CN207539094U - Adjustable diffuser and centrifugal compressor - Google Patents
Adjustable diffuser and centrifugal compressor Download PDFInfo
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- CN207539094U CN207539094U CN201721421529.6U CN201721421529U CN207539094U CN 207539094 U CN207539094 U CN 207539094U CN 201721421529 U CN201721421529 U CN 201721421529U CN 207539094 U CN207539094 U CN 207539094U
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- diffuser
- rotating member
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- drive rod
- adjustable
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- 230000003068 static effect Effects 0.000 abstract description 5
- 238000009792 diffusion process Methods 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 5
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Abstract
The utility model relates to an adjustable diffuser, including static diffuser, activity diffuser and driver part, driver part includes the actuating lever and rotates the piece, sets up the driving groove that extends along circumference on the terminal surface of rotation piece one side, and the degree of depth in driving groove changes along the circumference that rotates gradually, and the one end and the activity diffuser of actuating lever are connected, and the other end of actuating lever stretch into in the driving groove and with the tank bottom butt in driving groove. The utility model discloses still relate to a centrifugal compressor who contains above-mentioned adjustable diffuser. Above-mentioned adjustable diffuser and centrifugal compressor realize the change of adjustable diffuser width through the cooperation of drive groove and guide arm, and the degree of depth in drive groove is direct relevant with the turned angle who rotates the piece, can be convenient adjust the width of adjustable diffuser, and the degree of depth in drive groove has guaranteed the steady of adjusting adjustable diffuser width process and has gone on along the circumference of rotating the piece gently.
Description
Technical field
The utility model is related to Compressor Technology field, more particularly to a kind of adjustable diffuser type and centrifugal compressor.
Background technology
In centrifugal compressor, diffuser can make to be slowed down by the high-speed flow that impeller is discharged, and effectively convert kinetic energy
For pressure energy.Diffuser has large effect to the performance of compressor.Diffuser in centrifugal compressor is divided into adjustable diffusion
Two kinds of device and fixed diffuser.Adjustable diffuser type can in the operational process of centrifugal compressor according to lead leaf divergence into
The corresponding adjustment of row is turbulent to avoid generating.
Traditional adjustable diffuser type is generally driven by cam mechanism or eccentric mechanism, and there are still the processes of adjusting
The problem of unstable and control process is complicated.
Utility model content
Based on this, it is necessary to for traditional adjustable diffuser type during adjusting there are still it is unstable and control process
The problem of complicated, provides a kind of steady adjusting, convenient for the adjustable diffuser type and centrifugal compressor of control.
A kind of adjustable diffuser type, including：
Stationary diffuser；
Movable diffuser is oppositely arranged with the stationary diffuser；And
Driving part including drive rod and rotating member, offers circumferentially on the end face of the rotating member side
Driver slot, the circumferential gradual change of the depth of the driver slot along the rotating member, one end of the drive rod and the work
Dynamic diffuser connection, the other end of the drive rod are stretched into the driver slot and are abutted with the slot bottom of the driver slot；
During the rotating member rotation, the drive rod drives the movable diffuser close or far from the static diffusion
Device.
Become between the depth value of the driver slot and the rotating member angle of revolution in function in one of the embodiments,
Change.
In one of the embodiments, in sine between the angle of revolution of the depth value of the driver slot and the rotating member
Function changes.
The quantity of the driver slot and the drive rod is multiple in one of the embodiments, multiple drivings
Slot is uniformly distributed along the circumferential direction of the rotating member, multiple drive rods respectively with multiple driver slot corresponding matchings and with institute
State movable diffuser connection, multiple drive rods and week of the position that the movable diffuser is connect along the movable diffuser
Edge is uniformly distributed.
The bottom surface of the driver slot is lower arcuate surface in one of the embodiments, the drive rod and the rotating member
One end of abutting is the semiglobe that can be adapted to the lower arcuate surface of the driver slot.
The driving part further includes elastic component in one of the embodiments, and the elastic component is sheathed on the driving
On bar, the elastic component can abut slot bottom of the drive rod always with the driver slot.
The driving part further includes Power Component in one of the embodiments, and the Power Component is passed by gear
Dynamic mode drives the rotating member to rotate.
The Power Component includes motor, driving gear and driven gear ring in one of the embodiments, described driven
Gear ring is arranged and is fixed on the outer rim of the rotating member, and the output shaft of the driving gear and the motor is sequentially connected, described
Driving gear is sequentially connected with the driven gear ring.
A kind of centrifugal compressor, including impeller and diffuser, the impeller is coaxially disposed with the diffuser, the diffusion
Device is said program any one of them adjustable diffuser type.
Inlet guide vane and controller are further included in one of the embodiments, and the controller can control the entrance
Leaf divergence is led, the controller is electrically connected with the motor, and the controller can be according to the aperture control of the inlet guide vane
It makes the motor and carries out the rotation of respective angles so that the aperture of inlet guide vane described in the width adequate of adjustable diffuser type.
Above-mentioned adjustable diffuser type and centrifugal compressor, by being opened in the driver slot of the actuator end face and described
The variation of adjustable diffuser type width, and angle of rotation of the depth of the driver slot directly with the rotating member are realized in the cooperation of guide rod
Degree is related, and easily the width of adjustable diffuser type can be adjusted, the week of the depth of the driver slot along the rotating member
To gradual change, the steady progress for adjusting adjustable diffuser type width process ensure that.
Description of the drawings
Fig. 1 is the fixed structure diagrammatic cross-section that one embodiment of the utility model provides；
Fig. 2 is the adjustable diffuser type that one embodiment of the utility model provides and the assembling schematic diagram of impeller；
Fig. 3 is the rotating member structure of the main view that one embodiment of the utility model provides；
Fig. 4 is the diagrammatic cross-section of rotating member structure shown in Fig. 3.
Wherein：
100- adjustable diffuser types
110- fixed structures
111- hollow cavities
112- outlet air grooves
113- fixed lobes
120- stationary diffusers
130- activity diffusers
140- driving parts
141- Power Components
1411- motors
1412- driving gears
The driven gear rings of 1413-
142- rotating members
1421- driver slots
143- drive rods
144- elastic components
200- impellers
The depth value of d1, d2, d3, d4- driver slot different location
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, by the following examples, it and ties
Attached drawing is closed, a kind of adjustable diffuser type and centrifugal compressor of the utility model are further elaborated.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.On the contrary, when element be referred to as " directly existing " another element " on " when,
There is no intermediary elements.Term as used herein " vertically ", " horizontal ", "left", "right" and similar statement are
For illustrative purposes.Various difference objects are drawn rather than in convenient for enumerating the ratio of explanation by practical group in embodiment attached drawing
The ratio of part is drawn.
As shown in Figures 1 and 2, one embodiment of the utility model provide adjustable diffuser type 100 include fixed structure 110,
Stationary diffuser 120, movable diffuser 130 and driving part 140.Stationary diffuser 120 is fixedly installed on fixed structure
110.Movable diffuser 130 is oppositely arranged with stationary diffuser 120, and movable diffuser 130 can be close or far from static expansion
Depressor 120.Driving part 140 includes Power Component 141, drive rod 143 and rotating member 142.Rotating member 142 is rotatably dispose in
Fixed structure 110, rotating member 142 can be rotated by Power Component 141.It is offered on the end face of 142 side of rotating member
Driver slot 1421 circumferentially.Circumferential gradual change of the depth of driver slot 1421 along rotating member 142.Drive rod 143
One end is connect with movable diffuser 130, the other end of drive rod 143 stretch into driver slot 1421 and with the slot bottom of driver slot 1421
It abuts.When rotating member 142 rotates, 143 drive activity diffuser of drive rod, 130 close or separate stationary diffuser 120.On
Adjustable diffuser type 100 is stated, adjustable diffuser type 100 is realized by being opened in the cooperation of driver slot 1421 and guide rod of actuator end face
The variation of width, and the depth of driver slot 1421 is directly related to the rotational angle of the rotating member 142, can convenient pair can
The width of diffuser 100 is adjusted to be adjusted.Circumferential gradual change of the depth of the driver slot 1421 along rotating member 142 will turn
The convert rotational motion of moving part 142 is the linear motion of movable diffuser 130, ensure that and adjusts 100 width mistake of adjustable diffuser type
The steady progress of journey.
The effect of fixed structure 110 provided by the utility model is the other parts of support, as long as support can be realized
Function, the utility model are not intended to limit the way of realization of fixed structure 110.It is understood that fixed structure 110 can be with
A part for individual fixed structure or centrifugal compressor body.In one embodiment of the utility model, fixed structure
110 as shown in Figure 1.Whole fixed structure 110 is in the revolving body with circular hollow cavity 111.The end face of fixed structure 110
On be further opened with circular outlet air groove 112, the diameter of outlet air groove 112 is more than the diameter of hollow cavity 111, outlet air groove
112 connect with hollow cavity 111.Between stationary diffuser 120 is opposite with the end face that fixed structure 110 opens up outlet air groove 112
Every setting.Movable diffuser 130 is movably set in the connection changeover portion of hollow cavity 111 and outlet air groove 112, movable diffuser
130 can be close to or far from stationary diffuser 120 to change the diffusion width of flow path of adjustable diffuser type 100.The present embodiment carries
The fixed structure 110 of confession is cast form or machined after forming.
Further, as shown in Figure 1, side of the fixed structure 110 far from outlet air groove 112 has cylindric fixed lobe
113, the hollow cavity 111 of fixed structure 110 runs through the center of fixed lobe 113.Rotating member 142 is annular in shape, rotating member 142
Inner ring is rotatably dispose in the fixed lobe 113 of fixed structure 110.In other examples, rotating member 142 can also be plate-like
Or other shapes.As a kind of achievable mode, rotating member 142 is rotatably dispose in fixed lobe 113 by rolling bearing,
Substantially reduce the rotation friction between rotating member 142 and fixed lobe 113.Optionally, rolling bearing is deep groove ball bearing,
It is interference fit between the inner ring of rotating member 142 and the outer ring of rolling bearing, generally selects N7/h6.For ease of by rotating member 142
And rolling bearing is fixed on the extending direction of fixed lobe 113, the outer rim of fixed lobe 113 has fixed stop.It is fixed
Block locks nut and rotating member 142 and rolling bearing is carried out axial restraint.Optionally, fixed stop is convex in fixation
Multiple protrusions of the circumferentially spaced setting in 113 outer surfaces are played either in the circumferentially arranged ring-type in 113 outer surface of fixed lobe
Protrusion.The outer surface of fixed lobe 113 offers screw thread, and locking nut can be connect with the outer surface thread of fixed lobe 113.
As shown in figure 3, in one embodiment of the utility model, driver slot 1421 is opened in the end face of annular rotary element 142,
Change between 142 angle of revolution of depth value and rotating member of driver slot 1421 in function, convenient for the angle of rotation according to rotating member 142
Spend the variation of the distance between calculating activity diffuser 130 and stationary diffuser 120.Further, the depth value of driver slot 1421
It is in varies with sinusoidal function between the angle of revolution of rotating member 142.By the revolution of the depth value of driver slot 1421 and rotating member 142
Sine relation is designed as between angle, convenient for the angle that is turned over according to rotating member 142 quickly calculating activity diffuser 130 with it is static
The distance between diffuser 120 variation, you can adjust the variation of the diffusion width of flow path of diffuser 100.Further, along rotating member
The angular range of the central angle of circular arc is 60 ° to 90 ° corresponding to the driver slot 1421 of 142 circumferentially extendings, and driver slot 1421 is most
The variation range of big depth difference is 20mm-50mm, you can adjusts the diffusion runner maximum width of diffuser 100 and the difference of minimum widith
Value range is 20mm-500mm.In a specific embodiment, the angle model of the central angle of circular arc corresponding to driver slot 1421
It is 65 ° to enclose, and the depth capacity difference of driver slot 1421 is 30mm.As shown in Figures 3 and 4, when rotating member 142 rotates counterclockwise, with
The depth for the driver slot 1421 that drive rod 143 abuts gradually increases, i.e. d4 ＞ d3 ＞ d2 ＞ d1.
In one embodiment of the utility model, as shown in Fig. 2, the quantity of driver slot 1421 and drive rod 143 is multiple,
Multiple driver slots 1421 along the circumferentially distributed of rotating member 142, multiple drive rods 143 respectively with multiple 1421 corresponding matchings of driver slot
And it is connect with the different location of movable 130 periphery of diffuser.The setting of multiple driver slots 1421 and multiple drive rods 143, can
The various pieces of movable diffuser 130 are adjusted simultaneously, ensure that between movable diffuser 130 and stationary diffuser 120
The accuracy of distance adjustment.Further, multiple driver slots 1421 are uniformly distributed along the circumferential direction of rotating member 142, multiple drive rods 143
It is uniformly distributed with the position that movable diffuser 130 is connect along the periphery of movable diffuser 130.Equally distributed 1421 He of driver slot
Drive rod 143 ensure that the stability of the distance adjustment process between movable diffuser 130 and stationary diffuser 120.It is using
In the process, 1421 uniform stressed of each drive rod 143 and driver slot, even wearing.Need replacing drive rod 143 or rotating member
It once can all be replaced when 142, and then ensure that distance adjustment process between movable diffuser 130 and stationary diffuser 120
Stability.
In one embodiment of the utility model, 110 upper edge of the fixed structure gyratory directions of itself are uniformly provided with three and lead to
Hole, the connection changeover portion of three through-hole perforation hollow cavities 111 and outlet air groove 112.Driver slot 1421 and drive rod 143
Quantity is also three, and three driver slots 1421 are uniformly distributed along the circumferential direction of rotating member 142, and three drive rods 143 are arranged in respectively
Three through-holes on fixed structure 110.Three one end of drive rod 143 far from rotating member 142 respectively with movable diffuser 130
Edge connects.As a kind of achievable mode, the edge of movable diffuser 130 is uniformly provided with three through-holes, drive rod 143
There is linkage section close to one end of activity diffuser 130, the diameter of linkage section is threaded through fixed structure 110 less than drive rod 143
Partial diameter.The linkage section of three drive rods 143 is arranged in respectively in three through-holes of movable diffuser 130, is then used
Locking nut carries out axial restraint.
In one embodiment of the utility model, the bottom surface of driver slot 1421 is lower arcuate surface, drive rod 143 and rotating member
142 one end abutted are the semiglobes that can be adapted to the lower arcuate surface of driver slot 1421.Driver slot with lower arcuate surface
1421 mutually abut with the drive rod 143 of hemisphere end face, substantially reduce the driver slot 1421 in the rotation process of rotating member 142
With the frictional force between drive rod 143.Optionally, the main part of drive rod 143 can be columned or other
Shape.In the present embodiment, the main part of drive rod 143 is cylindric, and whole cylindrical drive rod 143 is arranged in
In fixed structure 110, and it can be slided in the through-hole of fixed structure 110.Further, drive rod 143 and fixed structure 110 it
Between be additionally provided with linear bearing, to reduce frictional force of the drive rod 143 in sliding process between fixed structure 110.
In one embodiment of the utility model, as shown in Fig. 2, driving part 140 further includes elastic component 144, elastic component 144
It is sheathed on drive rod 143, elastic component 144 can drive slot bottom of the drive rod 143 always with driver slot 1421 to abut.Elastic component
144 have the characteristics that simple in structure, performance is stable, at low cost.Specifically, drive rod 143 has close to one end of rotating member 142
Locking nut, elastic component 144 are set to end face of the fixed structure 110 far from outlet air groove 112 with drive rod 143 close to rotation
Between the locking nut of one end of part 142.When rotating member 142 by 143 drive activity diffuser 130 of drive rod close to static expansion
During depressor 120, drive rod 143 is abutted by the position deeper with driver slot 1421 to be transitioned into the position shallower with driver slot 1421 and supports
It connects, elastic component 144 bears pressure and flexible deformation occurs.When rotating member 142 inverts, under the promotion of elastic component 144, driving
Bar 143 is abutted by the position shallower with driver slot 1421 to be transitioned into the position deeper with driver slot 1421 and abuts.Elastic component 144
Effect be drive activity diffuser 130 far from stationary diffuser 120, and ensure bottom of the drive rod 143 always with driver slot 1421
Face abuts.Optionally, elastic component 144 is spring.
In one embodiment of the utility model, as shown in Figures 2 and 4, Power Component 141 is driven by gear-driven mode
Turn moving part 142 rotates.By having the characteristics that high transmission accuracy, transmission process are stablized between precision machined gear.As
A kind of achievable mode, Power Component 141 include motor 1411, driving gear 1412 and driven gear ring 1413, driven tooth
Circle 1413 is arranged and is fixed on the outer rim of rotating member 142, and driving gear 1412 and the output shaft of motor 1411 are sequentially connected, actively
Gear 1412 is sequentially connected with driven gear ring 1413.Further, pass through between the output shaft of motor 1411 and driving gear 1412
Key connection.Engaged transmission between driving gear 1412 and driven gear ring 1413.The inner ring of driven gear ring 1413 and rotating member 142
Interference connects between outer ring.In a specific embodiment, motor 1411 is asynchronous machine.In other examples, it is electric
Machine 1411 is other kinds of motor.Certainly, in the other embodiment of the utility model, driven gear ring 1413 can also be to set
The teeth portion being placed in 142 outer rim of rotating member.
The utility model also provides a kind of centrifugal compressor, and including impeller 200 and diffuser, impeller 200 and diffuser are same
Axis is set, and diffuser is said program any one of them adjustable diffuser type 100.Impeller 200 is arranged in fixed structure 110
Cavity body 111 and the connection changeover portion of outlet air groove 112.Impeller 200 realizes rotation by the main shaft being fixedly connected with itself.Leaf
The axis of 200 main shafts of itself of wheel is overlapped with the centre of gyration of fixed structure 110.Further, centrifugal compressor further includes entrance
Guide vane and controller, controller can control the aperture of inlet guide vane, and controller is electrically connected with motor 1411, and controller being capable of root
The rotation of respective angles is carried out so that the width adequate entrance of adjustable diffuser type 100 according to the aperture control motor 1411 of inlet guide vane
Lead leaf divergence.Linkage between guide vane opening and the exit width of adjustable diffuser type 100 is realized by controller, is not only easy to
It realizes, and of low cost.When the aperture increase of inlet guide vane, driving part 140 drives rotating member 142 to rotate counterclockwise,
Under the promotion of elastic component 144, movable diffuser 130 is far from stationary diffuser 120 to increase the width of diffusion runner.When entrance is led
When leaf divergence reduces, driving part 140 drives rotating member 142 to rotate clockwise, and under the promotion of drive rod 143, activity is expanded
Depressor 130 is close to stationary diffuser 120 to reduce the width of diffusion runner.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed,
But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of adjustable diffuser type, which is characterized in that including：
Stationary diffuser (120)；
Movable diffuser (130), is oppositely arranged with the stationary diffuser (120)；And
Driving part (140), including drive rod (143) and rotating member (142), on the end face of rotating member (142) side
Offer driver slot (1421) circumferentially, the circumferential direction of the depth of the driver slot (1421) along the rotating member (142)
Gradual change, one end of the drive rod (143) are connect with the movable diffuser (130), the drive rod (143) it is another
End is stretched into the driver slot (1421) and is abutted with the slot bottom of the driver slot (1421)；
During rotating member (142) rotation, the drive rod (143) drives the movable diffuser (130) close or separate
The stationary diffuser (120).
2. adjustable diffuser type according to claim 1, which is characterized in that the depth value of the driver slot (1421) with it is described
Change between rotating member (142) angle of revolution in function.
3. adjustable diffuser type according to claim 2, which is characterized in that the depth value of the driver slot (1421) with it is described
It is in varies with sinusoidal function between the angle of revolution of rotating member (142).
4. adjustable diffuser type according to claim 1, which is characterized in that the driver slot (1421) and the drive rod
(143) quantity is multiple, and multiple driver slots (1421) are uniformly distributed along the circumferential direction of the rotating member (142), multiple
The drive rod (143) connect respectively with multiple driver slot (1421) corresponding matchings and with the movable diffuser (130),
Multiple drive rods (143) and periphery of the position that the movable diffuser (130) connect along the movable diffuser (130)
It is uniformly distributed.
5. adjustable diffuser type according to claim 1, which is characterized in that the bottom surface of the driver slot (1421) is arcuate bottom
Face, the drive rod (143) is with one end that the rotating member (142) abuts can be with the arcuate bottom of the driver slot (1421)
The semiglobe of face adaptation.
6. adjustable diffuser type according to claim 1, which is characterized in that the driving part (140) further includes elastic component
(144), the elastic component (144) is sheathed on the drive rod (143), and the elastic component (144) can make the drive rod
(143) slot bottom always with the driver slot (1421) abuts.
7. according to claim 1-6 any one of them adjustable diffuser types, which is characterized in that the driving part (140) is also wrapped
Power Component (141) is included, the Power Component (141) drives the rotating member (142) to rotate by gear-driven mode.
8. adjustable diffuser type according to claim 7, which is characterized in that the Power Component (141) is including motor
(1411), driving gear (1412) and driven gear ring (1413), the driven gear ring (1413) are arranged and are fixed on described turn
The outer rim of moving part (142), the driving gear (1412) and the output shaft of the motor (1411) are sequentially connected, the driving tooth
(1412) are taken turns to be sequentially connected with the driven gear ring (1413).
9. a kind of centrifugal compressor, including impeller (200) and diffuser, the impeller (200) is coaxially disposed with the diffuser,
It is characterized in that, the diffuser is claim 1-8 any one of them adjustable diffuser type (100).
10. a kind of centrifugal compressor, which is characterized in that including described in impeller (200), inlet guide vane, controller and claim 8
Adjustable diffuser type (100)；The impeller (200) is coaxially disposed with the adjustable diffuser type (100), and the controller can be controlled
The aperture of the inlet guide vane is made, the controller is electrically connected with the motor (1411), and the controller can be according to described
The aperture of inlet guide vane controls the motor (1411) to carry out the rotation of respective angles so that the width of adjustable diffuser type (100) is fitted
Answer the aperture of the inlet guide vane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721421529.6U CN207539094U (en) | 2017-10-30 | 2017-10-30 | Adjustable diffuser and centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721421529.6U CN207539094U (en) | 2017-10-30 | 2017-10-30 | Adjustable diffuser and centrifugal compressor |
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| Publication Number | Publication Date |
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| CN207539094U true CN207539094U (en) | 2018-06-26 |
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ID=62611726
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| CN201721421529.6U Active CN207539094U (en) | 2017-10-30 | 2017-10-30 | Adjustable diffuser and centrifugal compressor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107654419A (en) * | 2017-10-30 | 2018-02-02 | 珠海格力电器股份有限公司 | Adjustable diffuser and centrifugal compressor |
| CN109764001A (en) * | 2019-03-18 | 2019-05-17 | 重庆通用工业(集团)有限责任公司 | Outlet regulating device and centrifugal refigerating compressor |
| CN111852908A (en) * | 2019-04-30 | 2020-10-30 | 广东美的制冷设备有限公司 | Fan assembly and air conditioner |
-
2017
- 2017-10-30 CN CN201721421529.6U patent/CN207539094U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107654419A (en) * | 2017-10-30 | 2018-02-02 | 珠海格力电器股份有限公司 | Adjustable diffuser and centrifugal compressor |
| CN109764001A (en) * | 2019-03-18 | 2019-05-17 | 重庆通用工业(集团)有限责任公司 | Outlet regulating device and centrifugal refigerating compressor |
| CN111852908A (en) * | 2019-04-30 | 2020-10-30 | 广东美的制冷设备有限公司 | Fan assembly and air conditioner |
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