359results about How to "Improve air supply efficiency" patented technology

The invention provides an indoor unit of a vertical air conditioner. The indoor unit comprises a machine shell, a heat exchanger, a first cross flow fan and a second cross flow fan; the heat exchange is arranged in the machine shell; the first cross flow fan and the second cross flow fan are arranged up and down in the machine shell, vertically extend along an axis and are arranged collinearly; the machine shell comprises a framework, a bottom plate, a front upright post, a rear upright post, a left upright post, a right upright post and a shell; the framework is used for mounting the heat exchanger, the first cross flow fan and the second cross flow fan; the bottom plate is arranged below the framework and is used for supporting the indoor unit of the vertical air conditioner; the front upright post and the rear upright post respectively extends upwards from the front and rear sides of the bottom plate to the bottom end of the framework to support the framework; the left upright post and the right upright post respectively extend upwards from the left and right sides of the bottom plate to the top end of the framework to fix the framework; and the shell surrounds the outer side of the framework, the lower end of the shell extends to the edge of the bottom plate, a plurality of air outlets are formed in the front side of the shell, and an air inlet is formed in the rear side of the shell. The indoor unit of the vertical air conditioner, provided by the invention, is relatively low in fan air pressure loss and capable of saving more energy during operation and has various air supply modes, so that the user experience is improved.

The invention discloses a combined air deflection assembly which comprises a mounting shell, at least one first air deflector, at least one second air deflector, at least one upper air deflector, at least one lower air deflector and a driving assembly, wherein the at least one first air deflector is arranged on the mounting shell along the left-and-right direction; the at least one second air deflector is arranged on the mounting shell along the left-and-right direction in a mode of synchronously swinging left and right; the at least one second air deflector is positioned in the front side of the at least one first air deflector and is staggered with the at least one first air deflector; the at least one upper air deflector is vertically arranged at the upper part of the corresponding first air deflector; each upper air deflector is inclined forwards and upwards and is at an included angle alpha with the horizontal plane; the at least one lower air deflector is vertically arranged at the lower part of the corresponding first air deflector; each lower air deflector is inclined forwards and downwards and is at an included angle beta with the horizontal plane; the driving assembly is used for driving the second air deflectors to swing synchronously. The combined air deflection assembly has high air deflection efficiency, low wind resistance and a large air supply range. The invention also discloses a vertical air conditioner.

The invention provides a vertical air conditioner indoor unit. The indoor unit comprises a machine shell, a plurality of air outlets are vertically formed in a front panel, and the rear side of the machine shell is provided with an air inlet; a heat exchanger is arranged in the machine shell, a first cross flow fan and a second cross flow fan are vertically arranged in the machine shell, the axes vertically extend, the first cross flow fan and the second cross flow fan are collinear, and therefore the air is promoted to enter the machine shell via the air inlet and is subject to heat exchange with the heat exchanger to be blown out of the corresponding air outlet; an air flue assembly is erected on the circumferential outer sides of the first cross flow fan and the second cross flow fan so as to enable air to be led to the air outlets forwards from the heat exchanger, an air flue partition part is mounted on the air flue assembly and is located between the first cross flow fan and the second cross flow fan, space limited by the air flue assembly is partitioned into an upper portion and the lower portion, the first cross flow fan and the second cross flow fan are contained in the upper portion and the lower portion correspondingly, and the air flue partition part is provided with two bearings matched with a rotating shaft of the first cross flow fan and a rotating shaft of the second cross flow fan correspondingly. According to the indoor unit, the air flue assembly can be simplified, and the influence of the air flue assembly on the heat exchange efficiency of the heat exchanger can be reduced.

The invention provides a branch air supply device and a refrigerator. The branch air supply device comprises a shell, a plurality of baffles, a plurality of transmission components, a driving device and a gear position sensing device. The shell comprises a plurality of air supply outlets; each baffle is installed at one air supply outlet; each transmission component is provided with a second transmission member and a second transmission mechanism; a first drive mechanism is configured to transfer the rotary motion of the corresponding second transmission member to the baffles; the driving device comprises a drive source and the first drive mechanism, the first drive mechanism is configured to transfer a motion output from the drive source to the second transmission member, and the first drive mechanism is provided with a first transmission member; and the gear position sensing device is configured to detect the position of the first transmission member when the rotation stops so as todetermine the air outlet status of each air supply outlet according to the position of the first transmission member when the rotation stops. Cool air can be reasonably distributed to enhance the fresh-keeping performance and operating efficiency of the refrigerator; and the control is simple, the adjustment is convenient, the adjustment speed is high, and the adjustment accuracy is high.

The invention discloses a ventilation system and a ventilation method for single-cavern large-section extra-long tunnel construction. The ventilation system comprises a construction ventilation temporary partition (2) arranged on one side of a center line of a tunnel; a ratio of a sectional area of a sealed roadway formed by the construction ventilation temporary partition (2) and one side wall of the tunnel to a sectional area of a sealed roadway formed by the construction ventilation temporary partition (2) and the other side wall of the tunnel is close to 2:1; the sealed tunnel with the smaller sectional area is taken as a fresh air intake airway (4); polluted air returned from a tunnel face is discharged out of the tunnel through a polluted air discharging roadway (5) with the larger sectional area; at the outlet of a tunnel portal, the construction ventilation temporary partition (2) extends out of the portal to separate fresh air from polluted air in an area close to the portal. A jet flow tunnel ventilation mode is adopted, the difficult problem of extra-long-distance air supply during the single-cavern large-section extra-long tunnel construction is solved, the air supply efficiency for the tunnel face is effectively improved, the cost is saved, and a better economic benefit is achieved.

The invention relates to an air conditioner indoor unit. The air conditioner indoor unit comprises ion wind generating devices and purifying devices. The ion wind generating devices are arranged on flowing paths, from a fan assembly to air outlets, in a unit shell, and air subjected to heat exchange through a heat exchange device is promoted by electric field force to flow to the air outlets through an air duct of the fan assembly. Each purifying device is arranged on the flowing path from the corresponding ion wind generating device to the corresponding air outlet and used for removing nitric oxide and ozone in air. The purifying devices are arranged outside the corresponding ion wind generating devices. Since high-voltage discharging devices are arranged inside the ion wind generating devices, a certain amount of harmful gas, mainly O3 and NO2, is generated in the working process of the ion wind generating devices, and in order to prevent the harmful gas from affecting physical health of users after being exhausted from the air conditioner indoor unit, the purifying devices are arranged outside the corresponding ion wind generating devices to remove the harmful gas and improve the air cleanliness.

The invention discloses an air conditioner. The air conditioner comprises a shell, a partition plate and a fan assembly, wherein the shell is provided with an air duct, the shell comprises a front panel and a back plate, and an air inlet communicating with the air duct is formed in the back plate. The partition plate can be movably installed in the air duct up and down, the partition plate dividesthe air inlet into an upper air inlet area and a lower air inlet area, and meanwhile the partition plate divides the air duct into a first air cavity and a second air cavity which are distributed inan up-down direction. The upper air inlet area communicates with the first air cavity, and the lower air inlet area communicates with the second air cavity. A first air outlet communicating with the first air cavity and a second air outlet communicating with the second air cavity are formed in the front panel. The fan assembly comprises a first fan and a second fan, the first fan is arranged in the first air cavity and corresponds to the first air outlet, and the second fan is arranged in the second air cavity and corresponds to the second air outlet. According to the technical scheme, the situation that air snatching occurs when the two sets of fans runs at the same time is effectively avoided, and meanwhile, air supply efficiency of the two sets of fans and the heat exchange efficiency of a heat exchanger are further improved.

An air supply system on a vehicle for inflating and deflating a tire. The system includes a compressor connected to a drier having drying material to extract water from the air and a deflation line connectable between the tire and the dryer. The air dryer is operable in a first mode in which air passing through the dryer in a first direction is dried by the dryer and a second regeneration mode in which air passes through the dryer in a direction opposite to the first to remove water collected by the dryer, characterized in that the air used for the regeneration is air deflated from the tire.

The invention relates to a far range air supply type mist spray purification device. The device comprises a machine seat and a main control platform, wherein an air supply device and a mist spray device are arranged on the machine seat; the air supply device is provided with a base; a rotating vertical column is arranged in the center of the base; a supporting plate is fixed at the upper end of the rotating vertical column; the lower end of the rotating vertical column is in power connection with a driving mechanism; an air cylinder is fixed on the supporting plate; a pressure diffusion throat pipe is arranged on the inner side of an air outlet of the air cylinder; the tail end of the air outlet of the air cylinder is connected with a backflow cover; a high-pressure axial flow fan is arranged in the center of the air cylinder; the mist spray device comprises an annular distribution pipe, a radial plunger pump, a motor and a water tank; an atomizing nozzle is arranged on the annular distribution pipe; a liquid absorption opening of the radial plunger pump is communicated with a water supply opening of the water tank through a liquid inflow pipeline; and a liquid outlet of the radial plunger pump is communicated with the annular distribution pipe through a liquid outflow pipeline. The device has a far mist spray range and low energy consumption, particularly can control the sizes of atomized fog drops effectively and has good dust removing and temperature reducing effects.

The invention provides a branching air supply device and a refrigerator. The branching air supply device comprises a shell, multiple baffles, multiple transmission assemblies and a driving device. Theshell is provided with a circumferential wall portion which is provided with multiple air supply ports, each baffle is rotationally installed on one air supply port, each transmission assembly is provided with a rotating part and a first transmission mechanism, each first transmission mechanism is arranged to transfer rotary motion of the corresponding rotating part to one baffle so as to enablethe baffle to be static or rotated, the driving device is provided with a driving source and a second transmission mechanism, and the second transmission mechanism is arranged to transfer one motion output by a driving source to the multiple rotating parts so as to enable each rotating part to be static or rotated. The flow path and quantity of cold air can be conveniently adjusted in a unified mode, cold air is reasonably allocated, the preservation performance and operation efficiency of the refrigerator are improved, control is easy, adjustment is convenient, the adjusting speed is high, and adjusting accuracy is high.

The invention provides a branching air feeding device and a refrigerator. The branching air feeding device comprises a shell, a plurality of baffles, a plurality of transmission assembles and a driving device; the shell is provided with a peripheral wall part, and a plurality of air feeding openings are formed in the peripheral wall part; and each baffle is rotationally installed at one air feeding opening, each transmission assembly is provided with a rotating gear and a first transmission mechanism, each first transmission mechanism is allocated to transfer rotary motion of the correspondingrotating gear to the corresponding baffle, and therefore the baffle is static or rotates; and the driving device is provided with an inner gear ring, each rotating gear is installed in the inner gearring and is meshed with the inner gear ring, so that the multiple rotating gears can be driven to rotate while the inner gear ring rotates. In this way, the flowing way and the flow of cold air can be adjusted in a unified manner, the cold air is reasonably allocated, and the freshness keeping property and the running efficiency of the refrigerator are strengthened; and control is simple, adjustment is convenient, the adjusting speed is high, and the adjusting accuracy is high.

The invention aims discloses a refrigerator and aims to improve the air supplying efficiency by using a baffle device and improve the energy saving performance. The refrigerator is provided with a first frame of a first opening sending cool air to a first air supply channel; a second frame of a second opening sending cool air to a second air supply channel; a first and a second cover respectively open or close the first and the second opening; and a drive mechanism disposed between the first frame and the second frame and driving the first cover ant the second cover. A first drive shaft is disposed on one side of the first cover, and a second drive shaft is disposed on an opposite side of the first cover. The upper end of an air supplier is disposed below an intersection point of the rotation paths of the first cover and the second cover and above the lowest point of the rotation paths of the first cover and the second cover.

An air draft apparatus of tight spin includes a cotton sucking wind pipe, an aggregation tube, a cotton sucking flute pipe and a multichannel connecting pipe, wherein, channels at one side of the multichannel connecting pipe are connected to the cotton sucking wind pipe, one of channels at the other side of the multichannel connecting pipe is connected to the cotton sucking flute pipe, and the other channels are connected to the aggregation tube. The invention possesses the advantages of organically and slickly combining the cotton sucking flute pipe and the cotton sucking wind pipe in the existing ring spinning frame air draft apparatus together with the aggregation tube required by the tight spin; obtaining an air draft apparatus with simple structure; meanwhile being capable of full utilizing the existing air draft apparatus; and having convenient reconstruction, few investment, high economic benefit, high air supply efficiency, low noise and good working atmosphere.

The invention provides a vertical type air conditioner indoor unit. The vertical type air conditioner indoor unit comprises a unit shell, a heat exchanger, at least one cross-flow fan, a wind guiding device and at least one swinging blade assembly. At least one circular wind outlet is formed in a front face plate of the unit shell, and a wind inlet is formed in the back side of the unit shell. The heat exchanger is arranged in the unit shell. The cross-flow fans are arranged for promoting air to penetrate through the wind inlet to enter into the unit shell, and the air is blown out of the wind outlets after the air is exchanged heat by the heat exchanger. The wind guiding device is provided with a frame arranged on the inner side of the front face plate. The swinging blade assemblies are in one-to-one fit with the wind outlets. Each swinging blade assembly comprises a plurality of swinging blades which are installed on the frame in a pivoted mode correspondingly and are parallel to each other in the longitudinal direction, and is arranged for making all of the swinging blades synchronously change the wind-out directions of the wind outlets in a pivoted mode. A wind-out structure of the vertical type air conditioner indoor unit is novel and unique, and facilitates designing and installing of the swinging blades.

The invention discloses an indoor unit of an air conditioner. The indoor unit comprises a shell and an air guide assembly. The shell is provided with an air inlet, an air outlet and an air flue located between the air inlet and the air outlet. The air guide assembly is arranged in the air flue or at the air outlet and comprises a lower air guide plate and louvers, and the louvers are arranged on the lower air guide plate and rotationally connected with the lower air guide plate. In the indoor unit of the air conditioner, when the lower air guide plate swings to guide airflow generated after heat exchange to flow up and down, the louvers rotate relative to the plate face of the lower air guide plate so as to guide the airflow to flow left and right, and therefore the airflow generated after heat exchange is fast and stably conveyed to an area specified by a user, that is, coupling air supply is achieved through coupling movement of the lower air guide plate and the louvers, and the air supply efficiency of the indoor unit of the air conditioner is greatly improved.

The invention relates to an air stop sheet retainer, a branching air supply device and a refrigerator. Specifically, the invention provides an air stop sheet retainer. The air stop sheet retainer comprises a first sealing element and a second sealing element, wherein the first sealing element is in the shape of a flat plate, and a plurality of first holes are formed in the first sealing element; the second sealing element is arranged at one side of the first sealing element and provided with a main sealing part and two bending parts; the main sealing part is in the shape of a flat plate and provided with a plurality of second holes aligned with the multiple first holes respectively; and each bending part extends out from one end of the main sealing part to a direction away from the first sealing element. The invention further provides a branching air supply device with the abovementioned air stop sheet retainer, and a refrigerator with the air stop sheet retainer. The air stop sheet retainer is capable of effectively enabling an air stop sheet to move smoothly, high in arrival rate, capable of ensuring the smoothness of the air stop sheet, capable of preventing air leakage between two air outlets, good in sealing effect, and capable of ensuring that the branching air supply device can carry out effective adjustment on air paths and / or an air quantity.

The invention provides a branching air supply device and a refrigerator. The branching air supply device comprises a shell, multiple baffles, multiple transmission assemblies and a drive device. The shell is provided with a peripheral wall portion, and multiple air supply openings are formed in the peripheral wall portion. Each baffle is rotationally mounted at one corresponding air supply opening. Each transmission assembly is provided with a rotating gear and a first transmission mechanism. Each first transmission mechanism is configured to transmit rotating motion of the corresponding rotating gear to the corresponding baffle. One rotating gear is engaged with another rotating gear so that rotation of the corresponding rotating gear can be transmitted to the multiple rotating gears. Theconnecting lines of the projections of the rotating axes of the multiple rotating gears in the reference plane perpendicular to the rotating axes form a polygon. The drive device is provided with a drive gear, and the drive gear is engaged with one rotating gear. Cold air can be conveniently distributed reasonably, and the freshness keeping performance and operation efficiency of the refrigeratorcan be enhanced; and control is simple, adjustment is convenient, the adjusting speed is high, and adjusting accuracy is high.

The invention discloses a washing machine and a tub drying method thereof. The washing machine comprises a dehydration tub and an air supply device, wherein the dehydration tub is used for containing washings to be dehydrated, the end face of one axial side is open, the dehydration tub can rotate around the central axis of the dehydration tub, an air supply port of the air supply device faces the open end face of the dehydration tub and is used for heating airflow and blowing the heated airflow into the dehydration tub through an air supply outlet. According to the washing machine, the risk of dirt and bacterium remaining due to accumulated water in the tub can be effectively reduced, mildew is decreased, and the cleaning degree of the washing machine is improved. In addition, the air supply port of the air supply device faces the open end face of the dehydration tub, accordingly the air supplying efficiency can be effectively improved, the installing difficult of the air supply device can be reduced, the tub is comprehensively dried, and formation of the accumulated water is completely eradicated fundamentally to effectively avoid the water accumulation problem.

The invention discloses an air conditioner outdoor unit with an inclined centrifugal fan and an air conditioner and relates to the air conditioner technical field. The air-in and air-out directions of the air conditioner outdoor unit can be changed; the influence on outdoor environment is reduced; and air-in and air-out angles are made to be wider; the heat exchange performance of the air conditioner outdoor unit is improved. The problems of the big influence on the outdoor environment, the small air supply volume and the low efficiency of an air conditioner outdoor unit in the prior art are solved. The inclined centrifugal fan comprises an upper hub, a lower hub and vanes arranged between the upper hub and the lower hub. The tops of the vanes are connected with the upper hub, and the root portions of the vanes are connected with the lower hub. The edges, close to the circle centers of the upper hub and the lower hub, of the vanes are the air-in edges of the vanes, and the edges, far away from the circle centers of the upper hub and the lower hub, of the vanes are the air-out edges of the vanes. The side, close to the lower hub, of the inclined centrifugal fan is the air-in side; the side, close to the upper hub, of the inclined centrifugal fan and the outer sides of the air-out edges are air-out sides. The diameter of the lower hub is bigger than the diameter of the upper hub.

The invention belongs to the field of solid waste treatment, in particular relates to sludge drying equipment based on drying treatment of urban sludge. The sludge drying equipment comprises a drum with an inclined axis, and a driving assembly for driving the drum to rotate along the axis of the drum, wherein the drum is provided with an accommodating cavity for accommodating sludge; the accommodating cavity is arranged in the axial direction of the drum and in a penetrating manner; the feeding end of the accommodating cavity is arranged at the high end part of the drum, and the discharging end of the accommodating cavity is arranged at the lower end part of the drum; the sludge drying equipment further comprises heat supply pipes for supplying heat to the accommodating cavity; the heat supply pipes are arranged in the accommodating cavity; two or more heat supply pipes are arranged in the axial direction of the accommodating cavity; air vent holes communicated with the cavities of the heat supply pipes and the accommodating cavity are formed in the walls of the heat supply pipes. The heat supply pipes of the invention are used as stirring pipes of the whole accommodating cavity while performing the functions of supplying heat and drying. The sludge drying equipment has the advantages of simple structure, easy and reliable operation, effective achievement of purpose of drying existing wet sludge and extremely-high drying efficiency.

The invention provides a blowing burner and a gas stove. The blowing burner comprises a burner assembly and a blower assembly, wherein the burner assembly comprises burner heads and gas distribution discs, the gas distribution discs are located above the burner heads and connected with the burner heads, each gas distribution disc is provided with multiple gas distribution channels, the cross sectional areas of at least two gas distribution channels of the multiple gas distribution channels are not the same, and the blower assembly is connected with the burner heads and used for leading air into the burner heads. According to the technical scheme, the gas flow of all the channels can be the same by changing the cross sectional areas of the channels on the gas distribution discs, therefore, gas can be fully burnt, and even heating can be achieved; meanwhile, air doors are arranged between the blower assembly and the burner heads, and the air which enters the burner heads can be accurately controlled, so that the proportion of the gas amount and the air amount of the burner heads can be moderate, and the sufficient burning of the gas can be guaranteed; in addition, the air amount in a blower can be controlled by using a stepless speed regulation device, and therefore the air amount can be changed continuously and evenly.

A circulator (1) which is mounted on a side wall (S) in a room or on a ceiling wall (T) located close to the side wall (S) in a room and which circulates air present in the room. The circulator (1) comprises, in order from a first wall surface (P1) adjacent to the side wall (S) in the horizontal direction, a first outlet (4a), a second outlet (4b), and a third outlet (4c) which are disposed next to each other in the horizontal direction. A first air flow (A1) which flows along the ceiling wall (T) and descends along the first wall surface (P1) is delivered from the first outlet (4a), a second air flow (A2) which flows along the ceiling wall (T) and descends along a second wall surface (P2) facing the side wall (S) is delivered from the second outlet (4b), and a third air flow (A3) which flows along the ceiling wall (T) and descends along a third wall surface (P3) facing the first wall surface (P1) is delivered from the third outlet (4c)

The invention discloses an air conditioning indoor unit and an air conditioner with an air conditioning indoor unit. The air conditioning indoor unit comprises a shell body, which is provided with an air supply opening and an air returning opening; an air guide ring, which is arranged at the air supply opening for adjusting the air supply direction; a driving component, which is connected with the air guide ring, and drives the air guide ring to crossly sway and / or vertically sway; an indoor heat exchanger, which is arranged in the shell body; a blower component, which is arranged in the shell body. The air conditioning indoor unit can greatly increase the air supply scale thereof by arranging the air guide ring which can sway along cross and vertical directions, and air flow can be blown to any zone in front of the shell body, and thereby the dead corner of the air supply in the room is effectively solved, the comfort level of the air conditioning indoor unit is added, time from the indoor temperature to the preset temperature is shortened, and energy consumption of the air conditioning indoor unit is reduced.

The invention relates to an indoor unit of an air conditioner. The indoor unit comprises ion wind generating devices and purifying devices. Each ion wind generating device is arranged on a flow path from a fan assembly to an air outlet in a machine shell, and air subjected to heat exchange through a heat exchange device is promoted by an electric field force to flow towards the air outlet through an air duct of the fan assembly. Each purifying device is arranged on a flow path from each ion wind generating device to the corresponding air outlet and is configured to remove ozone in the air. The purifying devices of the indoor unit are arranged at the outer sides of the ion wind generating devices. High-voltage discharging devices are arranged inside the ion wind generating devices, so that a certain amount of harmful gases mainly comprising O3 can be generated in the working processes of the ion wind generating devices. In order to avoid the phenomenon that the O3 gases are discharged from the indoor unit of the air conditioner to affect the body health of a user, the outer side of each ion wind generating device is provided with one of the purifying devices, so that the harmful gases are removed, and meanwhile, the air cleanliness is improved.

The invention discloses an air purifying device which comprises a filter located at the bottom of the air purifying device. A shell is arranged above the filter. A pumping air supply mechanism is arranged in the shell. An air outlet is formed in the top of the shell. After passing through the filter under the effect of the pumping air supply mechanism, air enters the shell from the bottom, passes through an air channel formed in the shell, and is exhausted from the top of the air purifying device. The pumping air supply mechanism comprises a pumping mechanism and an air supply mechanism. The air purifying device has the advantages that the pumping direction and the air supply direction of the air purifying device are consistent, the pumping efficiency and the air supply efficiency are high, the purification efficiency is high, the purification ability is high, and the air is purer.

The invention provides a vertical air-conditioning device. The vertical air-conditioning device comprises a cabinet body, a main air duct, an auxiliary air duct, a diversion structure and a pluralityof axial-flow fans, wherein the cabinet body comprises a first shell and a second shell which are arranged in an opposite mode, an air inlet is formed in the first shell, and an upper air outlet and alower air outlet are formed in the second shell; the main air duct and the auxiliary air duct which communicate with each other are arranged in the cabinet body; the diversion structure is arranged at the communicating position of the main air duct and the auxiliary air duct and used for closing an air inlet of the auxiliary air duct when the vertical air-conditioning device is in a refrigerationmode and opening the air inlet of the auxiliary air duct when the vertical air-conditioning device is in a heating mode; and the axial-flow fans are horizontally arranged in the axial direction, positioned in the main air duct, correspondingly arranged with the air inlet and the upper air outlet in an opposite mode, and used for inhaling air into the cabinet body from the air inlet, discharging air after the refrigeration treatment from the upper air outlet through the main air duct or discharging the air after the heat treatment from the upper air outlet and the lower air outlet through themain air duct and the auxiliary air duct simultaneously. According to the vertical air-conditioning device, the speed of temperature regulation and the operation efficiency of the device are effectively improved.

This invention discloses an air-feeding device used in air-condition including the following parts: a fan shell made of plastics, an air-feed fan mounted in the shell, a shaft connected with the fan shaft and transferring the drive force of the motor to the fan, a stator fixedly set at the outside of the shell and keeping concentricity with it and a rotor connected with the shaft directly. This invention uses a brushless DC motor to drive the fan stably and increase feeding volume and reduce generation of noises.