76results about How to "Optimize air volume" patented technology

The invention related to air condition of saloon car, especially to air return thermoregulated air condition of saloon car. The air condition includes air intake dual duct, refrigeration air duct, and air out duct. A blower fan is setup in the air intake dual duct. Air inlet of air intake dual duct is composed of fresh air inlet, air return inlet, and regulating door for fresh air setup between the fresh air inlet and the air return inlet. Evaporator of air conditioning unit is setup in the refrigeration air duct. Characters are that conduction through air duct insulated from refrigeration air duct is added between the air intake dual duct and air out duct. Air outlet of the conduction through air duct, and air outlet of the refrigeration air duct are led to the air out duct. The invention is in favor of reducing energy consumption caused by heating blast of air condition repeatedly.

The invention relates to a measurement system capable of spraying urea solution into exhaust flow (9) of combustion engine for selective catalytic reduction and a control method thereof. The measurement system is connected with a urea solution box (1) to taka out urea solution and the measurement system is also connected with a compressed air supplying device (6) wherein the measurement system comprises at least one nozzle (5) for spraying the urea solution into the exhaust flow in aid of compressed air. The measurement system comprises an air valve (7) to adjust the pressure and / or air amount and / or valve starting time of the compressed air supplying device (6) and a sensor for measuring the pressure and / or air amount in the compressed air supplying device (6) is set between the air valve (7) and the nozzle (5).

The invention discloses a frequency-adjustable atomizing dosing respirator which comprises a base, an oxygen tank, an air tank, an air-oxygen mixer, a fixing box and a control system.A mixing rotator is arranged in the air-oxygen mixer, an air pump is connected on the air-oxygen mixer, an air outlet end of the air-oxygen mixer is connected with an air purifier, an air outlet of the air purifier is connected with a humidifier, a pipeline is connected on the humidifier, and the other end of the pipeline is connected with a respiratory mask.The air pump is arranged on the oxygen tank and the air tank, so that frequency and air outgoing quantity can be adjusted conveniently to meet requirements of different patients; a heating plate and a temperature sensor are mounted in the air-oxygen mixer, so that gas needed by the patients can be heated and cleaned; an ultrasonic generator can ensure gas temperature to be unchanged in the humidifying process and can generate negative oxygen ions good for human body; the air purifier is arranged, so that germs in air guided in by a respirator body can be killed effectively.

The present invention discloses a bearing beam structure for a circular cooling trolley. The present invention is based on a rectangular beam, and a triangle beam is designed at the upper part of the rectangular beam, the upper plate of the rectangular beam is extended and broadened to the both sides to form an upper cross section which is a bottom edge of the triangle beam, a plurality of ventilation channels are arranged on the bevel edge steel plates at the both waists, an air ventilating channel is arranged on the bottom edge of the triangle beam, and the side plate of the rectangular beam is a component element of the trolley static seal. The present invention is used on a water seal circular cooling machine, has the main structure character that the trolley loading is supported by the rectangular beam, the triangle beam is used to discharge and guide, through ventilating with the air ventilating channel of three edges of the triangle beam, cold air under the grid plate of the trolley can be led to the both sides and upper material layers of the triangle beam, not only the cooling dead zone is eliminated, but also the total ventilating area of the trolley can be increased about 16 percent. As a component element of the trolley static seal, the side plate of the rectangular beam can prefect the sealing of the bearing beam structure bottom part and the trolley.

The invention provides an indoor unit of an air conditioner. The indoor unit comprises a shell, a baffle plate and an air deflector, wherein the shell is provided with an air outlet facing the front lower side; the upper end of the baffle plate is rotatably mounted on the shell, and a rotating shaft of the baffle plate is located at the upper edge of the air outlet, so that the baffle plate rotates to an opened position opening the front side of the air outlet or rotates to a closed position shielding the front side of the air outlet; and the air deflector is rotatably mounted on the shell andis configured to rotate to a first position, through which an air guide surface thereof faces upward, on the lower side of the air outlet, so as to guide a blowing air flow to the front side, the front upper side or the front lower side by the air deflector when the baffle plate is located in the opened position; and the air deflector is configured to rotate to a second position, through which the air guide surface faces forward, on the back side of the air outlet, so as to guide the blowing air flow to the lower side. The indoor unit of the air conditioner can blow cold air in a rising manner and blow hot air in a sinking manner.

The invention relates to a reflux type static dust removing device. The reflux type static dust removing device is characterized in that an omega-shaped polar plate is disposed on the upper portion of a belt conveyor, a plurality of through holes are formed in the top of the omega-shaped polar plate in an equal-distance manner, insulating tubes are disposed in the through holes, one ends of the insulating tubes are located on the inner side of the omega-shaped polar plate, the other ends of the insulating tubes are located on the outer side of the omega-shaped polar plate, a suspension rod penetrates each insulating tube to be connected with a barb connecting tube, the other end of the suspension rod is fixed on the upper portion of the insulating tube, barb corona wires are disposed on the barb connecting tube in an equal-distance manner, a vibrating motor is disposed on the omega-shaped polar plate, a reflex fan is disposed on one side of the top of the omega-shaped polar plate, an emptying fan is disposed on the other end of the top of the omega-shaped polar plate, a static generator is respectively electrically connected with the suspension rods and the omega-shaped polar plate, and the static generator is grounded. The reflux type static dust removing device has the advantages that the metal sealing cover on the belt conveyor is directly used as the dust collecting polar plate, a dust storage device is omitted, and the device is simple in structure, small in floor space, convenient to mount and maintain and suitable for places in land shortage and limited space.

The invention discloses a safety type electric fan which comprises an air suction assembly and an air outlet mask. The air outlet mask is provided with an air inlet hole, air guiding channels, air outlet narrow holes and an installing part. The air inlet hole is arranged on the back of the air outlet mask, the air outlet narrow holes are arranged on the front of the air outlet mask, and the installing part is arranged at the position of the center of the back of the air outlet mask. The air suction assembly comprises a casing, a suction fan arranged in the casing and an air duct arranged in the casing. One end of the casing is provided with a mesh plate serving as an air duct air inlet, the other end of the casing is provided with an air duct air outlet, one of the casing provided with the air duct air outlet is fixed in the installing part, and the air duct air outlet is communicated with the air inlet hole of the air outlet mask. The safety type electric fan is small in noise and large in air outlet quantity.

The invention discloses an all-round window which comprises a frame body and a window body arranged in the frame body, wherein the window body consists of a plurality of transparent hollow vanes; the adjacent vanes are in sealed connection with each other; and a rotating mechanism for driving the vanes to rotate to open and close is arranged in the frame body. The all-round window has the advantages of simple structure, convenience in use, capability of controlling the vanes to rotate to open and close and the like, and can replace the existing glass windows.

The invention relates to a self-correcting variable parameter fan coil temperature control method and special equipment. A temperature control device composed of a coil fan loop, a coil water valve loop, a control panel and a controller is arranged, a return air temperature signal is acquired by virtue of a return air temperature signal, the return air temperature sensor inputs the detected signal into an analog input port of the controller, a set temperature is input into the controller by virtue of the control panel, the controller carries out PID (proportion integration differentiation) operation processing on the input set temperature and temperature signal data input by the return air temperature sensor by utilizing linear relation between Pt resistance and temperature variation, and then an operation result is taken as a control signal and is sent to a direct current brushless fan and a floating valve mechanism, thus the direct current brushless fan and the floating valve mechanism synchronously act. According to the invention, the floating valve mechanism is controlled by an output voltage signal of the controller, and the floating valve mechanism is slowly opened or closed by virtue of an electrically driven valve, thus flowing around a target temperature value and oscillation can be avoided; and accuracy of control on a fan coil is improved, air quantity can be automatically or manually regulated, and the effect of saving energy can be obtained.

The invention relates to a smelting assistant for steel works, namely a low-temperature pulverization inhibitor for sintered ore. The low-temperature pulverization inhibitor is prepared by mixing carboxymethyl starch, boric acid, silicon micropowder and a permeate agent in designated proportion; compared with CaCl, Cl ion drag-in quantity is reduced more than 50%, the low-temperature pulverization inhibitor can not generate a replacement reaction with K and Na alkali metals in a furnace charge, therefore, the problem of continuous and circulating enrichment of KCl (kirchhoff's circuit laws) and NaCl in a blast furnace is solved, the reactivity of coke is restrained, the melting loss reaction is reduced, the heat intensity of the coke is ensured, low temperature reduction pulverization rate of the sintered ore is reduced, the destructive effect of the alkali metal on the coke and the blast furnace is basically solved, the furnace condition is smooth, and the output is increased.

The invention discloses a cooling fan, an air cooling system and an engine. The cooling fans are installed in the air cooling system and the engine respectively. Each cooling fan comprises a fan discand a plurality of blades connected to the fan disc and peripherally distributed. The tails of the blades are bent in the direction opposite to the rotating direction of the fan, wherein the cooling fan is in transmission fit with a driving wheel of a gearbox, the gearbox is of a CVT speed changing structure, the gearbox is integrated into an engine box, a guiding device is arranged at the inner side of an engine case cover and located between a driving shaft and a driven shaft, the upper end of the guiding device is provided with a flow guiding face, and the flow guiding face is inclined upwards from the inner side of the cooling fan to the side of an air outlet. The tails of the blades of the cooling fan are bent so that the windward sides of the blades can be in arc transition. An air flue damping coefficient is optimized, air flow is guided, and the wind resistance is effectively lowered; due to the structure, the wind resistance of the blades can be lowered, and the overall transfer efficiency of the gearbox can be improved. Meanwhile, the vortex phenomenon formed by the tails of the blades is avoided, the air volume in an air flue is optimized, the air cooling effect is improved, and noise is lowered.

The invention discloses a safe double-end electric fan with small noises and large air volume. The safe double-end electric fan with small noises and large air volume comprises an induced draft assembly and two air outlet surface shields; each air outlet surface shield comprises a panel and a back plate; an air outlet slot is formed in each panel; a mounting hole is formed in the center of each back plate; an air guide channel is formed between each panel and the corresponding back plate; the induced draft assembly comprises a shell, an induced draft fan, a first air duct and a second air duct; the induced draft fan is arranged in the shell; the first air duct and the second air duct are formed in the shell; a mesh plate used as an air inlet hole is arranged in the middle of the shell; a first air duct outlet is formed in the left end of the shell; a second air duct outlet is formed in the right end of the shell; and the induced draft fan comprises a double-end motor and two induced draft fan wheels. When the double-end motor rotates, air enters from the air inlet hole in the middle of the shell, and enters the first air duct and the second air duct after passing through the corresponding induced draft fan wheels; and two ends of the shell are arranged in the mounting holes of the corresponding back plates, the first air duct outlet communicates with the air guide channel of the air outlet surface shield on the left side of the electric fan, and the second air duct outlet communicates with the air guide channel on the right side of the electric fan. The safe double-end electric fan is small in noises and large in air volume.

The invention provides an air conditioner indoor unit. The air conditioner indoor unit comprises a shell, a first air guide plate and a second air guide plate. An air outlet facing the front lower portion is formed on the shell. The first air guide plate and the second air guide plate are rotationally mounted on the front side and the lower side of the air outlet so as to open and close the air outlet cooperatively. According to the configuration of the second air guide plate, the second air guide plate can rotate to the front air guide state that the second air guide plate is located on the lower side of the air outlet and the air guide face is upward, so that the air supply airflow is guided to the front portion or the front upper portion or the front lower portion; and the second air guide plate can rotate to the downward air guide state that the second air guide plate is located below the first air guide plate and the air guide face is backward, so that the air supply airflow is guided downwards. The air conditioner indoor unit can achieve cold air rising blowing and hot air sinking blowing.

The invention discloses a direct-current induced draft motor. The direct-current induced draft motor comprises a motor shell, and a stator assembly and a rotor assembly which are arranged inside the motor shell. The rotor assembly comprises a rotating shaft on which a vane wheel and a rotor are installed. The motor shell is provided with a columnar body, and an axle hole part for installing the rotating shaft is fabricated in the axis of the columnar body. An annular step is fabricated on the outer edge of the front end face of the columnar body, air guide pieces and supporting bodies which are distributed at intervals are integrally fabricated on the surface of the annular step, the vane wheel is positioned on the inner side of the annular step and is surrounded by each air guide piece. An end cover is fixedly arranged above the motor shell, and an installation position embedded with the supporting bodies is fabricated on the end cover. The inner wall of the end cover is adhered to the upper edges of the air guide pieces. An airflow suction inlet is formed in the center of the end cover, and after an airflow is sucked through the vane wheel, the airflow is discharged out between the outer edge of the end cover and the outer edge of the front end face along air guide passages among the air guide pieces.

The invention discloses a deodorizing system for waste gas in a pig farm, and relates to the technical field of environmental protection. The deodorizing system for the waste gas in the pig farm is applied to a farm with a multistorey building structure; a plurality of piggeries are alternately arranged in the interior of every storey of the building; the interior of each storey of the building isprovided with an air outlet channel communicating with the plurality of the piggeries; air outlet channels of all storeys of the building are in communication; the wall surfaces of one side of the piggeries facing the air outlet channels are provided with a plurality of first fans; the roof of the building is respectively provided with a compartment communicating with the plurality of the air outlet channels and a filter room communicating with the compartment; the wall surface of the compartment close to the filter room is provided with a plurality of second fans; one end of the filter roomfar away from the compartment is provided with a chimney; and a plurality of air filtering devices are alternately arranged in the interior of the filter room located between the plurality of the second fans and the chimney. The deodorizing system for the waste gas in the pig farm provided by the invention has the following advantage: the waste gas in the pig farm is deodorized and discharged intothe atmosphere, so pollution to the atmosphere is reduced.

The invention provides an air guide device, an air guide control method and an air conditioner. The air guide device comprises an air duct assembly connected with a wind wheel assembly, and four cylindrical rotating doors, wherein two wind wheels are arranged in the air duct assembly; the air duct assembly is arranged in a shell in two air outlet areas; the four cylindrical rotating doors are arranged on the shell and located in two middle air outlets and two side air outlets; and each cylindrical rotating door is provided with a ventilating channel of an arc-shaped structure. According to the air guide device, each ventilating channel of the arc-shaped structure is located in the shell or communicated with the inside and the outside of the shell to close or open each middle air outlet or each side air outlet through rotation of each cylindrical rotating door, so that multiple air outlet modes of the air conditioner can be achieved; meanwhile, air outlet range is expanded by the ventilating channels of the arc-shaped structures; a good air outlet effect is ensured; the requirements of a user on fast cooling or heating comfort of the air conditioner can be met; and the usage experience of the user is improved.

The invention provides an air conditioner indoor unit. The air conditioner indoor unit comprises a shell, a first air guide plate and a second air guide plate, wherein the shell is provided with an air outlet facing the front lower portion; and the first air guide plate and the second air guide plate are rotatably installed on the front side of the air outlet and the lower side of the air outlet correspondingly to open and close the air outlet in a coordinating manner, and the second air guide plate is configurated in a front air guide state that the second air guide plate can be rotated to belocated on the lower side of the air outlet and make an air guide face of the second air guide plate face upwards to guide air feeding airflow to the front portion, the front upper portion or the front lower portion and in a lower air guide state that the second air guide plate can be rotated to be located on the rear side of the air outlet and make the air guide face of the second air guide plate face forwards to guide the air feeding airflow to the lower portion. By means of the air conditioner indoor unit, cold air upward blowing and hot air downward blowing can be realized.

The invention discloses an indoor air purification device and belongs to the technical field of air purification equipment. According to the indoor air purification device, forced air supply is conducted through a fan; the extremely high purification effect can be achieved within a short time inside a closed room; meanwhile, three vortex fans are adopted in the device, so that a triangular structure is formed; the indoor air purification device is clear and incomplex in structure; and the three vortex fans work at the same time, the transfer rate is increased, and the problem that a backflow dead area exists inside the device is avoided. Large particles and dust in air are removed through a coarse grid plate and an electrified plate; by means of padding inside a filter screen, poisonous gas can be effectively adsorbed; and meanwhile, activated carbon serves as a carrier, the disinfection effect of an ultraviolet lamp is utilized, and the air is further purified. By means of an inductorand an automatic door, the filter screen in the device can be replaced conveniently; and by means of a switch system, the device on / off time and the blast capacity can be set conveniently. By means of the indoor air purification device, the problems that at present, existing indoor air purification devices are not good in filtration effect, air channels are generally of linear types, so that backflow dead areas exist inside purifiers, and the purification effect is deteriorated are solved.

The invention provides an air conditioner indoor unit. The air conditioner indoor unit comprises a shell, a movable face board and an air guide plate, wherein the shell is provided with one air outletfacing the lower front portion; the movable face board is movably arranged on the shell and is configured to be capable of moving to a closing position located on the front side of the air outlet ormoving to an opening position far away from the front side of the air outlet; and the air guide plate is movably arranged on the shell and is configured to be capable of moving to a first position which is located on the lower side of the air outlet and enables the air guide face of the air guide plate to face upwards when the movable face board is located at the opening position so as to guide air supply flow to the front portion or the upper front portion or the lower front portion, or moving to a second position which is located on the front side of the air outlet to enable the air guide surface to face backwards so as to guide the air supply flow to the lower portion. The air conditioner indoor unit can achieve cold air rising blowing and hot air sinking blowing.

The invention provides an air conditioner indoor unit. The air conditioner indoor unit comprises a shell body, a baffle and an air deflector. The shell body is provided with an air outlet facing the front lower portion. The upper end of the baffle is rotationally mounted on the shell body, a rotary shaft of the baffle is located at the position of the upper edge of the air outlet, and therefore the baffle can rotate to an opening position where the front side of the air outlet is opened or rotate to a closing position where the front side of the air outlet is shielded. The air deflector is rotationally mounted on the shell body and configured to be capable of rotating to a first position which is located on the lower side of the air outlet and enables an air guide surface of the air deflector to be upward, so that when the baffle is at the opening position, air supply airflow is guided to the front portion or the front upper portion or the front lower portion through the air deflector,and the air deflector can be configured to be capable of rotating to a second position which is located below the baffle and enables the air guide surface of the air deflector to be backward, so thatthe air supply airflow is guided to the lower portion. By means of the air conditioner indoor unit, cold air is blown in a rising manner, and hot air is blown in a sinking manner.

The invention relates to the technical field of barbecue equipment and aims at providing a ceramic barbecue furnace with the advantages that an inner wall furnace is not easy to break and fracture, and the charcoal ash is convenient to clear away. The ceramic barbecue furnace comprises a furnace body and a furnace cover, wherein the furnace body and the furnace cover are hinged and are arranged on a trolley bottom frame, the inner wall furnace is arranged in the furnace body, the lower part of the inner wall furnace is provided with a furnace plate, the top of the inner wall furnace is provided with a mesh plate, a buffer is fixed on a circular hoop arranged at the circumference outside the furnace body and near the opening, the circular hoop is movably connected with a side plate, and the lower part of the furnace body is provided with a furnace door. The ceramic barbecue furnace is characterized in that the side wall of the inner wall furnace is provided with a breaking prevention gap or a breaking prevention groove penetrating through the upper end and the lower end in the vertical direction, the ceramic barbecue furnace also comprises an ash bucket and a ventilation regulator, the ash bucket is fixedly connected with the ventilation regulator, when the ceramic barbecue furnace is used, the ash bucket passes through the furnace door and is inserted into the lower part of the furnace plate, and the ventilation regulator is in contact with the furnace door and seals the furnace door. The inner wall furnace of the ceramic barbecue furnace is not easy to break and fracture, and the charcoal ash is convenient to clear away.

The invention discloses a blade-free double-head fan which comprises an air sucking assembly, two air outlet covers and an electric cooling plate. Each air outlet cover comprises a face plate and a back plate, an air outlet slot is formed in the face plate, an installing hole is formed in the center position of the back plate, and an air guiding channel is arranged between the face plate and the back plate. The air sucking assembly comprises a casing, a suction fan arranged in the casing and a first air channel and a second air channel which are arranged in the casing. A mesh plate serving as an air inlet hole is arranged in the middle of the casing, a first air channel outlet is arranged in the left end of the casing, and a second air channel outlet is arranged in the right end of the casing. Two ends of the casing are arranged in the installing hole of a corresponding back plate, the first air channel outlet is communicated with the air guiding channel of the air outlet cover on the left side, and the second air channel outlet is communicated with the air guiding channel of the air outlet cover on the right side. The electric cooling plate is arranged in the casing and arranged between the two back plates and is adjacent to the mesh plate. The blade-free double-head fan is small in noise, large in air volume and capable of blowing cold air.

The invention relates to a steaming and baking integrated machine which comprises an inner container and an air heater; a hot air baffle is arranged on the rear side of the inner container, a hot air chamber is defined by the hot air baffle and a back plate of the inner container; hot air fan blades of the air heater are installed in the hot air chamber, and an adjusting check ring is arranged on the periphery of the hot air fan blades. The adjusting check ring is formed by at least two adjusting plates arranged in the front-back direction in a surrounding mode in the circumferential direction; each adjusting plate can rotate, and the adjusting check ring at least has the following two states: in the first state, the two ends of each adjusting plate are spliced with the corresponding ends of the adjacent adjusting plates correspondingly, and the adjusting check ring forms a closed ring body; and in the second state, the two ends of each adjusting plate are separated from the corresponding ends of the adjacent adjusting plates respectively. According to the steaming and baking all-in-one machine, the hot air volume in the inner container can be adjusted, so that the optimal baking effect can be achieved; outlet air of the hot air fan blades can form laminar flow through the flow guide effect of the adjusting plates, so that the hot air circulation efficiency of the hot air chamber is improved, and the cooking efficiency of the steaming and baking all-in-one machine is improved.

This invention relates to a kind of lighter comprising: a housing, a storage, a outlet control bar, at least an ignition chamber, at least an igniter and a head cover, characterized in that it also includes a middle seat for supporting said ignition chamber, and said inlet valve is provided on the side of outlet valve of said storage, and on the valve core of said inlet valve there is provided with a rotatable gear adjustment mechanism engaging with a gear provided on the case of said outlet valve. Such a structure may easily adjust the amount of gas as outlet and is simple in structure and may not affect use after injection of gas thereinto.

The invention discloses a 360-degree fan turbine device with the optimized pneumatic performance. The turbine device comprises a rotary shaft for connecting a turbine with a working motor, blades, a flat plate, a motor fixing rack and a base, wherein the turbine is covered by a netty outer cover; the blades are circumferentially mounted on the rotary shaft at an equal interval and directly connected with the flat plate; the turbine is connected with the motor through a rotary shaft; the motor is correspondingly fixed to the motor fixing rack; the motor fixing rack is fixed in the base. The turbine device is improved, namely a flow guide plate with the impact reduction performance, a toothed structure and a stepped structure are improved to improve the pneumatic performance of the 360-degree fan. The turbine device has the characteristics of efficient pneumatic performance, low noise and the like.

The invention discloses a fan blade and a fan with the same. The fan blade comprises a hub and at least one blade. The at least one blade is arranged in the circumference of the hub. Cross sections parallel to the center axis of the hub intersect with a suction surface and a pressure surface of each blade to form first intersecting lines and second intersecting lines respectively. A connection line of a center of a circle where each first intersecting line and each second intersecting line are tangent to the circle simultaneously is an airfoil profile mean line, and each cross section is a plane or a cylindrical surface. At least one half of at least one of each first intersecting line, each second intersecting line and each airfoil profile mean lines forms a sinusoidal curve. According to the fan blades, the sinusoidal curve is utilized to design the blades, so that the blades having good performance can be obtained conveniently, the blast capacity and the energy efficiency of the fan blades can be improved, and the outlet air of positive and reverse rotation of the fan blades can be achieved. In addition, the surface of each blade is smooth, the continuity is good, the high frequency noise can be effectively controlled, the running noise is reduced, and the whole performance of the fan blades is improved.

The invention relates to the technical field of fans, in particular to a fan head and a cooling fan, and the fan head comprises an air inlet grille structure which is hemispherical and comprises a plurality of arc-shaped ribs distributed in a radial shape; the air duct assembly comprises an air duct, a main motor arranged in the air duct and fan blades connected with the main motor, and the fan blades comprise a plurality of blades; on a projection plane perpendicular to the axis of the main motor, the included angle between the tangent line, at the front edge of the blade, of the intersection point of the front edge of the blade and the arc-shaped rib and the tangent line, at the arc-shaped rib, of the intersection point of the front edge of the blade and the arc-shaped rib is alpha, and alpha is gradually reduced from the root of the blade to the end of the blade.

The invention relates to a centrifugal fan and a refrigerator using the fan. The centrifugal fan comprises a chassis, an inner hub and a plurality of blades, wherein the inner hub is fixedly arranged in the middle of the chassis, the blades are distributed around the inner hub and are fixedly arranged on the chassis, one end, near the inner hub, of each blade is provided with an inner circle end, one end, away from the inner hub, of each blade is provided with an outer circle end, the blades are distributed from the inner circle ends to the outer circle ends, the axial height of the fan is gradually reduced from the top of each blade in the axial direction of the fan to the direction of the chassis, and the distance from the height reduction initial position of each blade in the axial direction of the fan to the axis of the inner hub is equal to 74% to 81% of the radius length of the fan. The centrifugal fan has the advantages that the structure is simple; the axial height of the outer circle end of each blade is reduced, and the pressure on the outer circle end of each blade is reduced, so the noise is reduced; according to the proof by experiments, the effect of the height reduction initial position at the 74% to 81% of the fan radius is better.

The invention provides an alloy powder material, a preparation method of the alloy powder material and application of the alloy powder material in a seawater corrosion resistant laser cladding material. The material comprises the following raw materials in percentage by mass: 38-45% of Ni, 3-6% of Al, 4-8% of W, 0.5-1.5% of Fe, 0.5-1.5% of Mn, 0.5-1% of Sb and the balance of Cu. The total amount of other impurity elements in the material is smaller than or equal to 0.15%. During preparation, raw material powder is weighed according to the proportion, Cu is heated and melted, then Ni is added, other raw materials are added after Cu and Ni are completely melted, molten alloy melt is obtained, the molten alloy melt is poured into a crucible of an atomization rapid condensation device, atomization powder making and screening are conducted through the device, and the alloy powder material is obtained. The alloy powder material is applied as a seawater-corrosion-resistant laser cladding material and can be metallurgically bonded with a to-be-protected workpiece, so that the corrosion-resistant life is greatly prolonged.