Air conditioner noise reduction fan blade and air conditioner

Abstract

The invention provides an air conditioner noise reduction fan blade and an air conditioner, and relates to the technical field of air conditioners, the air conditioner noise reduction fan blade comprises a rotating shaft and a plurality of annular belt blades, the annular belt blades are arranged on the periphery of the rotating shaft, and a first wing-shaped root and a second wing-shaped root are formed at the two ends of each annular belt blade respectively; the cross section of the first wing-shaped root is in a first wing shape, the first wing shape comprises a first side arc and a second side arc which extend from the front edge to the tail edge, the front edge end point of the first wing shape serves as the original point, the chord line serves as the X axis, and the shape of the first side arc can be limited through a formula. Therefore, the shape of the pressure face of the first wing-shaped root can be limited, it is guaranteed that the first wing-shaped root has enough acting area and installation angle, and noise can be reduced while it is guaranteed that air is discharged smoothly in the axial direction and the air volume is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and more particularly, to a noise-reducing airfoil for an air conditioner and an air conditioner. Background Art

[0002] Currently, conventional air conditioner outdoor units usually perform air exchange through axial-flow airfoils, and axial-flow airfoils usually consist of multiple axial-flow blades. During the rotation of the multiple axial-flow blades, air is conveyed along the axial direction. Due to the special structure of the air conditioner outdoor unit, axial-flow blades are usually required to have the characteristics of high air volume and low noise. However, for conventional single-piece axial-flow airfoils, the improvement of noise is limited, and it is difficult to truly achieve low noise under the conditions of high rotational speed and high air volume. Summary of the Invention

[0003] The problem solved by the present invention is how to increase the air volume while reducing the noise.

[0004] To solve the above problems, the present invention adopts the following technical solutions.

[0005] In one aspect, an embodiment of the present invention provides a noise-reducing airfoil for an air conditioner, including a rotating shaft and a plurality of annular blades. The rotating shaft has an air inlet end and an air outlet end opposite to each other in the vertical direction. The plurality of annular blades are arranged around the periphery of the rotating shaft. Each annular blade extends in a spiral shape and forms a first airfoil root and a second airfoil root at both ends. The first airfoil root is connected to the outer peripheral surface of the rotating shaft and is disposed near the air inlet end. The second airfoil root is connected to the outer peripheral surface of the rotating shaft and is disposed near the air outlet end. The cross-section of the first airfoil root is in the shape of a first airfoil. The first airfoil includes a first side arc and a second side arc. Both the first side arc and the second side arc extend from the leading edge endpoint to the trailing edge endpoint of the first airfoil. And the first side arc is joined to the pressure surface of the first airfoil root, and the second side arc is joined to the suction surface of the first airfoil root. Taking the leading edge endpoint of the first airfoil as the origin and the chord line of the first airfoil as the X-axis, the first side arc satisfies the following formula:

[0006] y = (-2E-08)x 5 +(5E-06)x 4 -0.0004x 3 +0.0077x 2 +0.2221x - 1.8176.

[0007] The air-conditioning noise-reducing wind blade provided by the embodiment of the present invention is provided with a plurality of annular blades on the periphery of the rotating shaft. Both ends of each annular blade respectively form a first airfoil root and a second airfoil root, and are connected to the rotating shaft through the first airfoil root and the second airfoil root. The cross-section of the first airfoil root is in the shape of a first airfoil. The first airfoil includes a first side arc and a second side arc respectively extending from the leading edge to the trailing edge. Taking the leading edge end point of the first airfoil as the origin and the chord line as the X-axis, the shape of the first side arc can be defined by a formula, so that the shape of the pressure surface of the first airfoil root can be defined, ensuring that the first airfoil root has sufficient working area and installation angle. While ensuring smooth axial air outlet and increasing the air volume, the noise can be reduced.

[0008] Further, the second side arc satisfies the following formula:

[0009] y = (9E-09)x 5 -(3E-06)x 4 +0.0003x 3 -0.0241x 2 +0.9028x + 2.6439.

[0010] The air-conditioning noise-reducing wind blade provided by the embodiment of the present invention can define the shape of the second side arc through a formula, so that the shape of the suction surface of the first airfoil root can be defined, ensuring that the suction surface of the first airfoil root can realize smooth flow of the air flow, further ensuring smooth axial air outlet, avoiding the occurrence of turbulent flow, and being able to further reduce the noise.

[0011] Further, one end of the first side arc close to the leading edge end point of the first airfoil is smoothly connected to one end of the second side arc close to the leading edge end point of the first airfoil through a first inverted circular arc, and one end of the first side arc close to the trailing edge end point of the first airfoil is connected to one end of the second side arc close to the trailing edge end point of the first airfoil.

[0012] The air-conditioning noise-reducing wind blade provided by the embodiment of the present invention can ensure smooth transition at the leading edge of the first airfoil by providing a first inverted circular arc at the leading edge of the first airfoil, so that the leading edge of the first airfoil root is more rounded, which is beneficial to the smooth diversion of the air flow to the surface of the first airfoil root. And the other end of the first side arc and the other end of the second side arc are directly connected, which can make the trailing edge angle of the first airfoil root smaller, effectively avoiding the formation of turbulence at the trailing wake, and ensuring the smooth flow of the air flow.

[0013] Further, the first side arc bulges towards the direction close to the second side arc, so that the pressure surface of the first airfoil root is in a concave arc surface;

[0014] The second side arc bulges towards the direction away from the first side arc, so that the suction surface of the first airfoil root is in a convex arc surface.

[0015] The air-conditioning noise-reducing wind blade provided by the embodiment of the present invention can limit the convex direction of the first airfoil by setting the convex directions of the first side arc and the second side arc. The pressure surface at the root of the first airfoil is set as an inward concave arc surface, which is beneficial to converging air flow and doing work, while the suction surface at the root of the first airfoil is set as an outward convex arc surface, which is beneficial to the smooth flow of air, can ensure its air supply effect, and the cross-section of the root of the first airfoil is in an arc-shaped airfoil, which can further ensure the air volume and noise reduction effect.

[0016] Further, the cross-section of the root of the second airfoil is in the shape of a second airfoil. The second airfoil includes a third side arc and a fourth side arc. Both the third side arc and the fourth side arc extend from the leading edge end point to the trailing edge end point of the second airfoil, and the third side arc is joined to the pressure surface of the root of the second airfoil, and the fourth side arc is joined to the suction surface of the root of the second airfoil.

[0017] The air-conditioning noise-reducing wind blade provided by the embodiment of the present invention can ensure the air supply volume and noise reduction effect of the root of the second airfoil by setting the root of the second airfoil to also be in an airfoil structure and surrounded by the third side arc and the fourth side arc.

[0018] Further, taking the leading edge end point of the second airfoil as the origin and the chord line of the second airfoil as the X-axis, the third side arc satisfies the following formula:

[0019] y = (-2E-08)x 5 +(5E-06)x 4 -0.0004x 3 +0.0064x 2 +0.2271x - 2.1458.

[0020] The air-conditioning noise-reducing wind blade provided by the embodiment of the present invention can limit the shape of the third side arc through the formula, so as to limit the shape of the pressure surface of the root of the second airfoil, ensure that the root of the second airfoil has sufficient working area and installation angle, and can reduce noise while ensuring smooth axial air outlet and increasing the air volume.

[0021] Further, the fourth side arc satisfies the following formula:

[0022] y = (2E-08)x 5 -(5E-06)x 4 +0.0005x 3 -0.0321x 2 +0.9965x + 2.074.

[0023] The air-conditioning noise-reducing airfoil provided by the embodiment of the present invention can define the shape of the fourth side arc through a formula, so as to define the shape of the suction surface of the root of the second airfoil, ensure the smooth flow of air flow on the suction surface of the root of the second airfoil, further ensure the smooth axial air outlet, avoid the occurrence of turbulent flow, and further reduce noise.

[0024] Further, one end of the third side arc close to the leading edge end point of the second airfoil is smoothly connected to one end of the fourth side arc close to the leading edge end point of the second airfoil through a second inverted circular arc, and one end of the third side arc close to the trailing edge end point of the second airfoil is connected to one end of the fourth side arc close to the trailing edge end point of the second airfoil.

[0025] The air-conditioning noise-reducing airfoil provided by the embodiment of the present invention can ensure smooth transition at the leading edge of the second airfoil by setting a second inverted circular arc at the leading edge of the second airfoil, so that the leading edge of the root of the second airfoil is more rounded, which is beneficial to the smooth diversion of air flow to the surface of the root of the second airfoil. Moreover, the other ends of the third side arc and the fourth side arc are directly connected, which can make the trailing edge angle of the root of the second airfoil smaller, effectively avoid the formation of turbulence at the trailing wake, and ensure the smooth flow of air flow.

[0026] Further, the third side arc protrudes towards the direction close to the fourth side arc, so that the pressure surface of the root of the second airfoil is an inward concave arc surface;

[0027] The fourth side arc protrudes towards the direction away from the third side arc, so that the suction surface of the root of the second airfoil is an outward convex arc surface.

[0028] The air-conditioning noise-reducing airfoil provided by the embodiment of the present invention can limit the protruding direction of the second airfoil by setting the protruding directions of the third side arc and the fourth side arc. Setting the pressure surface of the root of the second airfoil as an inward concave arc surface is beneficial to converging air flow and doing work, while setting the suction surface of the root of the second airfoil as an outward convex arc surface is beneficial to the smooth flow of air flow, which can ensure its air supply effect. Moreover, the cross-section of the root of the second airfoil is an arc-shaped airfoil, which can further ensure the air volume and sound insulation effect.

[0029] An air conditioner includes an air-conditioning body and the aforementioned air-conditioning noise-reducing airfoil. A motor is installed in the air-conditioning body, and the motor is in transmission connection with the rotating shaft. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the air-conditioning noise-reducing airfoil provided by the first embodiment of the present invention from the first perspective;

[0031] Figure 2 It is a schematic structural diagram of the air-conditioning noise-reducing airfoil provided by the first embodiment of the present invention from the second perspective;

[0032] Figure 3 Schematic diagram of the structure of the air conditioner noise reduction impeller provided by the first embodiment of the present invention from the third perspective;

[0033] Figure 4 is Figure 1 Schematic diagram of the connection structure between the first airfoil root and the rotating shaft in

[0034] Figure 5 is Figure 1 Schematic diagram of the connection structure between the second airfoil root and the rotating shaft in

[0035] Explanation of reference numerals:

[0036] 100 - air conditioner noise reduction impeller; 110 - rotating shaft; 111 - air inlet end; 113 - air outlet end; 130 - annular blade; 131 - air guiding channel; 150 - first airfoil root; 151 - first airfoil; 153 - first side arc; 155 - second side arc; 157 - first inverted circular arc; 170 - second airfoil root; 171 - second airfoil; 173 - third side arc; 175 - fourth side arc; 177 - second inverted circular arc. Detailed implementation manners

[0037] In order to make the above - mentioned objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings.

[0038] First embodiment

[0039] Refer to Figures 1 to 5 , this embodiment provides an air conditioner noise reduction impeller 100, which can reduce noise while increasing the air volume by limiting the shape of the root, thereby improving the user experience of the whole machine.

[0040] The air-conditioning noise-reducing airfoil 100 provided in this embodiment includes a rotating shaft 110 and a plurality of annular blades 130. The rotating shaft 110 has an air inlet end 111 and an air outlet end 113 that are opposite to each other in the vertical direction. The plurality of annular blades 130 are arranged around the periphery of the rotating shaft 110. Each annular blade 130 extends in a spiral shape and forms a first airfoil root 150 and a second airfoil root 170 at both ends. The first airfoil root 150 is connected to the outer peripheral surface of the rotating shaft 110 and is disposed near the air inlet end 111. The second airfoil root 170 is connected to the outer peripheral surface of the rotating shaft 110 and is disposed near the air outlet end 113. The cross-section of the first airfoil root 150 is a first airfoil 151. The first airfoil 151 includes a first side arc 153 and a second side arc 155. Both the first side arc 153 and the second side arc 155 extend from the leading edge end point of the first airfoil 151 to the trailing edge end point, and the first side arc 153 is joined to the pressure surface of the first airfoil root 150, and the second side arc 155 is joined to the suction surface of the first airfoil root 150. Taking the leading edge end point of the first airfoil 151 as the origin O1 and the chord line X1 of the first airfoil 151 as the X-axis, the first side arc 153 satisfies the following first formula:

[0041] y = (-2E-08)x 5 +(5E-06)x 4 -0.0004x 3 +0.0077x 2 +0.2221x - 1.8176.

[0042] In this embodiment, the air-conditioning noise-reducing airfoil 100 is applicable to an air conditioner. The air conditioner may be an outdoor unit of the air conditioner, and a motor is installed inside the outdoor unit of the air conditioner. The motor is in transmission connection with the rotating shaft 110, so as to drive the plurality of annular blades 130 to rotate through the rotating shaft 110, thereby realizing air supply.

[0043] It should be noted that the annular blade 130 extends in a spiral shape in this embodiment, which means that the annular blade 130 extends radially outward from the first airfoil root 150 and is spirally folded. After reaching the distal end, it is folded back and finally extends to the second airfoil root 170. Preferably, the annular blade 130 in this embodiment can extend from the first airfoil root 150 and be spirally folded by 160°-190° and then folded back to the second airfoil root 170, and the annular blade 130 and the rotating shaft 110 enclose a wind guiding channel 131. The wind guiding channel 131 can supply air flow during the rotation of the annular blade 130.

[0044] It should be noted that in this embodiment, the chord line X1 of the first airfoil 151 refers to the straight line segment connecting the leading edge endpoint and the trailing edge endpoint of the first airfoil 151, that is, connecting from the midpoint of the leading edge of the first airfoil 151 to the midpoint of the trailing edge of the first airfoil 151, and the chord line is a straight line segment. In addition, the leading edge endpoint of the first airfoil 151 refers to the endpoint on the leading edge of the first airfoil 151 that is farthest from the center of the first airfoil 151, that is, at the midpoint of the leading edge of the first airfoil 151, while the trailing edge endpoint of the first airfoil 151 refers to the endpoint on the trailing edge of the first airfoil 151 that is farthest from the center of the first airfoil 151, that is, at the midpoint of the trailing edge of the first airfoil 151.

[0045] The air-conditioning noise-reducing fan blade 100 provided in this embodiment is provided with a plurality of annular blades 130 on the periphery of the rotating shaft 110. Both ends of each annular blade 130 respectively form a first airfoil root 150 and a second airfoil root 170, and are connected to the rotating shaft 110 through the first airfoil root 150 and the second airfoil root 170. The cross-section of the first airfoil root 150 is in the shape of a first airfoil 151. The first airfoil 151 includes a first side arc 153 and a second side arc 155 respectively extending from the leading edge to the trailing edge. Taking the leading edge endpoint of the first airfoil 151 as the origin and the chord line as the X-axis, the shape of the first side arc 153 can be defined by the first formula, so that the shape of the pressure surface of the first airfoil root 150 can be defined, ensuring that the first airfoil root 150 has sufficient working area and installation angle. While ensuring smooth axial air outlet and increasing the air volume, the noise can be reduced.

[0046] Furthermore, taking the leading edge endpoint of the first airfoil 151 as the origin O1 and the chord line X1 of the first airfoil 151 as the X-axis, the second side arc 155 satisfies the following second formula:

[0047] y=(9E - 09)x 5 -(3E - 06)x 4 +0.0003x 3 -0.0241x 2 +0.9028x + 2.6439.

[0048] Specifically, the shape of the second side arc 155 can be defined by the second formula, so that the shape of the suction surface of the first airfoil root 150 can be defined, ensuring that the suction surface of the first airfoil root 150 can achieve smooth air flow, further ensuring smooth axial air outlet, avoiding the occurrence of turbulent flow, and being able to further reduce the noise.

[0049] In this embodiment, one end of the first side arc 153 close to the leading edge end point of the first airfoil 151 is smoothly connected to one end of the second side arc 155 close to the leading edge end point of the first airfoil 151 through a first fillet arc 157, and one end of the first side arc 153 close to the trailing edge end point of the first airfoil 151 is connected to one end of the second side arc 155 close to the trailing edge end point of the first airfoil 151. Specifically, both the first side arc 153 and the second side arc 155 are connected to the first fillet arc 157, and the first fillet arc 157 forms the leading edge of the first airfoil 151, and the leading edge end point of the first airfoil 151 is located at the midpoint of the first fillet arc 157. By providing the first fillet arc 157 at the leading edge of the first airfoil 151, a smooth transition at the leading edge of the first airfoil 151 can be ensured, so that the leading edge of the first airfoil root 150 is more rounded, which is beneficial to the smooth diversion of the airflow to the surface of the first airfoil root 150. Moreover, the other ends of the first side arc 153 and the second side arc 155 are directly connected, which can make the trailing edge angle of the first airfoil root 150 smaller, effectively avoid the formation of turbulence at the wake, and ensure the smooth flow of the airflow.

[0050] In this embodiment, the first side arc 153 bulges towards the direction close to the second side arc 155, so that the pressure surface of the first airfoil root 150 is a concave arc surface; at the same time, the second side arc 155 bulges towards the direction away from the first side arc 153, so that the suction surface of the first airfoil root 150 is a convex arc surface. By setting the bulging directions of the first side arc 153 and the second side arc 155, the bulging direction of the first airfoil 151 can be limited. Setting the pressure surface of the first airfoil root 150 as a concave arc surface is beneficial to converging the airflow and doing work, while setting the suction surface of the first airfoil root 150 as a convex arc surface is beneficial to the smooth flow of the airflow, which can ensure its air supply effect. Moreover, the cross-section of the first airfoil root 150 is an arc-shaped airfoil, which can further ensure the air volume and the sound insulation effect.

[0051] In this embodiment, the cross-section of the second airfoil root 170 is a second airfoil 171. The second airfoil 171 includes a third side arc 173 and a fourth side arc 175. Both the third side arc 173 and the fourth side arc 175 extend from the leading edge end point of the second airfoil 171 to the trailing edge end point, and the third side arc 173 is joined to the pressure surface of the second airfoil root 170, and the fourth side arc 175 is joined to the suction surface of the second airfoil root 170. Specifically, the cross-section of the second airfoil root 170 is also an airfoil shape, and its basic structure is similar to that of the first airfoil root 150. By setting the second airfoil root 170 as an airfoil structure as well, and the second airfoil 171 is formed by enclosing the third side arc 173 and the fourth side arc 175, the air supply volume and the sound insulation effect of the second airfoil root 170 can be ensured.

[0052] Further, taking the leading edge endpoint of the second airfoil 171 as the origin O2 and the chord line X2 of the second airfoil 171 as the X-axis, the third side arc 173 satisfies the following third formula:

[0053] y = (-2E - 08)x 5 +(5E - 06)x 4 -0.0004x 3 +0.0064x 2 +0.2271x - 2.1458.

[0054] Specifically, in this embodiment, the third formula can define the shape of the third side arc 173, thereby defining the shape of the pressure surface of the second airfoil root 170, ensuring that the second airfoil root 170 has sufficient working area and installation angle, while ensuring smooth axial air outlet and increasing the air volume, and reducing noise at the same time.

[0055] It should be noted that the chord line X2 of the second airfoil 171 in this embodiment refers to the straight line segment connecting the leading edge endpoint and the trailing edge endpoint of the second airfoil 171, that is, connecting from the midpoint of the leading edge of the second airfoil 171 to the midpoint of the trailing edge of the second airfoil 171, and the chord line is a straight line segment. In addition, the leading edge endpoint of the second airfoil 171 refers to the endpoint on the leading edge of the second airfoil 171 that is farthest from the center of the second airfoil 171, that is, at the midpoint of the leading edge of the second airfoil 171, while the trailing edge endpoint of the second airfoil 171 refers to the endpoint on the trailing edge of the second airfoil 171 that is farthest from the center of the first airfoil 151, that is, at the midpoint of the trailing edge of the second airfoil 171.

[0056] Further, taking the leading edge endpoint of the second airfoil 171 as the origin O2 and the chord line of the second airfoil 171 as the X-axis, the fourth side arc 175 satisfies the following fourth formula:

[0057] y = (2E - 08)x 5 -(5E - 06)x 4 +0.0005x 3 -0.0321x 2 +0.9965x + 2.074.

[0058] The air-conditioning noise-reducing airfoil 100 provided by the embodiment of the present invention can define the shape of the fourth side arc 175 through the fourth formula, thereby defining the shape of the suction surface of the second airfoil root 170, ensuring smooth air flow on the suction surface of the second airfoil root 170, further ensuring smooth axial air outlet, avoiding turbulent flow, and further reducing noise.

[0059] In this embodiment, one end of the third side arc 173 close to the leading edge end point of the second airfoil 171 and one end of the fourth side arc 175 close to the leading edge end point of the second airfoil 171 are smoothly connected through the second inverted circular arc 177, and one end of the third side arc 173 close to the trailing edge end point of the second airfoil 171 is connected to one end of the fourth side arc 175 close to the trailing edge end point of the second airfoil 171. Specifically, both the third side arc 173 and the fourth side arc 175 are connected to the second inverted circular arc 177, and the second inverted circular arc 177 forms the leading edge of the second airfoil 171, and the leading edge end point of the second airfoil 171 is located at the midpoint of the second inverted circular arc 177. By providing the second inverted circular arc 177 at the leading edge of the second airfoil 171, smooth transition at the leading edge of the second airfoil 171 can be ensured, so that the leading edge of the second airfoil root 170 is more rounded, which is conducive to the smooth diversion of the air flow to the surface of the second airfoil root 170. Moreover, the other ends of the third side arc 173 and the fourth side arc 175 are directly connected, which can make the trailing edge angle of the second airfoil root 170 smaller, effectively avoid the formation of turbulence at the wake, and ensure the smooth flow of the air flow.

[0060] In this embodiment, the third side arc 173 bulges towards the direction close to the fourth side arc 175, so that the pressure surface of the second airfoil root 170 is a concave arc surface; and the fourth side arc 175 bulges towards the direction away from the third side arc 173, so that the suction surface of the second airfoil root 170 is a convex arc surface. By setting the bulging directions of the third side arc 173 and the fourth side arc 175, the bulging direction of the second airfoil 171 can be limited. Setting the pressure surface of the second airfoil root 170 as a concave arc surface is conducive to converging the air flow and doing work, while setting the suction surface of the second airfoil root 170 as a convex arc surface is conducive to the smooth flow of the air flow, which can ensure its air supply effect. Moreover, the cross-section of the second airfoil root 170 is an arc-shaped airfoil, which can further ensure the air volume and the sound insulation effect.

[0061] In summary, this embodiment provides an air-conditioning noise-reducing airfoil 100. A plurality of annular blades 130 are arranged on the periphery of a rotating shaft 110. Both ends of each annular blade 130 respectively form a first airfoil root 150 and a second airfoil root 170, and are connected to the rotating shaft 110 through the first airfoil root 150 and the second airfoil root 170. The cross-section of the first airfoil root 150 is in the shape of a first airfoil 151. The first airfoil 151 includes a first arc 153 and a second arc 155 respectively extending from the leading edge to the trailing edge. Taking the leading-edge endpoint of the first airfoil 151 as the origin and the chord line as the X-axis, the first arc 153 and the second arc 155 can be defined by a formula. At the same time, the second airfoil 171 includes a third arc 173 and a fourth arc respectively extending from the leading edge to the trailing edge. The shapes of the third arc 173 and the second arc 155 can be defined by a formula, so that the shapes of the first airfoil root 150 and the second airfoil root 170 can be defined, ensuring that the first airfoil root 150 and the second airfoil root 170 have sufficient working areas and installation angles. While ensuring smooth axial air output and increasing the air volume, the noise can be reduced.

[0062] Second Embodiment

[0063] This embodiment provides an air conditioner, including an air-conditioning body and an air-conditioning noise-reducing airfoil 100. The basic structure, principle, and technical effects generated by the air-conditioning noise-reducing airfoil 100 are the same as those of the first embodiment. For a brief description, for the parts not mentioned in this embodiment, reference can be made to the corresponding content in the first embodiment.

[0064] In this embodiment, the air conditioner includes an air-conditioning body and an air-conditioning noise-reducing airfoil 100. The air-conditioning noise-reducing airfoil 100 includes a rotating shaft 110 and a plurality of annular blades 130. The rotating shaft 110 has an air inlet end 111 and an air outlet end 113 opposite to each other in the vertical direction. The plurality of annular blades 130 are arranged around the periphery of the rotating shaft 110. Each annular blade 130 extends spirally and forms a first airfoil root 150 and a second airfoil root 170 at both ends. The first airfoil root 150 is connected to the outer peripheral surface of the rotating shaft 110 and is arranged near the air inlet end 111. The second airfoil root 170 is connected to the outer peripheral surface of the rotating shaft 110 and is arranged near the air outlet end 113. The cross-section of the first airfoil root 150 is in the shape of a first airfoil 151. The first airfoil 151 includes a first arc 153 and a second arc 155. Both the first arc 153 and the second arc 155 extend from the leading-edge endpoint to the trailing-edge endpoint of the first airfoil 151. And the first arc 153 is joined to the pressure surface of the first airfoil root 150, and the second arc 155 is joined to the suction surface of the first airfoil root 150. Taking the leading-edge endpoint of the first airfoil 151 as the origin and the chord line of the first airfoil 151 as the X-axis, the first arc 153 satisfies the following first formula:

[0065] y = (-2E-08)x 5 +(5E-06)x4 -0.0004x 3 +0.0077x 2 +0.2221x - 1.8176。

[0066] Among them, a motor is installed inside the air conditioner body, and the motor is drivingly connected to the rotating shaft 110.

[0067] In this embodiment, the air conditioner may be an outdoor unit of the air conditioner. The motor inside the outdoor unit of the air conditioner can drive the rotating shaft 110 to rotate, and then drive the annular blade 130 to rotate, realizing axial air outlet.

[0068] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. An air conditioner noise-reducing fan blade, characterized in that, It includes a rotating shaft (110) and a plurality of annular blades (130). The rotating shaft (110) has an air inlet end (111) and an air outlet end (113) that are opposite to each other in the vertical direction. The plurality of annular blades (130) are arranged around the periphery of the rotating shaft (110). Each annular blade (130) extends in a spiral shape and forms a first airfoil root (150) and a second airfoil root (170) at both ends. The first airfoil root (150) is connected to the outer peripheral surface of the rotating shaft (110) and is arranged near the air inlet end (111). The second airfoil root (170) is connected to the outer peripheral surface of the rotating shaft (110) and is arranged near the air outlet end (113). The cross-section of the first airfoil root (150) is a first airfoil (151). The first airfoil (151) includes a first side arc (153) and a second side arc (155). Both the first side arc (153) and the second side arc (155) extend from the leading edge end point of the first airfoil (151) to the trailing edge end point. And the first side arc (153) is joined to the pressure surface of the first airfoil root (150), and the second side arc (155) is joined to the suction surface of the first airfoil root (150). Taking the leading edge end point of the first airfoil (151) as the origin and the chord line of the first airfoil (151) as the X-axis, the first side arc (153) satisfies the following formula: y = (-2E-08)x 5 +(5E-06)x 4 -0.0004x 3 +0.0077x 2 +0.2221x - 1.8176。 2. The air-conditioning noise-reducing wind blade according to claim 1, wherein The second side arc (155) satisfies the following formula: y = (9E - 09)x 5 -(3E - 06)x 4 +0.0003x 3 -0.0241x 2 +0.9028x + 2.6439。 3. The air-conditioning noise-reducing wind blade according to claim 1, wherein One end of the first side arc (153) close to the leading edge end point of the first airfoil (151) is smoothly connected to one end of the second side arc (155) close to the leading edge end point of the first airfoil (151) through a first fillet arc (157). One end of the first side arc (153) close to the trailing edge end point of the first airfoil (151) is connected to one end of the second side arc (155) close to the trailing edge end point of the first airfoil (151).

4. The air-conditioning noise-reducing wind blade according to claim 1, characterized in that, The first side arc (153) bulges towards the direction close to the second side arc (155), so that the pressure surface of the first airfoil root (150) is a concave arc surface; The second side arc (155) bulges towards the direction away from the first side arc (153), so that the suction surface of the first airfoil root (150) is a convex arc surface.

5. The air-conditioning noise-reducing wind blade according to claim 1, characterized in that, The cross-section of the second airfoil root (170) is a second airfoil (171). The second airfoil (171) includes a third side arc (173) and a fourth side arc (175). Both the third side arc (173) and the fourth side arc (175) extend from the leading edge end point of the second airfoil (171) to the trailing edge end point. And the third side arc (173) is joined to the pressure surface of the second airfoil root (170), and the fourth side arc (175) is joined to the suction surface of the second airfoil root (170).

6. The air conditioner noise reduction airfoil according to claim 5, characterized in that, Taking the leading edge end point of the second airfoil (171) as the origin and the chord line of the second airfoil (171) as the X-axis, the third side arc (173) satisfies the following formula: y = (-2E-08)x 5 +(5E-06)x 4 -0.0004x 3 +0.0064x 2 +0.2271x - 2.1458。 7. The air conditioner noise-reducing airfoil according to claim 6, characterized in that, The fourth side arc (175) satisfies the following formula: y = (2E-08)x 5 -(5E-06)x 4 +0.0005x 3 -0.0321x 2 +0.9965x + 2.074。 8. The air conditioner noise reduction airfoil according to claim 5, characterized in that, One end of the third side arc (173) close to the leading edge end point of the second airfoil (171) and one end of the fourth side arc (175) close to the leading edge end point of the second airfoil (171) are smoothly connected through a second reverse circular arc (177), and one end of the third side arc (173) close to the trailing edge end point of the second airfoil (171) is connected to one end of the fourth side arc (175) close to the trailing edge end point of the second airfoil (171).

9. The air conditioner noise-reducing fan blade according to claim 5, characterized in that, The third side arc (173) bulges towards the direction close to the fourth side arc (175) so that the pressure surface of the root part of the second airfoil (170) is a concave arc surface; The fourth side arc (175) bulges towards the direction away from the third side arc (173) so that the suction surface of the root part of the second airfoil (170) is a convex arc surface.

10. An air conditioner, characterized in that, It includes an air conditioner body and an air conditioner noise reduction airfoil as described in any one of claims 1-9, a motor is installed in the air conditioner body, and the motor is in transmission connection with the rotating shaft (110).

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