CN217481615U - Axial flow fan blade and air conditioner - Google Patents

Abstract

The utility model discloses an axial flow fan blade and air conditioner relates to air conditioner technical field. The axial flow fan blade comprises a hub and blades. The blade is oppositely provided with an inner edge and an outer edge, the inner edge is fixedly connected with the hub, the outer edge is provided with a silencing groove, and the silencing groove is used for eliminating blade tip vortex generated between the outer edge and the flow guide ring when the axial flow fan blade rotates. Compared with the prior art, the utility model provides an axial fan blade is owing to adopted the inner edge with wheel hub fixed connection and seted up the amortization groove in the outer edge, so can effectively eliminate the apex vortex that produces between axial fan blade and the water conservancy diversion circle, reach the mesh that the amortization was fallen and is made an uproar, and noise reduction effect is good, and user experience is good.

Description

Axial flow fan blade and air conditioner

Technical Field

The utility model relates to an air conditioner technical field, in particular to axial flow fan blade and air conditioner.

Background

At present, in the application of an air conditioner outdoor unit, an axial flow fan is generally adopted to drive air to flow so as to accelerate the heat exchange of a condenser and quickly discharge the heat of the condenser to the outside. The existing axial flow fan has the problem of large noise, and the tip vortex noise generated between the axial flow fan blade and the flow guide ring is one of the main noise sources, so when the noise is mixed with other high-frequency noise, the noise generated when the air conditioner external unit operates is multiplied, and the user experience is seriously influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem how effectively eliminate the apex vortex that produces between axial fan blade and the water conservancy diversion circle, reach the purpose that the amortization was fallen and is made an uproar, noise reduction effect is good, and user experience is good.

In order to solve the above problem, the technical scheme of the utility model is realized like this:

in a first aspect, the utility model provides an axial fan blade for rotationally set up in the water conservancy diversion circle, axial fan blade includes wheel hub and blade, and the blade is provided with inner edge and outer fringe relatively, inner edge and wheel hub fixed connection, and the amortization groove has been seted up to the outer fringe, and the amortization groove is used for eliminating the apex vortex that produces between outer fringe and the water conservancy diversion circle when axial fan blade rotates. Compared with the prior art, the utility model provides an axial fan blade is owing to adopted with wheel hub fixed connection's inner edge and seted up in the amortization groove of outer fringe, so can effectively eliminate the apex vortex that produces between axial fan blade and the water conservancy diversion circle, reach the mesh that the amortization was fallen and is fallen and make an uproar, and noise reduction effect is good, and user experience is good.

Furthermore, the silencing groove comprises a first side wall and a second side wall which are arranged oppositely, the first side wall and the second side wall are sequentially arranged along the air outlet direction of the axial flow fan blade, an air inlet hole is formed in the first side wall, an air outlet hole is formed in the second side wall, and the air inlet hole and the air outlet hole are communicated with the silencing groove. Air can enter the silencing groove from the air inlet hole, and the air in the silencing groove can be discharged outwards from the air outlet hole.

Furthermore, the air inlet hole and the air outlet hole are oppositely arranged on two sides of the silencing groove, and the air inlet hole and the air outlet hole are sequentially arranged along the rotation direction of the axial flow fan blade. In the process that the driving motor drives the axial flow fan blade to rotate, air can be ensured to enter the silencing groove through the air inlet hole and then be discharged out of the silencing groove through the exhaust hole or a gap between the outer edge and the flow guide ring.

Furthermore, the opening direction of the air inlet hole is inclined to the first side wall, so that the resistance of air entering the air inlet hole is reduced, the air can be ensured to smoothly enter the air inlet hole in the rotating process of the axial flow fan blade, and the air inlet efficiency and the air inlet amount are improved. The exhaust holes are formed in the direction inclined to the second side wall so as to reduce resistance of air exhausted out of the exhaust holes, ensure that air can be smoothly exhausted out of the exhaust holes in the rotating process of the axial flow fan blade, and improve exhaust efficiency and exhaust amount.

Furthermore, the number of the air inlets is multiple, the multiple air inlets are arranged on the first side wall in a rectangular array, and the multiple air inlets jointly act to further improve air inlet efficiency and air inlet amount and ensure that air entering the silencing groove is enough to disturb formation of vortex of the blade tip; the quantity in exhaust hole is a plurality of, and a plurality of exhaust holes are the rectangle array and set up on the second lateral wall to further improve exhaust efficiency and displacement, avoid exhausting untimely the condition that leads to the air current disorder to take place.

Furthermore, a preset included angle is formed between the first side wall and the second side wall, and the range of the preset included angle is 30-45 degrees. The reasonable included angle of presetting can guarantee that the air mass flow that gets into the amortization groove can disturb the formation of apex vortex, and noise reduction is effectual.

Further, the maximum spacing between the first and second sidewalls ranges from 15 millimeters to 18 millimeters. The reasonable maximum spacing between the first side wall and the second side wall ensures that the air flow discharged from the gap between the outer edge and the flow guide ring is enough to disturb the formation of the tip vortex.

Further, the depth of the sound-deadening groove in the radial direction of the hub ranges from 18 mm to 20 mm. The reasonable depth of the silencing groove in the radial direction of the hub can further ensure that the air flow entering the silencing groove can disturb the formation of tip vortex.

Further, the ratio of the chord length of the outer edge to the chord length at the opening of the silencing slot ranges from 1.2 to 1.5. The reasonable ratio of the chord length of the outer edge to the chord length of the opening of the silencing groove can ensure that the vortex of the blade tip is eliminated and simultaneously the influence on the air outlet effect of the axial flow fan is reduced as much as possible.

Further, wheel hub includes a fixed section of thick bamboo, spliced pole and strengthening rib, and the spliced pole sets up in a fixed section of thick bamboo, and through the inner wall fixed connection of strengthening rib with a fixed section of thick bamboo, the spliced pole be used for with driving motor's output shaft, inner edge fixed connection is in the outer wall of a fixed section of thick bamboo. The strengthening rib is used for improving the joint strength of spliced pole and fixed section of thick bamboo to prevent that fixed section of thick bamboo from taking place to warp at the rotation in-process, improving wheel hub pivoted stability.

Furthermore, the number of the reinforcing ribs is multiple, and the plurality of the reinforcing ribs are arranged outside the connecting column in an annular array. A plurality of strengthening ribs combined action to further improve the joint strength of spliced pole and fixed section of thick bamboo, prevent that fixed section of thick bamboo from taking place to warp.

A second aspect, the utility model provides an air conditioner, including foretell axial fan blade, this axial fan blade is used for rotationally setting up in the water conservancy diversion circle, and the axial fan blade includes wheel hub and blade, and the blade is provided with inner edge and outer fringe relatively, inner edge and wheel hub fixed connection, and the amortization groove has been seted up to the outer fringe, and the amortization groove is used for eliminating the apex vortex that produces between outer fringe and the water conservancy diversion circle when the axial fan blade rotates. The air conditioner can effectively eliminate the blade tip vortex generated between the axial flow fan blade and the flow guide ring, achieves the purposes of noise reduction and noise reduction, and is good in noise reduction effect and good in user experience.

Drawings

Fig. 1 is a schematic structural view of an axial-flow fan blade disposed in a flow guiding ring according to a first embodiment of the present invention;

fig. 2 is a schematic structural view of an angle of view of an axial-flow fan blade according to a first embodiment of the present invention;

fig. 3 is a schematic structural view of another view angle of the axial-flow fan blade according to the first embodiment of the present invention;

FIG. 4 is a schematic structural view of a blade in an axial flow fan according to a first embodiment of the present invention;

FIG. 5 is a mathematical model of a first perspective of a blade in an axial flow fan according to a first embodiment of the present invention;

FIG. 6 is a mathematical model of a second perspective of blades in an axial flow fan according to a first embodiment of the present invention;

fig. 7 is a mathematical model diagram of a third view angle of the blade in the axial-flow fan according to the first embodiment of the present invention.

Description of the reference numerals:

100-axial flow fan blades; 110-a hub; 111-a stationary cartridge; 112-connecting column; 113-reinforcing ribs; 120-blades; 121-leading edge; 122-trailing edge; 123-inner edge; 124-outer edge; 125-silencing groove; 126-a first side wall; 127-a bottom wall; 128-a second sidewall; 129-air intake; 130-vent hole; 200-a guide ring.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

First embodiment

Referring to fig. 1, an embodiment of the present invention provides an axial-flow fan blade 100 for driving air to flow. The blade tip vortex generated between the axial flow fan blade 100 and the guide ring 200 can be effectively eliminated, the purposes of noise reduction and noise reduction are achieved, the noise reduction effect is good, and the user experience is good.

It should be noted that the axial flow fan 100 is applied to an air conditioner external unit (not shown), the air conditioner external unit is installed outdoors and connected to an air conditioner internal unit (not shown), and the air conditioner external unit and the air conditioner internal unit work together to achieve the function of regulating and controlling the indoor air temperature. The outdoor unit of the air conditioner includes a condenser (not shown), an axial flow fan (not shown), and a casing (not shown), wherein the condenser and the axial flow fan are installed in the casing, and the casing is used for shielding and protecting the condenser and the axial flow fan.

Specifically, the axial flow fan includes a driving motor (not shown), axial flow fan blades 100, and a flow guiding ring 200. The driving motor is in transmission connection with the axial flow fan blades 100 to drive the axial flow fan blades 100 to rotate, the axial flow fan blades 100 correspond to the condenser, the condenser is used for exchanging heat with a refrigerant, the axial flow fan blades 100 can form negative pressure in the rotating process to drive air to flow to form air outlet airflow, and the air outlet airflow is used for cooling the condenser to take away heat of the condenser and ensure normal operation of the condenser. Further, the axial flow fan blades 100 are rotatably disposed in the flow guide ring 200, and the flow guide ring 200 is used for guiding the flow of the outlet air to ensure that the outlet air is stably blown to the condenser.

The axial flow fan blade 100 includes a hub 110 and blades 120. Hub 110 is cylindric, and hub 110 and blade 120 fixed connection, and blade 120 sets up on hub 110 global, and hub 110 can drive blade 120 and rotate to drive the air flow. Hub 110 is used for being connected with the driving motor transmission, and driving motor can drive blade 120 through hub 110 and rotate.

In this embodiment, the number of the blades 120 is three, the three blades 120 are disposed on the circumferential surface of the hub 110 in an annular array, and the hub 110 can drive the three blades 120 to rotate at the same time, so that the air flows to form the outlet airflow. However, the number of the blades 120 is not limited to four, and in other embodiments, the number of the blades 120 may be four or five, and the number of the blades 120 is not particularly limited.

Referring to fig. 2, fig. 3 and fig. 4, it should be noted that the blade 120 is provided with a leading edge 121, a trailing edge 122, an inner edge 123 and an outer edge 124, wherein the leading edge 121 and the trailing edge 122 are disposed opposite to each other, the inner edge 123 and the outer edge 124 are disposed opposite to each other, and the leading edge 121, the outer edge 124, the trailing edge 122 and the inner edge 123 are connected end to jointly enclose the contour shape of the blade 120. Specifically, the inner edge 123 is a side of the blade 120 connected to the hub 110, the outer edge 124 is a side of the blade 120 away from the hub 110, the leading edge 121 is a side of the blade 120 facing the wind during rotation, and the trailing edge 122 is a side of the blade 120 facing the wind during rotation.

In this embodiment, the inner edge 123 is fixedly connected to the hub 110, and the hub 110 can drive the whole blade 120 to rotate through the inner edge 123. The outer edge 124 is provided with a silencing groove 125, and the silencing groove 125 is used for eliminating blade tip vortex generated between the outer edge 124 and the flow guide ring 200 when the axial flow fan blade 100 rotates, so that the purposes of silencing and reducing noise are achieved, the noise reduction effect is good, and the user experience is good.

Specifically, in the process that the driving motor drives the axial flow fan blade 100 to rotate, a tip vortex is generated between the outer edge 124 and the flow guide ring 200, the tip vortex enters the silencing groove 125 first and then is discharged out of the silencing groove 125, and in the process, the silencing groove 125 can disturb the formation of the tip vortex, reduce the irregular disturbance of the air flow, thereby eliminating the tip vortex and playing the roles of silencing and reducing the noise.

The silencing groove 125 includes a first side wall 126, a bottom wall 127 and a second side wall 128 connected in sequence, wherein the first side wall 126 is disposed opposite to the second side wall 128. The first side wall 126 and the second side wall 128 are sequentially arranged along the air outlet direction of the axial flow fan blade 100, that is, the first side wall 126 is located at the air inlet side of the axial flow fan blade 100, the second side wall 128 is located at the air outlet side of the axial flow fan blade 100, and in the process that the drive motor drives the axial flow fan blade 100 to rotate, the outlet air flow passes through the blade 120 along the direction from the first side wall 126 to the second side wall 128.

It should be noted that the first side wall 126 is opened with an air inlet hole 129, the second side wall 128 is opened with an air outlet hole 130, the air inlet hole 129 and the air outlet hole 130 are both communicated with the silencing groove 125, air can enter the silencing groove 125 through the air inlet hole 129, and air in the silencing groove 125 can be discharged from the air outlet hole 130.

Further, in the process that the driving motor drives the axial flow fan blade 100 to rotate, air enters the silencing groove 125 from the air inlet hole 129 under the action of negative pressure, and the air entering the silencing groove 125 is divided into two parts, one part of air is discharged outwards from the air outlet hole 130, the other part of air is discharged outwards from a gap between the outer edge 124 and the flow guide ring 200, and the two parts of air can disturb the formation of blade tip vortex, so that the irregular disturbance of air flow is reduced, and the noise generated by the rotation of the axial flow fan blade 100 is reduced.

In this embodiment, the air inlet hole 129 and the air outlet hole 130 are oppositely disposed on two sides of the silencing slot 125, the air inlet hole 129 and the air outlet hole 130 are sequentially disposed along the rotation direction of the axial-flow fan blade 100, that is, the air inlet hole 129 is disposed near the front edge 121, the air inlet hole 129 is disposed on one side of the first sidewall 126 near the front edge 121, the air outlet hole 130 is disposed near the tail edge 122, and the air outlet hole 130 is disposed on one side of the second sidewall 128 near the tail edge 122. Therefore, in the process that the driving motor drives the axial-flow fan blade 100 to rotate, air can be ensured to enter the silencing groove 125 through the air inlet hole 129 and then be discharged out of the silencing groove 125 through the air outlet hole 130 or a gap between the outer edge 124 and the flow guide ring 200.

Specifically, the opening direction of the air inlet hole 129 is inclined to the first side wall 126, so as to reduce the resistance of air entering the air inlet hole 129, ensure that air can smoothly enter the air inlet hole 129 in the process of rotating the axial flow fan blade 100, and improve the air inlet efficiency and the air inlet amount. The opening direction of the exhaust hole 130 is inclined to the second side wall 128, so that the resistance of air exhausted from the exhaust hole 130 is reduced, the air can be smoothly exhausted from the exhaust hole 130 in the rotating process of the axial flow fan blade 100, and the exhaust efficiency and the exhaust amount are improved.

In this embodiment, the number of the air inlets 129 is plural, the plural air inlets 129 are disposed on the first sidewall 126 in a rectangular array, and the plural air inlets 129 cooperate with each other to further improve the air intake efficiency and the air intake amount, so as to ensure that the air entering the silencing slot 125 is enough to disturb the formation of vortex at the blade tip, thereby achieving the purpose of silencing and reducing noise. The number of the exhaust holes 130 is plural, and the plurality of exhaust holes 130 are arranged on the second side wall 128 in a rectangular array, so as to further improve the exhaust efficiency and the exhaust volume, and avoid the occurrence of the condition of airflow disorder caused by untimely exhaust.

Referring to fig. 5, fig. 6 and fig. 7, it is noted that a preset included angle is formed between the first side wall 126 and the second side wall 128, the preset included angle ranges from 30 degrees to 45 degrees, the reasonable preset included angle can ensure that the air flow entering the silencing slot 125 can disturb the formation of the tip vortex, and the silencing and noise reduction effects are good. In this embodiment, the predetermined included angle is 40 degrees, but not limited thereto, in other embodiments, the predetermined included angle may be 30 degrees, and may also be 45 degrees, and the predetermined included angle is not particularly limited.

Further, a maximum spacing between the first and second sidewalls 126, 128 may range from 15 mm to 18 mm, i.e., a spacing between a side of the first sidewall 126 distal from the bottom wall 127 and a side of the second sidewall 128 distal from the bottom wall 127 may range from 15 mm to 18 mm, with a reasonable maximum spacing between the first and second sidewalls 126, 128 being able to ensure that the flow of air exiting the gap between the outer rim 124 and the flow guide ring 200 is sufficient to disrupt the formation of tip vortices. In this embodiment, the maximum distance between the first side wall 126 and the second side wall 128 is 16 mm, but the invention is not limited thereto, and in other embodiments, the maximum distance between the first side wall 126 and the second side wall 128 may be 15 mm or 18 mm, and the maximum distance between the first side wall 126 and the second side wall 128 is not particularly limited.

Further, the depth of the silencing groove 125 in the radial direction of the hub 110 is in the range of 18 mm to 20 mm, and the reasonable depth of the silencing groove 125 in the radial direction of the hub 110 can further ensure that the air flow entering the silencing groove 125 can disturb the formation of the tip vortex. In the present embodiment, the depth of the sound-deadening groove 125 in the radial direction of the hub 110 is 19 mm, but the present invention is not limited thereto, and in other embodiments, the depth of the sound-deadening groove 125 in the radial direction of the hub 110 may be 18 mm or 20 mm, and the depth of the sound-deadening groove 125 in the radial direction of the hub 110 is not particularly limited.

Further, the ratio of the chord length of the outer edge 124 to the chord length at the opening of the silencing slot 125 is in the range of 1.2 to 1.5, and the reasonable ratio of the chord length of the outer edge 124 to the chord length at the opening of the silencing slot 125 can ensure that the vortex at the blade tip is eliminated and simultaneously reduce the influence on the air outlet effect of the axial flow fan as much as possible. In this embodiment, the ratio of the chord length of the outer edge 124 to the chord length at the opening of the silencing slot 125 is 1.35, but the invention is not limited thereto, and in other embodiments, the ratio of the chord length of the outer edge 124 to the chord length at the opening of the silencing slot 125 may be 1.2 or 1.5, and the ratio of the chord length of the outer edge 124 to the chord length at the opening of the silencing slot 125 is not particularly limited.

For ease of understanding, the predetermined included angle formed between the first and second sidewalls 126 and 128 is denoted by a, the maximum distance between the first and second sidewalls 126 and 128 is denoted by a, the depth of the muffling slot 125 in the radial direction of the hub 110 is denoted by B, the chord length of the outer edge 124 is denoted by C, and the chord length at the opening of the muffling slot 125 is denoted by D.

Referring to fig. 2, the hub 110 includes a fixed cylinder 111, a connecting column 112, and a reinforcing rib 113. The spliced pole 112 sets up in fixed section of thick bamboo 111, and the inner wall fixed connection through strengthening rib 113 and fixed section of thick bamboo 111, spliced pole 112 be used for with driving motor's output shaft, inner edge 123 fixed connection is in fixed section of thick bamboo 111's outer wall, and driving motor can drive fixed section of thick bamboo 111 through spliced pole 112 and rotate to drive whole blade 120 and rotate. The reinforcing rib 113 is used to improve the connection strength between the connection column 112 and the fixing cylinder 111, so as to prevent the fixing cylinder 111 from deforming during the rotation process, and improve the stability of the rotation of the hub 110.

Further, the quantity of strengthening rib 113 is a plurality of, and a plurality of strengthening ribs 113 are set up outside spliced pole 112 in annular array, and a plurality of strengthening ribs 113 combined action to further improve spliced pole 112 and the joint strength of fixed cylinder 111, prevent that fixed cylinder 111 from taking place to warp. In this embodiment, the number of the ribs 113 is six, but the present invention is not limited thereto, and in other embodiments, the number of the ribs 113 may be four or eight, and the number of the ribs 113 is not particularly limited.

The embodiment of the utility model provides an axial fan blade 100, blade 120 are provided with inner edge 123 and outer fringe 124 relatively, inner edge 123 and wheel hub 110 fixed connection, and the amortization groove 125 has been seted up to outer fringe 124, and the amortization groove 125 is used for eliminating the apex vortex that produces between outer fringe 124 and the water conservancy diversion circle 200 when axial fan blade 100 rotates. Compared with the prior art, the utility model provides an axial fan blade 100 is owing to adopted the inner edge 123 with wheel hub 110 fixed connection and seted up in the amortization groove 125 of outer fringe 124, so can effectively eliminate the apex vortex that produces between axial fan blade 100 and the water conservancy diversion circle 200, reach the mesh that the amortization was fallen and is made an uproar, and noise reduction is effectual, and user experience is good.

Second embodiment

The utility model provides an air conditioner for regulate and control indoor temperature. The air conditioner comprises an air conditioner outer unit and an air conditioner inner unit, wherein the air conditioner outer unit comprises a condenser, an axial flow fan and a shell, and the axial flow fan comprises a driving motor, axial flow fan blades 100 and a guide ring 200. The basic structure and principle of the axial-flow fan blade 100 and the technical effects thereof are the same as those of the first embodiment, and for brief description, reference may be made to corresponding contents in the first embodiment for the parts that are not mentioned in this embodiment.

In this embodiment, the air conditioner outer unit is installed outdoors, and is connected with the air conditioner indoor unit, and the air conditioner outer unit and the air conditioner indoor unit combined action to realize the function of regulation and control indoor temperature. The condenser and the axial flow fan are both arranged in the shell, the driving motor is connected with the axial flow fan blades 100, and the positions of the axial flow fan blades 100 correspond to the positions of the condenser. The axial flow fan blades 100 can form negative pressure in the rotating process to drive air to flow to form air outlet flow, the air outlet flow can cool the condenser in an air cooling mode to take away heat of the condenser, normal operation of the condenser is guaranteed, and the indoor unit of the air conditioner can perform indoor heating or refrigerating functions.

The embodiment of the utility model provides an air conditioner's beneficial effect the same with the beneficial effect of first embodiment, no longer describe here.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.

Claims (12)

1. The axial flow fan blade is rotatably arranged in a flow guide ring (200), and is characterized by comprising a hub (110) and blades (120), wherein the blades (120) are oppositely provided with an inner edge (123) and an outer edge (124), the inner edge (123) is fixedly connected with the hub (110), the outer edge (124) is provided with a silencing groove (125), and the silencing groove (125) is used for eliminating blade tip vortex generated between the outer edge (124) and the flow guide ring (200) when the axial flow fan blade rotates.

2. The axial-flow fan blade according to claim 1, wherein the muffling slot (125) includes a first side wall (126) and a second side wall (128) that are disposed opposite to each other, the first side wall (126) and the second side wall (128) are sequentially disposed along an air outlet direction of the axial-flow fan blade, the first side wall (126) is provided with an air inlet hole (129), the second side wall (128) is provided with an air outlet hole (130), and the air inlet hole (129) and the air outlet hole (130) are both communicated with the muffling slot (125).

3. The axial-flow fan blade according to claim 2, wherein the air inlet holes (129) and the air outlet holes (130) are oppositely arranged on two sides of the silencing groove (125), and the air inlet holes (129) and the air outlet holes (130) are sequentially arranged along the rotation direction of the axial-flow fan blade.

4. The axial-flow fan blade according to claim 2, wherein the opening direction of the air inlet hole (129) is inclined to the first side wall (126), and the opening direction of the air outlet hole (130) is inclined to the second side wall (128).

5. The axial-flow fan blade according to claim 2, wherein the number of the air inlet holes (129) is plural, and the plural air inlet holes (129) are arranged on the first side wall (126) in a rectangular array; the number of the exhaust holes (130) is multiple, and the exhaust holes (130) are arranged on the second side wall (128) in a rectangular array.

6. The axial-flow fan blade according to claim 2, wherein a preset included angle is formed between the first side wall (126) and the second side wall (128), and the preset included angle ranges from 30 degrees to 45 degrees.

7. The axial flow fan blade according to claim 2, wherein the maximum spacing between the first sidewall (126) and the second sidewall (128) ranges from 15 mm to 18 mm.

8. The axial fan blade according to claim 1, wherein the depth of said muffling slot (125) in the radial direction of said hub (110) ranges from 18 mm to 20 mm.

9. The axial flow blade according to claim 1, characterized in that the ratio of the chord length of the outer edge (124) to the chord length at the opening of the muffling slot (125) ranges from 1.2 to 1.5.

10. The axial-flow fan blade according to claim 1, wherein the hub (110) comprises a fixed cylinder (111), a connecting column (112) and a reinforcing rib (113), the connecting column (112) is arranged in the fixed cylinder (111) and is fixedly connected with the inner wall of the fixed cylinder (111) through the reinforcing rib (113), the connecting column (112) is used for being connected with an output shaft of a driving motor, and the inner edge (123) is fixedly connected with the outer wall of the fixed cylinder (111).

11. The axial-flow fan blade according to claim 10, wherein the number of the reinforcing ribs (113) is plural, and the plural reinforcing ribs (113) are arranged outside the connecting column (112) in an annular array.

12. An air conditioner characterized by comprising the axial-flow fan blade as claimed in any one of claims 1 to 11.

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