WO2023186082A1 - Fan cover and fan - Google Patents

Abstract

A fan cover, comprising a mesh cover (1), wherein the mesh cover comprises an air output portion (10); and a flow guide ring (2), wherein at least part of the flow guide ring is arranged in the mesh cover (1), and the flow guide ring (2) comprises an air channel (20) extending in a first direction, the air channel being used for guiding air to the air output portion (10). An airflow flows out of the mesh cover (1) from the air output portion (10) after passing through the air channel (20), so as to adjust the air. By means of the fan cover, the airflow is adjusted under the action of the flow guide ring (2), so as to improve the air output effect of the fan cover. Further disclosed is a fan comprising the fan cover.

Description

Fan cover and fan

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on March 31, 2022, with the application number "202220734034.3" and the invention name "Fan Cover and Fan", the entire content of which is incorporated into this application by reference. middle.

Technical field

The present application relates to the technical field of household appliances, specifically, to a fan cover and a fan.

Background technique

At present, fan covers are mainly used to protect users from damage by fan blades. However, such fan covers not only protect users, but also have a certain impact on the appearance of the fan and air flow, making the fan's air outlet effect poor.

Contents of the invention

This application aims to solve at least one of the technical problems existing in the prior art or related technologies.

To this end, a first aspect of the present application provides a fan cover.

A second aspect of the application also provides a fan.

In view of this, the first aspect of the present application proposes a fan cover, which includes: a grille, the grille includes an air outlet; and a flow guide ring, at least a part of the flow guide ring is located in the grille, and the flow guide ring includes an edge along the The air duct extends in the first direction, and the air duct is used to guide air to the air outlet.

The fan cover provided by this application includes a grille and a guide ring. The grille is provided with an air outlet, and the airflow can flow out of the grille through the air outlet. At least a part of the flow guide ring is arranged in the grille. The flow guide ring includes an air duct. After the air flow passes through the air duct, it flows out of the air outlet to realize air conditioning. The technical solution proposed in this application allows the airflow to be adjusted under the action of the guide ring to improve the air outlet effect of the fan cover through the arrangement of the guide ring.

The air duct extends along the first direction, and under the guidance of the air duct, the airflow can flow along the first direction.

The above-mentioned fan cover provided by this application may also have the following additional technical features:

In the above technical solution, further, the air duct includes an air inlet and an air outlet, and there is an included angle between the inner wall of the air duct and the first direction.

In this technical solution, the air duct includes an air inlet and an air outlet, and the air inlet and the air outlet are distributed along the first direction. Wherein, there is an angle between the inner wall of the air duct and the first direction. In this way, when the air flow passes through the air duct, under the guidance of the first side wall, the flow direction of the air flow driven by the fan can be between the first direction and the inner wall of the air duct. With an included angle, at least the flow direction of the airflow can be adjusted, thereby improving the air outlet performance of the fan.

Further, along the first direction, the air outlet is located between the air inlet and the air outlet. That is, along the first direction, after the airflow passes through the air inlet and the air outlet in sequence, it flows out of the grille through the air outlet, and then passes through the air duct. Achieve air conditioning.

In any of the above technical solutions, further, the included angle is greater than or equal to 0° and less than or equal to 90°.

In this technical solution, if the angle between the first direction and the inner wall of the air duct is too large, it will occupy a larger space and increase the manufacturing cost. If it is small, the guiding effect of the guide ring on the air flow will be weakened. Therefore, the angle between the first direction and the inner wall of the air duct is set between 0° and 90° to ensure that the guide ring guides the air flow. Effect.

In any of the above technical solutions, further, the area of the air inlet is smaller than the area of the air outlet.

In this technical solution, the area of the air inlet is smaller than the area of the air outlet. In this way, through the setting of the air duct, the air flow can be expanded and the air outlet range can be increased to improve the air outlet performance of the fan and weaken the influence of the grille. The influence of wind.

In any of the above technical solutions, further, along the first direction, the air duct is gradually expanded to make the flow guide ring have a trumpet shape.

In this technical solution, the air duct is gradually expanded along the first direction, so that the guide ring is trumpet-shaped, that is, from the air inlet to the air outlet, the cross-sectional area of the air duct gradually increases along the first direction, and then the airflow The flow area gradually increases, which not only expands the air flow, but also ensures the stability of the air flow, thereby reducing the noise generated when the air flow passes through the air duct and improving the performance of the fan.

In any of the above technical solutions, further, the area of the air outlet is smaller than the area of the air inlet, and the air duct is gradually expanded along the second direction, and the second direction is opposite to the first direction.

In this technical solution, the area of the air outlet is smaller than the area of the air inlet. That is, along the first direction, the flow area of the air flow into the air duct is larger than the flow area of the outflow air duct, so that the air duct accelerates the air flow. , which in turn can make the air flow out of the air outlet flow to a farther place, increasing the fan's adjustment range of indoor air. The air duct is gradually expanded along the second direction, where the second direction is opposite to the first direction, that is, along the flow direction of the air flow, the cross-sectional area of the air duct gradually decreases. Under the guidance of the air duct, the air flow circulates The flow area gradually decreases, and then the flow speed of the airflow gradually increases. That is, under the guidance of the air duct, the airflow can be accelerated out of the fan cover, thereby increasing the flow distance of the airflow.

In any of the above technical solutions, further, in the cross section along the first direction, the cross section of the inner wall of the air duct is linear or curved.

In this technical solution, in the cross-section along the first direction, the cross-section of the inner wall of the air duct is linear or curved, and further, under the guidance of the inner wall of the air duct, the airflow extends linearly along the inner wall of the air duct. or curved extension.

In any of the above technical solutions, further, the flow guide ring is in an annular shape, the mesh cover is in a circular shape, and the radius of the flow guide ring is smaller than the radius of the mesh cover.

In this technical solution, the guide ring is annular and the grille is circular. The radius of the guide ring is smaller than the radius of the grille, which ensures the airflow adjustment effect.

It can be understood that the radius of the guide ring is the radius of the hollow circle enclosed by the guide ring.

In any of the above technical solutions, further, along the circumferential direction of the grille, the outer wall of the flow guide ring is connected to the inner wall of the grille.

In this technical solution, along the circumferential direction of the grille, the outer wall of the guide ring is connected to the inner wall of the grille, that is, the guide ring surrounds the inner wall of the grille. In this way, the guide ring Blocking is formed along the circumferential direction of the grille to achieve differentiation in the appearance of the fan cover.

In any of the above technical solutions, further, a hollow portion is provided on the side wall of the flow guide ring.

In this technical solution, a hollow portion is provided on the side wall of the flow guide ring, and the airflow can flow to the outside of the fan cover through the hollow portion, which reduces the obstruction to the airflow and increases the air output of the fan cover.

In any of the above technical solutions, further, the hollow portion includes at least one of a through hole and a grid.

In this technical solution, the hollow part includes a through hole, that is, a through hole is provided on the side wall of the flow guide ring, The airflow can flow out of the fan cover through the through holes, which not only breaks up the airflow and prevents the airflow from directly blowing people, but also increases the air output of the fan. The hollow part includes a grille, that is, there is a grille on the side wall of the guide ring, and the airflow can flow out of the fan cover through the gaps between the grilles, which not only ensures the air output, but also prevents the airflow from blowing directly on people, improving the airflow. No wind feeling effect.

According to the second aspect of the present application, a fan is also proposed, including: a fan cover as proposed in any of the above technical solutions.

The fan provided in the second aspect of the present application includes the fan cover proposed in any of the above technical solutions, and therefore has all the beneficial effects of the fan cover.

In any of the above technical solutions, further, the fan further includes: a casing, the fan casing is connected to the casing and encloses the accommodation cavity; the fan blades are arranged in the accommodation cavity, and the axial direction of the fan blades is arranged along the first direction, The fan blades supply air to the air outlet through the air duct.

In this technical solution, the fan also includes a casing and fan blades, and the casing is connected to the fan hood. Specifically, the casing and the fan hood enclose an accommodation cavity, and the fan blades are arranged in the accommodation cavity. Through the rotation of the fan blades, Drive airflow. Wherein, the axial direction of the fan blade is arranged along the first direction, so that the fan blade can send air into the air duct.

In any of the above technical solutions, further, the ratio of the radius of the air inlet of the air duct to the radius of the fan blade is greater than or equal to 0.8 and less than or equal to 2.

In this technical solution, if the ratio of the radius of the air inlet of the air duct to the radius of the fan blade is too small, it will not be conducive to the discharge of air flow and affect the air output of the fan. When the radius of the air inlet of the air duct and the radius of the fan blade are If the ratio is too large, the guiding effect of the guide ring on the airflow will be weakened. Specifically, the ratio of the radius of the air inlet of the air duct to the radius of the fan blade is greater than or equal to 0.8 and less than or equal to 2, which ensures both the air outlet volume and the guidance of the air flow by the air duct.

Additional aspects and advantages of the invention will be apparent from the description which follows, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

Figure 1 shows one of the partial structural schematic diagrams of a fan according to an embodiment of the present application;

Figure 2 shows the second partial structural schematic diagram of a fan according to an embodiment of the present application;

Figure 3 shows the third partial structural schematic diagram of a fan according to an embodiment of the present application;

Figure 4 shows the fourth partial structural diagram of a fan according to an embodiment of the present application.

Among them, the corresponding relationship between the reference signs and component names in Figures 1 to 4 is:

1 grille, 10 air outlet, 2 guide ring, 20 air duct, 22 air inlet, 24 air outlet, 3 fan blades.

Detailed ways

In order to understand the above-mentioned objects, features and advantages of the present application more clearly, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

Many specific details are set forth in the following description to fully understand the present application. However, the present application can also be implemented in other ways different from those described here. Therefore, the protection scope of the present application is not limited by the specific disclosures below. Limitations of Examples.

The fan cover and fan according to some embodiments of the present application are described below with reference to FIGS. 1 to 4 .

As shown in Figures 1 and 2, according to an embodiment of the present application, the present application proposes a fan cover, which includes: a grille 1 and a flow guide ring 2.

Specifically, the grille 1 includes an air outlet 10 through which the airflow can flow out of the air duct 20. At least a part of the guide ring 2 is disposed inside the grille 1 for guiding the airflow, wherein the guide ring 2 It includes an air duct 20 extending along the first direction for guiding air to the air outlet 10 .

The fan cover provided by this application includes a grille 1 and a guide ring 2. The grille 1 is provided with an air outlet 10, and the airflow can flow out of the grille 1 through the air outlet 10. At least a part of the flow guide ring 2 is arranged in the grille 1. The flow guide ring 2 includes an air duct 20. The airflow passes through the air duct 20 and then flows out of the air outlet 10 to achieve air conditioning. The embodiment proposed in this application uses the arrangement of the guide ring 2 to adjust the air flow under the action of the guide ring 2 to improve the air outlet effect of the fan cover.

The air duct 20 extends along the first direction, and under the guidance of the air duct 20, the airflow can flow along the first direction.

Furthermore, the first direction is the axis direction of the blade 3 of the fan. Specifically, the first direction is the flow direction of the airflow.

It can be understood that the fan cover can protect the user from being harmed by the fan blades 3. The fan blades 3 drive the airflow, and then the airflow flows out of the fan cover after passing through the grille 1 to adjust the indoor environment. The grille 1 is provided with There is an air outlet 10. Generally, the air outlet 10 includes a grille or a through hole. This arrangement ensures the air outlet volume while also preventing the user's fingers from being scratched by the fan blades 3 when they extend into the grille 1. , the setting of the grille 1 not only protects the user, but also affects the flow of airflow. In this application, by setting the guide ring 2, the airflow can be guided, thereby weakening the impact of the grille 1 on the airflow, and improving the air outlet of the fan cover. Effect.

In specific applications, the adjustment of the air flow by the guide ring 2 includes the adjustment of the air flow direction and the adjustment of the air flow velocity. For example, by adjusting the setting method of the air duct 20, the air flow flows in different directions, thereby realizing the air outlet in different directions, or by adjusting the setting method of the air duct 20, the flow speed of the air flow is accelerated or slowed down, thereby changing the outflow. The flow speed of the airflow of the fan cover achieves different air outlet effects, reduces the obstruction effect of the fan cover on the airflow, and improves the air outlet performance of the fan.

Further, the grille 1 and the flow guide ring 2 are of an integrated structure or a split structure.

As shown in FIG. 3 , according to an embodiment of the present application, based on the above embodiment, further: the air duct 20 includes an air inlet 22 and an air outlet 24 .

Specifically, the air inlet 22 and the air outlet 24 are distributed along a first direction, wherein an included angle is formed between the inner wall of the air duct 20 and the first direction.

In this embodiment, the air duct 20 includes an air inlet 22 and an air outlet 24 . There is an angle between the inner wall of the air duct 20 and the first direction. In this way, when the air flow passes through the air duct 20, under the guidance of the first side wall, the flow direction of the air flow driven by the fan can be aligned with the first direction. There is an included angle between them, thereby at least adjusting the flow direction of the air flow, thereby improving the air outlet performance of the fan.

It can be understood that in the cross section along the first direction, there is an included angle between the cross section of the inner wall of the air duct 20 and the first direction.

In a specific application, the first direction is set along the axis direction of the fan blade 3 .

Further, along the first direction, the air outlet 24 is provided between the air inlet 22 and the air outlet 10 . The air inlet 22 and the air outlet 24 are distributed along the first direction, and the air outlet 24 is provided between the air inlet 22 and the air outlet 10 . 10, that is, along the first direction, the airflow passes through the air inlet 22 and the air outlet 24 in sequence, then flows out of the grille 1 through the air outlet 10, and then through the air duct 20 to achieve air conditioning.

As shown in Figure 3, according to an embodiment of the present application, based on the above embodiment, Step one: the angle α between the inner wall of the air duct 20 and the first direction is greater than or equal to 0° and less than or equal to 90°.

In this embodiment, if the angle α between the first direction and the inner wall of the air duct 20 is too large, it will occupy a larger space and increase the manufacturing cost. If the included angle α is too small, the guiding effect of the guide ring 2 on the airflow will be weakened. Therefore, the included angle α between the first direction and the inner wall of the air duct 20 is set between 0° and 90° to ensure The guiding effect of the guide ring 2 on the air flow.

In a specific application, when the angle α between the first direction and the inner wall of the air duct 20 is equal to 0°, the airflow flows along the first direction under the guidance of the air duct 20 , thereby allowing the airflow to flow in a more direct direction. Remote air conditioning is achieved in remote places, improving the performance of the fan.

When the angle α between the first direction and the inner wall of the air duct 20 is greater than 0° and less than 90°, the airflow can flow along the inner wall of the air duct 20 under the guidance of the inner wall of the air duct 20 . To adjust the flow direction or air volume of the air flow.

Further, the angle α between the first direction and the inner wall of the air duct 20 is greater than 20° and less than 70°.

Further, the angle α between the first direction and the inner wall of the air duct 20 is equal to any value among 30°, 40°, 50°, 55°, and 60°.

Further, as shown in Figure 3, the included angle α between the first direction and the inner wall of the air duct 20 is equal to 55°, and the included angle between the first direction and the inner wall of the air duct 20 is set to 55°, It can not only effectively ensure the guidance effect of the airflow, but also reduce the space occupied by the guide ring 2 in the radial direction, thereby reducing the production cost, and can reduce the impact on the fan blade 3 when the size of the fan blade 3 is large. Outgoing wind resistance.

According to an embodiment of the present application, further: the fan cover includes: a grille 1 and a guide ring 2. The grille 1 includes an air outlet 10, and the airflow can flow out of the air duct 20 through the air outlet 10. The guide ring 2 At least part of it is disposed in the grille 1 for guiding the air flow, wherein the flow guide ring 2 includes an air duct 20 extending along the first direction, and the air duct 20 includes an air inlet 22 and an air outlet 24 .

Further, along the first direction, the air outlet 24 is provided between the air inlet 22 and the air outlet 10 , and an included angle α is formed between the inner wall of the air duct 20 and the first direction.

The area of the air inlet 22 is smaller than the area of the air outlet 24 .

In this embodiment, the area of the air inlet 22 is smaller than the area of the air outlet 24. In this way, through the arrangement of the air duct 20, the air flow can be expanded, thereby increasing the air outlet range, so as to improve the air outlet performance of the fan and weaken the air outlet. The influence of grille 1 on the air outlet.

In a specific application, the area of the air inlet 22 is smaller than the area of the air outlet 24. Therefore, the flow area when the air flows through the air inlet 22 is smaller than the flow area when the air flows through the air outlet 24. Since the air inlet 22 and the air outlet 24 are arranged on the air duct 20, so the airflow will expand when it flows from the air inlet 22 to the air outlet 24, thereby increasing the air outlet volume. It can be understood that when the airflow flows from the air inlet 22 to the air outlet 24 , the pressure expansion can be gradually realized from the air inlet 22 to the air outlet 24 , or the pressure expansion can be realized in a part of the air duct 20 close to the air outlet 24 .

Further, the air inlet 22 and the air outlet 24 are arranged concentrically.

As shown in FIG. 3 , according to an embodiment of the present application, based on the above embodiment, further: along the first direction, the air duct 20 is gradually expanded to make the guide ring 2 have a trumpet shape.

In this embodiment, the air duct 20 is gradually expanded along the first direction, so that the guide ring 2 is trumpet-shaped. That is, from the air inlet 22 to the air outlet 24, the cross-sectional area of the air duct 20 gradually expands along the first direction. Increase, and then the flow area of the airflow gradually increases, which not only expands the airflow, but also ensures the stability of the airflow, thereby reducing the noise generated when the airflow passes through the air duct 20, and improving the performance of the fan. .

According to an embodiment of the present application, further: the fan cover includes: a grille 1 and a guide ring 2. The grille 1 includes an air outlet 10, and the airflow can flow out of the air duct 20 through the air outlet 10. The guide ring 2 At least part of it is disposed in the grille 1 for guiding the air flow, wherein the flow guide ring 2 includes an air duct 20 extending along the first direction, and the air duct 20 includes an air inlet 22 and an air outlet 24 .

Further, along the first direction, the air outlet 24 is provided between the air inlet 22 and the air outlet 10 , and an included angle is formed between the inner wall of the air duct 20 and the first direction.

The area of the air outlet 24 is smaller than the area of the air inlet 22 .

In this embodiment, the area of the air outlet 24 is smaller than the area of the air inlet 22 , that is, along the first direction, the flow area of the airflow into the air duct 20 is larger than the flow area of the outflow air duct 20 , so that the air duct 20 is The airflow accelerates, thereby causing the airflow flowing out of the air outlet 10 to flow farther away, thereby increasing the range of indoor air regulation by the fan.

According to an embodiment of the present application, based on the above embodiment, further: along the following steps: The air duct 20 is gradually expanded in two directions, wherein the second direction is opposite to the first direction.

In this embodiment, the air duct 20 is gradually expanded along the second direction, where the second direction is opposite to the first direction, that is, along the flow direction of the air flow, the cross-sectional area of the air duct 20 gradually decreases. Under the guidance of the air duct 20, the flow area of the air flow gradually decreases, and then the flow speed of the air flow gradually increases. That is, under the guidance of the air duct 20, the air flow can be accelerated to flow out of the fan cover, thereby increasing the flow distance of the air flow.

Specifically, the first direction is the flow direction of the air flow, and the second direction is the opposite direction of the air flow.

In a specific application, when the area of the air inlet 22 is larger than the area of the air outlet 24 , the angle α between the inner wall of the air duct 20 and the second direction is greater than 0° and less than 90°. In the air inlet 22 When the area of the air outlet 24 is smaller than the area of the air outlet 24 , the angle α between the inner wall of the air duct 20 and the first direction is greater than 0° and less than 90°.

As shown in Figure 3, according to an embodiment of the present application, based on any of the above embodiments, further: in the cross section along the first direction, the cross section of the inner wall of the air duct 20 is linear or curved. .

In this embodiment, in the cross-section along the first direction, the cross-section of the inner wall of the air duct 20 is linear or curved, and under the guidance of the inner wall of the air duct 20 , the airflow flows along the inner wall of the air duct 20 Linear extension or curved extension.

In a specific application, when the cross section of the inner side wall of the air duct 20 is linear in the cross section along the first direction, it facilitates the manufacture of the guide ring 2 and reduces the production cost. In the case of a curve, the airflow guidance effect is improved.

As shown in Figures 1 and 2, according to an embodiment of the present application, on the basis of any of the above embodiments, further: the flow guide ring 2 is in the shape of an annular ring, the grille 1 is in the shape of a circle, and the flow guide ring 2 is The radius is smaller than the radius of the grille 1.

In this embodiment, the flow guide ring 2 is in the shape of an annular ring, and the grille 1 is in the shape of a circle. The radius of the flow guide ring 2 is smaller than the radius of the grille 1, which ensures the airflow adjustment effect.

It can be understood that the radius of the guide ring 2 is the radius of the hollow circle enclosed by the guide ring 2 .

According to an embodiment of the present application, based on any of the above embodiments, further: along the circumferential direction of the grille 1, the outer wall of the flow guide ring 2 is connected to the inner wall of the grille 1.

In this embodiment, along the circumferential direction of the grille 1, the outer wall of the guide ring 2 is in contact with the grille 1 The inner side walls of the fan cover are connected, that is, the flow guide ring 2 is formed around the inner side wall of the grille 1. In this way, the flow guide ring 2 forms a shield along the circumferential direction of the grille 1, thereby achieving differentiation in the appearance of the fan cover. At the same time, along the circumferential direction of the grille 1, the outer wall of the guide ring 2 is connected to the inner wall of the grille 1, which improves the reliability of the connection between the grille 1 and the guide ring 2.

Furthermore, the flow guide ring 2 and the grille 1 are integrally manufactured.

Furthermore, when the radius of the blade 3 of the fan is small, the arrangement of the guide ring 2 not only realizes the adjustment of the airflow, but also makes the appearance of the fan more beautiful and prevents the user from having trouble inside the grille 1 The visual feeling of larger gaps.

According to an embodiment of the present application, based on any of the above embodiments, further: a hollow portion is provided on the side wall of the flow guide ring 2 .

In this embodiment, a hollow portion is provided on the side wall of the flow guide ring 2, and the airflow can flow to the outside of the fan cover through the hollow portion, thereby reducing the obstruction to the airflow and increasing the air output of the fan cover.

In specific applications, the flow guide ring 2 guides the air flow through the air duct 20 to regulate the air flow. At the same time, the flow guide ring 2 is provided with a hollow part, and the air flow can also flow out of the fan cover through the hollow part, which reduces the air flow. The obstruction effect of the flow ring 2 on the air flow increases the air output of the fan.

According to an embodiment of the present application, based on the above embodiment, further: the hollow portion includes at least one of a through hole and a grid.

In this embodiment, the hollow part includes a through hole, that is, the side wall of the guide ring 2 is provided with a through hole, and the airflow can flow out of the fan cover through the through hole. This not only allows the airflow to be dispersed, but also prevents the airflow from blowing directly onto people. It can also increase the air output of the fan. The hollow part includes a grille, that is, a grille is provided on the side wall of the guide ring 2, and the airflow can flow out of the fan cover through the gaps between the grilles, which not only ensures the air output, but also prevents the airflow from blowing directly on people and improves the airflow. The windless effect.

As shown in FIGS. 1 to 4 , according to the second aspect of the present application, a fan is also provided, including: a fan cover as proposed in any of the above embodiments.

The fan provided in the second aspect of the present application includes the fan cover proposed in any of the above embodiments, and therefore has all the beneficial effects of the fan cover.

As shown in Figure 4, according to an embodiment of the present application, based on the above embodiment, further: the fan further includes a casing and a fan blade 3.

Specifically, the fan cover is connected to the casing, and the fan and the casing enclose an accommodation cavity, and the fan blades 3 is arranged in the accommodation cavity, the axial direction of the fan blade 3 is arranged along the first direction, and the fan blade 3 supplies air to the air outlet 10 through the air duct 20 .

In this embodiment, the fan also includes a casing and a fan blade 3. The casing is connected to the fan casing. Specifically, the casing and the fan casing enclose an accommodating cavity. The fan blade 3 is arranged in the accommodating cavity. Through the fan blade 3 The rotation drives the air flow. The axial direction of the fan blade 3 is arranged along the first direction, so that the fan blade 3 can send air into the air duct 20 .

In specific applications, the fan also includes a column, the cover is arranged on the column, and the fan blade 3 is movably connected to the column, so that the fan blade 3 can rotate along the axis.

According to an embodiment of the present application, based on any of the above embodiments, further: the ratio of the radius of the air inlet 22 of the air duct 20 to the radius of the fan blade 3 is greater than or equal to 0.8 and less than or equal to 2.

In this embodiment, if the ratio of the radius of the air inlet 22 of the air duct 20 to the radius of the fan blade 3 is too small, it is not conducive to the discharge of air flow and affects the air output of the fan. When the radius of the air inlet 22 of the air duct 20 is If the ratio of the radii of the fan blades 3 is too large, the airflow guiding effect of the guide ring 2 will be weakened. Specifically, the ratio of the radius of the air inlet 22 of the air duct 20 to the radius of the fan blade 3 is greater than or equal to 0.8 and less than or equal to 2, which ensures both the air outlet volume and the guidance of the air flow by the air duct 20 .

In a specific application, when the ratio of the radius of the air inlet 22 of the air duct 20 to the radius of the fan blade 3 is greater than or equal to 0.8 and less than or equal to 1, that is, the air inlet 22 of the air duct 20 is smaller than the fan blade 3 , improving the airflow guiding effect of the guide ring 2.

When the ratio of the radius of the air inlet 22 of the air duct 20 to the radius of the fan blade 3 is greater than 1 and less than or equal to 2, that is, the fan blade 3 is smaller than the air inlet 22 of the air duct 20. In this way, by setting the flow guide The ring 2 can not only adjust the air flow, but also block the gaps around the fan blade 3 in the accommodation cavity, preventing the user from visualizing a large gap in the accommodation cavity and improving the aesthetics of the fan.

Furthermore, the ratio of the radius of the air inlet 22 of the air duct 20 to the radius of the fan blade 3 is greater than 0.8 and less than 2.

Specifically, the flow guide ring 2 is in an annular shape.

Further, as shown in Figure 3, L is equal to the difference between the radius of the grille 1 and the radius of the air inlet 22 of the guide ring 2. Further, the difference between the radius of the grille 1 and the radius of the air inlet 22 of the guide ring 2 is The ratio is greater than 1 and less than or equal to 1.5. In this way, the guiding effect of the guide ring 2 on the air flow is ensured.

In this application, the term "plurality" means two or more than two, unless otherwise expressly limited. The terms "installation", "connection", "connection", "fixing", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be Directly connected, or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiments," etc., mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in the present application. in at least one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims (14)

1. A fan cover, which includes:

   A mesh cover, which includes an air outlet;

   A flow guide ring, at least a part of the flow guide ring is provided in the grille, the flow guide ring includes an air duct extending along the first direction, and the air duct is used to guide air to the air outlet.
2. The fan cover according to claim 1, wherein

   The air duct includes an air inlet and an air outlet, and an included angle is formed between an inner wall of the air duct and the first direction.
3. The fan cover according to claim 2, wherein:

   The included angle is greater than or equal to 0° and less than or equal to 90°.
4. The fan cover according to claim 2, wherein:

   The area of the air inlet is smaller than the area of the air outlet.
5. The fan cover according to claim 4, wherein

   Along the first direction, the air channel is gradually expanded to make the flow guide ring have a trumpet shape.
6. The fan cover according to claim 2, wherein:

   The area of the air outlet is smaller than the area of the air inlet;

   Along the second direction, the air duct is gradually expanded, and the second direction is opposite to the first direction.
7. The fan cover according to any one of claims 1 to 6, wherein,

   In the cross section along the first direction, the cross section of the inner wall of the air duct is linear or curved.
8. The fan cover according to any one of claims 1 to 6, wherein,

   The flow guide ring is in the shape of an annular ring, the mesh cover is in the shape of a circle, and the radius of the flow guide ring is smaller than the radius of the mesh cover.
9. The fan cover according to any one of claims 1 to 6, wherein,

   Along the circumferential direction of the grille, the outer wall of the flow guide ring is connected to the inner wall of the grille.
10. The fan cover according to any one of claims 1 to 6, wherein,

    A hollow portion is provided on the side wall of the flow guide ring.
11. The fan cover according to claim 10, wherein:

    The hollow portion includes at least one of a through hole and a grid.
12. A fan, including:

    The fan cover according to any one of claims 1 to 11.
13. The fan according to claim 12, further comprising:

    A cover, the fan cover is connected to the cover and encloses the accommodation cavity;

    A fan blade is provided in the accommodation cavity, the axial direction of the fan blade is arranged along the first direction, and the fan blade sends air to the air outlet through the air duct.
14. The fan according to claim 13, wherein,

    The ratio of the radius of the air inlet of the air duct to the radius of the fan blade is greater than or equal to 0.8 and less than or equal to 2.