CN215409408U - Centrifugal fan blade, fan and air conditioner indoor unit - Google Patents
Centrifugal fan blade, fan and air conditioner indoor unit Download PDFInfo
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- CN215409408U CN215409408U CN202121691081.6U CN202121691081U CN215409408U CN 215409408 U CN215409408 U CN 215409408U CN 202121691081 U CN202121691081 U CN 202121691081U CN 215409408 U CN215409408 U CN 215409408U
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Abstract
The utility model provides a centrifugal fan blade, a fan and an air conditioner indoor unit, wherein the centrifugal fan blade, the fan and the air conditioner indoor unit comprise a bottom plate and a plurality of blades, and the plurality of blades are arranged at intervals along the periphery of the bottom plate to form an annular structure; the blade is provided with an inlet section and an outlet section which are connected with each other, the outlet section is positioned on one side of the inlet section close to the edge of the bottom plate, the inlet section and the outlet section are both of arc structures, and a connecting end is formed at the connecting position of the inlet section and the outlet section; wherein, the tangent line of the inlet section at the connecting end is L5, the tangent line of the outlet section at the connecting end is L6, the included angle between L5 and L6 is gamma, and the gamma is more than or equal to 160 degrees and less than or equal to 165 degrees. Through the technical scheme provided by the utility model, the technical problem that the centrifugal fan blade in the prior art has low working efficiency on airflow can be solved.
Description
Technical Field
The utility model relates to the technical field of centrifugal fan blades, in particular to a centrifugal fan blade, a fan and an air conditioner indoor unit.
Background
At present, centrifugal fan blades are widely applied to various air conditioning devices, and are particularly widely used on products such as a dehumidifier, an air purifier, a cabinet air conditioner and the like. The centrifugal fan blade, the volute and the motor form a complete fan, wherein the centrifugal fan blade is the most main acting part, when the motor drives the centrifugal fan blade to rotate at a high speed, air in the volute is thrown out of the centrifugal fan blade under the action of centrifugal force and is pressed and conveyed out of the centrifugal fan through the volute air outlet, and negative pressure is generated around the centrifugal fan blade due to the fact that the air is thrown out, so that external air is continuously supplemented from the volute air inlet.
However, the centrifugal fan blade in the prior art has low working efficiency on airflow, large noise and small output air volume, and when a large air supply volume needs to be achieved, the required motor rotating speed is high and the energy consumption is large.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a centrifugal fan blade, a fan and an air conditioner indoor unit, and aims to solve the technical problem that the centrifugal fan blade in the prior art is low in air flow working efficiency.
In order to achieve the above object, according to one aspect of the present invention, there is provided a centrifugal fan blade comprising: the blade comprises a base plate and a plurality of blades, wherein the plurality of blades are arranged at intervals along the periphery of the base plate to form an annular structure; the blade is provided with an inlet section and an outlet section which are connected with each other, the outlet section is positioned on one side of the inlet section close to the edge of the bottom plate, the inlet section and the outlet section are both of arc structures, and a connecting end is formed at the connecting position of the inlet section and the outlet section; wherein, the tangent line of the inlet section at the connecting end is L5, the tangent line of the outlet section at the connecting end is L6, the included angle between L5 and L6 is gamma, and the gamma is more than or equal to 160 degrees and less than or equal to 165 degrees.
Furthermore, one end of the inlet section, which is far away from the outlet section, forms an inlet end, and a plurality of inlet ends form an inner circular ring; the tangent line of a circle where the inlet end and the inner circular ring are located is L1, the tangent line of the inlet end of the inlet section is L2, the included angle between L1 and L2 is alpha, and the alpha is more than or equal to 60 degrees and less than or equal to 70 degrees.
Furthermore, an outlet end is formed at one end of the outlet section, which is far away from the inlet section, and a plurality of outlet ends are enclosed to form an outer circular ring; the tangent line of a circle where the outlet end and the outer ring are located is L3, the tangent line of the outlet section at the outlet end is L4, the included angle between L3 and L4 is beta, and the beta is more than or equal to 150 degrees and less than or equal to 170 degrees.
Furthermore, one end of the inlet section, which is far away from the outlet section, forms an inlet end, a plurality of inlet ends form an inner circular ring, and the diameter of a circle in which the inner circular ring is located is D1; the outlet section is an outlet end formed at one end of the outlet section far away from the inlet section, a plurality of outlet ends surround an outer ring, and the diameter of a circle where the outer ring is located is D2; D1/D2 is more than or equal to 0.8 and less than or equal to 0.88.
Furthermore, the number of the blades is Z, and Z is more than or equal to 50 and less than or equal to 60.
Furthermore, an inlet end is formed at one end of the inlet section, which is far away from the outlet section, the distance between the inlet ends of two adjacent blades is d1, and d1 is more than or equal to 11.5mm and less than or equal to 15 mm.
Furthermore, an outlet end is formed at one end of the outlet section far away from the inlet section, the distance between the outlet ends of two adjacent blades is d2, and d2 is more than or equal to 10mm and less than or equal to 13 mm.
Furthermore, an outlet end is formed at one end of the outlet section, which is far away from the inlet section, and a plurality of outlet ends are enclosed to form an outer circular ring; the tangent line of the circle where the outlet end and the outer ring are located is L3, the tangent line of the outlet section at the outlet end is L4, and the included angle between L3 and L4 is beta; wherein α is 65 °; and/or, β 156 °; and/or, γ 162 °.
Further, the number of the blades is Z, and Z is 54; and/or the distance between the inlet ends of two adjacent blades is d1, and d1 is 13 mm; and/or the distance between the outlet ends of two adjacent blades is d2, and d2 is 11.5 mm.
According to another aspect of the utility model, a fan is provided, which comprises a centrifugal fan blade, a volute and a motor, wherein the centrifugal fan blade and the motor are both arranged in the volute, the motor is connected with the centrifugal fan blade, and the centrifugal fan blade is the centrifugal fan blade provided above.
According to another aspect of the utility model, an indoor unit of an air conditioner is provided, and the indoor unit of the air conditioner comprises an indoor unit shell and a fan, wherein the fan is arranged in the indoor unit shell, and the fan is the fan.
By applying the technical scheme of the utility model, the gamma is set in the range, the angle between the inlet section and the outlet section is changed, the blade shape of the fan blade is optimized, the flow condition of airflow between the blades can be improved, the airflow between the blades is increased, the acting capacity of the blades on the airflow is enhanced, and the efficiency of the centrifugal fan blade is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 illustrates a schematic view of an inlet angle of a blade provided in accordance with an embodiment of the present invention;
FIG. 2 illustrates a schematic view of an exit angle of a blade provided in accordance with an embodiment of the present invention;
FIG. 3 illustrates a schematic view of a deflection angle of a blade provided in accordance with an embodiment of the present invention;
FIG. 4 shows a schematic diagram of d1 and d2 provided according to an embodiment of the utility model;
FIG. 5 illustrates a schematic positional diagram of an inner ring and an outer ring provided in accordance with an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a centrifugal blade according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a wind turbine according to a second embodiment of the present invention;
FIG. 8 illustrates a cross-sectional view of a fan provided in accordance with an embodiment two of the present invention;
fig. 9 is a schematic view illustrating noise levels of centrifugal blades according to different air volumes of the centrifugal blade according to an embodiment of the present invention;
fig. 10 is a schematic diagram illustrating power magnitudes of centrifugal blades provided according to an embodiment of the present invention at different wind rates;
FIG. 11 illustrates an interlobe flow field diagram of a prior art centrifugal fan blade;
fig. 12 shows an inter-blade flow field diagram of a centrifugal fan blade according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a centrifugal fan blade; 11. a base plate; 12. a blade; 121. an inlet section; 122. an outlet section; 20. a volute; 30. a motor; 31. a motor shaft; 40. and (7) mounting the plate.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 8, a first embodiment of the present invention provides a centrifugal fan blade 10, where the centrifugal fan blade 10 includes a bottom plate 11 and a plurality of blades 12, the plurality of blades 12 are arranged at intervals along a circumference of the bottom plate 11 to form an annular structure. The blade 12 has an inlet section 121 and an outlet section 122 connected to each other, the inlet section 121 is of an arc-shaped structure, the outlet section 122 is located on one side of the inlet section 121 close to the edge of the bottom plate 11, one end of the inlet section 121 far away from the outlet section 122 forms an inlet end, and a plurality of inlet ends form an inner circular ring. Specifically, the inlet section 121 and the outlet section 122 in this embodiment are both arc-shaped structures, the connection point of the inlet section 121 and the outlet section 122 forms a connection end, the tangent of the inlet section 121 at the connection end is L5, the tangent of the outlet section 122 at the connection end is L6, the included angle between L5 and L6 is γ (γ is also called the deflection angle of the blade 12), and γ is greater than or equal to 160 ° and less than or equal to 165 °. Specifically, the center of the inner ring in this embodiment is the axis of the centrifugal fan blade 10.
By adopting the centrifugal fan blade provided by the embodiment, the gamma is arranged in the angle range, the working capacity of the pressure surface of the blade 12 can be increased, the blade shape of the fan blade can be further optimized, the deflection angle of the whole blade 12 is increased, the working capacity of the blade 12 on airflow is enhanced, and the efficiency of the centrifugal fan blade 10 is improved.
Specifically, the end of the inlet section 121 far from the outlet section in this embodiment forms an inlet end, a tangent line of a circle where the inlet end and the inner circular ring are located is L1, a tangent line of the inlet section 121 at the inlet end is L2, an included angle between L1 and L2 is α, and α is greater than or equal to 60 ° and less than or equal to 70 °. In this embodiment, α may be referred to as an entrance angle.
By adopting the centrifugal fan blade 10 provided by the embodiment, the blade shape of the fan blade can be optimized by setting the angle alpha within the angle range, the flow condition of the airflow between the blades 12 is improved, the airflow between the blades 12 is increased, the acting capacity of the blades 12 on the airflow is enhanced, and the efficiency of the centrifugal fan blade 10 is improved.
In this embodiment, the outlet section 122 has an arc-shaped structure, the outlet section 122 is an outlet end formed at an end of the outlet section 122 away from the inlet section 121, and a plurality of outlet ends surround an outer ring; the tangent line of a circle where the outlet end and the outer ring are located is L3, the tangent line of the outlet section 122 at the outlet end is L4, the included angle between L3 and L4 is beta (outlet angle), and the beta is more than or equal to 150 degrees and less than or equal to 170 degrees. By adopting the structure, the blade shape of the fan blade can be optimized by setting the beta in the angle range, the flow condition of the airflow between the blades 12 is improved, the airflow between the blades 12 is increased, the working capacity of the blades 12 on the airflow is enhanced, and the efficiency of the centrifugal fan blade 10 is improved. Specifically, the center of the circle of the outer ring in this embodiment is the axis of the centrifugal fan blade 10.
In this embodiment, the diameter of the circle in which the inner circular ring is located is D1, the outlet section 122 is an outlet end formed at one end of the outlet section 122 away from the inlet section 121, the outlet ends surround an outer circular ring, the diameter of the circle in which the outer circular ring is located is D2, and D1/D2 is not less than 0.8 and not more than 0.88. By adopting the structure, the ratio is set in the range, the airflow flowing condition among the blades 12 can be improved, the airflow among the blades 12 is increased, the acting capacity of the blades 12 on the airflow is enhanced, and the efficiency of the centrifugal fan blade 10 is improved.
Specifically, the number of the blades 12 in the embodiment is Z, and Z is more than or equal to 50 and less than or equal to 60. With such a configuration, the number of the blades 12 is set within the above range, so that the number of the blades 12 can be rationalized, the phenomenon of flow separation of the flow passages between the blades 12 can be reduced, and the ventilation volume between the blades 12 can be increased. Due to the important parameters that the number of the blades 12 is directly related to the aerodynamic performance of the fan, an excessive number of the blades 12 may cause the flow channel of the centrifugal fan blade 10 to generate a secondary vortex, and an excessive number of the blades 12 may decrease the effective flow area of the gas, which may cause the impeller inlet impact loss and the in-process friction loss of the centrifugal fan blade 10 to be aggravated, and may also increase the load of the centrifugal fan blade 10 at all times, and decrease the total pressure and the efficiency of the fan.
In the embodiment, the distance between the inlet ends of two adjacent blades 12 is d1, and d1 is more than or equal to 11.5mm and less than or equal to 15 mm. By adopting the structure, the distance between the inlet ends of two adjacent blades 12 is set in the range, so that the airflow flowing condition between the blades 12 can be improved, the airflow between the blades 12 is increased, the acting capacity of the blades 12 on the airflow is enhanced, and the efficiency of the centrifugal fan blade 10 is improved.
Specifically, the outlet section 122 in this embodiment is an outlet end formed at an end of the outlet section 122 far from the inlet section 121, a distance between the outlet ends of two adjacent blades 12 is d2, and d2 is greater than or equal to 10mm and less than or equal to 13 mm. By adopting the structure, the distance between the outlet ends of two adjacent blades 12 is set in the range, so that the airflow flowing condition between the blades 12 can be improved, the airflow between the blades 12 is increased, the working capacity of the blades 12 on the airflow is enhanced, and the efficiency of the centrifugal fan blade 10 is improved.
In the present embodiment, the junction of the inducer 121 and the exducer 122 forms the connecting end, the tangent of the inducer 121 at the connecting end is L5, the tangent of the exducer 122 at the connecting end is L6, and the angle between L5 and L6 is γ; wherein α is 65 °; and/or, β 156 °; and/or, γ 162 °.
Preferably, in the embodiment, the angle α is 65 °, β is 156 °, and γ is 162 °, so that the airflow flowing condition between the blades 12 can be better improved, the airflow quantity between the blades 12 can be increased, the working capacity of the blades 12 on the airflow can be enhanced, and the efficiency of the centrifugal fan blade 10 can be improved.
Specifically, the number of the blades 12 is Z, and Z is 54; and/or the distance between the inlet ends of two adjacent blades 12 is d1, and d1 is 13 mm; and/or the distance between the outlet ends of two adjacent blades 12 is d2, and d2 is 11.5 mm.
Preferably, d 1-13 mm and d 2-11.5 mm in this embodiment. By adopting the structure, the flowing condition of the air flow can be further optimized conveniently, so that the air flow between the blades 12 can be increased better, the working capacity of the blades 12 on the air flow can be increased better, and the efficiency of the centrifugal fan blade 10 can be improved better.
As shown in fig. 9 and 10, it can be seen that the optimized centrifugal fan blade 10 can effectively improve the air flow passing capability. As can be seen from the comparison between fig. 11 and fig. 12, when the flow field diagrams before and after the optimization are compared, the air flow passing capability between the blades 12 of the optimized centrifugal fan blade 10 is strong, the vortex flow area between the blades 12 is significantly reduced (corresponding to the upper left corner in the diagram), and the reduction of the vortex flow between the blades 12 can significantly reduce the aerodynamic noise of the centrifugal fan blade 10. The reduction of the vortex between the blades 12 of the centrifugal fan blade 10 designed by the utility model can obviously reduce the starting noise of the centrifugal fan blade 10. By optimizing the blade shape of the blade 12, the air flow can enter the impeller from the axial direction of the centrifugal fan blade 10 to the radial direction of the blade 12 entering the centrifugal fan blade 10 more smoothly, the deflection angle of the blade 12 increases the acting capacity of the pressure surface of the blade 12, and the efficiency of the centrifugal fan is improved.
The second embodiment of the utility model provides a fan, which comprises a centrifugal fan blade 10, a volute 20 and a motor 30, wherein the centrifugal fan blade 10 and the motor 30 are both installed in the volute 20, the motor 30 is connected with the centrifugal fan blade 10, and the centrifugal fan blade 10 is the centrifugal fan blade 10 provided by the second embodiment. Specifically, the centrifugal fan blade 10 is installed inside the volute casing 20, the motor 30 is fixed on the installation plate 40, the installation hole of the motor shaft 31 of the centrifugal fan blade 10 penetrates through the motor shaft 31 and is fixed on the motor 30, and then the motor 30 is installed and fixed on the volute casing 20, namely the centrifugal fan is assembled. A bottom plate 11 of the centrifugal fan blade 10 is provided with a raised motor installation position, and heat dissipation holes are formed in the raised motor installation position and used for dissipating heat of the motor 30.
The third embodiment of the utility model provides an indoor unit of an air conditioner, which comprises an indoor unit shell and a fan, wherein the fan is arranged in the indoor unit shell, and the fan is the fan provided by the third embodiment.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the working efficiency of the centrifugal fan blades on the air flow is increased, the noise is reduced, and the required motor rotating speed is low and the power consumption is low under the condition of achieving the same air volume.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A centrifugal fan blade, comprising:
the blade assembly comprises a bottom plate (11) and a plurality of blades (12), wherein the blades (12) are arranged at intervals along the periphery of the bottom plate (11) to form an annular structure;
the blade (12) is provided with an inlet section (121) and an outlet section (122) which are connected with each other, the outlet section (122) is positioned on one side of the inlet section (121) close to the edge of the bottom plate (11), the inlet section (121) and the outlet section (122) are both in arc structures, and the connecting position of the inlet section (121) and the outlet section (122) forms a connecting end;
wherein the tangent of the inlet section (121) at the connecting end is L5, the tangent of the outlet section (122) at the connecting end is L6, the angle between L5 and L6 is γ, 160 ° ≦ γ ≦ 165 °.
2. The centrifugal fan blade according to claim 1, wherein one end of the inlet section (121) far from the outlet section (122) forms an inlet end, and a plurality of inlet ends surround an inner ring; a tangent line of a circle where the inlet end and the inner circular ring are located is L1, a tangent line of the inlet section (121) at the inlet end is L2, an included angle between L1 and L2 is alpha, and alpha is more than or equal to 60 degrees and less than or equal to 70 degrees.
3. The centrifugal fan blade according to claim 1, wherein one end of the outlet section (122) far away from the inlet section (121) forms an outlet end, and a plurality of outlet ends surround an outer ring; the tangent line of one outlet end and the circle of the outer circular ring is L3, the tangent line of the outlet section (122) at the outlet end is L4, the included angle between L3 and L4 is beta, and the beta is more than or equal to 150 degrees and less than or equal to 170 degrees.
4. The centrifugal fan blade according to claim 1, wherein one end of the inlet section (121) far from the outlet section (122) forms an inlet end, and a plurality of inlet ends form an inner circular ring, and the diameter of the circle in which the inner circular ring is located is D1; the outlet section (122) is an outlet end formed at one end of the outlet section (122) far away from the inlet section (121), a plurality of outlet ends surround an outer ring, and the diameter of a circle where the outer ring is located is D2; D1/D2 is more than or equal to 0.8 and less than or equal to 0.88.
5. The centrifugal fan blade according to claim 1, wherein the number of the blades (12) is Z, and Z is more than or equal to 50 and less than or equal to 60.
6. The centrifugal fan blade as claimed in claim 1, wherein one end of the inlet section (121) far away from the outlet section (122) forms an inlet end, and the distance between the inlet ends of two adjacent blades (12) is d1, and d1 is less than or equal to 11.5mm and less than or equal to 15 mm.
7. The centrifugal fan blade as claimed in claim 1, wherein an end of the outlet section (122) far away from the inlet section (121) forms an outlet end, and a distance between the outlet ends of two adjacent blades (12) is d2, and d2 mm is larger than or equal to 10mm and smaller than or equal to 13 mm.
8. The centrifugal fan blade according to claim 2, wherein one end of the outlet section (122) away from the inlet section (121) forms an outlet end, and a plurality of outlet ends surround an outer ring; a tangent line of the outlet end to a circle on which the outer ring is located is L3, a tangent line of the outlet section (122) at the outlet end is L4, and an included angle between L3 and L4 is β; wherein the content of the first and second substances,
α is 65 °; and/or the presence of a gas in the gas,
β -156 °; and/or the presence of a gas in the gas,
γ＝162°。
9. the centrifugal fan blade according to claim 5,
the number of the blades (12) is Z, and Z is 54; and/or the presence of a gas in the gas,
the distance between the inlet ends of two adjacent blades (12) is d1, and d1 is 13 mm; and/or the presence of a gas in the gas,
the distance between the outlet ends of two adjacent blades (12) is d2, and d2 is 11.5 mm.
10. A fan is characterized by comprising a centrifugal fan blade, a volute and a motor, wherein the centrifugal fan blade and the motor are both arranged in the volute, the motor is connected with the centrifugal fan blade, and the centrifugal fan blade is the centrifugal fan blade according to any one of claims 1 to 9.
11. An indoor unit of an air conditioner, characterized in that the indoor unit of the air conditioner comprises an indoor unit casing and a fan, wherein the fan is arranged in the indoor unit casing, and the fan is the fan in claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121691081.6U CN215409408U (en) | 2021-07-23 | 2021-07-23 | Centrifugal fan blade, fan and air conditioner indoor unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121691081.6U CN215409408U (en) | 2021-07-23 | 2021-07-23 | Centrifugal fan blade, fan and air conditioner indoor unit |
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| Publication Number | Publication Date |
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| CN215409408U true CN215409408U (en) | 2022-01-04 |
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| CN202121691081.6U Active CN215409408U (en) | 2021-07-23 | 2021-07-23 | Centrifugal fan blade, fan and air conditioner indoor unit |
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| Country | Link |
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