CN207315689U

CN207315689U - Electric fan and there is its dust catcher

Info

Publication number: CN207315689U
Application number: CN201721361966.3U
Authority: CN
Inventors: 胡小文; 张辉; 明乐乐
Original assignee: Midea Group Co Ltd
Current assignee: Midea Group Co Ltd
Priority date: 2017-10-19
Filing date: 2017-10-19
Publication date: 2018-05-04
Anticipated expiration: 2027-10-19

Abstract

The utility model discloses a kind of electric fan and there is its dust catcher, electric fan includes：Shell；Multi-stage impeller component, multi-stage impeller component are all provided with inside the shell, and every grade of impeller assembly includes impeller and the diffuser for being located at impeller downstream；At least one return channel, return channel are located between adjacent both stage impellers component.Electric fan according to the present utility model, has higher efficiency, while low noise, improves the usage experience effect of user.

Description

Electric fan and there is its dust catcher

Technical field

Household electrical appliance technical field is the utility model is related to, more particularly, to a kind of electric fan and there is its dust catcher.

Background technology

Dust catcher is increasingly popularized as household electrical appliance in the modern life, is especially almost house in developed countries such as America and Europes Family's indispensable living electric apparatus in every family.Although dust catcher comes out more than 100 years as a kind of ripe household electrical appliance, however, it is made an uproar Sound and power consumption are always to perplex the key technical problem of user, and the charging type vacuum cleaner especially developed in recent years is even more so, The problems such as huge noise, frequent charging times and shorter service life, is still difficult to effectively solve.

Electric fan is the main power source of dust catcher, electric fan is providing as one of most crucial component in dust catcher While condition of high vacuum degree needed for dust catcher, and it is the dominant noise source and source of power consumption of dust catcher, so as to reduce making an uproar for electric fan Sound and power consumption are that cleaner technology develops an eternal theme.

In correlation technique, there are problems with for electric fan：(1) electric fan is vacuumized using single-stage impeller, in the same terms Under, when needing to realize identical vacuum, the running speed of electric fan is higher, and passage is close to 30,000 turns so that electric fan is made an uproar Sound is larger, can generally exceed 100dB (A)；(2) electric fan currently on the market is distinguished by the pattern of its motor, is mainly had at present The most popular BLDC motors that 110,000 turns are gone to using the electric fan of series excited machine and the 60000 of use last decade exploitation The electric fan of (Brushless Direct Current Motor, brshless DC motor), wherein the electric wind using series excited machine Machine can be divided into band chassis cover and without two class of chassis cover, be primarily adapted for use in high-speed working condition using the electric fan of BLDC motors, no Any class electric fan is managed, is required to flow through motor by the impeller-driven air of electric fan to cool down motor, and it is most of Electric fan first pressurizes cold air, so that the temperature of air is improved, usually when producing more than ten kPas of vacuum, sky Temperature degree can improve 20 DEG C or so, and the higher air of temperature enters electric wind by the catwalk that return channel blade and shell are formed The rotor and coil inside of electromechanical machine so that the heat convection effect between air and motor is poor, causes the work temperature of motor Degree is higher, has seriously affected the service life of motor, has even resulted in less than 500 hours of service life of electric fan；(3) electric wind There is no elbow structure between the diffuser and return channel of machine, the root of return channel inlet reflux blade when causing air half-turn Portion produces larger recirculating zone, causes incidence loss larger at return channel blade inlet so that electric fan it is less efficient.

Utility model content

The utility model is intended at least solve one of technical problem existing in the prior art.For this reason, the utility model carries Go out a kind of electric fan, the electric fan is efficient, low noise.

The utility model also proposes a kind of dust catcher with above-mentioned electric fan.

According to the electric fan of the utility model first aspect embodiment, shell；Multi-stage impeller component, the multistage impeller sets Part is each provided in the shell, and every grade of impeller assembly includes impeller and the diffuser for being located at the impeller downstream；At least one A return channel, the return channel are located between impeller assembly described in adjacent two-stage.

According to the electric fan of the utility model embodiment, by setting multi-stage impeller component and every grade of impeller inside the shell Component includes impeller and diffuser, and electric fan can realize required vacuum with relatively low working speed, so as to substantially change It has been apt to the abrasion condition of the carbon brush of the vibration of electric fan, heat condition and electric fan, while has improved the pneumatic of electric fan and make an uproar Sound and vibrating noise, have been obviously improved the reliability of electric fan, realize electric fan efficiently, low noise operation, improve user's Experience effect.

Some embodiments according to the present utility model, the diffuser are included along the circumferentially spaced more of the impeller A diffusion blade, multiple diffusion blades are located at the radial outside of the impeller, and the return channel is included along the impeller Circumferentially spaced multiple reflux blades, are equipped with bend part between the diffuser and the return channel, the bend part There is bend face towards a side surface of the shell, the bend face is located at the outer end of multiple diffusion blades and multiple institutes Between the outer end for stating reflux blade, the bend face is formed as smooth curved surface.Thus, the effect of electric fan is further improved Rate.

Some embodiments according to the present utility model, the bend face are formed towards the cambered surface of the shell protrusion, from And facilitate the shaping in bend face.

Some embodiments according to the present utility model, on the longitudinal cross-section of the electric fan, the direction of the bend part Minimum range between one side surface of the shell and the internal face of the shell is L, a diameter of d in the bend face, institute State L, d satisfaction：2×L/3≤d≤2×L.Thus, the uniformity of return channel passage interior air-flow is further improved, is saved at the same time The occupied space of electric fan, facilitates the processing of bend part.

Some embodiments according to the present utility model, at least one in the diffuser and the return channel are connected to institute State on bend part, so as to facilitate the assembling of electric fan.

Some embodiments according to the present utility model, are equipped with motor in the shell, in the multistage impeller assembly extremely Few level-one is located at the downstream of the motor, so as to effectively reduce the operating temperature of motor, extends the service life of motor.

Some embodiments according to the present utility model, the motor is positioned at the upstream of the multistage impeller assembly, so that aobvious Writing reduces the operating temperature of motor, improves the reliability of motor.

Some embodiments according to the present utility model, guiding is equipped between impeller assembly described in the return channel and next stage Part, the guide member are suitable for the air-flow for flowing through the return channel being oriented to impeller assembly described in next stage.

Some embodiments according to the present utility model, the guide member include the first guide member, the second guide member and the 3rd Guide member, first guide member are connected with the shell, and second guide member and the 3rd guide member are connected to The both ends of first guide member, wherein the return channel is located on second guide member, impeller assembly described in next stage The diffuser has further facilitated the assembling of electric fan between the 3rd guide member and the shell.

Some embodiments according to the present utility model, formed with outlet on the shell, the outlet is along the shell Axially or radially set.

It is real according to the dust catcher of the utility model second aspect embodiment, including according to the above-mentioned first aspect of the utility model Apply the electric fan of example.

According to the dust catcher of the utility model embodiment, by using above-mentioned electric fan, it is efficient, low to realize dust catcher Make an uproar operation, so as to improve the experience effect of user.

The additional aspect and advantage of the utility model will be set forth in part in the description, partly by from following description In become obvious, or recognized by the practice of the utility model.

Brief description of the drawings

The above-mentioned and/or additional aspect and advantage of the utility model will in the description from combination accompanying drawings below to embodiment Become obvious and be readily appreciated that, wherein：

Fig. 1 is the sectional view according to the electric fan of the utility model embodiment.

Reference numeral：

Electric fan 100, locking nut gasket group 100a,

Shell 1, outlet 10a, import 10b, motor 11, rotor 111, stator 112, motor shaft 11a,

One stage impeller component 2, one stage impeller 21, level-one diffuser 22, level-one diffusion blade 221,

Sencond stage impeller component 3, sencond stage impeller 31, two level diffuser 32,

Return channel 4, reflux blade 41,

Bend part 5, bend face 51, bend 50a,

Guide member 6, the first guide member 61, the second guide member 62, the 3rd guide member 63.

Embodiment

The embodiment of the utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning Same or similar element is represented to same or similar label eventually or there is same or like element.Below by ginseng The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and it is not intended that to the utility model Limitation.

In the description of the utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " thickness The orientation or position relationship of the instruction such as degree ", " on ", " under ", "front", "rear", " interior ", " outer ", " axial direction ", " radial direction ", " circumferential direction " Based on orientation shown in the drawings or position relationship, to be for only for ease of description the utility model and simplifying description, without referring to Show or imply that the device of meaning or element there must be specific orientation, with specific azimuth configuration and operation, therefore cannot manage Solve as the limitation to the utility model.In addition, define " first ", the feature of " second " can express or implicitly include one A or more this feature.In the description of the utility model, unless otherwise indicated, " multiple " are meant that two or two More than.

, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in the description of the utility model Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly Connection；Can mechanically connect or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition Concrete meaning of the language in the utility model.

Electric fan 100 below with reference to Fig. 1 descriptions according to the utility model first aspect embodiment.

As shown in Figure 1, according to the electric fan 100 of the utility model first aspect embodiment, including shell 1, multi-stage impeller Component and at least one return channel 4.

Multi-stage impeller component is each provided in shell 1, and every grade of impeller assembly includes impeller and the diffuser for being located at impeller downstream, Return channel 4 is located between adjacent both stage impellers component.

For example, as shown in Figure 1, both stage impellers component, flowing side of the both stage impellers component along air-flow can be equipped with shell 1 To being arranged at intervals successively, both stage impellers component is respectively one stage impeller component 2 and sencond stage impeller component 3, one stage impeller component 2 In the upstream of sencond stage impeller component 3；One stage impeller component 2 includes one stage impeller 21 and the level-one positioned at 21 downstream of one stage impeller expands Depressor 22, sencond stage impeller component 3 include sencond stage impeller 31 and the two level diffuser 32 positioned at 31 downstream of sencond stage impeller.Return channel 4 For one and the return channel 4 can be located between level-one diffuser 22 and sencond stage impeller 31.Here, it is necessary to illustrate, " on Trip ", " downstream " refer respectively to the upstream of air current flow direction, downstream.

Specifically, electric fan 100 run when, one stage impeller 21 and 31 equal high-speed rotation of sencond stage impeller to produce negative pressure, Air is flowed into from the air inlet of one stage impeller 21, and air is accelerated and lifts the static pressure of air by one stage impeller 21 so that empty Gas is flowed into level-one diffuser 22 with higher flow velocity, flow velocity of the air in level-one diffuser 22 gradually reduces, its static pressure into One step raises；Then, air is flowed out from level-one diffuser 22 and flowed into return channel 4, and return channel 4 can control prewhirling for air Turn to spend and guide air flow so that air flows into sencond stage impeller 31 according to required direction so as to both stage impellers component it Between air carry out racemization, rectification, to realize the continuous boosting of air；Sencond stage impeller 31 is further speeded up air, simultaneously Further lift the static pressure of air so that air is flowed into two level diffuser 32 with higher flow velocity, to realize the deceleration of air Supercharging, final air are flowed out by the outlet 10a of electric fan 100.

Certainly, the impeller assembly being also provided with shell 1 more than three-level or three-level, impeller sets more than three-level or three-level Part is arranged at intervals successively along the flow direction of air-flow, and return channel 4 can be equipped between every adjacent both stage impellers component.

Thus, by including leaf in the interior setting multi-stage impeller component of shell 1 of electric fan 100 and every grade of impeller assembly Wheel and diffuser so that under the same terms (identical impeller diameter and motor outside diameter etc.), the output work of electric fan 100 compared with Greatly, so that when needing to realize identical vacuum, the working speed of impeller assembly can significantly reduce, that is to say, that electric wind Machine 100 can realize required vacuum with relatively low working speed, and then the vibration of electric fan 100 is smaller, caloric value is less, The abrasion of carbon brush is alleviated to extend the service life of carbon brush, while improves the aerodynamic noise of electric fan 100 and vibration is made an uproar Sound, has been obviously improved the reliability of electric fan 100；, can be by sky by setting return channel 4 between adjacent both stage impellers component Gas is preferably guided to next stage impeller assembly from upper level impeller assembly, so as to the air between adjacent both stage impellers component Racemization, rectification are carried out, to realize the continuous boosting of air.

According to the electric fan 100 of the utility model embodiment, by setting multi-stage impeller component and every grade in shell 1 Impeller assembly includes impeller and diffuser, and electric fan 100 can realize required vacuum with relatively low working speed, so that The abrasion condition of the carbon brush of the vibration of electric fan 100, heat condition and electric fan 100 is significantly improved, while improves electricity The aerodynamic noise and vibrating noise of wind turbine 100, have been obviously improved the reliability of electric fan 100, realize electric fan 100 efficiently, Low noise is run, and improves the experience effect of user.

In the further embodiment of the utility model, diffuser includes circumferentially spaced multiple diffusions along impeller Blade, multiple diffusion blades are located at the radial outside of impeller, diffuser passage are limited between two neighboring diffusion blade；Reflux Device 4 includes circumferentially spaced multiple reflux blades 41 along impeller, and reflux is limited between two neighboring reflux blade 41 Device passage.Bend part 5 is equipped between diffuser and return channel 4, the side surface towards shell 1 of bend part 5 has bend face 51, between the outer end of multiple diffusion blades and the outer end of multiple reflux blades 41, bend face 51 is formed as light in bend face 51 Sliding curved surface.

For example, as shown in Figure 1, bend part 5 is located in shell 1, bend face 51 is located at the outside of bend part 5 and bend face 51 The 50a that goes off the curve is limited between shell 1, there is bend 50a bend entrance and bend to export, and bend entrance is adjacent to multiple diffusion leaves Piece is set, the neighbouring multiple reflux blades 41 in bend outlet are set.There is diffuser passage diffuser passage entrance and diffuser to lead to Road exports, and return channel passage has return channel feeder connection and a return channel channel outlet, and wherein diffuser passage entrance is towards phase The air outlet of impeller is answered to set, diffuser passage outlet is exported with the neighbouring setting of bend entrance, return channel feeder connection with bend Neighbouring setting, the air inlet of return channel channel outlet towards next stage impeller are set.

Specifically, when air flows between adjacent both stage impellers component, air inlet stream of the air from upper level impeller Enter and flowed out under the driving of the impeller with higher flow velocity from the air outlet of impeller, then air is from diffuser passage entrance stream Enter in diffuser passage so that air realizes deceleration supercharging in diffuser passage；Then, air goes out bore from diffuser passage To flowing outwardly and being flowed into by bend entrance in bend, since bend face 51 is formed as smooth curved surface, so that air is in bend More uniformly radially-inwardly flowed out from bend outlet under the guiding function of 50a and return channel is flowed into by return channel feeder connection and led to In road, so avoid air between diffuser and return channel 4 flipper turn and cause air at return channel feeder connection 41 root of reflux blade produce larger recirculating zone, cause the larger incidence loss in 41 inlet of reflux blade, so as to be lifted The efficiency of electric fan 100；Then, air is flowed out from return channel channel outlet and flowed into by the air inlet of next stage impeller with reality Now continuous boosting, since the air-flow at return channel feeder connection is more uniform so that the air inlet of above-mentioned next stage impeller Air-flow also more uniformly, so as to improve the efficiency of this grade of impeller, further improves the efficiency of electric fan 100.

Here, it is necessary to which explanation, direction " outer " refer to the direction away from 100 central axis of electric fan, its opposite direction It is defined as " interior ".

In the alternative embodiment of the utility model, as shown in Figure 1, bend face 51 is formed towards the arc of the protrusion of shell 1 Face such as arc surface, elliptical arc surface, on the longitudinal cross-section of electric fan 100, the projection in bend face 51 can be formed as arcuation Structure, the arc structure are outwardly so that the flow direction of the cross-sectional area of bend 50a along air first reduces to increase afterwards, empty Gas is held essentially constant in the flow velocity of bend inlet, static pressure and flow velocity, static pressure in bend exit, reduces the stream of air Dynamic loss.Thus, ensure return channel passage interior air-flow it is uniform under the premise of, simplify the shape in bend face 51, facilitate it is curved The shaping in road face 51.Certainly, bend face 51 may be formed as spline surface, and not limited to this.

In the further embodiment of the utility model, on the longitudinal cross-section of electric fan 100, outside the direction of bend part 5 Minimum range between one side surface of shell 1 and the internal face of shell 1 is L, a diameter of d in bend face 51, and L, d meet：2×L/ 3≤d≤2×L.For example, in the example of fig. 1, bend face 51 can be formed as arc surface, a diameter of d of the arc surface and should Arc surface is protruded towards shell 1, and the minimum range between the internal face of the arc surface and shell 1 is L, by setting L, d to meet 2 × L/3≤d≤2 × L, further improve the uniformity of return channel passage interior air-flow, while avoid 51 diameter mistake of bend face Increase the axial length of electric fan 100 greatly, cause the occupied space of electric fan 100 larger, avoid 51 diameter mistake of bend face It is small and cause 5 processing difficulties of bend part.

Alternatively, at least one in diffuser and return channel 4 is connected on bend part 5, so as to facilitate electric fan 100 Assembling.For example, in the example of fig. 1, diffuser is located on bend part 5, specifically, multiple diffusion blades are located at bend part On 5 and multiple diffusion blades can be located at the front side of bend part 5, so that diffuser and bend part 5 can pass through fixed knot together Structure is fixed on such as screw on shell 1, facilitates the assembling of electric fan 100, improves the packaging efficiency of electric fan 100.

It is understood that return channel 4 can also be located on bend part 5, specifically, multiple reflux blades 41 are located at curved On road part 5 and multiple reflux blades 41 can be located at the rear side of bend part 5, equally facilitate the assembling of electric fan 100.

It is equipped with motor 11 in specific embodiment of the utility model, in shell 1, at least level-one in multi-stage impeller component Positioned at the downstream of motor 11.That is, motor 11 can be located at the upstream of multi-stage impeller component, or motor 11 can be with position In multi-stage impeller component between arbitrary neighborhood both stage impellers component, so that cold air is merely through the part in multi-stage impeller component Flow direction motor 11 or cold air flow directly into motor 11 without the compression of impeller assembly after the compression of impeller assembly, make It must flow through that the temperature of the air of motor 11 is relatively low, the winding of motor 11 can be lost magnetic field in caloric value and motor 11 and drawn by air The core loss caloric value risen is taken away effectively to be radiated to motor 11, reduces the operating temperature of motor 11, extends motor 11 Service life, cost is low.Here, it is necessary to which explanation, " cold air " is relative concept, refers to the relatively low air of temperature.

It is understood that motor 11 is preposition relatively low to flow through the temperature of the air of motor 11, it can be also used for electricity In the low-cost design of of machine 11 itself.

Specifically, motor 11 is located at the upstream of multi-stage impeller component.For example, in the example of fig. 1, it can be set in shell 1 There is both stage impellers component, and both stage impellers component is respectively positioned on the downstream of motor 11, that is to say, that when electric fan 100 is run, cold sky Gas flows into from the import 10b of electric fan 100 and first flows through motor 11 to carry out heat convection with motor 11, so that by motor 11 Winding loss caloric value and motor 11 in core loss caloric value caused by magnetic field take away effectively to be radiated to motor 11, The operating temperature of motor 11 is significantly reduced, and then improves the reliability of motor 11, extends the service life of motor 11.

Certainly, when in shell 1 equipped with impeller assembly more than three-level or three-level, all impeller assemblies can be respectively positioned on electricity The downstream of machine 11.

Further, as shown in Figure 1, being equipped with guide member 6 between return channel 4 and next stage impeller assembly, guide member 6 is suitable for The air-flow for flowing through return channel 4 is oriented to next stage impeller assembly so that air-flow flowing is more uniform.

Specifically, as shown in Figure 1, guide member 6 includes the first guide member 61, the second guide member 62 and the 3rd guide member 63, First guide member 61 is connected with shell 1, and the second guide member 62 and the 3rd guide member 63 are connected to the two of the first guide member 61 End, wherein return channel 4 is located on the second guide member 62, and the diffuser of next stage impeller assembly is located at the 3rd guide member 63 and shell Between 1.First guide member 61 can be generally formed into cylindrical structure, before the second guide member 62 can be located at the first guide member 61 End, the 3rd guide member 63 can be located at the rear end of the first guide member 61, and return channel 4 can be located at the front side of the second guide member 62, The corresponding diffuser of next stage impeller assembly can be located at the rear side of the 3rd guide member 63, and the first guide member 61 can be with shell 1 Coordinate and be connected, so as to facilitate the assembling of guide member 6 and return channel 4, further facilitated the assembling of electric fan 100.

In some embodiments of the utility model, formed with outlet 10a, axial directions of the outlet 10a along shell 1 on shell 1 Or radially set, so as to set the direction of outlet 10a according to the actual requirements, preferably to meet practical application.For example, such as Shown in Fig. 1, outlet 10a is set along the radial direction of shell 1, and outlet 10a can be formed on the periphery wall of shell 1 so that from electric wind The air of outflow is by exporting 10a radially flowing out along shell 1 in machine 100.Certainly, outlet 10a can also be set along the axial direction of shell 1 Put, exporting 10a at this time can be formed on the end face of shell 1 so that the air of outflow is by exporting 10a edges in from electric fan 100 The axial outflow of shell 1.

It is real according to the dust catcher of the utility model second aspect embodiment, including according to the above-mentioned first aspect of the utility model Apply the electric fan 100 of example.

According to the dust catcher of the utility model embodiment, by using above-mentioned electric fan 100, dust catcher height is realized Effect, low noise operation, so as to improve the experience effect of user, while ensure that the reliability and service life of dust catcher.

According to other compositions of the dust catcher of the utility model embodiment and operate for those of ordinary skill in the art For be all known, be not detailed herein.

Electric fan 100 below with reference to Fig. 1 with a specific embodiment detailed description according to utility model embodiment.Value It must understand, it is described below to be merely illustrative, rather than the concrete restriction to utility model.

As shown in Figure 1, electric fan 100 includes shell 1, both stage impellers component and a return channel 4.Wherein, shell 1 includes The cover body and end cap being connected with each other, cover body are located at the front side of end cap, and cover body and end cap limit installation space jointly, shape on cover body Into thering is import 10b, import 10b to be formed on the front end face of cover body and import 10b is set along the axial direction of electric fan 100, on end cap Formed with outlet 10a, outlet 10a is formed on the periphery wall of end cap and outlet 10a is set along the radial direction of electric fan 100 so that The axial radial flow that flows into electric fan 100 in and from outlet 10a along electric fan 100 of the air from import 10b along electric fan 100 Go out；Bearing block and motor 11 are equipped with cover body, bearing block is fixedly linked with cover body and bearing seat is in the upstream of motor 11, motor 11 are located at the upstream of both stage impellers component, and motor 11 has motor shaft 11a and motor 11 includes stator 112 and rotor 111, motor Axis 11a is threaded through in bearing block and bearing is equipped between motor shaft 11a and bearing block, and stator 112 includes stator core and stator Winding, rotor 111 are set on motor shaft 11a to drive motor shaft 11a to rotate synchronously；Both stage impellers component and return channel 4 are equal In above-mentioned installation space, both stage impellers component is respectively one stage impeller component 2 and sencond stage impeller component 3, and one stage impeller Component 2 and sencond stage impeller component 3 are arranged at intervals successively along the flow direction of air-flow, and one stage impeller component 2 is located at sencond stage impeller group The upstream of part 3, one stage impeller component 2 include one stage impeller 21 and the level-one diffuser 22 positioned at 21 downstream of one stage impeller, two level Impeller assembly 3 includes sencond stage impeller 31 and the two level diffuser 32 positioned at 31 downstream of sencond stage impeller, and wherein return channel 4 is located at level-one Between diffuser 22 and sencond stage impeller 31, one stage impeller 21 and sencond stage impeller 31 are fixed by locking nut gasket group 100a and pacified On motor shaft 11a, so that motor shaft 11a can drive one stage impeller 21 and sencond stage impeller 31 to rotate with import 10b Produce negative pressure.

Specifically, level-one diffuser 22 includes circumferentially spaced multiple level-one diffusion blades along one stage impeller 21 221, multiple level-one diffusion blades 221 are located at the radial outside of one stage impeller 21, are limited between two neighboring level-one diffusion blade 221 Make level-one diffuser passage；Return channel 4 includes circumferentially spaced multiple reflux blades 41 along one stage impeller 21, phase Return channel passage is limited between adjacent two reflux blades 41.Bend part 5 is equipped between level-one diffuser 22 and return channel 4, it is more A level-one diffusion blade 221 is located on bend part 5 and multiple level-one diffusion blades 221 are located at the front side of bend part 5, return channel 4 Guide member 6 is equipped between sencond stage impeller component 3, guide member 6 includes the first guide member 61, the second guide member 62 and the 3rd guiding Part 63, the first guide member 61 coordinate with shell 1 and are connected, and the second guide member 62 and the 3rd guide member 63 are connected to the first guiding The front-end and back-end of part 61, extend, multiple return channels wherein the second guide member 62 slopes inwardly from the front end of the first guide member 61 Blade 41 is located on the second guide member 62 and multiple return channel blades 41 are located at the rear side of bend part 5, and the 3rd guide member 63 is from The rear end of one guide member 61, which slopes inwardly, to be extended, and two level diffuser 32 is between the 3rd guide member 63 and shell 1 and two level expands Two level diffuser passage is limited in depressor 32.

As shown in Figure 1, the side surface towards shell 1 of bend part 5 has bend face 51, bend face 51 is located at multiple one Limit and go off the curve between the outer end of level diffusion blade 221 and the outer end of multiple reflux blades 41, between bend face 51 and shell 1 50a, bend face 51 be formed towards shell 1 protrusion arc surface, while on the longitudinal cross-section of electric fan 100, arc surface with Minimum range between the internal face of shell 1 is L, a diameter of d of arc surface, and L, d meet 2 × L/3≤d≤2 × L.

Bend part 5 such as can be generally formed at the wall thickness component, and bearing is equipped between the inner side of bend part 5 and motor shaft 11a, Bend part 5 extends radially to the outer end of multiple reflux blades 41 from above-mentioned bearing from inside to outside, and then bend part 5 is along circular arc line The outer end of multiple level-one diffusion blades 221 is extended forwardly into, subsequent 5 ecto-entad of bend part radially extends so that 5 knot of bend part Structure is simple, is easily installed.

There is 22 passage of level-one diffuser level-one diffuser passage entrance and level-one diffuser passage to export, two level diffuser There is passage two level diffuser passage entrance and two level diffuser passage to export, return channel passage have return channel feeder connection and There is bend entrance and bend to export by return channel channel outlet, bend 50a, and wherein level-one diffuser passage entrance is towards level-one leaf The air outlet of wheel 21 is set, level-one diffuser passage is exported with bend entrance adjacent to setting, and return channel feeder connection goes out with bend The neighbouring setting of mouth, the air inlet of return channel channel outlet towards sencond stage impeller 31 are set, two level diffuser passage entrance direction two The air outlet of level impeller 31 is set, the outlet of two level diffuser passage is set towards outlet 10a.

When electric fan 100 is run, motor shaft 11a high-speed rotations, one stage impeller 21 and 31 equal high-speed rotation of sencond stage impeller with Negative pressure is produced, axial direction of the cold air from import 10b along electric fan 100 flows into and carry out heat convection, heat exchange with motor 11 first Air afterwards is flowed into from the air inlet of one stage impeller 21, and air is accelerated and lift the static pressure of air, made by one stage impeller 21 Air with radially outward outflow of the higher flow velocity from the air outlet of one stage impeller 21 along electric fan 100, then air is from one Level diffuser passage entrance is flowed into level-one diffuser 22, and flow velocity of the air in level-one diffuser 22 gradually reduces, its static pressure Further rise；Then, air exports radially outward outflow from level-one diffuser passage and flows into bend 50a by bend entrance It is interior, since bend face 51 is arc surface, so that air more uniformly goes out bore under the guiding function of bend 50a from bend Flowed into return channel 4 in inside outflow and by return channel feeder connection, air leads under the guiding function of return channel 4 from return channel Say the axial outflow of opening's edge electric fan 100 and flowed into by the air inlet of sencond stage impeller 31 in sencond stage impeller component 3, sencond stage impeller Air is further speeded up and further lifts the static pressure of air by 31 so that air is with higher flow velocity from sencond stage impeller 31 air outlet is along the radially outward inflow two level diffuser 32 of electric fan 100, to realize that air further slows down supercharging, Final air is by exporting radially outward outflows of the 10a along electric fan 100.

It is clean after dirt bag or cyclone separator in dust catcher when electric fan 100 is applied to dust catcher Cold air is flowed into electric fan 100 by import 10b along the axial of electric fan 100, and is flowed down in the driving effect of electric fan 100 Go out, effective heat dissipation of motor 11 is realized, simultaneously because electric fan 100 is flowed through after air purification, so as to avoid in air The abrasion of particles such as dust electric fan 100, so as to further extend the service life of electric fan 100.

According to the electric fan 100 of the utility model embodiment, in the same terms (identical impeller diameter and motor outside diameter Deng) under, electric fan 100 can realize required vacuum with relatively low working speed, high-power with 30,000 turns traditional of routine Electric fan is compared, and when reaching identical vacuum and air quantity, the rotating speed of traditional electric fan is 30,000 turns, the utility model embodiment The rotating speed of electric fan 100 can drop to 2.1 ten thousand turns so that significantly improve the vibration of electric fan 100, heat condition and The abrasion condition of the carbon brush of electric fan 100, while the aerodynamic noise and vibrating noise of electric fan 100 are improved, it is obviously improved The reliability of electric fan 100；Since motor 11 is located at the upstream of both stage impellers component so that cold air first flow through motor 11 with Effectively radiated to motor 11, reduce the operating temperature of motor 11, the operating temperature of motor 11 is less than 20 DEG C so that motor 11 reliable operations, service life length, so as to improve the percent of pass of 500 hour life tests of electric fan 100, meet dust suction The international standard of device；By setting bend part 5 between level-one diffuser 22 and return channel 4, bend part 5 towards shell 1 One side surface has bend face 51, and bend face 51 is formed as arc surface so that air is more equal under the guiding function of bend part 5 Radially-inwardly flow out from bend outlet and flowed into by return channel feeder connection in return channel passage evenly, and then avoid air and exist Flipper turn between level-one diffuser 22 and return channel 4 and cause reflux blade 41 root of the air at return channel feeder connection Produce larger recirculating zone, cause the larger incidence loss in 41 inlet of reflux blade, while reduce 4 interior air-flow of return channel Separation loss, improve the efficiency of sencond stage impeller 31, so as to improve the efficiency of electric fan 100.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ", The description of " example ", " specific example " or " some examples " etc. means to combine specific features, the knot that the embodiment or example describe Structure, material or feature are contained at least one embodiment or example of the utility model.In the present specification, to above-mentioned art The schematic representation of language may not refer to the same embodiment or example.Moreover, description specific features, structure, material or Person's feature can combine in an appropriate manner in any one or more embodiments or example.

While there has been shown and described that the embodiment of the utility model, it will be understood by those skilled in the art that： These embodiments can be carried out with a variety of changes, modification in the case where not departing from the principle and objective of the utility model, replaced And modification, the scope of the utility model are limited by claim and its equivalent.

Claims

A kind of 1. electric fan, it is characterised in that including：

Shell；

Multi-stage impeller component, the multistage impeller assembly are each provided in the shell, every grade of impeller assembly include impeller and It is located at the diffuser in the impeller downstream；

At least one return channel, the return channel are located between impeller assembly described in adjacent two-stage.
2. electric fan according to claim 1, it is characterised in that the diffuser is included along the circumferentially-spaced of the impeller The multiple diffusion blades set, multiple diffusion blades are located at the radial outside of the impeller,

The return channel includes circumferentially spaced multiple reflux blades along the impeller,

Bend part, the side surface tool of the direction shell of the bend part are equipped between the diffuser and the return channel There is bend face, the bend face is between the outer end of multiple diffusion blades and the outer end of multiple reflux blades, institute State the curved surface that bend face is formed as smooth.
3. electric fan according to claim 2, it is characterised in that the bend face is formed towards the shell protrusion Cambered surface.
4. electric fan according to claim 3, it is characterised in that on the longitudinal cross-section of the electric fan,

Minimum range between a side surface of the direction shell for the bend part and the internal face of the shell is L, institute A diameter of d in bend face is stated, described L, d meet：2×L/3≤d≤2×L.
5. electric fan according to claim 2, it is characterised in that at least one in the diffuser and the return channel It is connected on the bend part.
6. according to the electric fan any one of claim 1-5, it is characterised in that motor is equipped with the shell, it is multistage At least level-one in the impeller assembly is located at the downstream of the motor.
7. electric fan according to claim 6, it is characterised in that the motor is upper positioned at the multistage impeller assembly Trip.
8. electric fan according to claim 1, it is characterised in that between impeller assembly described in the return channel and next stage Equipped with guide member, the guide member is suitable for the air-flow for flowing through the return channel being oriented to impeller assembly described in next stage.
9. electric fan according to claim 8, it is characterised in that the guide member includes the first guide member, the second guiding Part and the 3rd guide member, first guide member are connected with the shell, second guide member and the 3rd guide member point The both ends of first guide member are not connected to, wherein the return channel is located on second guide member, leaf described in next stage The diffuser of wheel assembly is between the 3rd guide member and the shell.
10. electric fan according to claim 1, it is characterised in that described to export along institute formed with outlet on the shell State the axially or radially setting of shell.
11. a kind of dust catcher, it is characterised in that including the electric fan according to any one of claim 1-10.