airflow guiding structure, air outlet structure, and ceiling fan

Abstract

This invention provides a flow guiding structure, an air outlet structure, and a ceiling fan, comprising: a first flow guiding ring, a second flow guiding ring, and a third flow guiding ring connected in sequence. The first flow guiding ring forms a flow inlet section with a first straight line profile. The second flow guiding ring forms a flow throat section with an arc profile. The third flow guiding ring forms a flow outlet section with a second straight line profile. The radius of the arc profile is R, where 15mm < R < 20mm. The technical solution provided by this invention can solve the problems of high internal flow resistance and low operating efficiency in existing fans.

Description

Technical Field

[0001] This invention relates to the field of fan technology, and more specifically, to a flow guiding structure, an air outlet structure, and a ceiling fan. Background Technology

[0002] Currently, ceiling fans are widely used in various housings such as unit units, export unit units, and multi-split units. Ceiling fans have a long air delivery distance, an attractive appearance, and do not take up much space, which has made them increasingly popular with consumers, resulting in huge market demand.

[0003] However, in the existing technology, poorly designed guide rings can easily affect air intake, and the airflow at the guide ring of the ceiling fan is complex. Vortexes are easily generated at the junction of the centrifugal fan front cover and the impeller, resulting in high internal flow resistance and reduced system efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide a flow guiding structure, an air outlet structure, and a ceiling fan to solve the problems of high internal flow resistance and low working efficiency in existing fans.

[0005] To achieve the above objectives, according to one aspect of the present invention, a flow guiding structure is provided, comprising:

[0006] The first guide ring, the second guide ring, and the third guide ring are connected in sequence. The first guide ring forms the guide inlet section and its profile is a straight line. The second guide ring forms the guide throat section and its profile is an arc section. The third guide ring forms the guide outlet section and its profile is a straight line.

[0007] The radius of the arc segment is R, where 15mm < R < 20mm.

[0008] Furthermore, in the flow guiding structure,

[0009] The first guide ring and the second guide ring are tangentially arranged; and / or,

[0010] The third guide ring is tangent to the second guide ring.

[0011] Furthermore, in the flow guiding structure, the angle between the first straight line and the horizontal plane is β, where 130° < β < 180°.

[0012] Furthermore, the axial height of the flow guiding structure is hd, the axial height of the first flow guiding ring is a, and the axial height of the third flow guiding ring is b;

[0013] 0.2 < b / hd < 0.5; and / or,

[0014] 0 < a / hd < 0.4.

[0015] According to another aspect of the present invention, an air outlet structure is provided, comprising:

[0016] The flow guiding structure provided above;

[0017] The fan blades, at least a portion of which are positioned opposite the airflow guiding structure.

[0018] Furthermore, in the air outlet structure, the third guide ring of the airflow guiding structure extends into the front cover of the fan blade.

[0019] Furthermore, in the air outlet structure, the radius of the third guide ring is Rd, the fan blade includes an impeller and a front cover, the inlet radius of the impeller is R1, and the radius of the front cover of the impeller is Rg;

[0020] Among them, Rg>R1>Rd.

[0021] Furthermore, the third air guide ring is spaced apart from the front cover, the radius of the third air guide ring is Rd, the radius of the front cover is Rg, and the distance between the third air guide ring and the front cover is Ld, where Ld = Rg - Rd;

[0022] Among them, 0.015 < Ld / Rg < 0.025.

[0023] Furthermore, in the air outlet structure, the length of the third guide ring extending into the front cover is hf;

[0024] Where 0.9Ld≤hf≤1.2Ld

[0025] Furthermore, 6mm < Ld < 10mm; and / or,

[0026] 0 < hf < 10 mm.

[0027] The present invention also provides a ceiling fan, including the air outlet structure provided above.

[0028] By applying the technical solution of this invention, a guide inlet section, a guide throat section, and a guide outlet section are formed on the guide ring. Through such a guide ring inlet profile, the airflow can be effectively guided, making the airflow entering the centrifugal fan blade smoother, increasing the intake volume and reducing the internal flow resistance of the fan, thereby improving the efficiency of the fan. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0030] Figure 1 A schematic diagram of a guide ring according to Embodiment 1 of the present invention is shown; and

[0031] Figure 2A front view of the guide ring according to Embodiment 1 of the present invention is shown;

[0032] Figure 3 A top view of the guide ring according to Embodiment 1 of the present invention is shown;

[0033] Figure 4 A schematic diagram of the fit between the guide ring and the fan blade according to Embodiment 2 of the present invention is shown;

[0034] Figure 5 A magnified view of a portion at point A is shown;

[0035] Figure 6 A cross-sectional schematic diagram of the guide ring and fan blade assembly according to Embodiment 2 of the present invention is shown.

[0036] The above figures include the following reference numerals:

[0037] 10. First guide ring; 20. Second guide ring; 30. Third guide ring;

[0038] 40. Fan blade; 41. Impeller; 42. Front cover. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] Please refer to Figures 1 to 3 In Embodiment 1 of the present invention, a flow guiding structure is provided, comprising: a first flow guiding ring 10, a second flow guiding ring 20, and a third flow guiding ring 30 connected in sequence. The first flow guiding ring 10 forms a flow guiding inlet section, and its profile is a first straight line. The second flow guiding ring 20 forms a flow guiding throat section, and its profile is an arc section. The third flow guiding ring 30 forms a flow guiding outlet section, and its profile is a second straight line. The radius corresponding to the arc section is R, where 15mm < R < 20mm.

[0041] With this configuration, by setting up the first guide ring 10, the second guide ring 20, and the third guide ring 30, and forming a guide ring inlet profile with a guide inlet section, a guide throat section, and a guide outlet section, the airflow can be effectively converged and guided by limiting the size of the second guide ring 20, making the airflow entering the fan blade 40 smoother, increasing the air intake volume and reducing the internal flow resistance of the fan, thereby improving the efficiency of the fan.

[0042] Specifically, in this embodiment, the fan blade 40 can be a centrifugal fan blade.

[0043] It should be noted that in this embodiment, the first guide ring 10, the second guide ring 20, and the third guide ring 30 are all annular structures. The profile of the first guide ring 10 can be understood as being able to form the first guide ring 10 after rotating around the axis. The profile of the second guide ring 20 can be understood as being able to form the second guide ring 20 after rotating around the axis. The profile of the third guide ring 30 can be understood as being able to form the third guide ring 30 after rotating around the axis.

[0044] In this embodiment, the first guide ring 10 is tangentially arranged with the second guide ring 20; and / or, the third guide ring 30 is tangentially arranged with the second guide ring 20. This tangential arrangement reduces the resistance encountered by the airflow when passing through the inlet without increasing manufacturing difficulty.

[0045] In this embodiment, the angle between the first straight line and the horizontal plane is β, where 130° < β < 180°. This setting facilitates the collection of air, effectively increasing the intake volume, and optimizes the airflow before it enters the fan, making the airflow smoother.

[0046] Specifically, the axial height of the flow guiding structure is hd, the axial height of the first flow guiding ring 10 is a, and the axial height of the third flow guiding ring 30 is b; 0.2 < b / hd < 0.5; and / or, 0 < a / hd < 0.4.

[0047] By setting the ratio range: 0.2 < b / hd < 0.5, the axial height of the third guide ring 30 can be kept within a suitable range, so as to facilitate the smooth flow of air through the third guide ring 30.

[0048] By setting the ratio range: 0 < a / hd < 0.4, it is possible to keep the axial height of the first guide ring 10 within a suitable range, so as to facilitate the wind collection effect through the first guide ring 10.

[0049] By limiting b / hd and a / hd, the axial height c of the second guide ring 20 can be obtained within a suitable range, thus facilitating the overall optimization of the guide structure and improving the guide effect.

[0050] In this embodiment, the height of the third guide ring 30 is hd, where 10mm < hd < 20mm. Limiting the height of the third guide ring 30 at the outlet section to this range can make the airflow entering the fan blade 40 more stable and improve aerodynamic performance.

[0051] In this embodiment, the flow guiding structure further includes a mounting plate (also known as a flow guiding ring) that surrounds the periphery of the first flow guiding ring 10. The mounting plate is used to connect with the housing to fix the flow guiding structure onto the housing. A recessed mounting portion is also provided on the mounting plate to mount the electrical box at the recessed mounting portion.

[0052] like Figure 4 , Figure 5 and Figure 6 In a second embodiment of the present invention, an air outlet structure is provided, comprising: any one of the above-described flow guiding structures and a fan blade 40, wherein at least a portion of the fan blade 40 is disposed opposite to the flow guiding structure. Through the coordinated design of the flow guiding structure and the fan blade 40, the flow at the intersection of the flow guiding ring, the centrifugal fan blade front cover 42, and the impeller 41 can be effectively improved, the vortex at the leading edge of the impeller 41 can be weakened, the flow resistance can be reduced, and the performance of the fan blade 40 can be improved.

[0053] In this embodiment, the third guide ring 30 of the guide structure extends into the front cover 42 of the fan blade 40. By designing the length of the guide ring extending into the fan blade 40, the airflow is better guided to the front cover 42, reducing backflow and improving the working efficiency of the fan.

[0054] In this embodiment, the radius of the third guide ring 30 is Rd, and the fan blade 40 includes an impeller 41 and a front cover 42. The inlet radius of the impeller 41 (i.e., the radius corresponding to the arc surface of the structure near the end of the guide structure of the impeller 41) is R1, and the radius of the front cover 42 of the impeller 41 is Rg (i.e., the radius corresponding to the arc surface formed by the inner wall of the front cover 42 near the end of the guide structure). Specifically, Rg > R1 > Rd. This radius relationship facilitates the installation and fit between the guide ring and the fan blade 40, while ensuring that all the airflow guided down enters the fan, increasing the fan's intake volume and improving system efficiency.

[0055] Specifically, in this embodiment, the third guide ring 30 and the front cover 42 are spaced apart. The radius of the third guide ring 30 is Rd, the radius of the front cover 42 is Rg, and the distance between the third guide ring 30 and the front cover 42 is Ld, where Ld = Rg - Rd; and 0.015 < Ld / Rg < 0.025. This structural arrangement ensures that the gap between the third guide ring 30 and the front cover 42 is within a suitable range. This avoids interference with the fan blades 40 due to an excessively small gap, while also minimizing the possibility of airflow leakage due to an excessively large gap. Specifically, Ld / Rg can be selected as 0.02.

[0056] In this embodiment, the length of the third guide ring 30 extending into the front cover 42 is hf; wherein, 0.9Ld≤hf≤1.2Ld. This structural arrangement ensures that the length of the third guide ring 30 extending into the fan blade 40 is within a suitable range, avoiding interference with the fan blade 40 due to excessively small spacing, while also minimizing the possibility of airflow escaping from the gap due to excessively large spacing.

[0057] Preferably, Ld can be made equal to hf.

[0058] Specifically, 6mm < Ld < 10mm. By controlling the distance between the third guide ring 30 and the front cover 42 within this range, leakage can be minimized without increasing the processing difficulty, thereby minimizing flow loss. Furthermore, when the fan blade 40 rotates at high speed, a certain amount of space can be left to avoid the thermal expansion of the fan blade 40.

[0059] Specifically, 0 < hf < 10 mm. By designing the fit gap between the guide ring and the fan blade 40, as well as the length of the guide ring extending into the fan blade 40, collisions between the guide ring and the fan blade 40 can be avoided, and the airflow can be better guided to the front cover 42, reducing backflow in the gap.

[0060] In this embodiment, the guide ring of the present invention is as follows: Figures 1 to 3 As shown, the third guide ring 30 is the guide ring outlet section, the second guide ring 20 is the guide ring throat section, and the first guide ring 10 is the guide ring collecting section. A throat section, the second guide ring 20, serves as a transition between the guide ring inlet collecting section (first guide ring 10) and the outlet section (third guide ring 30). Air enters the guide ring through the first guide ring 10, where it is gathered, and then enters the fan blade 40 through the throat section (second guide ring 20) and the outlet section (first guide ring 10).

[0061] The cross-sectional shape of the third guide ring 30 (i.e., the guide outlet section) of this invention is a straight line, vertically downward, with a length of b, b∈(10,20)mm, preferably b=18mm. The profile of the first guide ring 10 (i.e., the guide inlet section) is also a straight line, with an angle β with the horizontal plane, β∈(130,180)°, preferably β=155°. The first guide ring 10 and the third guide ring 30 are connected by the second guide ring 20 (i.e., the guide throat section). The profiles of the second guide ring 20 and the third guide ring 30 are designed to be tangent to the profile of the first guide ring 10, with a preferred arc segment radius R of 20mm. Preferably, by reasonably setting the above dimensions, the airflow can be effectively converged, the intake volume increased, the intake resistance reduced, the airflow entering the fan blade 40 stabilized, and the aerodynamic performance of the intake optimized.

[0062] The fitting relationship between the guide ring and the fan blade 40 described in this invention is as follows: Figure 4, Figure 5 and Figure 6 As shown, the fan blade 40 includes a front cover 42, an impeller 41, and a rear cover. The third guide ring 30 of the outlet section of the guide ring extends into the fan blade 40 with an extension length of hf. Due to the limitation of the impeller 41 of the fan blade 40, the extension length hf has a certain range, otherwise it will collide with the impeller 41. hf∈(0,10)mm, and preferably hf=8mm.

[0063] The inlet radius of the guide ring is Rd, the inlet radius of impeller 41 is R1, and the radius of impeller 41 is Rg. The relationship between R, R1, and R2 is Rg > R1 > Rd, where Rg ∈ [220, 250] mm, preferably R = 230 mm. R1 ∈ [180, 200] mm, preferably R = 182 mm. Rd ∈ [186, 210] mm, preferably R = 192 mm.

[0064] In the prior art, a gap exists between the guide ring and the fan blade 40. Air flows back to the inlet from the gap and mixes with the inlet airflow. The airflow flows from the high-pressure side to the low-pressure side, which leads to pressure loss, resulting in a decrease in the static pressure and efficiency of the fan blade 40, an increase in noise, and the generation of leakage vortices at this point, causing flow channel blockage. This gap is the gap Ld between the third guide ring 30 and the front cover 42 at the outlet section of the guide ring, where Ld ∈ (6,10) mm, preferably Ld = 8 mm. The airflow exiting the impeller 41 outlet will flow back through this gap, mix with the inlet airflow, and re-enter the circulation, causing flow loss. Theoretically, the smaller the gap Ld, the better for reducing leakage. However, due to limitations in actual production precision and considering the deformation of the fan blade 40 under high speed and high and low temperature conditions, a moderate gap is sufficient. The specific situation depends on the material and size of the fan blade 40 and the guide ring used. In this embodiment, the selected gap Ld is the optimal size that meets the above strength requirements.

[0065] By designing the guide ring's radial profile (i.e., the plane passing through the axis), the structure of the guide ring is optimized, which facilitates air intake, makes air intake smoother, and reduces air loss during intake. At the same time, by optimizing the matching parameters between the guide ring and the centrifugal fan blades, leakage loss is reduced, which can effectively improve air intake efficiency and optimize the noise and air volume of the ceiling fan.

[0066] In a third embodiment of the present invention, a ceiling fan is provided, which includes the air outlet structure in the above embodiments.

[0067] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: In the present invention, by setting the first guide ring 10, the second guide ring 20, and the third guide ring 30 to form a guide ring inlet profile with a guide inlet section, a guide throat section, and a guide outlet section, the airflow can be effectively guided, making the air intake smooth, increasing the air intake volume, and improving the efficiency of the fan blade 40. At the same time, by designing parameters such as the distance between the third guide ring 30 and the front cover 42 as Ld and the length of the third guide ring 30 extending into the front cover 42 as hf, the present invention can effectively improve the flow at the intersection of the guide ring, the centrifugal fan blade front cover 42, and the impeller 41, weaken the vortex at the leading edge of the impeller 41, reduce flow resistance, and improve the performance of the fan blade 40.

[0068] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0070] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0071] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0072] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flow guiding structure, characterized in that, include: A first guide ring (10), a second guide ring (20), and a third guide ring (30) are connected in sequence. The first guide ring (10) forms a guide inlet section with a first straight line profile. The second guide ring (20) forms a guide throat section with an arc profile profile. The third guide ring (30) forms a guide outlet section with a second straight line profile. The radius of the arc segment is R, where 15mm < R < 20mm.

2. The flow guiding structure according to claim 1, characterized in that, The first guide ring (10) is tangentially disposed to the second guide ring (20); and / or, The third guide ring (30) is tangential to the second guide ring (20).

3. The flow guiding structure according to claim 1, characterized in that, The angle between the first straight line and the horizontal plane is β, 130°. ＜β＜180°。 4. The flow guiding structure according to claim 1, characterized in that, The axial height of the flow guiding structure is hd, the axial height of the first flow guiding ring (10) is a, and the axial height of the third flow guiding ring (30) is b. 0.2 < b / hd < 0.5; and / or, 0 < a / hd < 0.

4.

5. An air outlet structure, characterized in that, include: The flow guiding structure according to any one of claims 1 to 4; A fan blade (40), at least a portion of which is disposed opposite to the airflow guiding structure.

6. The air outlet structure according to claim 5, characterized in that, The third guide ring (30) of the guide structure extends into the front cover (42) of the fan blade (40).

7. The air outlet structure according to claim 5, characterized in that, The radius of the third guide ring (30) is Rd, the fan blade (40) includes an impeller (41) and a front cover (42), the inlet radius of the impeller (41) is R1, and the radius of the front cover (42) is Rg; Among them, Rg>R1>Rd.

8. The air outlet structure according to claim 6, characterized in that, The third guide ring (30) is spaced apart from the front cover (42). The radius of the third guide ring (30) is Rd, the radius of the front cover (42) is Rg, and the distance between the third guide ring (30) and the front cover (42) is Ld, where Ld = Rg - Rd. Among them, 0.015 < Ld / Rg < 0.

025.

9. The air outlet structure according to claim 8, characterized in that, The length of the third guide ring (30) extending into the front cover (42) is hf; Where 0.9Ld≤hf≤1.2Ld.

10. The air outlet structure according to claim 9, characterized in that, 6mm < Ld < 10mm; and / or, 0 < hf < 10 mm.

11. A ceiling machine, characterized in that, The air outlet structure includes any one of claims 5 to 10.

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