60results about How to "Guarantee the smoke effect" patented technology

The invention provides a method and a system for adjusting constant air volume of a range hood. The system comprises a detection unit for detecting the parameters of a motor in the range hood, an air volume monitoring unit for obtaining the real-time air volume of the exhaust outlet of the range hood according to the parameters of the motor, and a control unit for regulating the parameters of the motor through an inverter so as to keep the real-time air volume constant. The parameters of the motor are obtained and the current air volume value is calculated, and then the monitored real-time air volume is fed back to the control unit so that the control unit is capable of regulating the rotating speed or the current of the motor according to the real-time air volume, and therefore, the purpose of regulating the real-time air volume is achieved and the output air volume is kept constant, and moreover, the oil fume suction effect is guaranteed.

The invention discloses an integrated stove capable of exhausting and sucking smoke with high efficiency, which comprises a stove body. A rear side higher than a table facet is arranged on the stove body, an air suction opening for sucking the smoke is arranged on the rear side towards the direction of a cooking range, the air suction opening is in seal connection with a draught fan through an air guiding pipe, a fan for sending air to the cooking range is arranged, an air outlet opening of the fan is a circular hole and is located above the cooking range on the side away from the air suction opening, and the central direction of positive pressure air flow of the air outlet opening inclines outwards. By the matching of the positive air flow and the air outlet opening in the circular-hole shape, a conical air screen can be formed to cover the smoke above the cooking range, prevent the smoke from dispersing outwards, enable the smoke to enter the air suction opening on the rear side as much as possible and ensure the smoke suction effect. The integrated stove capable of exhausting and sucking the smoke with high efficiency further has the functions of preventing flame from being sucked in, oil collecting box oil quantity alarming, gathering the flame and the like. In addition, fan overhaul is convenient.

The invention discloses an integrated lighting and smoke-absorption knife pen. The integrated lighting and smoke-absorption knife pen is characterized in that a knife pen control circuit is arranged on the upper layer of a knife pen shell, an operation electrode connector is arranged at the front end of the control circuit, and an operation electrode is connected with the control circuit through the operation electrode connector. A light-emitting diode (LED) lamp is arranged at the front end of a knife pen lower outer shell, the tail end of the control circuit is connected with a knife pen insert through a cable, and an electrotome control insert terminal and a light source power supply terminal are arranged at the front end of the knife pen insert. A smoke-absorption pipeline is formed in an inner cavity in the knife pen shell, a smoke-absorption port is formed at the front end of the knife pen outer shell, the tail end of the knife pen is connected with a narrow corrugated pipe in a sleeved mode, the narrow corrugated pipe is connected with a wide corrugated pipe through an adapter, the wide corrugated pipe is connected with a smoke adsorption device or the narrow corrugated pipe is connected with the smoke adsorption device directly through the adapter. The integrated lighting and smoke-absorption knife pen has the functions of lighting and smoke absorption.

The invention discloses a water-cooling inert gas furnace cover. The water-cooling inert gas furnace cover comprises a furnace cover supporting frame, a furnace cover ring and an upper furnace cover hood, wherein the furnace cover ring is fixedly arranged on the furnace cover supporting frame; the upper furnace cover hood is fixedly arranged on the top end of the furnace cover ring and is provided with a main smoke discharge pipeline with a skirt hood branch flue; the bottom of the outer wall of the furnace cover ring is provided with a furnace cover skirt hood I, a furnace cover skirt hood II, a furnace cover skirt hood III, a first-layer flue and a second-layer flue; the first-layer flue is arranged between the furnace cover skirt hood I and the furnace cover skirt hood II, and the second-layer flue is arranged between the furnace cover skirt hood II and the furnace cover skirt hood III; and the first-layer flue is communicated with the interior of the furnace cover ring, the second-layer flue is communicated with the first-layer flue, and the main smoke discharge pipeline and the second-layer flue are communicated through the skirt hood branch flue. The water-cooling inert gas furnace cover provided by the invention has the advantage that smoke in a whole furnace and external air absorbed in the skirt hoods are uniformly pumped.

The invention discloses an electromechanical-control moxa-stick-rotating manual downward feeding device. A supporting hollow rod of the device is fixed on a vehicle frame, a screw rod is sleeved with the supporting hollow rod, and is fixed at the corresponding position in the supporting hollow rod through a lifting fastening bolt, the screw rod is sleeved with a nut, a handle is fixed on the nut, a lifting sliding through hole is formed in one end of a working arm, the working arm is installed on the screw rod through the lifting sliding through hole and located above the nut, a motor is fixed on a working table, a disc is fixed on an output shaft of the motor, a moxa stick is fixed on the clamping disc through a clamper, and a single-chip microcomputer is fixed on the working table and connected with the motor and controls the motor to work. As the moxa stick can be shortened in the burning process, the distance from the moxa stick to acupuncture points is enlarged; according to the electromechanical-control moxa-stick-rotating manual downward feeding device, by rotating the nut, the moxa stick is fed downwards, the distance from the moxa stick to the acupuncture points is kept constant, and the moxibustion effect is guaranteed.

A vertical manual-feeding moxa stick clamping unit comprises a lifting positioning mechanism, an axial feeding mechanism and a moxa stick clamping mechanism. A moxa stick is adjusted to a proper height through the lifting positioning mechanism; with combustion, length of the moxa stick decreases; the moxa stick is fed forward by the axial feeding mechanism; an effective smoking distance between the moxa stick and an acupoint is guaranteed, and smoking effect is ensured accordingly; the moxa stick clamping mechanism is available for clamping moxa sticks in different quantities, and the proper amount is selected for the moxa sticks according to the different smoking conditions. The vertical manual-feeding moxa stick is simple to operate, capable of running stably and compact in structure, and labor intensity can be effectively reduced for moxa stick workers.

The embodiment of the invention discloses a range hood system and an air pressure feedback control method and device thereof. The range hood system comprises a range hood and a fan; the air pressure feedback control method comprises the steps that a target constant air volume value is obtained, and working parameters of a range hood are adjusted to be target working parameters, corresponding to the target constant air volume value, of the range hood; the air pressure of the range hood system is detected; and if the air pressure of the range hood system is larger than the preset air pressure value, the fan is started and adjusted till the air pressure of the range hood system is smaller than or equal to the preset air pressure value. According to the embodiment of the range hood system, the working parameters of the range hood are adjusted into the target working parameters corresponding to the target constant air volume value, so that the constant effective air volume is output; and if the air pressure of the range hood system is larger than the preset air pressure value, the fan is started and adjusted till the air pressure of the range hood system is smaller than or equal to the preset air pressure value, and the effective air pressure constantly lower than the preset air pressure value is output.

The invention discloses a device for electromechanically controlling vertical moving of a moxa stick. The device comprises a rack, a working table, a sliding groove, a clamping disc and a driving device; the working table is arranged on the rack through a lifting rod; the sliding groove is formed in the working table; the clamping disc is arranged in the sliding groove through a sliding block in a sliding mode, and the moxa stick is tightly fixed on the clamping disc through a clamping assembly; the driving device is connected with the sliding block through a crank mechanism to drive the clamping disc to slide up and down along the sliding groove. According to the device, the defects that occupational disease is prone to occurring on an operator due to manual moxa stick fumigating can be overcome.

The invention discloses an adjusting method and device for a range hood. The range hood comprises a fan. The adjusting method comprises the steps that operation parameters of the fan are collected, and an air volume actual value of the fan, an air pressure actual value of the fan and pressure of a public flue are obtained through calculation; a target air pressure interval where the air pressure actual value of the fan is located and an air volume set value corresponding to the target air pressure interval are determined, and if the air volume actual value of the fan exceeds a set range of the air volume set value, the air volume set value is determined as a target air volume set value; and according to the air volume actual value of the fan and the target air volume set value, target adjusting parameters of the fan are obtained through calculation, and the fan is adjusted. According to the adjusting method and device for the range hood, parameters of the range hood are controlled and adjusted through feedback sensing of the operation parameter of the fan to achieve stage air volume control, and for a range hood under a poor working condition, enough rotating speed can be output, so that it is guaranteed that the effective air volume is not reduced; and for a range hood under a good working condition, the rotating speed can be reduced, so that noise is reduced while the fume suction effect is guaranteed, the user experience is improved, and staged constant air volume is realized.

The invention discloses an air outlet housing of a range hood. The air outlet housing comprises a housing body and a valve block assembly arranged at an air outlet of the housing body, wherein the valve block assembly comprises a rotary shaft which is arranged along the symmetry axis of the air outlet and two symmetrical valve blocks which are hinged on the rotary shaft; the gross area of the two valve blocks is matched with the area of the air outlet, and the valve blocks can rotate around the rotary shaft to open or close the air outlet; the air outlet housing is characterized in that a linking assembly for synchronously linking the two valve blocks is arranged below the valve block assembly. The air outlet housing of the range hood not only can effectively prevent a problem that the valve blocks cannot be completely opened or simultaneously opened due to oil-flume adhesion, but also can enable the valve blocks on the air outlet housing to simultaneously open or close, thereby ensuring an oil fume suction effect of the range hood and reducing the noise of the range hood.

The invention discloses a method, device and equipment for detecting and controlling wind pressure of a range hood and a storage medium. The method for detecting and controlling the wind pressure of the range hood comprises the following steps that a first wind pressure value sensed by a first wind pressure detection module arranged at an air inlet of the range hood and a second wind pressure value sensed by a second wind pressure detection module arranged at an air outlet of the range hood are acquired when a motor is started; a current wind pressure reference value is calculated according tothe first wind pressure value and the second wind pressure value; a real-time first wind pressure value sensed by the first wind pressure detection module and a real-time second wind pressure value sensed by the second wind pressure detection module are acquired; according to the real-time first air pressure value, the real-time second air pressure value and the current air pressure reference value, the air volume change trend of the range hood is determined; according to the air volume change trend of the range hood, the air volume of the range hood is controlled; by updating the wind pressure reference value at each motor startup, the running status of a whole flue system and a wind cabinet system of the current range hood is reflected, the influence of system errors is eliminated, misjudgment is avoided, and the accuracy of wind pressure detection is improved.

The invention provides a laser cutting head and a laser embroidery all-in-one machine using same, comprising a main body which is a hollow cylinder, a bright dipping nozzle which is combined and linked at one end of the cylinder and a cover body which is in hollow structure and is combined and linked on the bright dipping nozzle; wherein the cover body further comprises a first part which is difficult to deform and a deformable second part, the first part is a cavity with the lower end opened, the upper end of the cavity is connected with the bright dipping nozzle, and the lower end of the cavity is combined and linked with the deformable second part. When the cutting head is far way from the edge of an embroidery frame, smoke is concentrated between material to be process and the cover body to the utmost extent as the distance between the bottom surface of the deformable second part and the top surface of a work bench is less, so that smoke exhaust effect is better. When the cutting head runs into the edge of the embroidery frame, the deformable second part deforms, thus avoiding that the cutting head is damaged while moving of the embroidery frame is not influenced.

The invention provides a control method for a range hood with a drainage function and the range hood, and relates to the technical field of kitchen electrical appliances. The range hood comprises a processor and a housing assembly with a fume collecting cavity formed therein, and further comprises a detecting assembly, wherein the housing assembly is provided with a primary fume inlet, an auxiliary fume inlet and a fume outlet; a primary fan is mounted in the fume collecting cavity; an air outlet of the primary fan communicates with the fume outlet; the housing assembly is equipped with a drainage device for driving external fume to enter a volute casing of the primary fan through the auxiliary fume inlet; the detecting assembly is used for detecting a factor which can reflect amount of external fume; and the detecting assembly, the primary fan and the drainage device are connected to a processor. The control method is used for controlling use of the range hood. The control method canintelligently regulate fume suction amount according to the size of the oily fume amount, is good in fume sucking effect, and is less in fume escape phenomena.

The invention belongs to the technical field of central flue systems, and discloses a central flue air volume control method and system. The method comprises the following steps that an indoor range hood is started, and whether smoke escapes from the indoor range hood in real time or not is detected; if not, the indoor range hood reduces the air volume until the indoor range hood keeps the minimumair volume without smoke leakage; otherwise, the indoor range hood increases the air volume, and reports the smoke leakage information to an outdoor control system; and after the smoke leakage information is received by the outdoor control system, the outdoor control system controls an outdoor main fan to be started and enables the outdoor main fan to run at a certain gear, so that the indoor range hood with the information reported has no smoke leakage and the indoor range hoods without information reported to further reduce the air volume until the indoor range hoods without information reported keeps the minimum air volume without smoke leakage. With the control method, reasonable distribution of power can be implemented, the practicability of the whole central flue air volume controlsystem is improved, and noise and energy consumption are reduced as much as possible while the smoke suction effect of the indoor range hoods of all floors is guaranteed.

The invention belongs to the technical field of central flue systems, and discloses a central flue air volume control method and system. The method comprises the steps that indoor range hoods are started, electric check valves are synchronously opened to a preset angle, and whether smoke leaks from the indoor range hoods or not is detected in real time; if the smoke does not leak, the opening angles of the electric check valves are reduced until the minimum angle at which corresponding indoor range hoods are free of smoke leakage is reached; otherwise, the opening angles of the electric checkvalves are increased and the electric check valves are reported to an outdoor control system; after the outdoor control system receives smoke leakage information, an outdoor main fan is controlled tobe started, the outdoor main fan is made to operate at a certain gear, and the indoor range hoods corresponding to the reported electric check valves are made to be free of smoke leakage; and the opening angles of electric check valves which are not reported are further reduced until the minimum angle at which the corresponding indoor range hoods are free of smoke leakage is reached. By means of the control method, air volume distribution of all floors can be achieved according to the actual situation.

The invention discloses a filter screen of the range hood. The filter screen comprises a mounting disc, a rim and a quality of blades; the mounting disc is suitable for being mounted on an output shaft of a motor; the rim is arranged around the mounting disc; and a quality of the blades are arranged between the mounting disc and the rim in a radial manner by taking the center of the mounting discas a circle center, the root part of the blade is arranged on the mounting disc, the end part of the blade is mounted on the rim, at least one blade and the projection of the root of the adjacent blade on the outer peripheral wall of the mounting disc are arranged at intervals in the axial direction of the mounting disc, or the projection of the end part on the outer peripheral wall of the mounting disc is separated from the axial direction of the mounting disc. The total area of the blades can be increased as much as possible, then the contact area between the oil fume and the filter screen is increased, therefore, the oil smoke can be filtered as much as possible, the range hood can be reduced to enter the range hood, when the motor is driven by the motor to rotate, the function of air supply and pressurization is achieved, and the oil fume suction effect can be ensured.

The invention discloses an integrated cooker with smoke backflow protection devices and a manufacturing method thereof. The integrated cooker comprises a machine body, a side plate and a smoke barrier, the side plate is provided with air suction openings, baffle assemblies are arranged on the two sides of the side plate, the air suction openings comprise a first air suction opening and a second air suction opening, a filter assembly is arranged on each of the first air suction opening and the second air suction opening, and the smoke backflow prevention devices are arranged in a first smoke guide cavity and a second smoke guide cavity separately. The manufacturing method comprises the following steps of (1) manufacturing the machine body and the side plate; (2) manufacturing the smoke backflow prevention devices; (3) manufacturing the filter assemblies; (4) manufacturing the baffle assemblies; and (5) combined assembling the integrated cooker. According to the integrated cooker and themanufacturing method thereof, the overall structural design is ingenious and reasonable, through the smoke backflow prevention devices, the backflow of smoke in flue can be effectively prevented whenthe integrated cooker is not used, the baffle assemblies are designed on the two sides of the side plate, so that the smoke can be prevented from leaking from the two sides of the integrated cooker,the smoke suction rate of the integrated cooker is further increased, and therefore the operating environment of a kitchen is better.

The invention relates to a portable manual feeding moxa stick-holding device. The lower end of the supporting hollow rod of the holding device is fixed on one end of a machine frame; a screw rod is embedded in the supporting hollow rod; a screw hole is arranged on the supporting hollow rod, and a lifting fastening-screw is arranged in the screw hole; a nut is arranged on the screw rod to form a screw-nut pair; a handle is fixed on the nut; a first through hole is arranged in an end of a work arm, and a second through hole is arranged in the other end of the work arm. The upper end of the screw rod passes through the first through hole; the work arm is above the nut; the moxa stick is arranged in the second through hole, and is fixed by a first moxa stick fastening screw and a second moxa stick fastening screw; the two moxa stick fastening screws are arranged on the wall of the second through hole. The portable manual feeding moxa stick-holding device is novel in conception, compact in structure, relatively simple for manufacturing, safe in operation and good in function, unlike pure hand work, the device can not only greatly decrease labor intensity of patients, but also can prevent smoky effect from human factors, which can maximize the health care effect of smoking of the moxa stick.

The invention relates to a fan. The fan comprises an outer shell, a motor and an oil filter screen. The motor is arranged in the outer shell, the outer shell is provided with an air inlet, and the oilfilter screen is arranged on the air inlet. The fan further comprises a cleaning brush and a clutch mechanism, the cleaning brush is rotatably arranged on the outer surface of the oil filter screen,and the clutch mechanism is disposed in the outer shell and used for driving the cleaning brush to be connected with or disconnected from an output shaft of the motor. The cleaning brush of the fan isselectively connected to the output shaft of the self-contained motor of the fan through the clutch mechanism, when an extractor hood is in a state of absorbing cooking fumes, the cleaning brush canbe disconnected from the output shaft of the motor through the clutch mechanism, so that the cleaning brush is static relative to the oil filter screen, and the effect of absorbing the cooking fumes is not affected; when absorption of the cooking fumes is completed and the extractor hood is switched to a self-cleaning state, the cleaning brush can be connected to the output shaft of the motor through the clutch mechanism, and the fan is started to enable the cleaning brush to rotate relative to the oil filter screen, so that oil stains on the oil filter screen are scraped off, and the filter screen is kept clean; and the extractor hood has a better self-cleaning effect.

The invention discloses a range hood capable of being adjusted to rise and fall according to statures of people. The range hood comprises a body, an infrared face scanning device, a switch, hand-operated adjustment keys, a panel, a suction port and an electric push rod. The electric push rod is installed in the body. The panel is installed at the lower end of the front face of the body. The suction port is formed in the middle of the lower portion of the body. The infrared face scanning device, the switch and the hand-operated adjustment keys are all installed on the panel. The infrared face scanning device is connected with a PLC control circuit. The statures of people cooking meals are sensed by conducting face recognition through the infrared face scanning device, the range hood is automatically adjusted to the height the same as the statures through the electric push rod for different people, the cooking fume suction efficiency can be improved, the cooking fume suction efficiency can be ensured to the maximum extent, time saving and high efficiency are achieved, the trouble that the heads of people are likely to collide with the range hood is eliminated, user friendliness and intellectualization of the machine can be embodied, and the range hood can be conveniently used by users.

The invention discloses a series-connection dual-fan-type range hood. A primary fan and a secondary fan which are connected in series are installed inside a fan frame, a first detection device used for detecting the flow of the primary fan and a second detection device used for detecting the flow of the secondary fan are further arranged in the fan frame, the signal output end of the first detection device and the signal output end of the second detection device are electrically connected with the signal input end of a controller, and the signal output end of the controller is electrically connected with fan motor driving modules of the primary fan and the secondary fan. The invention further discloses a flow control method of the range hood. The controller of the series-connection dual-fan-type range hood can obtain the flow difference value of the primary and secondary two-stage fans according to output signals detected by the first detection device and the second detection device, and correspondingly adjust the rotating speeds of the primary fan and the secondary fan, so that the flow of the primary fan and the flow of the secondary fan are in dynamic balance in the design valuerange under different working conditions, and the oil fume suction effect of the range hood under different working conditions is ensured.

The invention discloses a double opening and closing range hood, and particularly relates to the technical field of range hoods. The double opening and closing range hood comprises a main machine, wherein the top end of the main machine is connected with a smoke exhaust pipe; a fan is arranged in the main machine; and a panel is arranged on one side of the main machine. The double opening and closing range hood is characterized in that an upper smoke inlet and a lower smoke inlet are formed in the panel; the upper smoke inlet is provided with an upper baffle for controlling the opening and closing of the upper smoke inlet; the lower smoke inlet is provided with a lower baffle for controlling the opening and closing of the lower smoke inlet; the upper baffle is open towards the outer side of the main machine; the lower baffle is open towards the inner side of the main machine; the upper baffle and the lower baffle are rectangular and are arranged in parallel; the upper baffle plate andthe lower baffle plate are each connected with a driving mechanism; and the driving mechanisms drive push rods to control the opening and closing of the baffles. When the oil smoke concentration is low, the lower baffle is opened, and oil smoke is sucked through the lower smoke inlet; when a kitchen range is high, the upper baffle is opened, and the oil smoke is sucked through the upper smoke inlet; and the upper baffle and the lower baffle are opened simultaneously if the smoke is dense, and the oil smoke is synchronously sucked through the upper smoke inlet and the lower smoke inlet.

The embodiment of the invention discloses a range hood system and a noise feedback control method and device thereof. The range hood system comprises a range hood assembly and a fan assembly; the noise feedback control method comprises the steps that in a first working stage, the range hood assembly is controlled to be started, the fan assembly is closed, the range hood assembly is driven to run to the i range hood rotating speed of a target constant air volume value so as to be matched with resistance of a public flue, and the situation that the noise of a current range hood system is larger than a specific noise value is judged in the matching process, the second working stage is switched; and in the second working stage, the range hood assembly is driven to keep running at the first-stage range hood rotating speed before the range hood rotating speed during switching, and the fan assembly is driven to run to the j fan rotating speed of the target constant air volume value till the j fan rotating speed is matched with the resistance of the public flue. According to the embodiment, the noise of the range hood system is controlled not to exceed a specific noise value through noise feedback, meanwhile, constant effective air volume can be outputted without arranging an air volume sensor, and the smoke suction effect is ensured.

The invention discloses an embedded microwave oven with a novel smoke pumping structure. The embedded microwave oven comprises a cavity; a cross flow fan for exhausting is arranged in the cavity, the bottom of the cavity is fixedly provided with a hollow fixed panel, and a movable panel is communicated with the space of the cross flow fan for exhausting; the front half part of the fixed panel is provided with the hollow movable panel capable of moving front and back, and the movable panel is glidingly matched and communicated with the fixed panel; the movable panel is manually moved by a user during moving backwards, and can be automatically popped up by pressing of the user during moving forwards in a closed state; and the lower panels of the fixed panel and the movable panel are provided with a fixed airflow inlet and a movable airflow inlet respectively. The smoke pumping structure of the microwave oven can enlarge the area of the airflow inlets for sucking hot air or smoke generated by cookers below the microwave oven, so the hot air or the smoke is prevented from being dissipated from four sides of the microwave oven, the smoke pumping effect of the microwave oven is ensured, and a healthy smoke-free kitchen environment is brought to the user.

The invention belongs to the technical field of intelligent home, and particularly relates to an intelligent home kitchen ventilator good in smoke sucking effect. The problem that an existing kitchenventilator is poor in smoke sucking effect is solved. The kitchen ventilator comprises a fixed frame, shell sliding grooves are formed in the inner walls of the two sides of the fixed frame, shells are in sliding connection to the inner walls of the two shell sliding grooves, a screw mounting hole is formed in one side of the outer wall of the top of the fixed frame, a screw is connected to the inner wall of the screw mounting hole through a bearing, an adjusting motor is fixed to one side of the outer wall of the top of the fixed frame through a screw, an output shaft of the adjusting motor is fixed to the outer wall of one end of the screw through a coupler, and sliding plate sliding grooves are formed in one sides of the inner walls of the bottoms of the shells. The height of the shellsand the angle of a rotation plate can be conveniently adjusted, use convenience and rapidness are improved, the oil in lampblack can be cooled in an accelerated manner, the oil and smoke separation effect can be improved, the influence of oil on an exhaust fan and fan blades can be reduced, and the smoke sucking effect can be improved.

The invention provides a method for controlling a range hood with drainage function and the range hood, and relates to the technical field of kitchen appliances. The range hood includes a processor and a housing assembly that forms a smoke collecting chamber inside. The housing assembly is provided with a main smoke inlet, an auxiliary smoke inlet and a smoke outlet. A main fan is installed in the smoke collecting chamber. The smoke port is connected; the shell assembly is equipped with a drainage device, which is used to drive the external oil fume into the volute of the main fan through the auxiliary smoke inlet; the range hood also includes a detection component, which is used to detect factors that can reflect the amount of external oil smoke , the detection component, the main fan and the drainage device are all connected with the processor. The control method is used to control the use of the above range hood. The control method can intelligently adjust the smoking amount according to the amount of oil fume, and has good smoking effect and less phenomenon of running smoke.

The invention relates to the technical field of kitchen appliances, in particular to a range hood and a control method thereof. The range hood comprises a range hood body, an oil screen, a lampblack guide plate and a guide portion, wherein the oil screen is arranged on the range hood body; the lampblack guide plate is movably connected with the range hood body, and the lampblack guide plate has an initial state of at least partially covering the oil screen and a working state of keeping away from the oil screen; the guide portion is suitable for guiding the lampblack guide plate to be switched between the working state and the initial state relative to the range hood body; and when the lampblack guide plate is switched from the initial state to the working state, the first end of the lampblack guide plate extends downwards in the height direction. According to the range hood, the contact time of lampblack and the lampblack guide plate is prolonged, the condensation area of the lampblack is increased indirectly, the filtering effect of the lampblack is improved, and the effect of combining a top range hood and a side range hood is achieved.