CN116771691A - Cross-flow fan, fan and air conditioner - Google Patents

Cross-flow fan, fan and air conditioner Download PDF

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Publication number
CN116771691A
CN116771691A CN202010762225.6A CN202010762225A CN116771691A CN 116771691 A CN116771691 A CN 116771691A CN 202010762225 A CN202010762225 A CN 202010762225A CN 116771691 A CN116771691 A CN 116771691A
Authority
CN
China
Prior art keywords
end plate
flow
impeller
cross
fan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010762225.6A
Other languages
Chinese (zh)
Inventor
张熙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xu Jiqiong
Original Assignee
Xu Jiqiong
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xu Jiqiong filed Critical Xu Jiqiong
Priority to CN202010762225.6A priority Critical patent/CN116771691A/en
Publication of CN116771691A publication Critical patent/CN116771691A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
    • F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0025—Cross-flow or tangential fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A cross-flow fan, a fan and an air conditioner relate to the technical field of electric appliances. The invention provides a cross-flow fan, which comprises an air duct, an impeller and a driving motor, and is characterized by also comprising a flow guiding device and a synchronous motor; the flow guiding device comprises a flow guiding piece positioned in the impeller, and when the impeller rotates under the drive of the driving motor, the flow guiding device does not rotate along with the impeller; the air duct is fixedly connected with the flow guiding device, and the air duct and the flow guiding device can swing under the drive of the synchronous motor. The through-flow fan can prevent the air flow from forming eccentric vortex in the fan so as to reduce noise and improve efficiency, and meanwhile, the driving force required by swinging is smaller, so that the reliability of swinging operation can be effectively improved. The invention also provides a fan with the cross-flow fan and an air conditioner.

Description

Cross-flow fan, fan and air conditioner
Technical Field
The invention relates to the technical field of electric appliances, in particular to a cross-flow fan, a fan with the cross-flow fan and an air conditioner with the cross-flow fan.
Background
The cross-flow fan is widely applied to household appliances and industrial equipment due to the characteristics of simple structure, straight generated air flow and the like. The cross-flow fan is generally composed of a volute, a volute tongue and an impeller, wherein the impeller is multi-blade and long cylindrical and has forward multi-wing blades. The existing through-flow fan can form eccentric vortex affecting the flow of the whole air flow in the through-flow fan, and the formation of the eccentric vortex not only can increase the noise of the through-flow fan, but also can lead the air flow discharged from the impeller to flow back into the impeller, thereby reducing the efficiency of the air flow; in addition, the existing cross-flow fan often adopts the whole machine body to swing so as to enlarge the air outlet range, and the driving force required by the swing is larger, so that the use reliability is affected. The fan and the air conditioner provided with the cross-flow fan have the problems of high noise, low efficiency and low reliability.
Disclosure of Invention
A first object of the present invention is to provide a low-noise, high-efficiency and low-driving force required for swing through-flow fans, a second object of the present invention is to provide a fan having a low-noise, high-efficiency and low-driving force required for swing through-flow fans, and a third object of the present invention is to provide an air conditioner having a low-noise, high-efficiency and low-driving force required for swing through-flow fans, so as to overcome the above-mentioned disadvantages.
In order to achieve the first object of the present invention, a first aspect of the present invention provides a cross-flow fan, which includes an air duct, an impeller, and a driving motor, the impeller includes a plurality of blades arranged at intervals in a circumferential direction, characterized in that the cross-flow fan further includes a flow guiding device and a synchronous motor; the flow guiding device comprises a flow guiding piece positioned in the impeller, and the flow guiding device does not rotate along with the impeller when the impeller rotates under the drive of the driving motor; the air duct comprises a volute and a volute tongue, the air duct is fixedly connected with the flow guiding device, and the air duct and the flow guiding device can swing under the drive of the synchronous motor.
The flow guide piece is used for guiding the flow of the air flow in the impeller so as to prevent the air flow from forming eccentric vortex in the cross-flow fan and prevent or reduce the air discharged from the impeller from flowing back into the impeller; the air duct and the flow guiding device swing under the drive of the synchronous motor so as to change the direction of the air flow output by the cross-flow fan.
Preferably, the flow guiding member is located in the inner cavity of the impeller, and the flow guiding member does not rotate along with the impeller when the impeller rotates under the drive of the driving motor.
Preferably, the flow guide is located near the inner edge of the vane near the volute tongue so as to effectively prevent the airflow from forming an eccentric vortex near the volute tongue.
Preferably, the distance between the guide member and the volute tongue is smaller than the distance between the guide member and the volute.
Preferably, the flow guide is located in the internal cavity of the impeller, the closest distance between the flow guide and the blades of the impeller being between 2 mm and 20 mm; more preferably, the flow guide is located in the internal cavity of the impeller, the closest distance between the flow guide and the blades of the impeller being between 3 and 10 mm.
Preferably, the flow guide comprises a suction end, a blowing end, a first side and a second side.
Preferably, the flow guide is parallel to the axis of rotation of the impeller.
Preferably, the flow guiding device further comprises a left rotating shaft and a right rotating shaft.
In a preferred embodiment, the flow guiding device comprises a left fixing plate, a right fixing plate, a left rotating shaft and a right rotating shaft, wherein the left fixing plate and the right fixing plate are fixedly connected with the flow guiding piece, and the left rotating shaft and the right rotating shaft are respectively fixedly connected with the left fixing plate and the right fixing plate.
Preferably, the air duct comprises an air inlet and an air outlet, and the cross flow fan further comprises an air outlet grille positioned at the air outlet.
In a preferred embodiment, the air duct comprises a left end plate with a through hole and a right end plate with a through hole, the left end and the right end of the volute are respectively fixedly connected with the left end plate and the right end plate, and the left end and the right end of the volute tongue are respectively fixedly connected with the left end plate and the right end plate.
In another preferred embodiment, the air duct further comprises a left end plate with a through hole and a right end plate with a through hole, the through-flow fan further comprises a left fixing frame, a right fixing frame, a left locating ring fixed with the left fixing frame and a right locating ring fixed with the right fixing frame, wherein the left locating ring can extend into the through hole of the left end plate and is rotationally connected with the left end plate, and the right locating ring can extend into the through hole of the right end plate and is rotationally connected with the right end plate.
In yet another preferred embodiment, the air duct includes a left end plate having a through hole and a right end plate having a through hole, the left end plate including a plurality of teeth, and the cross flow fan further includes a drive gear connected to the synchronous motor, wherein the drive gear is meshed with the teeth on the left end plate.
Preferably, the air duct includes a left end plate having a through hole and a right end plate having a through hole, wherein at least a portion of the left end plate is circular.
According to the cross flow fan, the flow guide piece which does not rotate along with the impeller is arranged in the impeller, so that the air flow can be effectively prevented from forming eccentric vortex in the cross flow fan, and the air exhausted from the impeller can be effectively prevented or reduced from flowing back into the impeller, so that the noise of the cross flow fan can be remarkably reduced, and the efficiency of the cross flow fan can be improved; in addition, the air duct and the flow guiding device can swing under the drive of the synchronous motor to change the air outlet direction, and the driving force required by the swing is small, so that the reliability of the swing work is improved.
In order to achieve the second object of the present invention, a second aspect of the present invention provides a fan, which includes the cross flow fan according to the first aspect of the present invention.
The features of the first aspect of the invention described above apply equally to the second aspect of the invention.
Because the fan comprises the cross-flow fan according to the first aspect of the invention, the noise of the fan can be obviously reduced, the efficiency of the fan can be obviously improved, and in addition, the driving force required by swinging is smaller, thereby being beneficial to improving the reliability of swinging operation.
In order to achieve the third object of the present invention, a third aspect of the present invention provides an air conditioner, which includes an indoor unit, and is characterized in that the indoor unit includes the cross flow fan according to the first aspect of the present invention.
The features of the first aspect of the invention described above are equally applicable to the third aspect of the invention.
Because the indoor unit of the air conditioner comprises the cross-flow fan according to the first aspect of the invention, the noise of the air conditioner can be obviously reduced, the efficiency of the air conditioner can be obviously improved, and in addition, the driving force required by swinging is smaller, so that the reliability of swinging work is improved.
Drawings
Fig. l is a schematic diagram of a cross flow fan according to a first embodiment of the present invention.
Fig. 2 is a schematic view of the tunnel of fig. l.
Fig. 3 is a perspective view of the impeller of fig. l.
Fig. 4 is a perspective view of the deflector of fig. l.
Fig. 5 is an enlarged perspective view of the stationary cover in fig. l.
Fig. 6 is an enlarged cross-sectional view of the cross-flow fan taken along line a-a in fig. 1.
Fig. 7 is an enlarged cross-sectional view of the cross-flow fan taken along line B-B in fig. 1.
Fig. 8 is a schematic view of a cross flow fan according to a second embodiment of the present invention.
Fig. 9 is an enlarged cross-sectional view of the cross-flow fan taken along line C-C in fig. 8.
Detailed Description
Fig. l to 7 show a cross-flow fan according to a first embodiment of the present invention. As can be seen from fig. 1 to 7, the cross-flow fan 100 includes a volute casing 1, a volute tongue 2, an impeller 3, and a driving motor 6 for driving the impeller to rotate; the impeller 3 includes a first end plate 17, a second end plate 18, a plurality of blades 5 arranged at intervals in the circumferential direction, a left flange 10, and a right flange 25; the first end plate 17 and the second end plate 18 are circular plates, and two ends of the plurality of blades 5 are fixedly connected with the first end plate 17 and the second end plate 18 respectively; the left flange 10 is fixedly connected with the first end plate 17, and the left flange 10 is provided with a through hole for enabling the left rotating shaft 12 of the flow guiding device 20 to pass through; the right flange 25 is fixedly connected to the second end plate 18, and the right flange 25 has a through hole 29 for enabling the motor shaft 7 of the driving motor 6 to be inserted and fixed.
As can also be seen from fig. 1 to 7, the air duct 30 comprises a left end plate 31, a right end plate 32, a volute 1 and a volute tongue 2; the air duct 30 has an air inlet 41 and an air outlet 42; the volute casing 1 is separated from the volute tongue 2 by a certain distance, the left end and the right end of the volute casing 1 are fixedly connected with the left end plate 31 and the right end plate 32 respectively, and the left end and the right end of the volute tongue 2 are also fixedly connected with the left end plate 31 and the right end plate 32 respectively; the upper portion 311 of the left end plate 31 is substantially circular, and a plurality of teeth are provided on the upper portion 311 of the left end plate 31; the left end plate 31 has a through hole 27 and the right end plate 32 has a through hole 28.
In this embodiment, the cross-flow fan 100 further includes a flow guiding device 20, where the flow guiding device 20 includes a flow guiding member 23, a left fixing plate 21, a right fixing plate 22, a left rotating shaft 12 and a right rotating shaft 13, the left fixing plate 21 and the right fixing plate 22 are all circular plates, the left and right ends of the flow guiding member 23 are respectively fixedly connected with the left fixing plate 21 and the right fixing plate 22, and the left rotating shaft 12 and the right rotating shaft 13 are respectively fixedly connected with the left fixing plate 21 and the right fixing plate 22.
In this embodiment, the cross-flow fan 100 further includes a left fixing frame 15, a right fixing frame 16, and a first connecting member 33, where two ends of the first connecting member 33 are fixed to the left fixing frame 15 and the right fixing frame 16, respectively.
In this embodiment, the cross flow fan 100 further includes a second connecting member 38 and a third connecting member 39, wherein two ends of the second connecting member 38 are respectively fixed to the left rotating shaft 12 of the air guiding device 20 and the left end plate 31 of the air duct 30, and two ends of the third connecting member 39 are respectively fixed to the right rotating shaft 13 of the air guiding device 20 and the right end plate 32 of the air duct 30, so that the air guiding device 20 and the air guiding device 20 can be firmly fixed together.
In the present embodiment, the left flange 10 of the impeller 3 is disposed in the left positioning ring 36 fixed to the left mount 15, and the left flange 10 of the impeller 3 is also disposed in the through hole 27 of the left end plate 31; the right flange 25 of the impeller 3 is arranged in a right positioning ring 37 fixed with the right fixing frame 16, and the right flange 25 of the impeller 3 is also positioned in the through hole 28 of the right end plate 32; a bearing 9 is arranged on the fixed cover 8, the bearing 9 supports the left flange 10 of the impeller 3, the left rotating shaft 12 of the flow guiding device 20 is positioned in the through hole 19 of the fixed cover 8 and is not contacted with the fixed cover 8, and the left rotating shaft 12 of the flow guiding device 20 is also positioned in the through hole 11 of the left flange 10 and is not contacted with the left flange 10; the driving motor 6 is fixedly connected with the right fixing frame 16, the motor shaft 7 of the driving motor 6 is provided with a central through hole, and the right rotating shaft 13 of the flow guiding device 20 is positioned in the central through hole of the motor shaft 7 and is not contacted with the motor shaft 7.
In this embodiment, the flow guide 23, the left fixing plate 21 and the right fixing plate 22 are all located in the inner cavity 4 of the impeller 3. Since the left rotating shaft 12 is not in contact with the left flange 10 of the impeller 3, the right rotating shaft 13 is not in contact with the motor shaft 7, so that the deflector 20 does not rotate along with the impeller 3 when the impeller 3 is rotated in the ω direction by the driving motor 6.
In this embodiment, the fixed cover 8 is fixed to the left fixed frame 15, and a synchronous motor 34 is provided on the left fixed frame 15, the synchronous motor 34 is fixed to a drive gear 35 through its rotation shaft, and the drive gear 35 is engaged with teeth on the left end plate 31. Thus, when the synchronous motor 34 drives the driving gear 35 to rotate or swing, the air duct 30 and the flow guiding device 20 can rotate or swing under the driving of the synchronous motor 34 so as to change the direction of the air flow output by the cross-flow fan 100. Because the driving force required by the swinging of the air duct 30 and the flow guiding device 20 is smaller, the reliability of the swinging operation of the air duct 30 and the flow guiding device is improved.
As is clear from fig. 6, the flow guide 23 is located in the inner cavity 4 of the impeller 3, the impeller 3 comprises a plurality of blades 5 arranged at intervals in the circumferential direction, each blade having an inner edge 51 and an outer edge 52, the flow guide 23 comprises a suction end 231, a discharge end 232, a first side 233 and a second side 234, wherein the first side 233 is a plane, the second side 234 is a convex curved surface, the first side 233 faces the rotational axis X of the impeller 3, and the second side 234 faces away from the rotational axis X of the impeller 3.
In the present embodiment, the impeller 3 is partially located in the space between the volute casing 1 and the volute tongue 2, and the flow guide 23 is disposed near the inner edge of the vane near the volute tongue 2, and the distance between the flow guide 23 and the volute tongue 2 is smaller than the distance between the flow guide 23 and the volute casing 1.
In the present embodiment, the closest distance D1 between the flow guide 23 and the plurality of blades 5 of the impeller is about 4 mm, the distance D2 between the flow guide 23 and the rotation axis X is about 30 mm, and the distance D3 between the blades 5 and the rotation axis X is about 40 mm.
As is easy to see in fig. 6, the flow guiding member 23 is disposed in the inner cavity 4 of the impeller 3, and since the flow guiding member 23 does not rotate along with the impeller 3, when the impeller 3 is driven by the driving motor 6 to rotate, the flow guiding member 23 can effectively prevent the air flow from forming eccentric vortex near the volute tongue 2, and prevent or reduce the air discharged from the impeller 3 from flowing back into the impeller 3, the through-flow fan of the present invention can significantly reduce the noise and improve the efficiency thereof.
Fig. 8 to 9 show a cross-flow fan according to a second embodiment of the present invention. As can be seen from fig. 8 to 9, the cross flow fan of the present embodiment is similar to the cross flow fan of the first embodiment shown in fig. 1 to 7, except that an air outlet grille 40 is added to the first embodiment, and the air outlet grille 40 is located at an air outlet 42 of the cross flow fan 100. The cross flow fan of the embodiment can reduce noise and improve efficiency, and in addition, the driving force required by swinging is smaller, so that the reliability of swinging operation of the cross flow fan is improved.
In fact, the cross-flow fans of both embodiments can be applied to fans or air conditioners, so that the corresponding fans or air conditioners can reduce noise, improve efficiency and reliability of swing operation.
While there has been shown and described what are at present considered to be the preferred embodiments of the invention, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the scope of the invention as defined by the appended claims.

Claims (8)

1. The cross-flow fan comprises an air duct, an impeller and a driving motor, wherein the impeller comprises a plurality of blades which are arranged at intervals in the circumferential direction; the flow guiding device comprises a flow guiding piece positioned in the impeller, and the flow guiding device does not rotate along with the impeller when the impeller rotates under the drive of the driving motor; the air duct comprises a volute and a volute tongue, the air duct is fixedly connected with the flow guiding device, and the air duct and the flow guiding device can swing under the drive of the synchronous motor.
2. The crossflow blower of claim 1 wherein the air duct includes an air inlet and an air outlet, the crossflow blower further comprising an air outlet grille at the air outlet.
3. The through-flow fan of claim 1, wherein the air duct further comprises a left end plate having a through hole and a right end plate having a through hole, the left and right ends of the volute are fixedly connected to the left and right end plates, respectively, and the left and right ends of the volute tongue are also fixedly connected to the left and right end plates, respectively.
4. The cross-flow fan of claim 1, wherein the air duct further comprises a left end plate having a through hole and a right end plate having a through hole, the cross-flow fan further comprises a left fixing frame, a right fixing frame, a left positioning ring fixed to the left fixing frame, and a right positioning ring fixed to the right fixing frame, wherein the left positioning ring can extend into the through hole of the left end plate and is rotatably connected with the left end plate, and the right positioning ring can extend into the through hole of the right end plate and is rotatably connected with the right end plate.
5. The cross flow fan of claim 1, wherein the air duct further comprises a left end plate having a through hole and a right end plate having a through hole, the left end plate comprising a plurality of teeth, the cross flow fan further comprising a drive gear coupled to the synchronous motor, wherein the drive gear meshes with the teeth on the left end plate.
6. The flow-through fan of claim 1, wherein the air duct further comprises a left end plate having a through-hole and a right end plate having a through-hole, wherein at least a portion of the left end plate is circular.
7. A fan comprising the cross flow fan according to any one of claims 1 to 6.
8. An air conditioner comprising an indoor unit, wherein the indoor unit comprises the cross flow fan according to any one of claims 1 to 6.
CN202010762225.6A 2020-08-01 2020-08-01 Cross-flow fan, fan and air conditioner Pending CN116771691A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010762225.6A CN116771691A (en) 2020-08-01 2020-08-01 Cross-flow fan, fan and air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010762225.6A CN116771691A (en) 2020-08-01 2020-08-01 Cross-flow fan, fan and air conditioner

Publications (1)

Publication Number Publication Date
CN116771691A true CN116771691A (en) 2023-09-19

Family

ID=87993575

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010762225.6A Pending CN116771691A (en) 2020-08-01 2020-08-01 Cross-flow fan, fan and air conditioner

Country Status (1)

Country Link
CN (1) CN116771691A (en)

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Application publication date: 20230919

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