26results about How to "Even airflow" patented technology

This utility model discloses a robotic gripper for injection molding machines, relating to the field of gripper technology. The gripper includes a connecting block with a mounting cavity at its front end. A base block is fixed to the lower end of the connecting block, and a motor cavity is formed through the upper end of the base block. The mounting cavity communicates with the motor cavity, and a motor is installed inside the motor cavity. A fan is fixedly connected to the output end of the motor. This utility model drives the fan to rotate via the motor, and the airflow generated by the fan is blown downwards through a grid plate. The grid plate serves a protective function, preventing external debris from entering the motor cavity and affecting the normal operation of the fan and motor, while also ensuring uniform airflow. The airflow generated by the fan cools the gripped components and the material being gripped, preventing deformation or damage due to excessive temperature. It also helps reduce the heat generated by friction and other factors during operation, improving the gripper's service life and operational stability.

The utility model discloses a tubular electric tar precipitator relates to industrial waste gas treatment equipment technical field, it includes casing, inlet pipe, sedimentation pipe subassembly, corona pole, sedimentation pipe subassembly contains a plurality of sedimentation pipes, still includes upper head, lower head, airflow equalizer, tar collection tank, drain pipe, heating jacket and sealing door, and the gas that waits for processing enters casing through inlet pipe, is evenly distributed to each sedimentation pipe by airflow equalizer, under the electric field effect that corona pole generates, and tar is adsorbed in the inner wall of sedimentation pipe, and then is collected to tar collection tank, and heating jacket prevents tar solidification, and is discharged through drain pipe, the utility model discloses has improved tar trapping efficiency and equipment stability, and the practicality is strong, is suitable for industry popularization.

This utility model discloses a heat dissipation and dust prevention device for a frequency converter, including a frequency converter body. The bottom shell of the frequency converter body is provided with a heat dissipation window. It also includes a dust prevention mechanism and a cooling fan. The dust prevention mechanism includes a dust cover, a bent guide tube, a first resistance frame, a second resistance frame, dustproof cotton sheets, and a screw seat. By setting the dust prevention mechanism at the frequency converter body outside the heat dissipation window, together with the cooling fan, a heat dissipation and dust prevention structure is formed. The dust prevention mechanism can effectively trap dust through components such as the dust cover, the first resistance frame, and the dustproof cotton sheets in the second resistance frame, preventing dust from adhering to the cooling fan and fins inside the frequency converter body. Furthermore, the dust cover of the dust prevention structure is equipped with a cooling fan. The cooling fan, together with the bent guide tube, the dust cover, and the side wall air grooves of the first resistance frame and the second resistance frame, form a meandering airflow structure, which intercepts dust while ensuring smooth airflow and ensuring efficient heat dissipation of the frequency converter.

The application discloses a cyclone combustion system of a wing wall furnace boiler, wherein the lower furnace, the main combustion area furnace and the upper furnace all comprise a front wall, a right side wall, a back wall and a left side wall; the front wall, the right side wall, the back wall and the left side wall of the main combustion area furnace are all provided with inclined wing walls between two adjacent sides; each of the four wing walls is provided with a wind distribution chamber; each of the four wind distribution chambers is provided with a burnout air device and two or more layers of cyclone pulverized coal burners from top to bottom; the axes of the burner nozzles of the cyclone pulverized coal burners of the same layer in the four wind distribution chambers are arranged in a diagonal line in pairs; and the cyclone pulverized coal burners of the same layer in the four wind distribution chambers are all connected with the same coal mill; the application can improve the self-stable combustion capacity, the uniformity of the airflow in the furnace and the flame fullness, avoid the flame brushing the wall, realize the good combustion air power flow field organization in the furnace, precisely control the smoke temperature deviation, ensure the safe operation of the large-capacity high-parameter boiler and better meet the high-index requirement of the new generation of coal power technology.

The utility model provides a kind of wind chamber structure of spouted fluidized bed, comprising: wind chamber body, bottom air inlet, top air outlet, air distribution plate is provided with two layers, lower layer main air distribution plate and upper layer auxiliary air distribution plate are left empty along vertical direction, as buffer cavity, the aperture of main air distribution plate upper air hole is greater than the aperture of auxiliary air distribution plate upper air hole, auxiliary air distribution plate upper air hole is more dense compared with main air distribution plate upper air hole distribution, main air distribution plate and auxiliary air distribution plate are vibratable by vibration motor driven and installed in chamber as a whole;Air inlet component is used to the bottom air inlet of wind chamber body;Gas-solid separation component is used to receive the top air outlet of wind chamber body and carry out gas-solid separation;Material backflow component is used to receive the solid material separated by gas-solid separation component, and send into wind chamber body chamber by material backflow port.The utility model can improve the production status of air distribution plate easy to block, reduce the adverse effects caused by air distribution plate blockage on the running performance and process effect of spouted fluidized bed, and protect the normal operation of equipment.

The utility model provides a coating device, which comprises a coating barrel, an inner cavity of which comprises a fluidization cavity and an air cavity located at the bottom of the fluidization cavity; the first fluidization plate is arranged in the coating barrel so as to separate the fluidization cavity from the air cavity, and the first fluidization plate is provided with a plurality of first ventilation openings so as to communicate the fluidization cavity with the air cavity; the rotating part is located in the fluidization cavity, the rotating part can rotate relative to the coating barrel in the height direction of the coating barrel, and the rotating part comprises a second fluidization plate spaced from the first fluidization plate and a plurality of stirring plates evenly distributed on the top of the second fluidization plate in the circumferential direction; the second fluidization plate is provided with a plurality of second ventilation openings. By arranging a plurality of stirring plates uniformly distributed at the top of the second fluidization plate in the circumferential direction, the rotating part can stir air in the coating barrel when rotating relative to the coating barrel, so that the airflow is more uniform, the distribution of powder is more uniform, and the coating effect of a workpiece is better.

The utility model discloses an air cooling fuel cell system integrated structure belongs to fuel cell technical field. The integrated structure is to set up fuel cell stack and its auxiliary components on the air deflector cover, and the side plate of air deflector cover and the cathode bottom plate, anode bottom plate of electric pile are connected to form the side surrounding casing structure of fuel cell stack, and the opposite side of fuel cell stack and fan is without side plate and opens to the environment, the fan in air management subassembly provides fresh air to the cooling and cathode flow channel on the polar plate in fuel cell stack, in hydrogen circulation subassembly, hydrogen passes control valve and enters hydrogen into the stack mouth on the cathode bottom plate, supplies to the anode manifold entrance of fuel cell stack through hydrogen flow channel in the cathode bottom plate, and the hydrogen that is not consumed is led out again by hydrogen out of the stack mouth on the cathode bottom plate and enters hydrogen circulation pipeline, and it is controlled by circulating pump to return to hydrogen into the stack mouth on the cathode bottom plate again. The utility model optimizes and reduces the overall size of fuel cell, guarantees the heat dissipation performance and improves the space utilization of fuel cell.

The utility model discloses a nozzle type aluminum alloy variable air volume valve, which particularly relates to the technical field of air valves and comprises two valve plates, two ends of the two valve plates are jointly connected with an air guide component, two blades are mounted between the two valve plates, and a linkage component is connected between the two blades. The two valve plates and the two air guide assemblies jointly form a nozzle structure, a plurality of first air inlets are formed in the inner sides of the ends of the air guide assemblies and jointly connected with a first air inlet cavity, a first air pipe is installed on the outer side of the first air inlet cavity, and a plurality of second air inlets are formed in the inner sides of the middles of the air guide assemblies. The multiple second air inlets are jointly connected with a second air inlet cavity, and a second air pipe is installed on the outer side of the second air inlet cavity. The nozzle type structure designed on the basis of the Venturi effect solves the problems of low precision and easiness in dust accumulation and blockage during differential pressure measurement, and has the advantages of high measurement precision, strong dust accumulation and blockage resistance, accurate air volume regulation and control, high processing efficiency and good product quality.

This utility model relates to the field of furniture manufacturing technology and discloses a drying rack for furniture manufacturing, including an outer shell, fixing ports, and a sealing cover. The outer shell has multiple fixing ports on both sides. The outer walls of the outer shell are connected to the sealing cover via first rotating shafts on both sides. A rotating device is installed inside the outer shell, and a fan is installed at the rear of the rotating device. The rotating device includes a first support plate, a second rotating shaft, and a plate body. Multiple first support plates are provided inside the outer shell. The two sides of the first support plates are connected to the plate body via second rotating shafts. The outer side of the plate body is connected to wheels via a third rotating shaft. The wheels are located inside a sliding groove, which is located inside the second support plate. The outer side of the second support plate is connected to the inner wall of the outer shell. This utility model saves time in disassembling the raw solid wood boards for drying and improves the working efficiency of the device.

The utility model discloses a humidifier, and relates to the technical field of humidifier structures, the humidifier comprises a shell, a wet curtain assembly and a fan assembly, the shell is provided with an air inlet, an air outlet and a ventilation channel communicated with the air inlet and the air outlet; the wet curtain assembly is arranged in the ventilation channel and is made of a washable material, an air passing channel is defined in the inner side of the wet curtain assembly, an air inlet channel communicating the outer side of the wet curtain assembly with the air passing channel is defined in the side portion of the wet curtain assembly, and a water passing channel extending in the vertical direction is formed in the wet curtain assembly; the fan assembly is arranged in the ventilation channel and located at the upper end of the wet curtain assembly, the fan assembly is used for driving airflow to flow from the air inlet to the air outlet, and the horizontal sectional area of an opening of the air inlet end of the fan assembly is smaller than or equal to the horizontal sectional area of the air passing channel. The utility model aims to provide the humidifier structure which is sufficient in inlet air, smooth in airflow and good in humidifying performance.

The utility model relates to the technical field of air-cooled radiators, in particular to a pouring radiator, which comprises a substrate, a plurality of radiating fins are welded on the substrate at equal intervals along the length direction, each radiating fin is provided with a through hole, a pipeline is inserted into the through hole, a plurality of connecting rods are fixedly connected onto the substrate, the connecting rods and the radiating fins are positioned on the same side, and the connecting rods are connected with the radiating fins. One end of each connecting rod is fixedly connected with the same wind scooper, the wind scooper is in contact with the heat dissipation fins, and an air outlet is formed in the wind scooper and right faces the heat dissipation fins. Cooling air generated by the fan is guided into the wind scooper, the wind scooper guides air-cooled air, the air-cooled air in the wind scooper penetrates through the air outlet to be in contact with the heat dissipation fins to conduct air-cooled heat dissipation on the heat dissipation fins, the wind scooper guides the air released by the fan, concentrated airflow passes through the heat dissipation fin area, and the heat dissipation effect of the heat dissipation fins is improved. Airflows on the surfaces of the heat dissipation fins are smooth, and the heat dissipation efficiency is improved.

This utility model relates to a negative pressure ward ventilation system that combines normal and epidemic ventilation, including a ward system, multiple vertical exhaust systems, and multiple horizontal exhaust systems. The ward system includes at least two floors, with at least two wards arranged vertically on each floor. Each ward includes a treatment area and a toilet. Each floor has a horizontal exhaust system, which is connected to the treatment area and toilet of the corresponding ward through exhaust branch pipes. The vertical exhaust systems run vertically through each floor, and the vertical exhaust shafts are connected to the toilets of the vertically aligned wards on each floor. This utility model uses the horizontal exhaust system during epidemics and the vertical exhaust system during normal times, avoiding the high energy consumption of the exhaust fan units caused by the long exhaust pipes, numerous valves, and high resistance of the horizontal exhaust system during normal times. It saves energy consumption of the ventilation system during normal times, and is low in cost and reliable in performance.

The utility model relates to metallurgical smelting flue gas dust removal technical field, including the flue gas pretreatment mechanism, multistage dust removal mechanism and the air draft smoke exhaust mechanism of intercommunication in proper order, flue gas pretreatment mechanism gas inlet end with oxygen enrichment side blowing furnace smoke dust export intercommunication, flue gas pretreatment mechanism gas outlet end is connected with multistage dust removal mechanism gas inlet end, and the air draft smoke exhaust mechanism is installed in multistage dust removal mechanism gas outlet end, the utility model discloses a flue gas pretreatment mechanism, multistage dust removal mechanism, air draft smoke exhaust mechanism three -level series connection type structure, first through spray cooling, current rectification, primary settlement complete high -temperature flue gas pretreatment, reduce flue gas temperature, equalize airflow, intercept big particle dust, then utilize bag filter dust removal subassembly fine filtration fine smoke dust, and the dust continuous collection is realized to grading automatic unloading, greatly promote dust removal stability, filter precision, prolong the service life of filter bag, and the uninterrupted smelting condition of adaptation oxygen enrichment side blowing furnace.

The application belongs to the technical field of purification, and specifically discloses a modular filter-adsorption device, which comprises a filter-adsorption body, an air inlet and an air outlet are arranged on the two sides of the filter-adsorption body respectively, a filter-adsorption assembly is assembled on the filter-adsorption body and located between the air inlet and the air outlet, and a plurality of assembling components are arranged on the filter-adsorption body, the filter-adsorption assembly is detachably assembled on the filter-adsorption body through the assembling components, the plurality of assembling components form a plurality of assembling paths, each assembling path forms an air inlet path and an air outlet path with corresponding guide and corresponding path respectively, the air inlet path and the air outlet path form a guide angle with the filter-adsorption body respectively, the assembling components are arranged along the circumference of the filter-adsorption body, and the filter-adsorption surface formed by the filter-adsorption assembly in the filter-adsorption body is a bevel.

The invention relates to the technical field of household appliances, belongs to household kitchen appliances such as energy-saving ovens, and discloses a door body assembly of cooking equipment and the cooking equipment. The cover plate is fixed to the inner surface of the outer door, a fan mounting cavity and a camera mounting cavity are defined by the cover plate and the inner surface of the outer door, the camera mounting cavity comprises a first cavity and a second cavity, the first cavity is located on the upstream of the fan mounting cavity in the flowing direction of airflow, the first cavity faces the outer door and communicates with the outer side of the outer door and the fan mounting cavity, and the second cavity communicates with the fan mounting cavity. The second cavity is located at the downstream of the fan mounting cavity, and an exhaust outlet is formed in the side, away from the fan mounting cavity, of the second cavity; the fan is arranged in the fan mounting cavity, and an air outlet of the fan communicates with the second cavity; the camera assembly comprises a first part located in the first cavity and a second part located in the second cavity, the working condition of the camera assembly can be better improved, and the service life of the camera assembly is prolonged.

This invention belongs to the field of grate cooler technology, and particularly relates to a support structure for a grate bed and its usage method. One such support structure includes: a grate beam with an air chamber along its length at its upper end; an air inlet communicating with the air chamber and located on the bottom wall of the grate beam; and an adjusting support member vertically positioned within the air chamber of the grate beam to support the grate layer. Cooling air flows into the air chamber through the air inlet, and the cooling air drives the blades of the adjusting support member to rotate 90°, allowing the cooling air to flow smoothly along the air chamber. The rotatable blades, rotating 90°, enable the cooling air to flow smoothly along the inner wall of the air chamber. The upper end of the adjusting support member supports the grate layer, avoiding the airflow turbulence problem associated with existing reinforcing ribs.

The utility model discloses a kind of angle of automatic adjustment push force fan, it is related to air cushion vehicle accessory technical field, the utility model includes fan shell, fan shell top is connected with mounting seat, and mounting seat outer surface is connected with vertical rod, vertical rod one end is connected with support ring, vertical rod both ends are connected with cross bar;Second support rope is arranged in cross bar, and second support rope is connected with second pressure rod between cross bar, first support rope is arranged in vertical rod.The utility model is set by mounting seat, vertical rod, cross bar and support ring, and protective net is formed by mounting seat, vertical rod, cross bar and support ring, mounting seat is the outer ring support base of protective net, and support ring is the inner ring support base of protective net, main body protection is carried out by vertical rod and cross bar, vertical rod and cross bar adopt water drop shape section and sharp part is towards fan blade, can guide airflow more smoothly pass through, help to reduce the generation of vortex, turbulence;Air resistance generated by protective net is reduced, so as to play certain energy-saving effect.

This invention belongs to the field of automotive manufacturing technology and discloses a hydrogen engine and its control method, as well as a vehicle. The engine includes a crankcase ventilation system, a hydrogen scavenging system, and an ECU. An air filter is installed in the engine intake pipe. The crankcase injection pipe is connected to the engine intake pipe and the crankcase. Both a low-load outlet branch and a high-load outlet branch are connected in parallel to the crankcase outlet pipe and the engine intake pipe. A vacuum pump is installed on the high-load outlet branch. Hydrogen concentration sensors are respectively installed in the crankcase, on the crankcase outlet pipe, and on the intake manifold. A scavenging pipe is equipped with a scavenging pump and is connected to the hydrogen rail and the intake manifold. The low-load outlet branch is connected to the scavenging pipe. The crankcase ventilation system and the hydrogen scavenging system are electrically connected to the ECU. This invention monitors the engine hydrogen concentration. The vacuum pump delivers hydrogen from the crankcase and pipes into the cylinders for combustion. When the engine is stopped, it effectively scavenges and burns the hydrogen in the hydrogen rail, improving engine safety.

The present application relates to the technical field of coal underground in-situ gasification, and particularly relates to a high-gas coal seam coal underground in-situ gasification safety ignition method. The present application accurately divides the ignition area based on the length, width and coal seam thickness of the gasification channel; meanwhile, the present application adopts a double-monitoring-unit setting mode of the ignition area and the gas transmission direction to realize blind area-free monitoring of the gasification channel, which not only meets the partition monitoring requirement, but also guarantees the continuity and accuracy of parameter collection, and provides reliable data support for subsequent gasification channel pressure maintenance, purging and ignition point selection. The present application adopts gas introduction for pressure maintenance treatment in the gasification channel, so that the gas adsorbed in the coal seam fissures can be separated out and mixed with air, and the distribution of the gas in the whole channel and the surrounding fissure network is more uniform; meanwhile, the gasification channel is purged after pressure maintenance, so that the gas in the gasification channel can be quickly discharged, and the efficiency of gas discharge is increased.

The utility model provides a dust removal device for tunneling mining operation, which belongs to the technical field of dust removal equipment and comprises a dust removal box, an air compression tank is arranged on the front side of the dust removal box, and a negative pressure fan is arranged on the dust removal box on one side of the air compression tank. The air compression tank and the negative pressure fan are electrically connected with a main control box on the rear side of the dust removal box through connecting wires; an access cover is movably arranged on one side of the dust removal box, an air inlet is formed in the other side of the dust removal box, and a cloth bag mechanism is movably arranged in the dust removal box; one side of the air inlet is connected with the dust removal box, and the other side of the air inlet is provided with an air inlet guide mechanism. Dust is efficiently and flexibly collected through the air inlet guide mechanism capable of being adjusted at multiple angles and the adjustable expansion plate; all the components are controlled in a centralized mode through the main control box, and centralized control operation is achieved; and through modular design and a reasonable connection structure, maintenance is convenient, and it is guaranteed that the device is stable and reliable.

The utility model discloses a new energy vehicle battery heat management system, including the heat exchange box, and the heat exchange box is connected with the high temperature component in the car through the heat absorption device, the vehicle air conditioner has the second air outlet, and the import of heat exchange box is connected the air outlet of circulating fan through the circulation pipeline, and the import of heat exchange box is connected the second air outlet of vehicle air conditioner through the ventilation pipeline, the battery package is located in the ventilation box, and the air inlet of circulating fan is connected with the first two three way electromagnetic valve through the circulation pipeline, and the first two three way electromagnetic valve selectively connects the filter or the export of ventilation box, the pipeline connection between the first two three way electromagnetic valve and the export of ventilation box has the second two three way electromagnetic valve, and the second two three way electromagnetic valve selectively communicates the discharge position or the first two three way electromagnetic valve, and the export of heat exchange box is connected the import of ventilation box through the pipeline, the utility model discloses through the full use of the heat of automobile existing components such as drive motor and the cold of vehicle air conditioner, regulates and controls the battery package temperature, saves the cost of additional refrigeration system, and the cost and energy consumption are reduced significantly.

This application discloses an anti-decubitus massage pad for a nursing bed, comprising a base body and multiple rows of massage columns. The base body is configured to be laid flat on the nursing bed. An airflow channel is provided within the base body, and air inlets are provided on the base body. Several rows of first ventilation holes are provided on the top surface of the base body. The two ends of the airflow channel are connected to the air inlets and the first ventilation holes, respectively. The air inlets are connected to an external air supply component, which is configured to supply gas to the airflow channel. Multiple rows of massage columns are spaced apart, with each row including multiple massage columns spaced apart. The massage columns are installed on the top surface of the base body. The aforementioned anti-decubitus massage pad for a nursing bed disperses local pressure on the patient through the contact of the massage columns, avoiding circulatory disorders caused by prolonged pressure. The airflow channel ejects gas through the first ventilation holes, keeping the skin dry on one hand, and the airflow impact assists in massage, promoting local blood circulation and improving the anti-decubitus effect.

The handheld wafer suction cup comprises a wafer suction cup body, an air control base is installed in the middle of the top end of the wafer suction cup body, the outer side of the air control base is connected with a plurality of airflow branch bases distributed in an annular array, a main air cavity is formed in the middle of the air control base, and an air source access hole communicated with the main air cavity is formed in the outer wall of the air control base. The outer end of the air source access hole is connected with an air source connecting pipe, the flow dividing air channels in the main air cavity are communicated with the air flow channels in the air flow branch base in a one-to-one correspondence mode, the middle of the bottom end of the air flow branch base is provided with an air sealing gasket, and the air control base is provided with a balance exhaust hole. Through the non-contact adsorption design, stable adsorption of the wafer is realized by using the Bernoulli effect, and the problems of surface scratch, edge cracking and pollution caused by traditional mechanical clamping or contact vacuum adsorption are avoided.

The utility model discloses a kind of hot-rolled H-shaped steel fatigue detection temperature regulating devices, including upper heat preservation cover and lower heat preservation cover, upper heat preservation cover is located above lower heat preservation cover, detachable fixed connection is between upper heat preservation cover and lower heat preservation cover, multiple support steel wires are set in the inside of upper heat preservation cover and lower heat preservation cover, multiple support steel wires are parallelly arranged, upper heat preservation cover and lower heat preservation cover are made of flexible material, the length of upper heat preservation cover and lower heat preservation cover can be telescopic, and upper heat preservation cover and lower heat preservation cover are all connected with air inlet pipeline.In the utility model, the both ends of H-shaped steel are fixed on fatigue detection device, upper heat preservation cover and lower heat preservation cover are folded and wrapped around H-shaped steel, then air is blown into one side of H-shaped steel through air inlet pipeline, hot air or cold air can be selected according to needs, the temperature of the environment where H-shaped steel is located is adjusted, fatigue detection can be carried out on H-shaped steel after adjustment is completed, and the detection result can be more accurate.

The utility model relates to the technical field of medical instruments, in particular to a rock salt aerosol therapeutic apparatus. The aerosol therapeutic apparatus comprises a gas generation pump and an atomizing cup, the gas generation pump comprises a shell and a gas pump assembly, and a silencer, a pump assembly fixing groove, a damping assembly and a silencer pipeline guide structure are arranged in the shell; the pump assembly fixing groove is formed in the middle in the shell, and the damping assembly is arranged in the pump assembly fixing groove to support and make contact with the air pump assembly and achieve buffering and damping. The silencer pipeline guiding structure comprises a plurality of air pipe guiding grooves, and the air pipe guiding grooves guide the silencer pipeline to enable the silencer pipeline to extend in the shell in a smooth and bent mode with the air inlet as the starting end. The silencer pipeline is connected with the inlet end of the silencer, the pump air inlet pipe connected with the outlet end of the silencer is connected with the air pump assembly, and the air pump assembly is connected with the air outlet through the pump air outlet pipe. The gas generating pump of the aerosol therapeutic apparatus is shock-absorbing and noise-reducing, and is more comfortable to use and convenient to assemble; atomized airflow in the atomizing cup is uniform and free of leakage, the separation efficiency is high, and disassembly is convenient.

The utility model relates to asphalt mixing station technical field, and disclose asphalt mixing station recovery powder processing device, including support seat and install the processing structure on the upper end of support seat, the upper end of processing structure is equipped with the feed pipe, the upper end of support seat is equipped with humidification structure still, will recovery powder from the feed pipe and pour into the processing jar, and start the water pump, cooperate and connect the pipe, annular pipe and atomizing spray head and spray water, can add humidity to recovery powder, at this moment, the wet powder will drop on the screen plate, and simultaneously start the motor, can drive the rotation of the shaft, and then drive the screen plate, stirring rod and scraper rotate, can agitate recovery powder, and sieve with the aid of screen plate, can sieve the impurity, and simultaneously with the aid of dredging spare from the screen plate lower direction and blow gas, can agitate the wet powder, and dredge the screen hole on the screen plate surface, so as to prevent the screen plate from being blocked and affecting screening, and cooperate filter gauze cover to prevent the wet powder from entering the nozzle along with the airflow, make the airflow keep smooth.