Axial flow fan and air conditioner

Abstract

The application discloses an axial flow fan and an air conditioner. The axial flow fan comprises a casing, a fan blade and a flow guide ring. The fan blade is arranged in the casing. The flow guide ring is connected with an air outlet end of the casing. The flow guide ring comprises a flow guide ring body and an annular inner ring arranged on an air flow passage of the flow guide ring body. A first end of the annular inner ring is connected with the flow guide ring body, and an edge of a second end of the annular inner ring is provided with a plurality of sawteeth distributed in a circumferential direction. The air flow passage of the flow guide ring of the axial flow fan is provided with the annular inner ring, and the edge of the annular inner ring is provided with the plurality of sawteeth. The plurality of sawteeth divide relatively concentrated large-scale vortexes into small-scale vortexes, so that the wideband noise in the fan is reduced, the strength of a dipole sound source in the flow guide ring is weakened, and the noise is further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to an axial flow fan and an air conditioner. BACKGROUND

[0002] For an air conditioner outdoor unit, the noise of the axial flow fan is an important part of the evaluation of its wind noise performance. Referring to Figure 1 In related technologies, the flow guide ring 10a is arranged on the casing 20a of the axial flow fan to help guide the uniform flow of the fan airflow, but the airflow at the blade tip of the fan blade 30a and the flow guide ring 10a is prone to form a dipole sound source noise, and therefore how to improve the noise is a problem to be solved. SUMMARY

[0003] The present application provides an axial flow fan and an air conditioner to reduce noise.

[0004] The first aspect of the present application provides an axial flow fan, comprising:

[0005] a casing;

[0006] a fan blade arranged in the casing; and

[0007] a flow guide ring connected to an air outlet end of the casing, and the flow guide ring comprises a flow guide ring body and an annular inner ring arranged on an airflow passage of the flow guide ring body, a first end of the annular inner ring is connected to the flow guide ring body, and an edge of a second end of the annular inner ring is provided with a plurality of sawteeth distributed in a circumferential direction.

[0008] In some embodiments, the axial flow fan comprises at least two annular inner rings arranged at intervals in the flow direction of the airflow.

[0009] In some embodiments, in the flow direction of the airflow, the tooth spacing of the sawteeth of the at least two annular inner rings gradually decreases.

[0010] In some embodiments, the at least two annular inner rings comprise a first annular inner ring arranged at the air outlet end of the flow guide ring body and at least one second annular inner ring arranged on an inner wall of the flow guide ring body.

[0011] In some embodiments, the sawteeth comprise triangular sawteeth, trapezoidal sawteeth or arc-shaped sawteeth.

[0012] In some embodiments, the size of the angle between the wall surface of the annular inner ring and the horizontal plane is configured to be related to the installation angle of the fan blade.

[0013] In some embodiments, the size of the angle between the wall surface of the annular inner ring and the horizontal plane is configured to be negatively related to the installation angle of the fan blade.

[0014] In some embodiments, the wall surface of the annular inner ring is inwardly inclined towards the axis of the casing.

[0015] In some embodiments, the inner diameter of the guide ring body gradually increases in the flow direction of the airflow.

[0016] A second aspect of the present application provides an air conditioner, comprising the above-mentioned axial flow fan.

[0017] Based on the various aspects provided in the present application, the axial flow fan includes a casing, fan blades and a guide ring. The fan blades are arranged in the casing. The guide ring is connected to the air outlet end of the casing. The guide ring includes a guide ring body and an annular inner ring arranged on the air flow channel of the guide ring body. The first end of the annular inner ring is connected to the guide ring body, and the edge of the second end of the annular inner ring is provided with a plurality of serrations distributed in the circumferential direction. The air flow channel of the guide ring of the axial flow fan of the present application is provided with an annular inner ring, and the edge of the annular inner ring is provided with a plurality of serrations, and the plurality of serrations divides the relatively concentrated large-scale vortices into small-scale vortices, thereby reducing the broadband noise in the fan, weakening the intensity of the dipole sound source in the guide ring, and further reducing the noise.

[0018] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 Schematic diagram of the structure of an axial flow fan in related technology.

[0021] Figure 2 This is a schematic structural diagram of an axial flow fan according to some embodiments of the present application.

[0022] Figure 3 for Figure 2 The enlarged partial structure diagram of the axial fan is shown.

[0023] Figure 4 Schematic diagram of the structure of axial flow fans according to other embodiments of the present application.

[0024] Figure 5 for Figure 4 Schematic diagram of the locally enlarged structure of part P.

[0025] Figure 6 for Figure 4 Schematic diagram of the locally enlarged structure of the middle Q part.

[0026] Figure 7 This is a schematic structural diagram of the guide ring body of the axial flow fan according to an embodiment of the present application.

[0027] Figure 8 For Figure 7 Local enlarged structural diagram of M part in the middle.

[0028] Figure 9 Structural diagram of the fan blade of the axial flow fan of the embodiment of the present application.

[0029] Label description:

[0030] 10a, flow guide ring; 20a, machine shell;

[0031] 10, flow guide ring;

[0032] 11, flow guide ring body; 12, annular inner ring; 12A, first annular inner ring; 12B, second annular inner ring; 12C, third annular inner ring; 121, sawtooth;

[0033] 20, machine shell;

[0034] 30, fan blade; DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0036] Unless otherwise specifically stated, the relative arrangements of parts and steps, numerical expressions, and numerical values set forth in the various examples herein are only meant to be illustrative, and not limiting of the scope of the present application. Additionally, it is to be understood that the drawings are not necessarily to scale, with emphasis instead being placed upon illustrating the principles of the present application. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but rather can be assumed to be known in the art, as appropriate. In the examples shown and discussed herein, any specific values should be interpreted to be merely exemplary, and not limiting. Other examples of the exemplary embodiments can have different values. It is noted that like numbers and letters on the figures identify like items throughout the several figures, and thus, once an item is defined in one figure, it is not necessary to discuss it further in connection with other figures.

[0037] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "below" other elements or features would then be oriented "below" or "above" other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatial relative terms used herein interpreted accordingly.

[0038] Reference Figure 2 The axial flow fan of some embodiments of the present application comprises a casing 20, a fan blade 30 and a guide ring 10. The fan blade 30 is arranged in the casing 20. The guide ring 10 is connected to the air outlet end of the casing 20. The guide ring 10 comprises a guide ring body 11 and an annular inner ring 12 arranged on the air flow passage of the guide ring body 11. The first end of the annular inner ring 12 is connected to the guide ring body 11, and the edge of the second end of the annular inner ring 12 is provided with a plurality of sawteeth 121 distributed in the circumferential direction.

[0039] The air flow passage of the guide ring 10 of the axial flow fan of the embodiments of the present application is provided with the annular inner ring 12, and the edge of the annular inner ring 12 is provided with the plurality of sawteeth 121. The plurality of sawteeth 121 divides the relatively concentrated large-scale vortex into small-scale vortex, thereby reducing the wideband noise in the fan, weakening the intensity of the dipole sound source in the guide ring, and further reducing the noise.

[0040] In Figure 2 In the specific embodiments shown, the bottom end of the casing 20 is the air inlet end, and the top end is the air outlet end. At this time, the guide ring 10 is connected to the top end of the casing 20 and is located above the casing 20. Specifically, the guide ring body 11 is smoothly connected to the outlet end of the casing 20. The inner cavity of the guide ring body 11 forms an air flow passage for guiding the air flow of the fan. The annular inner ring 12 arranged on the air flow passage means that the annular inner ring 12 can be arranged on the inner wall of the guide ring body 11 or on the outlet end of the guide ring body 11, so that the vortex in the air flow passage can be divided by the sawteeth 121, thereby reducing the noise.

[0041] As Figure 2 And Figure 3As shown, the first end of the annular inner ring 12 is connected with the guide vane body 11, and the second end of the annular inner ring 12 is a free end. The annular inner ring 12 extends in the circumferential direction of the guide vane body 11. The plurality of sawteeth 121 are uniformly distributed in the circumferential direction of the annular inner ring 12.

[0042] As shown in FIG. 1, the annular inner ring 12 is arranged in the air inlet 21 of the casing 20. The annular inner ring 12 is arranged in the air inlet 21 of the casing 20. Figure 6 As shown, the shape of the sawteeth 121 can be triangular sawteeth, trapezoidal sawteeth, or arc-shaped sawteeth. The shape of the sawteeth 121 is not limited herein.

[0043] As shown in FIG. 1, the annular inner ring 12 is arranged in the air inlet 21 of the casing 20. The annular inner ring 12 is arranged in the air inlet 21 of the casing 20. Figure 2 、 Figure 4 and Figure 5 In some embodiments, the size of the included angle a between the wall surface of the annular inner ring 12 and the horizontal plane is configured to be related to the installation angle of the fan blade 30. As shown in FIG. 1, the blade root of the fan blade 30 is connected with the hub. The installation angle b of the fan blade 30 refers to the included angle between the line connecting the two end points of the blade root of the fan blade 30 and the horizontal plane. The installation angle of the fan blade determines the inclination angle of the fan blade, and thus affects the performance of the fan blade. The included angle of the wall surface of the annular inner ring 12 is set according to the performance of the fan blade to adaptively adjust the airflow of the axial flow fan. Figure 9

[0044] Specifically, the size of the included angle a between the wall surface of the annular inner ring 12 and the horizontal plane is configured to be negatively related to the installation angle b of the fan blade 30. When the installation angle b of the fan blade 30 is large, noise vortices are easy to overflow the fan blade, at which time the included angle a between the wall surface of the annular inner ring 12 and the horizontal plane can be configured to be small to play a role in vortex dissipation. When the installation angle b of the fan blade 30 is small, the air duct resistance is large, and noise vortices are easy to stay inside the fan, at which time the included angle a between the wall surface of the annular inner ring 12 and the horizontal plane can be configured to be large to timely guide out the noise vortices.

[0045] Specifically, in the embodiment shown in FIG. 1, the wall surface of the annular inner ring 12 is inwardly inclined towards the axis of the casing 20. The first end of the annular inner ring 12 is connected with the guide vane body 11. From the first end to the second end, the wall surface of the annular inner ring 12 is inwardly inclined, i.e., in the direction from the air inlet end to the air outlet end, the wall surface of the annular inner ring 12 is in a tapered shape. Figure 2 In order to cut vortices at different positions in the flow direction of the airflow, in some embodiments, referring to FIG. 1, the axial flow fan comprises at least two annular inner rings 12 arranged at intervals in the flow direction of the airflow.

[0046] Figure 2 In some embodiments, in the flow direction of the airflow, the tooth spacing of the sawteeth of the at least two annular inner rings 12 gradually decreases. As shown in FIG. 1, the tooth spacing of the sawteeth of the annular inner ring 12 gradually decreases from the first end to the second end. Figure 3

[0047] Figure 6 ​​​​As shown, the tooth pitch refers to the distance between two adjacent saw teeth 121. As the airflow flows, the sawtooth pitch gradually decreases. In this way, during the flow of air, the noise vortex is first roughly separated by the sawtooth with a large tooth pitch, then further separated by the sawtooth with a medium tooth pitch, and finally refined and separated by the sawtooth with a small tooth pitch to further reduce noise.

[0048] In some embodiments, the at least two annular inner rings include a first annular inner ring 12A disposed at the air outlet end of the guide ring body 11 and at least one second annular inner ring 12B disposed on the inner wall of the guide ring body 11 .

[0049] like Figure 2 and Figure 3 As shown, in some embodiments, the guide ring body 11 of the axial flow fan is provided with three annular inner rings 12, specifically, including a first annular inner ring 12a located at the air outlet end and two second annular inner rings 12B disposed on the inner wall of the guide ring body 11. The first end of the first annular inner ring 12a is connected to the air outlet end of the guide ring body 11, and the second end of the first annular inner ring 12a is freely disposed, that is, the first annular inner ring 12a is disposed on the outside of the guide ring body 11. The second annular inner ring 12b is disposed on the inside of the guide ring body 11, specifically, connected to the inner wall of the guide ring body 11.

[0050] like Figures 4 to 6 As shown, in other embodiments, two annular inner rings 12 are provided on the guide ring body 11 of the axial flow fan, and the two annular inner rings include a first annular inner ring 12a located at the air outlet end and a second annular inner ring 12B provided on the inner wall of the guide ring body 11.

[0051] In a specific embodiment, the width L from the first end to the second end of the annular inner ring 12 is 10 mm to 20 mm.

[0052] In order to reduce the aggregation effect of blade tip vortex and thus further improve the noise of the fan, in some embodiments, the inner diameter of the guide ring body 11 gradually increases in the flow direction of the airflow. Specifically, the wall surface of the guide ring body 11 is a curved surface.

[0053] The present application provides an air conditioner, comprising the above-mentioned axial flow fan. The air conditioner comprises an outdoor unit, and the outdoor unit comprises the above-mentioned axial flow fan.

[0054] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not to limit the same; although the present application has been described in detail with reference to the preferred embodiments, it is understood by those skilled in the art that the specific implementation of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, all of them should be covered in the technical solution range claimed by the present application.

Claims

1. An axial flow fan characterised in that, Comprising: a casing (20); a fan blade (30) disposed in the casing (20); and a guide ring (10) connected to an air outlet end of the casing (20), the guide ring (10) comprising a guide ring body (11) and at least two annular inner rings (12) disposed on an air flow passage of the guide ring body (11), the at least two annular inner rings (12) being spaced apart in a flow direction of the air flow, tooth intervals of sawteeth of the at least two annular inner rings (12) gradually decreasing in the flow direction of the air flow, a first end of the annular inner ring (12) being connected to the guide ring body (11), and an edge of a second end of the annular inner ring (12) being provided with a plurality of sawteeth (121) distributed in a circumferential direction. The at least two annular inner rings comprise a first annular inner ring (12A) disposed at an air outlet end of the guide ring body (11) and at least one second annular inner ring (12B) disposed on an inner wall of the guide ring body (11).

2. The axial fan according to claim 1, characterized in that The sawteeth (121) comprise triangular sawteeth, trapezoidal sawteeth or arc sawteeth.

3. The axial fan of claim 1, wherein An included angle between a wall surface of the annular inner ring (12) and a horizontal plane is configured to be related to an installation angle of the fan blade (30).

4. The axial fan of claim 1, wherein The included angle between the wall surface of the annular inner ring (12) and the horizontal plane is configured to be inversely related to the installation angle of the fan blade (30).

5. The axial fan of claim 4, wherein The wall surface of the annular inner ring (12) is inwardly inclined towards an axis of the casing (20).

6. The axial fan of claim 4, wherein, In the flow direction of the air flow, an inner diameter of the guide ring body (11) gradually increases.

7. The axial fan of claim 1, wherein A centrifugal fan comprising the axial flow fan as claimed in any one of claims 1 to 7.

8. An air conditioner, characterized in that: ​

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