CN111810422B - Bladeless ceiling fan capable of adjusting airflow field type - Google Patents

Abstract

The invention provides a bladeless ceiling fan capable of adjusting an airflow field type, which comprises an airflow generating component, a first airflow guiding component, a second airflow guiding component, a flow rate regulating and controlling component, an outer ring structure and an inner ring structure. The airflow generating assembly is used for generating an airflow, and the airflow flows into the first airflow guide part and the second airflow guide part to respectively form an outer annular airflow and an inner annular airflow. The flow rate regulating component is used for regulating the flow rate of at least one of the outer annular airflow and the inner annular airflow. The outer ring airflow will flow into the outer ring structure and form an outer ring-shaped axial airflow to be output from the outer ring structure. The inner ring airflow will flow into the inner ring structure and form an inner ring axial airflow to be output from the inner ring structure. When the flow rate of the outer ring airflow is larger than that of the inner ring airflow, a concentrated airflow is formed. Otherwise, a divergent air flow is formed.

Description

Bladeless ceiling fan capable of adjusting airflow field type

Technical Field

The present invention relates to a bladeless fan, and more particularly to a bladeless ceiling fan with adjustable airflow pattern.

Background

In humid and hot climates, electric fans are essential household appliances for every family. The fan is used for generating air flow, the air flow can make a user feel cool in hot weather, and the air flow can be used for drying damp clothes in damp weather.

The electric fan in the prior art generally comprises a plurality of fan blades, and when the electric fan runs, the fan blades can rotate to generate air flow and simultaneously can be accompanied with noise. Moreover, the electric fan is generally a centrifugal fan, and the flow field of the airflow generated by the fan blades is unstable and cannot be adjusted. Generally, the electric fan capable of generating stronger wind speed has larger noise when operating, for example, the noise generated by an industrial electric fan is much larger than that generated by a common household electric fan.

The general electric fan has a certain volume, and particularly, the electric fan with stronger wind speed can be generated, the volume of the electric fan is usually larger, and the space utilization rate of a home can be wasted in the modern society that the price of the house is continuously increased. In addition, the fan blades of the electric fan are also prone to causing danger to children at home.

The ceiling fan in the prior art is hung on a ceiling plate, so that the waste of the space utilization rate in a home can be avoided, but the ceiling fan is still a centrifugal fan and still provided with a plurality of fan blades, and the problems of unstable flow field, incapability of adjusting the flow field, noise generation and the like of the electric fan can be solved.

In addition, the material of flabellum generally is the plastic, can make static increase with air friction when rotatory, makes the dust adhere to easily, so often need dismantle the flabellum and wash, just can keep the cleanness of flabellum, also can avoid the air current that the flabellum produced to mix with the dust.

Disclosure of Invention

In view of the problems in the prior art, the flow field of the airflow generated by the fan blades of the electric fan and the ceiling fan is unstable, the flow field can not be adjusted, noise is accompanied, dust is easy to adhere, and the like. It is a primary object of the present invention to provide a flabellless ceiling fan that solves at least one of the problems of the prior art.

The present invention is directed to solving the problems of the prior art, and the essential technical means of the present invention is to provide a bladeless ceiling fan capable of adjusting an airflow pattern, which is hung on a ceiling plate, and comprises an airflow generating assembly, a first airflow guiding member, a second airflow guiding member, a flow rate adjusting assembly, an outer ring structure and an inner ring structure.

The airflow generating assembly is used for generating an airflow in an airflow generating space. The first airflow guiding piece is provided with an outer annular airflow channel communicated with the airflow generating space, and a first air inlet is arranged between the outer annular airflow channel and the airflow generating space, so that airflow flows into the outer annular airflow channel through the first air inlet to form outer annular airflow. The second airflow guiding piece is provided with an inner ring airflow channel communicated with the airflow generating space, and a second air inlet is arranged between the inner ring airflow channel and the airflow generating space, so that airflow flows into the inner ring airflow channel through the second air inlet to form inner ring airflow.

The flow rate control assembly is movably arranged adjacent to the first air inlet and the second air inlet and used for adjusting at least one of a first shielding rate for shielding the first air inlet and a second shielding rate for shielding the second air inlet so as to adjust the flow rate of at least one of the outer ring airflow and the inner ring airflow. The outer ring structure is connected with the first airflow guide piece and is provided with an outer ring channel communicated with the outer ring airflow channel, so that the outer ring airflow generates a flow increasing effect in the outer ring channel and outputs an outer ring-shaped axial airflow. The inner ring structure is connected with the second airflow guide piece and is provided with an inner ring channel communicated with the inner ring airflow channel, so that the inner ring airflow generates a flow increasing effect in the inner ring channel and outputs an inner ring-shaped axial airflow.

When the flow rate regulation and control assembly is moved to enable the flow rate of the outer ring airflow to be larger than that of the inner ring airflow, local outer ring axial airflow and inner ring axial airflow are converged into a concentrated airflow; when the flow rate regulating and controlling component is moved to enable the flow rate of the outer annular airflow to be smaller than that of the inner annular airflow, the outer annular axial airflow and the local inner annular axial airflow are converged into a dispersion type airflow.

Based on the above-mentioned necessary technical means, an accessory technical means derived from the present invention is that the airflow generating assembly in the bladeless ceiling fan with adjustable airflow pattern comprises a centrifugal fan for generating airflow.

Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is to provide the airflow generating assembly in the bladeless ceiling fan with adjustable airflow pattern, further comprising a dc motor connected to the centrifugal fan for driving the centrifugal fan to rotate to generate the airflow.

Based on the above-mentioned technical solutions, an accessory technical solution derived from the present invention is that the flow rate adjusting and controlling assembly in the bladeless ceiling fan capable of adjusting the airflow pattern comprises a baffle plate for adjusting at least one of the first shielding rate and the second shielding rate.

Based on the above-mentioned technical solutions, an accessory technical solution derived from the present invention is to provide a flow rate adjusting and controlling assembly in a bladeless ceiling fan capable of adjusting an airflow pattern, further comprising a stepping motor, wherein the stepping motor is connected to the baffle plate for driving the baffle plate to move so as to adjust at least one of the first shielding rate and the second shielding rate.

Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is a bladeless ceiling fan capable of adjusting airflow pattern, further comprising a connecting element for connecting the ceiling.

Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is to provide a bladeless ceiling fan with adjustable airflow pattern, further comprising a light emitting device for generating a light source.

Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is to provide an outer ring structure of a bladeless ceiling fan with adjustable airflow pattern, wherein the outer ring structure is annularly provided with an outer ring air outlet for outputting an outer ring axial airflow.

Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is to provide an inner ring structure in the bladeless ceiling fan with adjustable airflow pattern, wherein the inner ring structure is annularly provided with an inner ring air outlet for outputting inner ring axial airflow.

In view of the above, the bladeless ceiling fan with adjustable airflow pattern provided by the present invention utilizes the airflow generating assembly and the flow rate regulating assembly to adjust the flow rate of at least one of the outer annular airflow and the inner annular airflow, and further adjusts the outer annular axial airflow output by the outer annular structure and the inner annular axial airflow output by the inner annular structure to form one of the concentrated airflow and the divergent airflow, thereby achieving the effect of adjusting the airflow pattern.

Drawings

FIG. 1 is an exploded perspective view of a bladeless ceiling fan with adjustable airflow patterns according to a preferred embodiment of the present invention;

FIG. 2 is a perspective view of a bladeless ceiling fan with adjustable airflow patterns according to a preferred embodiment of the present invention;

FIG. 3 is a cross-sectional view A-A showing an application of FIG. 2;

FIG. 4 is a partial cross-sectional view showing B-B of FIG. 3;

FIG. 5 is a cross-sectional view of C-C showing an application of FIG. 2;

FIG. 6 is a cross-sectional view A-A showing another application of FIG. 2;

FIG. 7 is a partial cross-sectional view showing D-D of FIG. 6; and

fig. 8 is a cross-sectional view of C-C showing another application of fig. 2.

[ notation ] to show

Bladeless ceiling fan capable of adjusting airflow field type

11 airflow generating assembly

111 centrifugal fan

112 DC motor

12 first air flow guide

13 second airflow guide

14 flow rate regulating assembly

141 baffle plate

142 stepping motor

15 outer ring structure

16 inner ring structure

17 connecting element

18 light emitting element

A1 first region

A2 second region

F gas flow

Fa outer loop airflow

Fb inner ring air flow

FA outer annular axial flow

Annular axial air flow in FB

IN12 first air inlet

IN13 second air inlet

OUT15 outer ring air outlet

OUT16 inner ring air outlet

S airflow generation space

T12 outer ring airflow channel

T13 inner ring airflow channel

T15 outer ring channel

T16 inner ring channel

X center shaft

Detailed Description

Referring to fig. 1 and 2, fig. 1 is a perspective exploded view of a bladeless ceiling fan with adjustable airflow pattern according to a preferred embodiment of the present invention; FIG. 2 is a perspective view of the bladeless ceiling fan with adjustable airflow pattern according to the preferred embodiment of the present invention. As shown in the figure, a bladeless ceiling fan 1 with adjustable airflow pattern is hung on a ceiling plate (not shown), and comprises an airflow generating assembly 11, a first airflow guiding member 12, a second airflow guiding member 13, a flow rate regulating assembly 14, an outer ring structure 15 and an inner ring structure 16.

The airflow generating assembly 11 includes a centrifugal fan 111 and a dc motor 112, and has an airflow generating space S (shown in fig. 3). The dc motor 112 is connected to the centrifugal fan 111, and drives the centrifugal fan 111 to rotate during operation. The first airflow guiding member 12 defines an outer airflow channel T12 (shown IN fig. 3), the outer airflow channel T12 is connected to the airflow generating space S, and a first air inlet IN12 (shown IN fig. 3) is disposed between the outer airflow channel T12 and the airflow generating space S. The second airflow guiding member 13 defines an inner airflow channel T13 (shown IN fig. 3), the inner airflow channel T13 is connected to the airflow generating space S, and a second air inlet IN13 (shown IN fig. 3) is formed between the inner airflow channel T13 and the airflow generating space S.

The flow rate control assembly 14 is movably disposed adjacent to the first air inlet IN12 and the second air inlet IN13, and includes a baffle 141 and a stepper motor 142. The stepping motor 142 is connected to the baffle 141 for driving the baffle 141 to move during operation.

The outer ring structure 15 is connected to the first airflow guide 12 and defines an outer ring channel T15 (shown in fig. 4), wherein the outer ring channel T15 is communicated with the outer ring airflow channel T12. The inner ring structure 16 is connected to the second airflow guide 13 and defines an inner ring channel T16 (shown in fig. 4), wherein the inner ring channel T16 is connected to the inner ring airflow channel T13. In practice, the first airflow guide 12 is also connected to the inner ring structure 16, and the second airflow guide 13 is also connected to the outer ring structure 15, so as to enhance the structural strength of the present embodiment.

In the present embodiment, the bladeless ceiling fan 1 further includes a connecting element 17 and a light emitting element 18. The connecting element 17 is used to connect a ceiling plate (not shown) so that the bladeless ceiling fan 1 with adjustable airflow pattern can be hung in the air without occupying the space on the floor, thereby increasing the space utilization of the house. The Light-emitting device 18 is used to generate a Light source, such as a fluorescent lamp, a tungsten lamp, a Light-emitting diode (LED) or other devices capable of emitting Light. Since the bladeless ceiling fan 1 with the adjustable airflow pattern is hung on a ceiling, the light-emitting element 18 can provide a light source, so that the bladeless ceiling fan 1 with the adjustable airflow pattern has more functions.

Next, please refer to fig. 1 to 5 together, wherein fig. 3 is a cross-sectional view a-a of an application example of fig. 2; FIG. 4 is a partial cross-sectional view showing B-B of FIG. 3; and, FIG. 5 is a cross-sectional view of C-C showing an application of FIG. 2. As shown, the airflow generating assembly 11 generates an airflow F in the airflow generating space S.

In the present embodiment, the dc motor 112 of the airflow generating assembly 11 is connected to the centrifugal fan 111 of the airflow generating assembly 11, and when the dc motor 112 is operated, the centrifugal fan 111 is driven to rotate, so as to generate the airflow F. The outer annular airflow channel T12 defined by the first airflow guide 12 and the inner annular airflow channel T13 defined by the second airflow guide 13 are connected to the airflow generating space S, so that the airflow F flows from the airflow generating space S into the outer annular airflow channel T12 and the inner annular airflow channel T13.

A first air inlet IN12 is arranged between the outer annular air flow passage T12 and the air flow generating space S, and a second air inlet IN13 is arranged between the inner annular air flow passage T13 and the air flow generating space S. The air flow F flows into the outer annular air flow channel T12 through the first air inlet IN12 to form an outer annular air flow Fa, and flows into the inner annular air flow channel T13 through the second air inlet IN13 to form an inner annular air flow Fb.

The flow rate control assembly 14 is movably disposed adjacent to the first air inlet IN12 and the second air inlet IN13, and IN this embodiment, includes a baffle 141 and a stepping motor 142. The stepping motor 142 is connected to the baffle 141 and is operated to drive the baffle 141, so that the baffle 141 can move a specific angle or a specific scale to adjust a first shielding rate for shielding the first air inlet IN12 or a second shielding rate for shielding the second air inlet IN13, thereby adjusting the flow rate of the outer annular air flow Fa or the inner annular air flow Fb. IN short, the baffle 141 is used to shield the first air inlet IN12 or the second air inlet IN13, and the more the air inlets (the first air inlet IN12 and the second air inlet IN13) are shielded, the less the amount of the air flow F flows IN, and the less the air inlets are shielded, the more the amount of the air flow F flows IN.

As shown IN fig. 3 to 5, the baffle 141 does not block the first air inlet IN12, but blocks part of the second air inlet IN13, so that the first blocking ratio is smaller than the second blocking ratio, and therefore, the air flow F flows into the first air inlet IN12 more than into the second air inlet IN13, so that the flow rate of the outer annular air flow Fa is greater than that of the inner annular air flow Fb. In fig. 3, the flow rates of the outer annular flow Fa and the inner annular flow Fb are indicated by the length and the number of arrows.

The outer-ring airflow Fa flows into the outer-ring channel T15 of the outer-ring structure 15 through the outer-ring airflow channel T12, and continuously rotates in the outer-ring channel T15, so that the outer-ring airflow Fa generates a flow-increasing effect, and an outer-ring-shaped axial airflow Fa is output from an outer-ring air outlet OUT15 of the outer-ring structure 15. In practice, the flow increasing effect can increase the outer annular airflow Fa by 15 times. Similarly, the inner-ring airflow Fb flows into the inner-ring channel T16 of the inner-ring structure 16 through the inner-ring airflow channel T13, and generates a flow-increasing effect in the inner-ring channel T16, so as to output an inner-ring axial airflow Fb from an inner-ring outlet OUT16 of the inner-ring channel T16.

Because of the practical requirement of structural strength, the first airflow guide 12 is connected to the inner ring structure 16, but the outer annular airflow passage T12 is not communicated with the inner annular passage T16, so that the outer annular airflow Fa does not flow into the inner annular passage T16. Similarly, although the second airflow guide 13 is connected to the outer ring structure 15, the inner ring airflow passage T13 is not connected to the outer ring passage T15, so that the inner ring airflow Fb does not flow into the outer ring passage T15.

It should be noted that, since the outer ring structure 15 is annular, the outer ring outlet OUT15 is also annular when opened on the outer ring structure 15, and the outer ring axial airflow FA is output from the outer ring outlet OUT15, the outer ring axial airflow FA is also annular. In addition, the flow direction of the outer annular axial airflow FA is parallel to a central axis X of the bladeless ceiling fan 1 with adjustable airflow pattern. Therefore, the airflow output by the outer ring air outlet OUT15 is named as outer ring axial airflow FA. Similarly, the inner annular axial air flow FB is also the same, and therefore, the description thereof is omitted.

The outer annular flow FA forms the outer annular axial flow FA, and the inner annular flow FB forms the inner annular axial flow FB. When the flow rates of the outer annular flow Fa and the inner annular flow Fb are equal, the flow rates of the outer annular axial flow Fa and the inner annular axial flow Fb are also equal, so neither of the flows to the other. From the user's perspective, the airflow experienced by a user standing directly below the center of the bladeless ceiling fan 1 of adjustable airflow pattern (which may be considered as the central axis X) may not be as strong as standing below the outer ring structure 15 or the inner ring structure 16. The user can still feel partial airflow right below the center of the bladeless ceiling fan 1 with the adjustable airflow pattern because of the normal diffusion phenomenon of the airflow.

As shown in fig. 3 and 4, the flow rate of the outer annular airflow Fa is greater than that of the inner annular airflow Fb, so the flow rate of the outer annular axial airflow Fa is also greater than that of the inner annular axial airflow Fb, i.e. the wind speed of the outer annular axial airflow Fa is greater than that of the inner annular axial airflow Fb. Therefore, part of the outer annular axial air flow FA blows towards the inner annular axial air flow FB and merges into a concentrated air flow, i.e. a first area a1 in the drawing, as shown in fig. 5. Because the speed difference generated by the wind speed of the outer annular axial airflow FA and the wind speed of the inner annular axial airflow FB causes the whole pressure difference, the flow field is further changed, and the airflow converges to the right lower part of the center of the bladeless ceiling fan 1 with the adjustable airflow field type, so that the centralized airflow is formed.

Because of the limited space in the drawings, the flow directions of the outer annular axial flow FA and the inner annular axial flow FB in fig. 5 may be exaggerated to show the technical features of the flow converging, which is only for illustration and does not represent that the actual flow directions are necessarily shown in the drawings, and thus the description is given here.

Finally, please refer to fig. 1, fig. 2 and fig. 6 to fig. 8, wherein fig. 6 is a cross-sectional view showing a-a of another application example of fig. 2; FIG. 7 is a partial cross-sectional view showing D-D of FIG. 6; and, FIG. 8 is a cross-sectional view of C-C showing another application of FIG. 2. As shown, the airflow generating assembly 11 generates an airflow F in the airflow generating space S.

The baffle 141 is driven by the stepping motor 142 to adjust, so that the baffle 141 does not block the second air inlet IN13, but blocks part of the first air inlet IN12, so that the second blocking rate is smaller than the first blocking rate, therefore, the air flow F flows into the second air inlet IN13 more than the first air inlet IN12, and the flow rate of the inner-ring air flow Fb is greater than the flow rate of the outer-ring air flow Fa. The flow rates of the inner annular flow Fb and the outer annular flow Fa are shown by the length and the number of arrows in fig. 6.

The outer-ring airflow Fa flows into the outer-ring passage T15 of the outer-ring structure 15 through the outer-ring airflow passage T12, and generates a flow-increasing effect in the outer-ring passage T15, so as to output an outer-ring axial airflow Fa from the outer-ring air outlet OUT15 of the outer-ring structure 15. Similarly, the inner-ring airflow Fb flows into the inner-ring channel T16 of the inner-ring structure 16 through the inner-ring airflow channel T13, and generates a flow-increasing effect in the inner-ring channel T16, so as to output the inner-ring axial airflow Fb from the inner-ring outlet OUT16 of the inner-ring channel T16. The inner annular axial flow FB and the outer annular axial flow FA have been described in the previous paragraphs, and therefore are not described in detail.

As shown in fig. 6 and 7, the flow rate of the inner annular airflow Fb is greater than that of the outer annular airflow Fa, so the flow rate of the inner annular axial airflow Fb is also greater than that of the outer annular axial airflow Fa, i.e. the wind speed of the inner annular axial airflow Fb is greater than that of the outer annular axial airflow Fa. Thus, the partial inner annular axial air flow FB flows toward the outer annular axial air flow FA and merges into a divergent air flow, i.e., a second area a2 in the drawing, as shown in fig. 8. Because the speed difference generated by the wind speed of the outer annular axial airflow FA and the wind speed of the inner annular axial airflow FB causes the whole pressure difference, the flow field is further changed, and the airflow converges to the outside of the bladeless ceiling fan 1 with the adjustable airflow field type, so that the divergent airflow is formed.

Because of the limited space in the drawings, the flow directions of the outer annular axial flow FA and the inner annular axial flow FB in fig. 8 may be exaggerated to express the divergent technical features, which is only for illustration and does not represent that the actual flow directions are necessarily shown in the drawings, and thus the description is given.

Comparing the concentrated airflow with the divergent airflow, the concentrated airflow is concentrated from the outer ring structure 15 to the inner ring structure 16 with the central axis X as the center, and the divergent airflow is diverged from the inner ring structure 16 to the outer ring structure 15 with the central axis X as the center. When viewed in cross section perpendicular to the central axis X, the concentrated air flow is concentrated toward the central axis X, so that the blowing range is circular, and the divergent air flow is diverged from the inner ring structure 16 to the outer ring structure 15, so that the blowing range is hollow circular (like a donut). The blowing range refers to a range where a main airflow is blown, and a small portion of the airflow can be still sensed at a place below the bladeless ceiling fan 1 with the adjustable airflow pattern and outside the blowing range, which is a normal diffusion phenomenon of the airflow.

In summary, the bladeless ceiling fan with adjustable airflow pattern provided by the present invention can adjust the outer annular axial airflow output by the outer ring structure and the inner annular axial airflow output by the inner ring structure by matching the airflow generating assembly and the flow rate regulating assembly, so as to achieve the effect of adjusting the airflow pattern.

Compared with the electric fan in the prior art, the electric fan can be hung on a ceiling without occupying the space of a floor, so that the space utilization rate of a house is improved. Compared with the electric fan or the ceiling fan in the prior art, the invention can adjust the outer annular axial airflow output by the outer ring structure and the inner annular axial airflow output by the inner ring structure through the airflow generating assembly and the flow rate adjusting assembly, thereby achieving the effect of adjusting the airflow field pattern which cannot be achieved by the prior art, reducing the generation of noise due to no relationship of the fan blades, and avoiding various problems derived from dust adsorption of the fan blades due to static electricity.

The above detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the present invention by the preferred embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.

Claims (9)

1. A bladeless ceiling fan capable of adjusting airflow patterns is hung on a ceiling and comprises:

an airflow generating assembly for generating an airflow in the airflow generating space;

the first airflow guide piece is provided with an outer annular airflow channel communicated with the airflow generating space, and a first air inlet is arranged between the outer annular airflow channel and the airflow generating space, so that the airflow flows into the outer annular airflow channel through the first air inlet to form outer annular airflow;

the second airflow guide piece is provided with an inner ring airflow channel communicated with the airflow generating space, and a second air inlet is arranged between the inner ring airflow channel and the airflow generating space, so that the airflow flows into the inner ring airflow channel through the second air inlet to form inner ring airflow;

a flow rate control assembly movably disposed adjacent to the first air inlet and the second air inlet for adjusting at least one of a first shielding rate for shielding the first air inlet and a second shielding rate for shielding the second air inlet, so as to adjust a flow rate of at least one of the outer loop airflow and the inner loop airflow;

the outer ring structure is connected with the first airflow guide piece and is provided with an outer ring channel communicated with the outer ring airflow channel so as to enable the outer ring airflow to generate a flow increasing effect in the outer ring channel and output outer ring-shaped axial airflow; and

the inner ring structure is connected with the second airflow guide piece and is provided with an inner ring channel communicated with the inner ring airflow channel, so that the inner ring airflow generates a flow increasing effect in the inner ring channel and outputs inner ring-shaped axial airflow;

when the flow rate regulating component is movably adjusted to enable the flow rate of the outer annular airflow to be larger than that of the inner annular airflow, partial outer annular axial airflow and partial inner annular axial airflow are converged into concentrated airflow; when the flow rate regulating component is adjusted to enable the flow rate of the outer annular airflow to be smaller than that of the inner annular airflow, the outer annular axial airflow and the partial inner annular axial airflow are converged into divergent airflow.

2. The bladeless ceiling fan of claim 1, wherein the airflow generating assembly comprises a centrifugal fan, and the centrifugal fan is configured to generate the airflow.

3. The bladeless ceiling fan of claim 2, wherein the airflow generation assembly further comprises a dc motor coupled to the centrifugal fan for driving the centrifugal fan to rotate to generate the airflow.

4. The bladeless ceiling fan of claim 1, wherein the flow rate regulation component comprises a baffle, and the baffle is configured to adjust at least one of the first and second shielding rates.

5. The bladeless ceiling fan of claim 4, wherein the flow rate control assembly further comprises a stepper motor coupled to the baffle for driving the baffle to move to adjust at least one of the first and second shielding rates.

6. The adjustable airflow pattern bladeless ceiling fan of claim 1, further comprising an attachment element, and said attachment element is configured to attach to said ceiling.

7. The bladeless ceiling fan of claim 1, further comprising a light emitting device for generating a light source.

8. The bladeless ceiling fan of claim 1, wherein the outer ring structure has an outer ring outlet configured to output the outer annular axial airflow.

9. The bladeless ceiling fan of claim 1, wherein the inner ring structure is annularly provided with an inner ring air outlet configured to output the inner ring axial airflow.

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