole for fixing a temperature detection piece, the cover plate is provided with an insertion hole for mounting a sample, and the supporting plate is provided with a smoke suction assembly. The device is simple in structure and convenient to operate, a fire source and a temperature measuring point can be effectively fixed, the testing efficiency and accuracy are improved, testing is conducted in a closed environment, the smoke suction function is integrated, safe and environment-friendly harmful smoke is guaranteed, the safety and health of operators are comprehensively guaranteed, and environmental pollution is avoided.

The invention provides a tunnel fire monitoring and ventilation and smoke exhaust linkage control system. The tunnel fire monitoring and ventilation and smoke exhaust linkage control system comprises a tunnel environment and fire monitoring module, a data fusion processing module, a tunnel ventilation and smoke exhaust linkage control module and a remote monitoring and control management system module which are connected through a communication network. The data fusion processing module is configured with a D-S evidence theory algorithm and is used for receiving multi-source environment data, calculating basic probability distribution of data of each sensor, quantitatively evaluating a fire occurrence probability through a combination rule and generating a fire state judgment result; the tunnel ventilation and smoke exhaust linkage control module is used for receiving the fire state judgment result and determining the target wind speed according to the fire scale; a fuzzy PID control unit and a hysteresis control unit are arranged in the tunnel ventilation and smoke exhaust linkage control module. According to the method, the problem of high false alarm rate of traditional monitoring is solved, the engineering problem that discrete ventilation equipment is difficult to continuously and accurately control is solved, and the disaster prevention and reduction capability of the tunnel is remarkably improved.

The invention discloses a tobacco peculiar smell treatment system for cigarette production based on spraying pressure regulation, and relates to the technical field of waste gas treatment equipment.The treatment system comprises a base, a control box, a photocatalytic oxidation chamber, a spraying mechanism, a smoke exhaust pipe and an exhaust pipe, and the control box, the photocatalytic oxidation chamber and the spraying mechanism are all fixedly connected with the base; the spraying mechanism comprises a tower body, a smoke exhaust port is formed in the tower body, the smoke exhaust pipe is fixedly connected with the smoke exhaust port and the photocatalytic oxidation chamber, the photocatalytic oxidation chamber is fixedly connected with the exhaust pipe, and the control box is connected with the photocatalytic oxidation chamber and the spraying mechanism through electric signals; according to the device, secondary treatment of multi-stage spraying, photo-oxidation catalysis and activated carbon adsorption is combined, harmful substances and peculiar smells in waste gas are thoroughly removed, the waste gas washing effect is improved by changing the stirring and spraying filler frequency and adjusting the spraying cleaning liquid pressure, and the tobacco waste gas treatment effect is greatly improved.

The invention belongs to the technical field of computer vision, embedded edge calculation and intelligent video monitoring, and discloses a yolk-based night smoke and fire identification optimization method, which can effectively detect flames at night or in a scene with disordered light. A multi-source data fusion and lightweight scene segmentation technology is adopted, an on-site perception model is built, and the model is combined with a small sample learning mechanism, so that night common interference factors such as vehicle lamps and street lamps can be identified; then, a federal learning algorithm and a time sequence attention module are used for modeling the dynamic characteristics of the smoke and fire, and an obtained characteristic model has high generalization ability; then, the system accurately screens out real smoke and fire candidate targets through self-adaptive threshold matching and pixel-level interference elimination operation; and finally, based on a multi-factor decision model and a dynamic edge transmission technology, rapid alarm of smoke and fire identification is realized. The whole system can also automatically optimize the whole process parameters of the method through rule mining and reinforcement learning.

The utility model discloses a dust falling device of a coal washer, which relates to the technical field of coal treatment and comprises a device main body, the device main body comprises a detachable structure for maintenance, a filtering box body connected with the device main body, a dust falling box body connected with the filtering box body, a dust collection assembly connected with the dust falling box body, a dust falling assembly connected with the dust collection assembly and a filtering mechanism connected with the filtering box body; the dust suppression device has the advantages that smoke, dust and particulate matter in the device body are detected in real time through the smoke sensor, when it is detected that the concentration of the smoke, the dust and the particulate matter is higher than 3 mg / m < 3 >, a second motor in the dust suppression assembly is started immediately, the second motor drives a second rotating shaft to rotate clockwise from a vertical state to a transverse state, and the dust suppression effect is achieved. The processor starts the high-pressure pump, and the water outlet pipe and the mist nozzle at the bottom of the square water collecting plate suck water in the water tank for dust fall spraying.

The invention relates to the technical field of intelligent control, in particular to a coke pushing process environment dust removal system air volume intelligent energy-saving regulation and control system and method, and the system comprises a process signal module, an image sensing module, a dynamic infrared module, a real-time flue gas analysis module and a dust removal air volume control module. In the invention, the air volume regulation of the dust removal equipment is not a fixed and extensive mode any more, but is converted into a four-gear variable-speed intelligent response matched with the actual smoke dust load, the dust removal equipment runs at a low-energy-consumption gear when the smoke dust generates initial stage or light pollution, and the air volume is gradually increased along with the rising of the smoke dust load, so that the dust removal efficiency is improved. When large-scale smoke dust leakage caused by equipment faults or extreme working conditions is monitored, the highest-gear full-force trapping is immediately started, the treatment effect is ensured, and the regulation and control according to needs not only improves the smoke dust trapping efficiency and effectively restrains unorganized emission, but also reduces the operation energy consumption of a dust removal system, and realizes double improvement of environmental protection benefits and economic benefits.

The invention discloses an aerosol-generating article comprising an aerosol-generating substrate segment, the aerosol-generating substrate segment comprising a plurality of aerosol-generating capsules. According to the aerosol generating product provided by the invention, the aerosol generating capsule with a core-shell structure is used as a fuming material, so that the heating release temperature can be further reduced, and the harm of smoke is reduced.

The invention relates to the technical field of chemical plant smoke filtering, in particular to a chemical plant discharge filtering device with a monitoring function, which comprises a barrel, a gas inlet pipe, a gas outlet pipe and the like, the barrel is communicated with the gas inlet pipe, and the top of the barrel is communicated with the gas outlet pipe. Indexes of pollutants such as sulfur dioxide, nitric oxide, carbon monoxide and carbon dioxide in flue gas can be detected through the flue gas sensor, when the flue gas sensor detects that the pollutants in the flue gas exceed the standard, the controller can control an electric guide rail to work, the electric guide rail drives a first push plate to move forwards, and a first sealing plate can also move forwards; the first sealing plate seals the exhaust pipe, real-time response can be achieved after the filter element is aged and breaks down, the filter element is replaced without shutdown under the condition that it is ensured that smoke does not leak, smoke which is not completely purified is prevented from being exhausted out, and therefore pollution to the environment can be avoided.

The invention discloses an extractor hood and a control method and a control device thereof.The extractor hood comprises at least two independently-lifting smoke gathering cavities, and the control method comprises the steps that a neural network model is adopted, and based on first video information, first image information and oil smoke concentration information of a target cooking area, the first video information and the first image information are obtained; determining cookware size information, cookware type information, cooking temperature information, concentration standard exceeding information and cooking fume movement information; the lampblack movement information comprises lampblack speed information and lampblack direction information; according to the pot type information, the cooking temperature information, the concentration standard exceeding information and the oil smoke speed information, the suction demand level of the target cooking area is determined; according to the suction demand level and the cookware size information, the target height of a smoke gathering cavity corresponding to the target cooking area is determined, and the smoke gathering cavity is controlled to descend to the target height from the initial position. According to the technical scheme, the oil smoke suction efficiency of the range hood in a complex cooking scene can be improved, and the use experience of a user is improved.

The invention belongs to the technical field of kitchen appliances, and discloses a hidden range hood which comprises a case, a smoke gathering shell, a driving mechanism and a smoke gathering plate. The smoke gathering shell is slidably connected to the machine box and provided with a smoke sucking opening. The driving mechanism is connected with the smoke gathering shell; the smoke gathering plate is arranged at the smoke sucking opening, is in sliding connection with the case and the smoke gathering shell through a connecting assembly and is locked with the case at a first position; wherein the smoke gathering shell has a hidden state and an open state, in the hidden state, the smoke gathering shell and the smoke gathering plate are both located in the machine box, in the open state, the driving mechanism drives the smoke gathering shell and the smoke gathering plate to slide to the first position, and the driving mechanism drives the smoke gathering shell to slide relative to the smoke gathering plate so as to open and adjust the smoke suction opening. The double-lifting function of the smoke gathering shell and the smoke gathering plate can be achieved through one driving mechanism, so that the complexity of a mechanical structure and a control circuit is effectively reduced, the design and manufacturing difficulty of a product is reduced, and meanwhile the overall production cost is reduced.

The invention relates to the technical field of range hoods, in particular to a range hood, and aims to solve the problems that a smoke suction port of an existing range hood is small in lifting adjustment range, the appearance cannot be kept concise in a non-working state, and the smoke gathering effect cannot be effectively improved in a working state. The range hood of the present invention comprises: a main case; a top suction opening is formed in the smoke collecting cavity; a side suction port is formed in the side suction cavity; the smoke gathering plate is used for opening and closing the top suction opening; the lifting driving mechanism is used for driving the side suction cavity to be switched between the state of being stored in the smoke collecting cavity and the state of stretching out of the smoke collecting cavity in the process of synchronously lifting the side suction cavity along with the smoke collecting cavity; in the storage state, the side suction port is closed, and in the extending state, the side suction port is opened; and the smoke gathering plate driving mechanism is used for driving the smoke gathering plate to open and close. According to the range hood disclosed by the invention, the negative pressure coverage range is expanded to improve the smoke gathering effect, and the simplicity of the appearance of the whole range hood and the minimization of the occupied space are realized through precise storage of the parts.

The utility model relates to the technical field of boiler air and smoke, in particular to a tubular heat exchanger and a boiler air and smoke system. Comprising two sets of connecting blocks, an air inlet pipe and a smoke inlet pipe are fixed to the surface of one set of connecting blocks, a smoke outlet pipe and an air outlet pipe are fixed to the surface of the other set of connecting blocks, an inner pipe is arranged on the inner wall of an outer pipe, and a filter plate is arranged on the inner wall of the end, close to the air inlet pipe, of the inner pipe. The spiral drainage blocks play a role in guiding high-temperature air smoke and cold air, the high-temperature air smoke is cooled more evenly, high-efficiency cooling of the high-temperature air smoke is achieved, meanwhile, the reinforcing blocks are fixed to the surfaces of the end openings of the outer pipe and the inner pipe and made of stainless steel, the heat exchange pipe is prevented from being corroded by low temperature, the filter plate is arranged on the air inlet, and therefore the heat exchange effect is improved. The inner pipe is prevented from being blocked by impurities doped in the cold air, so that the energy consumption of the blower is prevented from increasing.

The invention relates to the technical field of air pollution detection, in particular to a flue gas detector and a calibration detection method thereof, and the flue gas detector comprises a concentration fluctuation analysis module, an abnormal data screening module, an error interval collection module, a parameter trend analysis module and a period stability judgment module. According to the method, abnormal data and equipment drift influence are dynamically screened, an error change interval is actively collected, and through linkage comparison of multi-source parameter trends and separation of working condition disturbance, instrument abnormality and periodic offset signals, automatic screening of concentration data and operation parameters under multiple links is achieved, feature recognition and abnormal partition are associated, and the accuracy of the system is improved. The sampling effectiveness, the data stability and the instrument parameter change trend under the continuous detection working condition are managed in a layered mode, a traceable dynamic calibration chain is formed, the smoke detection consistency and the data exception handling capacity in the complex emission environment are remarkably improved, and an intelligent judgment mechanism of data grading rejection and trend aggregation is perfected.

A micro-vibration wave generating device includes: a power indicator circuit, a first transformer micro-vibration wave generating circuit, and a receptor. An input end of the power indicator circuit is connected to the power source; an input end of the first transformer micro-vibration wave generating circuit is connected with an output end of the power indicator circuit; the receptor is connected with an output end of the first transformer micro-vibration wave generating circuit. Micro-vibration waves generated by the transformer micro-vibration wave generating circuit can resonate with the water molecules in the food, and thereby the water molecules form soft and non-spiky crystals of water molecules when they are frozen, which greatly reduces the damage to the food cells. Accordingly, the quality of the food is intact without mixing odors. The present invention can also be used in cooking deep fried food with almost no oil smoke produced.

The invention relates to the technical field of building fire protection, in particular to an intelligent smoke exhaust device based on shape memory alloy and a smoke exhaust method.The intelligent smoke exhaust device comprises a window frame installed on a wall and a grating plate embedded into the window frame, and the grating plate is manufactured by laser etching of a shape memory alloy matrix with a preset crack pattern; and a heat reflection coating is arranged on the surface of the grating plate. When no fire occurs, the grating plate is in a sealed state, and no gap exists; when a fire disaster occurs, the indoor temperature rises rapidly, when the temperature rises to 90 DEG C and reaches the deformation temperature of the memory alloy, deformation begins, cracks are opened after the grating plate deforms, the preset cracks are distributed in a radial mode after being opened, a smoke exhaust channel is generated, and indoor smoke dust is exhausted. The method has the technical effects of high response speed and no need of manual reset.

The invention relates to the technical field of plate hot cutting equipment, and provides a steel plate flame cutting device which comprises a rack, the rack is used for bearing a steel plate, a sliding frame is horizontally arranged on the rack in a sliding mode in the length direction, and a cutting piece is arranged in the extending direction of the sliding frame in a sliding mode; the exhaust housing is arranged on one side of the rack in the width direction, an air inlet of the exhaust housing faces the length middle axis of the rack, and the other side of the exhaust housing is communicated with the outside through an arranged exhaust pipeline. The multiple blocking covers are arranged in the air inlets in a lifting and sliding mode, a pushing part is arranged on the side end face of the sliding frame, and the sliding frame is configured in the mode that after sliding, the pushing part drives one blocking cover which abuts against the sliding frame in a sliding mode to ascend and slide, so that the local air inlets in the corresponding positions are opened. The multiple blocking covers are independently arranged in a lifting mode, so that the air inlet is only opened at the corresponding cutting position, the situation that air in a non-cutting area enters the exhaust housing is reduced, and the concentration ratio and efficiency of smoke collection are improved.

The invention provides a dust removal device and a dust removal system, and relates to the technical field of tobacco equipment, and the dust removal device comprises a shell, an air inlet pipeline, an air outlet pipeline and a material blocking assembly. A blanking hopper is arranged in the shell, the output end of the air inlet pipeline is located above the blanking hopper, the air outlet pipeline is communicated with the end, away from the air inlet pipeline, of the shell, the input end of the air outlet pipeline is located above the output end of the air inlet pipeline, and the first material blocking part is arranged between the output end of the air inlet pipeline and the input end of the air outlet pipeline in a blocking mode. The first material blocking part and the second material blocking part are arranged at an angle, a gap is formed between the first material blocking part and the second material blocking part, and the gap is located on the side, away from the output end of the air inlet pipeline, of the first material blocking part. According to the dust removal device, the situation that dust or smoke dust entering the shell is directly sucked into the air outlet pipeline is avoided, an airflow path enters the air inlet pipeline through the gap position, the purpose of guiding airflow containing dust is achieved, and then the safety of the dust removal device is improved.

The utility model belongs to the field of additive manufacturing, and relates to aeration type smoke dust treatment equipment which comprises a reaction cavity loaded with an inert and aeration equipment extending into the reaction cavity, the interior of the reaction cavity is in a low-oxygen or oxygen-free environment; the reaction cavity is provided with a smoke gas inlet, a smoke gas outlet, a material supplementing opening and a slag discharging opening which are communicated with the reaction cavity; metal smoke dust to be treated enters the reaction cavity through the smoke dust gas inlet and / or the aeration equipment and then directly impacts or is introduced into the inerts to be physically combined with the inerts, and the purified metal smoke dust is discharged through the gas outlet. The utility model provides the aeration type smoke dust treatment equipment which is high in safety degree and easy to operate.

This disclosure relates to a method and system for coordinated control of a range hood and a cooktop. The method includes: acquiring a motion signal corresponding to the valve stem of the cooktop ignition valve and a valve switch signal corresponding to the cooktop ignition valve; performing signal conversion processing on the motion signal to obtain a corresponding linkage indication signal, which is used to drive a state analysis module to perform state analysis processing on the valve switch signal to obtain a cooktop state signal; and controlling the on / off state of the range hood based on the cooktop state signal. This disclosure, by driving the state analysis module through the corresponding linkage indication signal when the cooktop ignition valve stem moves, enables state analysis processing of the valve switch signal to obtain a cooktop state signal when the cooktop heat changes, thus reducing the power consumption of the state analysis module; and by controlling the on / off state of the range hood through the cooktop state signal, it achieves coordinated operation of the cooktop and range hood.

The utility model relates to an electric control cabinet intelligent safety alarm device, which comprises an electric control cabinet main body, an ultrasonic ranging module, an alarm module and a communication module, and is characterized in that the ultrasonic ranging module measures the time difference of transmitting and receiving ultrasonic waves to determine the actual distance between an obstacle and the electric control cabinet main body, so that non-contact ranging is realized; the timeliness of alarm triggering is ensured, and accurate measurement can be carried out even in a severe environment full of dust, smog or corrosive substances and the like; the multi-mode alarm module and the ultrasonic ranging module are combined for use, multi-mode alarm is carried out when the ultrasonic ranging module triggers the alarm function, a multi-level verification and confirmation mechanism is realized, the possibility of false alarm is reduced, diversified alarm signals are provided, and the alarm can be carried out even in a noisy or poor-sight environment. Normal receiving of alarm information can also be ensured; by means of the communication module, the intelligent safety alarm device of the electric control cabinet has remote monitoring and management functions, and the quick response capability is remarkably enhanced.

The invention provides a range hood operation control method and device, a lifting type range hood and electronic equipment, and the method comprises the steps: obtaining a to-be-cooked food material and a user portrait in response to a cooking starting operation; generating a personalized menu based on the to-be-cooked food materials and the user portrait; and generating a control curve of the range hood based on the personalized menu, wherein the control curve comprises a range hood lifting curve and / or a range hood air volume curve. According to the method, the fine-grained user portrait is constructed by collecting the biological characteristics, the dietary habits and the cooking behavior characteristics of the user, and the control curve of the range hood adaptive to the individual preference is generated accordingly, so that the individual suitability and accuracy of the control curve of the range hood are remarkably improved.

The invention discloses an air purification device and a control method, and relates to the field of air purification, and the air purification device comprises a shell, a polarity switching unit, a discharge electrode group and a cleaning electrode group; the discharge electrode group and the cleaning electrode group are both arranged in the shell; the discharge generation end of the discharge electrode group and the discharge generation end of the cleaning electrode group are both close to the airflow direction; the air flow circulates in a space between the discharge electrode group and the cleaning electrode group; the polarity switching unit is respectively connected with the discharge electrode group and the cleaning electrode group; the polarity switching unit is used for controlling the discharge electrode group to apply a first polarity voltage so as to generate a plasma electric field; and the polarity switching unit is also used for controlling the cleaning electrode group to apply reverse polarity voltage so as to generate an electric field for decomposing and stripping surface deposition of the discharge electrode group. The device realizes automatic cleaning and is suitable for heavy oil smoke scenes.

The application discloses an oil fume extractor, which comprises an air inlet assembly and an upper box body, the bottom surface of the upper box body is provided with an air inlet, the air inlet assembly comprises a lower box body and a smoke baffle, the lower box body comprises a back plate connected with the rear side of the upper box body; the air inlet assembly further comprises a first baffle, the first baffle is fixedly arranged at the upper end of the smoke baffle, and the smoke baffle and the first baffle have at least a closed state and an open state; in the closed state, the smoke baffle is close to the back plate, and the first baffle closes the air inlet; in the open state, the first baffle opens the air inlet, and a smoke collecting cavity is formed between the smoke baffle and the back plate. Compared with the prior art, the oil fume extractor has the advantages that: on the premise of ensuring the structural strength, the air inlet channel in the form of a fixed inner cavity is not needed, the oil fume extractor can be made extremely light and thin, the smoke baffle and the first baffle are kept in a fixed state, there is no mutual movement between the sub-components, the related parameter requirements (such as assembly gap) are easy to control, and the overall structure is stable and reliable.