CN212376941U - Fan assembly - Google Patents

Abstract

The utility model relates to a fan assembly, which comprises a shell, a synchronous motor, a first through-flow impeller, a second through-flow impeller, a first driving motor and a second driving motor, and is characterized in that the shell comprises a top shell, a bottom shell, a first middle shell and a second middle shell and defines a through hole; the first middle housing and the second middle housing are both located between the top housing and the bottom housing; the first middle shell is provided with a first air inlet and a first air outlet and is fixed with a first volute and a first volute tongue; the second middle shell is provided with a second air inlet and a second air outlet and is fixed with a second volute and a second volute tongue; the fan assembly further includes a fixing member; wherein, first middle part shell and second middle part shell can both be rotated for the top shell under synchronous motor's drive. The utility model discloses a fan assembly has simple structure, the required drive power of swing and the required space of swing all characteristics such as less and easily installation.

Description

Fan assembly

Technical Field

The utility model relates to a fan assembly. In particular, but not exclusively, the invention relates to domestic fans for creating air circulation and airflow in a room, office or other domestic environment.

Background

Chinese patent application No. CN109707651A, patent publication No. 5/3/2019 (application No. 201910118682.9), discloses a fan comprising a base and a fan head, the fan head comprising: the fan comprises a shell, a first air flow channel, a second air flow channel, a plurality of first air inlets, a plurality of second air inlets, a plurality of first air outlets, a plurality of second air outlets, a first impeller, a second impeller, a first motor and a second motor, wherein the shell limits a through hole, at least part of the first air outlets or the second air outlets are adjacent to the through hole, the first impeller and the second impeller are arranged in parallel at a certain distance and have opposite rotating directions, and air from the outside of the fan can be sucked through the through hole by the air flow emitted from the first air outlets and the second air outlets. The base of the fan is fixed, and the whole fan head can swing around the base so as to change the air outlet direction of the fan. Since the fan head of the fan needs to swing, only one end of the base can be used for fixing or mounting, so that the fan is difficult to mount on a wall or a ceiling, and the use of the fan is limited; in addition, the switch button of the fan is usually arranged on the higher fan head, and the swinging of the fan head also brings difficulty to the manual operation of the switch button; because the width of the fan in the left-right direction is generally larger than the depth of the fan in the front-back direction, the space required by the fan swing is larger; in particular, the whole fan head is heavy, the driving force required for swinging is large, and shaking is easy to occur.

Disclosure of Invention

An object of the utility model is to overcome not enough among the prior art, provide one kind have simple structure, the required drive power of swing and the required space of swing all less and easily lay or the fan assembly of installation.

In order to realize the purpose, the technical scheme of the utility model is that: a fan assembly comprises a shell, and a synchronous motor, a first cross-flow impeller, a second cross-flow impeller, a first driving motor and a second driving motor which are positioned in the shell, wherein the first driving motor and the second driving motor respectively drive the first cross-flow impeller and the second cross-flow impeller to rotate and work; the first middle housing and the second middle housing are both located between and spaced apart from the top housing and the bottom housing; the first middle shell is provided with a plurality of first air inlets and a plurality of first air outlets and is fixed with a first volute and a first volute tongue; the second middle shell is provided with a plurality of second air inlets and a plurality of second air outlets and is fixed with a second volute and a second volute tongue; the first cross flow impeller is positioned in the first middle shell, and the second cross flow impeller is positioned in the second middle shell; the fan assembly further comprises a fixing member for fixedly connecting the top casing and the bottom casing together; the first middle shell and the second middle shell can rotate relative to the top shell under the drive of the synchronous motor; air from outside the fan assembly can be drawn through the through-holes by the airflows output from the first and second air outlets.

The first driving motor and the second driving motor can be selectively fixed with the bottom shell; optionally, may be secured to the top housing. Preferably, the first drive motor and the second drive motor are both fixed to the bottom housing.

Preferably, the first drive motor does not follow the rotation of the first mid housing relative to the top housing, nor does the second drive motor follow the rotation of the second mid housing relative to the top housing.

Preferably, the first cross flow impeller does not follow the first intermediate casing for rotation relative to the top casing, nor does the second cross flow impeller follow the second intermediate casing for rotation relative to the top casing.

In the fan assembly, the swing for changing the air outlet direction is realized by the rotation of the first middle shell and the second middle shell relative to the top shell, and the rotation or swing for changing the air outlet direction occupies relatively small space; because the structure formed by the top shell, the bottom shell and the fixed component bears the weight of the synchronous motor, the first through-flow impeller, the second through-flow impeller, the first driving motor, the second driving motor and the like, the total weight of the first middle shell, the second middle shell, the first volute tongue, the second volute and the second volute tongue which can rotate relative to the top shell is relatively light, and therefore the driving force of the synchronous motor can be reduced; because the top shell and the bottom shell are always kept still in the swinging process, the top shell and the bottom shell can be used as fixing parts to be fixed or installed with objects such as walls or ceilings and the like, the convenience for installing or fixing the fan assembly is improved, and meanwhile, the safety is also improved; because the top shell and the bottom shell are always kept still in the swinging process, the switch button usually arranged on the top shell is easy to be manually operated; in addition, the fan assembly is simple in structure, and is beneficial to improving the reliability and reducing the production cost.

When the fan assembly swings for working, the first air inlet, the first air outlet, the first volute and the first volute tongue rotate relatively along with the first middle shell relative to the top shell, and the second air inlet, the second air outlet, the second volute and the second volute tongue also rotate relatively along with the second middle shell, so that the air outlet efficiency of the fan assembly is basically kept unchanged in the whole swinging process.

In a preferred embodiment, the synchronous motor comprises a first synchronous motor that can simultaneously provide a driving force for relative rotation of the first and second middle housings through a gear set.

Preferably, the synchronous motors include a first synchronous motor and a second synchronous motor; the first middle shell can rotate relative to the top shell under the drive of the first synchronous motor so as to change the direction of the airflow emitted from the first air outlet; the second middle housing can be driven by a second synchronous motor to rotate relative to the top housing to change the direction of the airflow emitted from the second air outlet.

In a preferred embodiment, the synchronous motor comprises a first synchronous motor and a second synchronous motor, the rotating shaft of the first synchronous motor is parallel to the rotating shaft of the second synchronous motor, and the first middle housing rotates relative to the top housing in the same direction as the second middle housing rotates relative to the top housing under the driving of the first synchronous motor and the second synchronous motor. Thus, when the fan component swings, the airflow emitted from the first air outlet and the airflow emitted from the second air outlet can change in the same direction.

In another preferred embodiment, the synchronous motors include a first synchronous motor and a second synchronous motor, the rotating shaft of the first synchronous motor is parallel to the rotating shaft of the second synchronous motor, and the first middle housing rotates relative to the top housing in the opposite direction to the second middle housing under the driving of the first synchronous motor and the second synchronous motor. Thus, when the fan component swings to work, the airflow output from the first air outlet and the airflow output from the second air outlet can be changed in opposite directions at the same time.

In yet another preferred embodiment, the synchronous motors include a first synchronous motor and a second synchronous motor, a rotating shaft of the first synchronous motor is parallel to a rotating shaft of the second synchronous motor; in the first synchronous driving operation mode, the direction of rotation of the first middle housing relative to the top housing is the same as the direction of rotation of the second middle housing relative to the top housing; in the second synchronous drive mode of operation, the first mid-section housing rotates in a direction opposite to the direction in which the second mid-section housing rotates relative to the top housing. In this embodiment, the user can select different synchronous driving working modes to change the air outlet direction of the fan assembly, which is beneficial to meeting different requirements of different people.

Preferably, the first and second intermediate casings each comprise a cylindrical casing, more preferably both comprise cylindrical casings.

Typically, the securing member is located within the housing so that the overall fan assembly is more aesthetically pleasing. The securing member may also be located outside the housing, so that the structure inside the housing is simpler.

Preferably, the fixing member includes a first fixing member and a second fixing member.

In a preferred embodiment, the securing member comprises a first securing member and a second securing member, wherein the first securing member is located within the first mid-section housing and the second securing member is located within the second mid-section housing.

In another preferred embodiment, the fixation member comprises a first fixation member and a second fixation member, wherein both the first fixation member and the second fixation member are located outside the housing.

The fixing member may be of various structures, may be a fixing rod, or may be in other forms.

Preferably, the fan assembly further comprises a first upper turntable having a shaft hole and a second upper turntable having a shaft hole, wherein the first upper turntable is fixed to the upper end of the first middle housing, and the second upper turntable is fixed to the upper end of the second middle housing. Set up carousel on first last carousel and the second, easily first middle part shell or second middle part shell carry out relative rotation for the top shell to realize fan assembly's swing.

In a preferred embodiment, the fan assembly includes a first upper rotary plate fixed to an upper end portion of the first middle housing and a second upper rotary plate fixed to an upper end portion of the second middle housing, wherein the first upper rotary plate has a shaft hole and a passage through which the first fixing member passes, and the second upper rotary plate also has a shaft hole and a passage through which the second fixing member passes.

The channel for the first fixing component to pass through is a through hole which is arranged on the first upper rotating disc and can enable the first fixing component to pass through all the time when the fan assembly swings; the channel for the second fixing member to pass through is a through hole which is formed in the second upper rotating disc and can enable the second fixing member to pass through all the time when the fan assembly swings.

In a preferred embodiment, the fan assembly further comprises a first upper turntable, a first lower turntable, a second upper turntable, and a second lower turntable having shaft holes, wherein the first upper turntable and the first lower turntable are fixed to the upper and lower ends of the first middle housing, respectively, and the second upper turntable and the second lower turntable are fixed to the upper and lower ends of the second middle housing, respectively.

In a preferred embodiment, one of the first middle housing and the first fixing member is fixed with a first synchronous rotating shaft, the other of the first middle housing and the first fixing member is fixed with a first shaft sleeve, the first synchronous rotating shaft is positioned in the first shaft sleeve, and the first synchronous rotating shaft and the rotating shaft of the first through-flow impeller are positioned on the same straight line; and a second synchronous rotating shaft is fixed on one of the second middle shell and the second fixing component, a second shaft sleeve is fixed on the other one of the second middle shell and the second fixing component, and the second synchronous rotating shaft is positioned in the second shaft sleeve, wherein the second synchronous rotating shaft and the rotating shaft of the second cross-flow impeller are positioned on the same straight line.

Preferably, the first cross-flow impeller rotates in a direction opposite to that of the second cross-flow impeller, and air from outside the fan can be drawn through the through-holes by the air flows emitted from the first and second air outlets.

Preferably, the rotational speed of the first through-flow impeller is not equal to the rotational speed of the second impeller. This is advantageous in preventing resonance of the fan assembly.

Preferably, the first cross flow impeller and the second cross flow impeller are arranged in parallel at a distance. The rotational speed of the first and second through-flow impellers is typically between 500rpm and 4000rpm, preferably between 1200rpm and 3000 rpm. The first drive motor and the second drive motor may be dc brushless motors or ac motors.

Preferably, the synchronous motor includes a synchronous motor that can rotate in both forward and reverse directions. The synchronous motor can control the rotating direction thereof under the control of the control circuit, and can rotate in the positive direction or the negative direction.

The cross section of the through hole can be rectangular, runway-shaped or other shapes; the rectangle preferably comprises a rounded rectangle.

In order to enable the fan assembly to output a flow of hot air, heating means may be provided within the housing for heating the air flow.

In order to purify the air or to obtain clean air, a filter may also be provided in the housing for removing particles from the air flow.

Drawings

Fig. 1 is a front schematic view of a fan assembly according to the present invention.

Fig. 2 is a rear view of the fan assembly shown in fig. 1.

Fig. 3 is a side view of the fan assembly of fig. 1.

Fig. 4 is a cross-sectional view of the fan assembly taken along line a-a in fig. 1.

Fig. 5 is a sectional view of the fan assembly taken along line B-B in fig. 3.

FIG. 6 is a cross-sectional view of the fan assembly taken along line A-A of FIG. 1 as both the first and second mid-housings of FIG. 1 are rotated in a clockwise direction relative to the top housing to a position.

FIG. 7 is a cross-sectional view of the fan assembly taken along line A-A of FIG. 1 when both the first and second mid-housings of FIG. 1 are rotated in a counter-clockwise direction relative to the top housing to a position.

FIG. 8 is a cross-sectional view of the fan assembly taken along line A-A in FIG. 1 as the first mid-housing of FIG. 1 is rotated in a clockwise direction relative to the top housing to a position and the second mid-housing is rotated in a counterclockwise direction relative to the top housing to a position.

FIG. 9 is a cross-sectional view of the fan assembly taken along line A-A in FIG. 1 as the first mid-housing of FIG. 1 is rotated in a counter-clockwise direction relative to the top housing to a position and the second mid-housing is rotated in a clockwise direction relative to the top housing to a position.

Fig. 10 is a schematic front view of a fan assembly of a second embodiment.

Fig. 11 is a rear view of the fan assembly shown in fig. 10.

Fig. 12 is a side view of the fan assembly shown in fig. 10.

Fig. 13 is a cross-sectional view of the fan assembly taken along line C-C in fig. 10.

Fig. 14 is a cross-sectional view of the fan assembly taken along line D-D in fig. 12.

Detailed Description

Fig. 1 is a schematic view of a fan assembly according to the present invention, as viewed from the front of the fan assembly 100, fig. 2 is a rear view of the fan assembly shown in fig. 1, fig. 3 is a side view of the fan assembly shown in fig. 1, fig. 4 is a sectional view of the fan assembly taken along line a-a in fig. 1, and fig. 5 is a sectional view of the fan assembly taken along line B-B in fig. 3. As can be seen from fig. 1 to 5, the fan assembly 100 includes a housing 80 and a first synchronous motor 13, a second synchronous motor 14, a first crossflow impeller 9, a second crossflow impeller 10, a first drive motor 11 and a second drive motor 12 located within the housing 80.

In the present embodiment, the first drive motor 11 and the second drive motor 12 are both dc brushless motors; the first synchronous motor 13 and the second synchronous motor 14 are low-speed motors whose forward rotation and reverse rotation are controllable.

As best seen in fig. 1 and 2, the housing 80 includes a top housing 3, a bottom housing 4, a first middle housing 1 and a second middle housing 2, the housing 80 defining a through hole 50; the first middle shell 1 is positioned between the top shell 3 and the bottom shell 4, the second middle shell 2 is also positioned between the top shell 3 and the bottom shell 4, and the first middle shell 1 and the second middle shell 2 are separated by a certain distance; a plurality of first air inlets 7 and a plurality of first air outlets 5 are provided on the first mid housing 1, and a plurality of second air inlets 8 and a plurality of second air outlets 6 are provided on the second mid housing 2.

In the present embodiment, the first inlet port 7 and the second inlet port 8 are each in the form of circular holes having a diameter of about 3 mm; the first outlet 5 and the second outlet 6 are in the form of notches, the width of which is approximately 5 mm; the top housing 3, the bottom housing 4, the first middle housing 1 and the second middle housing 2 are all formed of plastic.

As can be seen in fig. 4 and 5, a first volute case 41 and a first volute tongue 43 are fixed on the inner wall of the first middle casing 1, and a second volute case 42 and a second volute tongue 44 are fixed on the inner wall of the second middle casing 2; the first cross flow impeller 9 is located in the first middle housing 1 and the second cross flow impeller 10 is located in the second middle housing 2. The first volute 41, the first volute tongue 43, the second volute 42 and the second volute tongue 44 of the present embodiment are all formed of plastic.

As can also be seen in fig. 4 and 5, a first lower seat 45 and a second lower seat 46 are fixed on the inner wall of the bottom casing 4; a first upper base 35 is arranged in the first middle housing 1, and the first upper base 35 is fixed with the inner wall of the top housing 3 through a first fixing shaft 23; a second upper base 36 is arranged in the second middle housing 2, and the second upper base 36 is fixed with the inner wall of the top housing 3 through a second fixing shaft 24; the first driving motor 11 is disposed in the first sub-mount 45, the flexible member 31 for absorbing vibration is disposed between the first driving motor 11 and the first sub-mount 45, the second driving motor 12 is disposed in the second sub-mount 46, and the flexible member 32 for absorbing vibration is disposed between the second driving motor 12 and the second sub-mount 46, so that both the first driving motor 11 and the second driving motor 12 are fixed to the bottom case 4; the first drive motor 11 is connected to the first crossflow impeller 9 via a drive shaft 25, and the second drive motor 12 is connected to the second crossflow impeller 10 via a drive shaft 26; the upper end of the first crossflow impeller 9 has a first upper rotating shaft 21, the upper end of the second crossflow impeller 10 has a second upper rotating shaft 22, the first upper rotating shaft 21 is supported by a first bearing 19 arranged in a first upper base 35, and the second upper rotating shaft 22 is supported by a second bearing 20 arranged in a second upper base 36.

As can be seen from fig. 4 and 5, a first fixing member 39 is further provided in the first middle housing 1, a second fixing member 40 is further provided in the second middle housing 2, upper ends of the first and second fixing members 39 and 40 are fixed to the top housing 3, and lower ends of the first and second fixing members 39 and 40 are fixed to the bottom housing 4. Thus the top and bottom housings 3, 4 and the first and second fixing members 39, 40 are fixed together, thereby forming a stable structure; as is readily apparent from fig. 5, this robust structure carries the weight of the first drive motor 11, the second drive motor 12, the first through-flow impeller 9 and the second through-flow impeller 10. The first fixing member 39 and the second fixing member 40 of the present embodiment are straight rods, and the first fixing member 39 and the second fixing member 40 may have other shapes and structures according to the requirement, for example, the first fixing member and the second fixing member may be formed by connecting several segments of rods.

As can be seen from fig. 5, a first upper rotating disk 29 is fixed to the upper end portion of the first middle housing 1, the first upper rotating disk 29 having a shaft hole into which the first fixed shaft 23 extends and a passage through which the first fixed member 39 passes, the first upper rotating disk 29 being supported by a third bearing 37; similarly, a second upper rotating disk 30 is fixed to the upper end portion of the second middle housing 2, the second upper rotating disk 30 also has a shaft hole into which the second fixed shaft 24 extends and a passage through which the second fixed member 40 passes, and the second upper rotating disk 30 is supported by a fourth bearing 38; a first synchronous motor 13 is arranged in the top shell 3, and a first driving gear 15 fixed on a rotating shaft of the first synchronous motor 13 is meshed with a rack 17 fixed on the outer wall of the first middle shell 1; a second synchronous motor 14 is further arranged in the top shell 3, and a second driving gear 16 fixed on the rotating shaft of the second synchronous motor 14 is meshed with a rack 18 fixed on the outer wall of the second middle shell 2.

In the present embodiment, a cable through hole (not shown) is provided in the bottom case 4, and the circuit device 60 is provided in the bottom case 4; the circuit device 60 is electrically connected to the first driving motor 11 and the second driving motor 12, respectively, to control the first driving motor 11 and the second driving motor 12 to drive the first cross flow impeller 9 and the second cross flow impeller 10 to rotate, respectively; the circuit device 60 is further electrically connected to the first synchronous motor 13 and the second synchronous motor 14, respectively, so as to control the first synchronous motor 13 and the second synchronous motor 14 to drive the first middle housing 1 and the second middle housing 2 to rotate or swing relative to the top housing 3, respectively, so as to change the air outlet direction of the fan assembly 100; as can be seen from fig. 5, the first drive motor 11 does not follow the rotation or oscillation of the first middle housing 1 relative to the top housing 3, nor does the second drive motor 12 follow the rotation or oscillation of the second middle housing 2 relative to the top housing 3; the first cross flow impeller 9 does not follow the first middle casing 1 to rotate or oscillate relative to the top casing 3, nor does the second cross flow impeller 10 follow the second middle casing 2 to rotate or oscillate relative to the top casing 3.

As can be easily seen in fig. 4 and 5, the direction of rotation ω 1 of the first cross flow impeller 9 is opposite to the direction of rotation ω 2 of the second cross flow impeller 10, and air outside the fan assembly 100 can be drawn through the through hole 50 by the airflow emitted from the first air outlet 5 and the second air outlet 6. In fig. 4, the fan assembly 100 is in an original state where no swing operation is performed, and the air flows emitted from the first air outlet 5 and the second air outlet 6 are substantially in the same direction as the axis X.

Fig. 6 shows a state after the swing operation of the fan assembly 100. As can be seen from fig. 6, the original state of the fan assembly 100 shown in fig. 4 is changed after the swing operation. In fig. 6, the rotation direction ω 3 of the first middle housing 1 with respect to the top housing 3 is the same as the rotation direction ω 4 of the second middle housing 2 with respect to the top housing 3, and both are rotated in the clockwise direction, and the air flows emitted from the first air outlet 5 and the second air outlet 6 both flow substantially toward the front left.

Fig. 7 shows another state after the swing operation of the fan assembly 100. In fig. 7, the rotation direction ω 3 of the first middle housing 1 with respect to the top housing 3 is the same as the rotation direction ω 4 of the second middle housing 2 with respect to the top housing 3, and both are rotated in the counterclockwise direction, and the air flows emitted from the first air outlet 5 and the second air outlet 6 both flow substantially toward the right front.

Fig. 8 shows a further state after the swing operation of the fan assembly 100. In fig. 8, the rotation direction ω 3 of the first middle housing 1 relative to the top housing 3 is opposite to the rotation direction ω 4 of the second middle housing 2 relative to the top housing 3, the rotation direction ω 3 of the first middle housing 1 is clockwise, the rotation direction ω 4 of the second middle housing 2 is counterclockwise, and then the airflow emitted from the first air outlet 5 flows approximately toward the left front, and the airflow emitted from the second air outlet 6 flows approximately toward the right front, and the coverage area of the airflow emitted from the whole fan assembly 100 is increased.

Fig. 9 shows a further state after the swing operation of the fan assembly 100. In fig. 9, the rotation direction ω 3 of the first middle housing 1 relative to the top housing 3 is also opposite to the rotation direction ω 4 of the second middle housing 2 relative to the top housing 3, the rotation direction ω 3 of the first middle housing 1 is counterclockwise, the rotation direction ω 4 of the second middle housing 2 is clockwise, and then the airflow emitted from the first air outlet 5 flows approximately toward the right front, and the airflow emitted from the second air outlet 6 flows approximately toward the left front, so that the coverage area of the airflow emitted from the whole fan assembly 100 is reduced.

As can be easily seen from fig. 1 to 9, when the fan assembly 100 swings, the top casing 3 and the bottom casing 4 are always kept stationary, so that the top casing 3 and the bottom casing 4 can be used as fixing components to be fixed or installed on an object such as a wall or a ceiling, which is beneficial to improving the convenience and the stability of the installation or the fixation of the fan assembly and also brings corresponding safety; when the fan assembly 100 swings, only the first middle housing 1 and the second middle housing 2 and the components fixed to the first middle housing 1 and the second middle housing 2 rotate relative to the top housing 3, and the total weight of the first middle housing 1 and the second middle housing 2 and the components fixed to the first middle housing 1 and the second middle housing 2 is relatively light, so that the driving force of the first synchronous motor 13 and the second synchronous motor 14 can be reduced, and the stability of the swing operation is improved; in addition, the size of the space required by the fan component during swinging is the same as that of the space required by the fan component during non-swinging work, so that the space required by the swinging is relatively small; in addition, the fan assembly is simple in structure, and is beneficial to batch production and production cost reduction.

Fig. 10 is a front schematic view of a fan assembly of a second embodiment, fig. 11 is a rear view of the fan assembly shown in fig. 10, fig. 12 is a side view of the fan assembly shown in fig. 10, fig. 13 is a sectional view of the fan assembly taken along line C-C in fig. 10, and fig. 14 is a sectional view of the fan assembly taken along line D-D in fig. 12.

As is apparent from fig. 10 to 14, the fan assembly of this embodiment is similar to that of the first embodiment except that the first and second fixing members 39 and 40 are disposed at different positions. In the present embodiment, both the first fixing member 39 and the second fixing member 40 are disposed outside the housing 80. As is also readily apparent from fig. 10 to 14, in the present embodiment, the structure in the first middle casing 1 and the structure in the second middle casing 2 are relatively simple, and the aesthetic appearance of the entire fan assembly is reduced relative to the first embodiment.

While there have been shown and described what are at present considered to be the preferred embodiments of the invention, it will be obvious to those skilled in the art that various changes and modifications can be made therein without departing from the scope of the invention as defined by the appended claims.

Claims (10)

1. A fan assembly comprises a shell, and a synchronous motor, a first cross-flow impeller, a second cross-flow impeller, a first driving motor and a second driving motor which are positioned in the shell, wherein the first driving motor and the second driving motor respectively drive the first cross-flow impeller and the second cross-flow impeller to rotate and work; the first middle housing and the second middle housing are both located between and spaced apart from the top housing and the bottom housing; the first middle shell is provided with a plurality of first air inlets and a plurality of first air outlets and is fixed with a first volute and a first volute tongue; the second middle shell is provided with a plurality of second air inlets and a plurality of second air outlets and is fixed with a second volute and a second volute tongue; the first cross flow impeller is positioned in the first middle shell, and the second cross flow impeller is positioned in the second middle shell; the fan assembly further comprises a fixing member for fixedly connecting the top casing and the bottom casing together; the first middle shell and the second middle shell can rotate relative to the top shell under the drive of the synchronous motor; air from outside the fan assembly can be drawn through the through-holes by the airflows output from the first and second air outlets.

2. The fan assembly of claim 1 wherein the first drive motor does not follow the rotation of the first midhousing relative to the top housing and the second drive motor does not follow the rotation of the second midhousing relative to the top housing.

3. The fan assembly of claim 1 wherein the first crossflow impeller does not rotate relative to the top casing with the first midsection casing and the second crossflow impeller does not rotate relative to the top casing with the second midsection casing.

4. The fan assembly of claim 1 wherein a securing member is located within the housing.

5. The fan assembly of claim 1 wherein the securing member is located outside of the housing.

6. The fan assembly of claim 1 wherein the synchronous motor comprises a first synchronous motor that simultaneously provides drive to relative rotation of the first and second middle housings through a gear train.

7. The fan assembly of claim 1 wherein the synchronous motor comprises a first synchronous motor and a second synchronous motor; the first middle shell can rotate relative to the top shell under the drive of the first synchronous motor so as to change the direction of the airflow emitted from the first air outlet; the second middle housing can be driven by a second synchronous motor to rotate relative to the top housing to change the direction of the airflow emitted from the second air outlet.

8. The fan assembly of claim 7, wherein the shaft of the first synchronous motor is parallel to the shaft of the second synchronous motor, and the first middle housing rotates in the same direction relative to the top housing as the second middle housing rotates relative to the top housing when the first and second synchronous motors are driven.

9. The fan assembly of claim 7, wherein the shaft of the first synchronous motor is parallel to the shaft of the second synchronous motor, and the first middle housing rotates relative to the top housing in a direction opposite to the direction in which the second middle housing rotates relative to the top housing when driven by the first and second synchronous motors.

10. The fan assembly of claim 7 wherein the shaft of the first synchronous motor is parallel to the shaft of the second synchronous motor; in the first synchronous driving operation mode, the direction of rotation of the first middle housing relative to the top housing is the same as the direction of rotation of the second middle housing relative to the top housing; in the second synchronous drive mode of operation, the first mid-section housing rotates in a direction opposite to the direction in which the second mid-section housing rotates relative to the top housing.

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