42results about How to "Speed up ventilation" patented technology

The present invention relates to a gas detection and automatic fan control system for a coal mine, and comprises an exhaust fan; the input end of the fan is connected with a transducer which is connected with the output end of a SCM through a data / mode converter; the input end of the SCM is connected with a gas consistency sensor through the data / mode converter and a safety fence which are connected in order; the another input and output of the SCM are respectively also connected with corresponding keypads and a LED which shows the measured consistency and sets the consistency. The present invention can realize a normal low-power operation of ventilation during the absence of gas, thereby saving energy; and as the increasing of the gas consistency, the fan can operate and ventilate in high speed, thereby reducing the gas temperature in very short time, preventing the gas explosion and safeguarding the life security.

The invention mainly discloses a constant-temperature silkworm frame applied to bombyx mori cocooning. The constant-temperature silkworm frame comprises a bottom frame, a silkworm breeding frame, a feeding frame, a ventilating frame and a top board which are arranged from bottom to top. A first heating device is disposed in the silkworm breeding frame. The first heating device comprises a thermal insulation board, a heating plate, a warming plate and a temperature-sensitive plate. Side portions of the feeding frame are provided with feeding holes, and a feeding plate is disposed in each feeding hole. Front and back sides of the ventilating frame are uniformly provided with air vents. An upper portion of the right side of the ventilating frame is provided with a slot. The top board is inserted into the slot to cover the ventilating frame. The top board is provided with a second heating device and a power supply device. The second heating device comprises a heating lamp, a temperature-sensitive rod, a display screen and an adjusting button. The heating lamp is installed at a lower surface of the top board. The temperature-sensitive rod is movably connected to the top board via a movable plate. Temperature of a silkworm breeding environment is strictly controlled, a good survival environment is provided for silkworms, survival rates of the silkworms are improved, feeding is convenient, permeability is good, cultivation space is large, breeding efficiency is high, and the constant-temperature silkworm frame is suitable for large-scale silkworm breeding.

The invention discloses a longwall mining method 110. The longwall mining method 110 is characterized in that a belt downhill channel, an air return downhill channel and a track downhill channel are arranged, the whole panel is provided with a plurality of working faces, an upper gate road and a lower gate road of each working face which is being mined are communicated with the belt downhill channel, the lower gate road is left in a roadway after the working face is mined to serve as the upper gate road of the next working face, and the lower gate road of the next working face is communicated with the air return downhill channel. According to the longwall mining method 110, as the upper gate road and the lower gate road of each working face which is being mined are communicated with the belt downhill channel, and the lower gate road of the next working face is communicated with the air return downhill channel, ventilation of the working face which is being mined is realized by not only the upper gate road and the lower gate road of the working face but also the lower gate road of the next working face, the ventilation quantity of the working face which is being mined is increased, the ventilation speed is also increased, and accordingly, the ventilation performance is improved to further improve the coal mine production security.

The present invention relates to a synthetic ventilating system using the heat exchanging system in the indoor ventilating system including a heat exchanging system and a controller, it is characterized in that it includes the following components: a main air supply pipe which supplies outdoor air to the indoor room; an electric valve which only does air supplying to the kitchen area when the kitchen air exhausting cover works; a first auxiliary air supply pipe which is connected with the bedroom area; a second auxiliary air supply pipe which is connected with the kitchen area; a first flexible pipe which supplies air to the bedroom area and the kitchen area; and a second flexible pipe which sucks air from the bedroom area and kitchen area. According to the invention the air feeding room is respectively divided to an apartment and a kitchen (including a parlor), the system only provides air to the kitchen to do air changing when the air exhausting cover of the kitchen works thereby restricting the diffusing of the pollutant and accelerating the air changing. Besides, the acoustic material is arranged at the venting pipe thereby preventing the operating noise of the transferring heat exchanging device and therefore the system provides a comfortable surrounding.

The invention discloses an elevator comprising an elevator shaft and a lift car; each layer of the elevator shaft is provided with an elevator opening; an elevator door is mounted at the elevator opening; the lift car is positioned inside the elevator shaft; even number of safe devices are mounted inside the elevator shaft; every two safe devices are set as a group, the safe devices of the same group are positioned at a same installation height, one is positioned at the elevator opening and the other is positioned at the other side, corresponding to the elevator opening, of the elevator shaft; the number of the safe device groups is identical to that of the elevator openings of the elevator; the safe device comprises a support board, a gear and a track; the elevator shaft is provided with an installing hole; the track is laid in the installing hole; the support board is provided with a rack; the gear is engaged with the rack; the gear is installed inside the installing hole; the gear is driven by a motor which is connected to a controller; a controller switch is installed inside the lift car. By means of the elevator of the invention, falling accidents are avoided when elevator wire ropes are broken.

The invention relates to an ozone disinfection power ventilator for remotely and online monitoring air quality. The ozone disinfection power ventilator comprises a ventilator shell which is provided with gas inlets and gas outlets. A plurality of air purification devices are arranged in the ventilator shell. Each air purification device comprises an ozone generator, an ozone removal filter screen and a draught fan. An air quality online monitoring and remote control system comprises a power supply, a direct-current conversion module, an air quality online monitoring module, a WIFI module, an intelligent cloud platform, an intelligent terminal, an IC controller, a draught fan drive module and a motor drive module. The air quality online monitoring module is connected with the WIFI module. The WIFI module is connected with the IC controller and the intelligent cloud control platform. The intelligent cloud platform is connected with the intelligent terminal. The power supply is connected with the IC controller. The IC controller is connected with the draught fan drive module and the motor drive module. By means of the ozone disinfection power ventilator, air quality can be monitored online, data can be remotely downloaded, ventilator ventilation is remotely controlled, people can completely breathe fresh air, and energy consumption can also be obviously lowered.

The invention relates to a ventilating basement which comprises an air inlet and an air outlet window, wherein the air inlet is connected with an air suction device arranged on the ground through a guide duct; the air outlet window is connected with an air draft device arranged on the ground through the guide duct; the air suction device comprises an air suction hood; the air suction hood is connected to one end opening of the guide duct in a free rotation manner through an adapter ring (6a); a guide pointer (7a) is fixedly mounted at the upper end of the air suction hood; the guide pointer (7a) and the axis of the air suction hood are in the same plane; the air draft device comprises a wind guide turbo; the wind guide turbo is connected to one end opening of the guide duct in a free rotation manner through an adapter ring (6b); the rotating shaft of the wind guide turbo is perpendicular to the axis of the guide duct; a guide pointer (7b) is fixedly mounted at the upper end of a guide wheel; the guide pointer (7b) and the axis of the wind guide turbo are in the same plane. The ventilating basement is novel in structure, ensures a good ventilation environment, effectively prevents objects from mildewing, and further improves the air quality in the basement.

The invention discloses a large Mongolian yurt. The large Mongolian yurt has a steel frame structure, so that the bearing capacity, the firmness and the stability of the Mongolian yurt are greatly improved, and the requirement of the large Mongolian yurt can be met without arranging upright posts in the large Mongolian yurt. An inner and outer ring top structure is adopted, so that the Mongolian yurt has a double-layer top visually, and the inner space is increased; meanwhile, ventilating and lighting windows are arranged at second-layer upright posts to ensure the ventilation and lighting of the Mongolian yurt. A central top is a lifting top to enhance the lighting, ventilation and air exchange of the Mongolian yurt. A Mongolian yurt frame adopts a structure that many unit steel frames are connected and combined through bolts as far as possible, is suitable for the large Mongolian yurt and industrial volume production and is convenient to transport, set up and roll up. A base is dampproof and enables the setup of the Mongolian yurt not to destroy the original grassland. The large Mongolian yurt maintains the characteristics of the traditional Mongolian yurt, improves the traditional Mongolian yurt, and is a large Mongolian yurt having both traditional and modern styles, and is particularly suitable for meetings, exhibitions and entertainment and dining places.

The invention discloses a window type air conditioning device, especially installed on the window of edifice. It includes window frame, carcass, indoor heat exchanger, air condition regulation section, and condensation water distributor. The invention could ventilate the air of the building fluently, and decrease the cost. It improves the use rate of the room space.

The invention discloses a prevention and treatment method for tomato spotted wilt virus. According to the invention, tomato is cultivated in a solar greenhouse according to large and small rows, wherein large row spacing is 80 cm, and small row spacing is 60 cm; kale is transplanted in 10 to 12 days before field planting of the tomato, wherein a row of the kale is planted in the middle of a smallplanting row, and plant spacing is 25 cm; a carbonized rice husk contained substrate is adopted for seedling raising of the kale in plugs, wherein carbonized rice husk is additionally applied into a planting plug, and a dinotefuran pesticidal liquid is adopted for plug dipping and root irrigation; and before the kale is transplanted, a 40-mesh pesticidal protection screen is used to seal a ventilation opening of the solar greenhouse. The prevention and treatment method provided by the invention can effectively reduce the incident rate of the tomato spotted wilt virus on the premises of greatlyreducing the usage amount of a chemical pesticide and realizing non-contact chemical prevention and treatment for a main crop, wherein the incident rate of the tomato spotted wilt virus of an infected tomato variety can be generally controlled within 4%.

The invention discloses a method for controlling tomato chlorotic viruses. The method comprises the steps of: planting tomatoes in a sunlight greenhouse according to the size of rows, wherein the rowspacing of large rows is 80 cm, the row spacing of small row is 60 cm; transplanting trap plants 15-20 days before final planting of the tomatoes, and planting a row of the trap plants between every two small rows of final planting rows, wherein the plant spacing is 25 cm; raising seedlings of the trap plants in hole trays by adopting a carbonized rice husk-containing substrate, applying carbonized rice husks into final planting holes additionally, and adopting a thiamethoxam chemical solution to dip the hole trays and water roots; and sealing a vent of the sunlight greenhouse with a 40-mesh insecticidal protective net before the trap plants are transplanted. According to the method, the incidence of the tomato chlorotic viruses can be reduced effectively under the premise of reducing thedosage of chemical pesticide greatly and achieving non-contact chemical control of the main crop, and the incidence of tomatoes infected by the tomato chlorotic viruses can be controlled at 5% or below generally.

The invention discloses a multifunctional protective door and window, and belongs to the technical field of doors and windows. The multifunctional protective door and window comprises an outer frame,wherein an inner frame body is arranged in the outer frame, first chutes are formed in both sides of the inner frame body, the first chutes are located in the outer frame, and a first mounting bin isformed in the outer frame. According to the multifunctional protective door and window, the first mounting bin is formed in the outer frame, the first chutes which communicate with the first mountingbin are formed in the both sides of the inner frame body, and a driving mechanism in the mounting bin is matched with a transmission mechanism composed of a driving gear, a connecting rod, a toothed belt, a rack and a driven gear in the mounting bin, so that a protective rod can be driven to move in the first chutes, the position of the protective rod is adjusted, the protective rod is conveniently converted indoors and outdoors, and the use is convenient; the protective rod is arranged in the outer frame, so that the functionality and the protective effect of the device are increased, and potential safety hazards due to the installation of a protective fence on the outer side of the door and window are avoided.

The air cleaning system of air conditioner is composed of following parts: enclosed frame, and electrical motor setup on the frame; being setup in front of the front cover, air intake grate can be rotated; front grate; blowing fan; indoor heat exchanger is setup between fan, suction inlet and the air intake grate; being setup above the frame, or above the front cover, top air intake grate can be turned to on / off; filter is setup on the top air intake grate; guide structure of filter is in use for setting up the filter. The guide structure includes structure of air intake diversion inside cavity, and ventilator inside cavity setup on the structure of air intake diversion. The air cleaning system of air conditioner can carry out ventilation for indoor quickly.

The invention discloses a prevention and control method for tomato chlorosis virus disease. Tomatoes are cultivated in a sunlight greenhouse according to sizes, the large row spacing is 80cm, and thesmall row spacing is 60cm; trapping plants are transplanted before field planting of the tomatoes in 15-20 days, a row of the trapping plants is planted in the middle of small rows of field planting rows, and the plant spacing is 25 cm; substrate discs containing carbonized rice husks are used for the trapping plants to culture seedlings, carbonized rice husks are applied to planting pits, and thiamethoxam solution is used for disc dipping and root irrigation; before the trapping plants are transplanted, a 40-mesh insecticidal protective net is used for closing vents of the sunlight greenhouse. The prevention and control method can effectively reduce the incidence of tomato chlorosis viruses on the premise of greatly reducing chemical pesticide dosage and achieving non-contact chemical control of main crops, and the incidence of the chlorosis viruses in susceptible tomato varieties can generally be controlled within 4%.

The invention discloses a drying oven and a heat flow circulation control method, and belongs to the technical field of sample total moisture determination. The problem of low drying efficiency of a current drying oven is solved. According to the technical scheme, the drying oven comprises an oven body and a chamber formed by the oven body in an enclosing mode, and the chamber is internally provided with a separating plate used for dividing the chamber into a first chamber and a second chamber which are arranged up and down; one end of the first chamber is provided with a sample feeding door,and the end, relative to the sample feeding door, of the oven body is provided with a heating cavity; an exhaust port is formed at the position, close to the second chamber, on the heating cavity, andthe heating cavity is provided with a switching door switched between a first position and a second position is arranged at the position of the exhaust port; when the switching door is located at thesecond position, the communication position between the heating cavity and the second chamber is blocked by the switching door, and the exhaust port is opened for performing an outer circulation mode. According to the above technical scheme, the drying oven has the advantages of high drying efficiency and applicability and the like.

The present invention relates to a gas detection and automatic fan control system for a coal mine, and comprises an exhaust fan; the input of the fan is connected with a transducer which is connected with the output end of a SCM through a data / mode converter; the input end of the SCM is connected with a gas consistency sensor through the data / mode converter and a safety fence which are connected in order; the another input and output of the SCM are respectively also connected with corresponding keypads and a LED which shows the measured consistency and sets the consistency. The present invention can realize a normal low-power operation of ventilation during the absence of gas, thereby saving energy; and as the increasing of the gas consistency, the fan can operate and ventilate in high speed, thereby reducing the gas temperature in very short time, preventing the gas explosion and safeguarding the life security.

The invention provides an intelligent agricultural maintenance management system based on Internet-of-Things control. The intelligent agricultural maintenance management system comprises a greenhousewall body, an air inlet hole, an air outlet hole, a sealing mechanism, a filtering mechanism, a temperature adjusting mechanism and a fan mechanism. The intelligent agricultural maintenance managementsystem based on Internet-of-Things control can solve the following problems in the agricultural maintenance management process that a, most ventilation devices related to agricultural greenhouses inthe current market are manually adjusted, the working intensity is relatively high, the environments in the greenhouses are basically controlled by human experience, and agricultural products are notmonitored in real time through an intelligent system; b, most existing ventilation devices do not adjust the temperature of air transmitted into the greenhouses from the outside, and the temperature is adjusted to the optimal temperature for the growth environment of the agricultural products; and c, the existing ventilation devices can only conduct ventilation and cannot effectively control the air speed, the situation that too high air speed affects production of the agricultural products and too low air speed cannot conduct effective ventilation is avoided.

The invention relates to a floatable comfortable high-elastic mattress, and belongs to the field of plastic products. The floatable comfortable high-elastic mattress comprises a mattress body, the mattress body comprises a first mattress layer and a second mattress layer which are arranged up and down, and the upper surface of the second mattress layer is provided with a groove group; the groove group comprises a plurality of grooves formed in the upper surface of the second mattress layer, the grooves are uniformly distributed in the upper surface of the second mattress layer in an array shape, through holes penetrating through the first mattress are formed in the first mattress corresponding to the grooves, and the diameter of each through hole is 0.5-1.5 mm; and two adjacent grooves in the groove group are communicated with each other through a channel, and the channel is embedded in the second mattress layer. The mattress has good elasticity and air permeability, and meanwhile has multiple purposes.

The invention relates to the technical field of smart home, and discloses an air conditioner pipeline automatic ventilation device based on intelligent manufacturing. The device comprises a pipeline,wherein a bearing block is fixedly connected to the interior of the pipeline, a wind shielding wheel is rotatably connected to the interior of the bearing block, a one-way stop block is inserted intothe inner wall of the wind shielding wheel in a penetrating mode, an extrusion rod is slidably connected to the side face of the one-way stop block, a transition wheel is rotatably connected to the side, close to a wheel center, of the extrusion rod, a bearing gear is connected to the side face of an extrusion toothed rod in a meshing mode, a screw is connected to the side face of the bearing gearin a meshing mode, a force storage block is inserted into the left side of the extrusion toothed rod in a penetrating mode, and a spring block is arranged at the bottom of the force storage block. According to the air conditioner pipeline automatic ventilation device based on intelligent manufacturing, through cooperative use of the wind shielding wheel and a driving wheel, the effect that when an air conditioner is not used for a long time, air in an exhaust pipe is prevented from becoming unpleasant or even generating peculiar smells is achieved.

The invention relates to a parachute canopy ventilation speed obtaining method. Various factors such as surrounding airflow attributes in the high-altitude flight process of a parachute, parachute flight speed and fabric microstructure characteristics are comprehensively considered. Based on a porous medium theory and a parachute canopy differential pressure-flight dynamic pressure equation in theparachute working process, the parachute canopy ventilation speed at any speed-height in the high-altitude flight process of the parachute can be rapidly calculated, and therefore guidance is provided for further calculation of the total ventilation amount of the parachute and design of the parachute. The whole technical scheme design does not need to pass a fabric air permeability test, a brandnew design scheme is adopted, and the obtaining efficiency of the target parachute canopy ventilation speed can be effectively improved.

This invention discloses a window type air condition equipment, especially relates to outer window that open freely outside room of building outer wall and inner window that open freely inside room of outer wall. Air exchange between inner space of buildings can be finished easily, set cost can be saved, so the sealing type window installed on outer wall of building can be changed onto more reasonable structure to raise space utility in house.

The invention discloses a safe elevator comprising an elevator shaft and a lift car; each layer of the elevator shaft is provided with an elevator opening; an elevator door is mounted at the elevator opening; the lift car is positioned inside the elevator shaft; even number of safe devices are mounted inside the elevator shaft; every two safe devices are set as a group, the safe devices of the same group are positioned at a same installation height, one is positioned at the elevator opening and the other is positioned at the other side, corresponding to the elevator opening, of the elevator shaft; the safe device comprises a cylinder, an extension spring and a support board; one end of the support board is hinged to the elevator shaft; one end of the extension spring is connected to the elevator shaft and the other end is connected to the support board; a pedestal of the cylinder is mounted on the elevator shaft; a push rod of the cylinder is hinged to the lower surface of the support board; the cylinders of all safe devices are connected to one controller; a switch of the controller is installed inside the lift car. By means of the safe elevator of the invention, falling accidents are avoided when elevator wire ropes are broken.

The invention discloses a multifunctional protective door and window, and belongs to the technical field of doors and windows. The multifunctional protective door and window comprises an outer frame,wherein an inner frame body is arranged in the outer frame, first chutes are formed in both sides of the inner frame body, the first chutes are located in the outer frame, and a first mounting bin isformed in the outer frame. According to the multifunctional protective door and window, the first mounting bin is formed in the outer frame, the first chutes which communicate with the first mountingbin are formed in the both sides of the inner frame body, and a driving mechanism in the mounting bin is matched with a transmission mechanism composed of a driving gear, a connecting rod, a toothed belt, a rack and a driven gear in the mounting bin, so that a protective rod can be driven to move in the first chutes, the position of the protective rod is adjusted, the protective rod is conveniently converted indoors and outdoors, and the use is convenient; the protective rod is arranged in the outer frame, so that the functionality and the protective effect of the device are increased, and potential safety hazards due to the installation of a protective fence on the outer side of the door and window are avoided.

The invention discloses a three-dimensional strawberry planting tank for intelligent agriculture. The three-dimensional strawberry planting tank comprises a base and is characterized in that directionwheels are mounted at four corners of the lower end of the base, a water tank is mounted inside the base, a support plate is mounted at the upper end of the base, fluorescent lamps are mounted on theperiphery of the support plate, a water adding port is arranged in the base on the right side of the support plate, a water pump is arranged on the base on the left side of the support plate, connecting pipelines are mounted on the surfaces of two ends of the support plate, cultivation tanks mounted below the connecting pipelines, water adding pipes are mounted above the cultivation tanks, and atop plate is mounted at the top end of the support plate. By the three-dimensional strawberry planting tank, the problems that existing strawberry planting equipment is inconvenient in planting, unsatisfactory in planting effect, poor in mobility and hard to satisfy strawberry growth environment requirements can be solved.

The invention discloses a large Mongolian yurt. The large Mongolian yurt has a steel frame structure, so that the bearing capacity, the firmness and the stability of the Mongolian yurt are greatly improved, and the requirement of the large Mongolian yurt can be met without arranging upright posts in the large Mongolian yurt. An inner and outer ring top structure is adopted, so that the Mongolian yurt has a double-layer top visually, and the inner space is increased; meanwhile, ventilating and lighting windows are arranged at second-layer upright posts to ensure the ventilation and lighting of the Mongolian yurt. A central top is a lifting top to enhance the lighting, ventilation and air exchange of the Mongolian yurt. A Mongolian yurt frame adopts a structure that many unit steel frames are connected and combined through bolts as far as possible, is suitable for the large Mongolian yurt and industrial volume production and is convenient to transport, set up and roll up. A base is dampproof and enables the setup of the Mongolian yurt not to destroy the original grassland. The large Mongolian yurt maintains the characteristics of the traditional Mongolian yurt, improves the traditional Mongolian yurt, and is a large Mongolian yurt having both traditional and modern styles, and is particularly suitable for meetings, exhibitions and entertainment and dining places.

The invention provides a water-based open-edge beaded skin-feeling waxy synthetic leather, and relates to the field of synthetic leather. The water-based open-edge beaded skin-feeling waxy synthetic leather comprises an open-edge beaded layer, a first elastic layer is arranged in the open-edge beaded layer, and a reinforcing layer is arranged in the first elastic layer. When the synthetic leatheris used for making clothes, in order to avoid the layering of the synthetic leather in the use process, trapezoidal blocks are arranged on the first elastic layer and a second elastic layer; soft hairs are arranged on the two sides of the trapezoidal blocks; through the bonding of the glue, the overall strength of the synthetic leather is enhanced; air holes are arranged to increase the ventilation rate of the synthetic leather; the generated sweat can be absorbed by cotton blocks arranged in the air holes, the clothes are kept dry, when a large amount of sweat is generated, the sweat is discharged through an arranged one-way flow guide layer, the sweat is greatly absorbed through the cotton of a sweat absorption layer, and the situation that the sweat is retained for a long time, and a large amount of peculiar smells are generated is avoided.

The invention relates to the technical field of electric appliance cabinets, and discloses a moisture-proof indoor electric appliance cabinet capable of accelerating ventilation, which comprises a frame, a baffle plate is fixedly mounted at the upper end of the frame, a ventilation pipe is fixedly mounted in the baffle plate, a moisture-proof mechanism is fixedly mounted at the bottom end in the frame, and a fixed frame is fixedly mounted at the upper end in the frame. According to the moisture-proof indoor electric appliance cabinet capable of accelerating ventilation, rotating rods rotate, when the rotating rods make contact with arc-shaped plates, the arc-shaped plates can be driven to move towards the two sides in a fixing frame, then the air release bags can be extruded under the cooperation of the effects of reset springs and supporting rods, in the extrusion process of the air release bags, air in the air release bags can be extruded out, and the air release bags are prevented from being blocked. And when the push rod is pushed to enter the upper end of the fixed frame, and then the push rod leaves the arc-shaped plate, the arc-shaped plate recovers to the original shape, and the air release bag is in an air suction state, so that air at the lower end of the fixed frame can be sucked into the air release bag, and the air exchange effect is achieved.

The invention discloses a fully automatic intelligent manhole cover for an escape outlet of a comprehensive pipe gallery, which comprises a base, and two first fixing plates are fixedly connected to one side of the bottom of the inner wall of the base. The invention has compact structure, simple and convenient operation, and strong practicability. By setting the cover plate and the base with the electric telescopic rod to cooperate with each other, the equipment can be automatically opened by the electric telescopic rod during emergency escape, without manual operation to open the cover, so as to achieve the purpose of rapid escape. Set up a ventilation mechanism and a transmission mechanism to cooperate with the oxygen concentration sensor inside the base, so that the equipment can monitor the oxygen concentration inside the integrated pipe gallery in real time, and at the same time, the ventilation mechanism can be opened through the transmission mechanism, thereby increasing the integrated pipe The ventilation effect inside the gallery, in addition, by setting an acceleration mechanism, the ventilation speed can be increased, thereby further increasing the ventilation effect inside the integrated pipe gallery.

A cooling fan comprises a shell provided with an air inlet and an air outlet, a humidification unit arranged in the shell, an air supply unit arranged between the humidification unit and the air outlet and a filter screen unit arranged between the air supply unit and the air inlet. A connecting portion for connecting the filter screen unit with the humidification unit is arranged between the filter screen unit and the humidification unit, and sucked air is blown out through the air supply unit after sequentially passing through the filter screen unit, the connecting portion and the humidification unit. The cooling fan has the beneficial effects that the situation that dust and particles directly enter a humidification device without passing through the filter screen unit is effectively avoided, and the air exchange capacity, humidification capacity and cooling capacity of the cooling fan are improved.