CN219865578U

CN219865578U - Centrifugal fan and air conditioner

Info

Publication number: CN219865578U
Application number: CN202123051743.6U
Authority: CN
Inventors: 刘宏宝; 王永涛; 王晓刚; 张鹏
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2023-10-20
Anticipated expiration: 2031-12-07

Abstract

The utility model provides a centrifugal fan and an air conditioner, wherein the centrifugal fan comprises a wind wheel, and the wind wheel comprises a wheel disc, a plurality of blades and wind guide ribs. The middle part of the wheel disc protrudes to form a wheel hub. The plurality of blades set up in the border of rim plate, and a plurality of blades set up along wheel hub's circumference interval. The wind-guiding rib stretches out from the periphery wall of the hub towards the edge of the wheel disc, and in the direction in which the wind-guiding rib stretches out, the wind-guiding rib is spaced from the blades. When the centrifugal fan works, the wind-guiding rib drives the air flow between the hub and the blades to rotate, so that the air flow between the hub and the blades is more uniform, and the air flow between the hub and the blades is full and uniform. The flow state of the air flow is effectively improved, the turbulent flow state of the air flow is reduced, and the backflow of the air flow and the vortex of the air flow at the local position of the blade are avoided. The vortex noise and the reflux noise can be obviously reduced, and the function of reducing the noise of the centrifugal machine is achieved.

Description

Centrifugal fan and air conditioner

Technical Field

The utility model relates to the field of air conditioners, in particular to a centrifugal fan and an air conditioner.

Background

The conventional centrifugal fan can change the flow direction of the fluid medium from the axial direction to the circumferential direction, and has many advantages, so that the conventional centrifugal fan is adopted in the fresh air system of the existing household air conditioner under normal conditions. On the premise of meeting the performance requirement of a fresh air system of an air conditioner, the noise of the traditional centrifugal fan is serious. Noise brings much trouble to people and affects the work and life of people, so the disadvantage of high noise of the traditional centrifugal fan is more unacceptable. At present, in order to create a good living and working environment for people, the requirements of household electrical appliances on noise are becoming strict.

Disclosure of Invention

An object of the present utility model is to provide a centrifugal fan and an air conditioner, which are used for solving the above technical problems.

In particular, the present utility model provides a centrifugal fan comprising a rotor comprising:

the middle part of the wheel disc protrudes to form a wheel hub;

the blades are arranged at the edge of the wheel disc and are arranged at intervals along the circumferential direction of the wheel hub;

the wind-guiding rib extends from the peripheral wall of the hub towards the edge of the wheel disc, and in the extending direction of the wind-guiding rib, the wind-guiding rib is spaced from the blades.

Optionally, the length of the wind-guiding rib along the extending direction is 0.17 to 0.21 times of the diameter of the wheel disc.

Optionally, the dimension of the wind-guiding rib along the protruding direction of the hub is 0.5 times to 0.7 times that of the blade along the protruding direction of the hub.

Optionally, an included angle between a line from the center of the wheel disc to an intersection point of the wind-guiding rib and the wheel hub and the wind-guiding rib at the intersection point is in a range of 30 ° to 36 °.

Optionally, the bending center of the blade and the bending center of the wind guide rib adjacent to the blade are on the same side.

Optionally, the radius of curvature of the wind-guiding rib is greater than or equal to 31 mm.

Optionally, the radius of curvature of the blade is smaller than the radius of curvature of the wind-guiding rib.

Optionally, the number of the wind-guiding ribs ranges from 10 to 16, and the plurality of wind-guiding ribs are uniformly arranged at intervals along the circumferential direction of the peripheral wall of the hub.

Optionally, the centrifugal fan further comprises:

the shell, its cavity is used for holding the wind wheel to set up air intake and air outlet along the both sides of a diameter of rim plate.

According to a second aspect of the present utility model, there is also provided an air conditioner comprising a centrifugal fan as any one of the above.

The utility model provides a centrifugal fan and an air conditioner, wherein the centrifugal fan comprises a wind wheel, and the wind wheel comprises a wheel disc, a plurality of blades and wind guide ribs. The middle part of the wheel disc protrudes to form a wheel hub. The plurality of blades set up in the border of rim plate, and a plurality of blades set up along wheel hub's circumference interval. The wind-guiding rib stretches out from the periphery wall of the hub towards the edge of the wheel disc, and in the direction in which the wind-guiding rib stretches out, the wind-guiding rib is spaced from the blades. When the centrifugal fan works, the wind-guiding rib drives the air flow between the hub and the blades to rotate, so that the air flow between the hub and the blades is more uniform, and the air flow between the hub and the blades is full. The flow state of the air flow is effectively improved, the turbulent flow state of the air flow is reduced, and the backflow of the air flow and the vortex of the air flow at the local position of the blade are avoided. The vortex noise and the reflux noise can be obviously reduced, and the function of reducing the noise of the centrifugal machine is achieved.

The above, as well as additional objectives, advantages, and features of the present utility model will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present utility model when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic view of a wind turbine according to an embodiment of the utility model;

FIG. 2 is a schematic view of a wind turbine according to an embodiment of the utility model;

FIG. 3 is an exploded view of a centrifugal fan according to one embodiment of the utility model;

FIG. 4 is a schematic view of a perspective of a centrifugal fan according to an embodiment of the utility model;

FIG. 5 is a schematic view of a perspective of a centrifugal fan according to an embodiment of the utility model;

FIG. 6 is a schematic view of a conventional centrifugal fan at one viewing angle;

fig. 7 is a schematic view of a conventional centrifugal fan at one view angle.

Detailed Description

FIG. 1 is a schematic view of a wind turbine according to an embodiment of the utility model; FIG. 2 is a schematic view of a wind turbine according to an embodiment of the utility model; FIG. 3 is an exploded view of a centrifugal fan according to one embodiment of the utility model; FIG. 4 is a schematic view of a perspective of a centrifugal fan according to an embodiment of the utility model; FIG. 5 is a schematic view of a perspective of a centrifugal fan according to an embodiment of the utility model; FIG. 6 is a schematic view of a conventional centrifugal fan at one viewing angle; fig. 7 is a schematic view of a conventional centrifugal fan at one view angle.

On the premise of meeting the performance requirement of a fresh air system of an air conditioner, the noise of the traditional centrifugal fan is serious. Noise can bring much trouble to people and influence the work and life of people. In order to create a good living and working environment for people, the requirements of household appliances on noise are becoming strict. The inventor analysis shows that the main reasons for the noise comparison of the traditional centrifugal fan are two aspects, specifically described as follows:

first aspect: the airflow is deflected in the direction of the blades after contacting the hub, as shown in fig. 7, the hub in the conventional centrifugal fan is a smooth curved surface, which causes uneven transition between the hub flow field and the blade flow field. In other words, this causes non-uniformity in the flow field portion between the hub and the blades, which results in turbulence of the fluid. That is, this may result in turbulence and backflow of the fluid medium, which may increase broadband noise of the conventional centrifugal fan, thereby causing a rise in overall noise of the conventional centrifugal fan.

Second aspect: when the air flow reaches the blades from the hub, the direction of the air flow is different from the tangential direction of the wing profile of the blades, which also increases the noise of the conventional centrifugal fan.

In the present embodiment, as shown in fig. 3 to 5, the centrifugal fan 10 of the present embodiment mainly includes a housing 200 and a wind wheel 100. The housing 200 has a cavity, an air inlet 220 and an air outlet 210, and the wind wheel 100 is accommodated in the cavity of the housing 200. The air inlet 220 and the air outlet 210 are respectively disposed on two sides of a diameter of the wind wheel 100, or it is understood that the air inlet 220 and the air outlet 210 are respectively disposed on two opposite sides of the housing 200. As shown in fig. 3 to 5, if the air outlet 210 is formed at the top of the housing 200, the air inlet 220 is formed at the bottom of the housing 200. It should be apparent that the locations at which the air inlet 220 and the air outlet 210 of the housing 200 are opened are merely exemplary and not exclusive.

As a specific embodiment, as shown in fig. 1 to 2, the centrifugal fan 10 provided in this embodiment includes a wind wheel 100, where the wind wheel 100 includes a wheel disc 110, a plurality of blades 120, and wind guide ribs 130. The middle portion of the wheel disc 110 protrudes to form a hub 111. The blades 120 are disposed at the edge of the disk 110, and the blades 120 are disposed at intervals along the circumference of the hub 111. The wind-guiding rib 130 protrudes from the outer circumferential wall of the hub 111 toward the rim of the wheel disc 110, and in the direction in which the wind-guiding rib 130 protrudes, the wind-guiding rib 130 is spaced 150 from the blade 120.

The shape of the body of the wheel 110 may be selected according to need, and in this embodiment, as shown in fig. 1 and 2, the middle portion of the wheel 110 protrudes to form the hub 111, so that the wheel 110 is a three-dimensional structure, but the shape of the body of the wheel 110 is circular, or it is understood that the shape of the hub after being orthographically projected on the wheel is circular.

The central portion of the wheel 110 protrudes to form the hub 111, the central portion of the wheel 110 is a generalized concept, the central portion of the wheel 110 is opposite to the edge of the wheel 110, and the central portion of the wheel 110 is not necessarily the center of the wheel 110. In this embodiment, as shown in fig. 1 and 2, the middle portion of the wheel disc 110 refers to the center position of the wheel disc 110, and the center position of the wheel disc 110 protrudes to form a cylindrical hub 111. It will be apparent that this is by way of example only and not by way of example only.

The hub 111 is used for rotating under the driving of the driving device, and the hub 111 drives the blades 120 on the wheel disc 110 and the wind guide ribs 130 on the hub 111 to rotate so as to realize air supply. The specific type of the driving device is not limited, for example, the driving device mainly includes a motor, and an output shaft of the motor is fixedly connected with the hub 111 to drive the hub 111 to rotate.

The blades 120 are disposed at the edge of the disk 110, and the blades 120 are disposed at intervals along the circumference of the hub 111. The number of the blades 120 is not limited and may be selected as desired. In this embodiment, the rim of the wheel disc 110 is a broad concept, the rim of the wheel disc 110 is an area opposite to the middle of the wheel disc 110, and the rim of the wheel disc 110 is not just the end of the wheel disc 110 or the rim near the end of the wheel disc 110. In this embodiment, the rim of the disk 110 refers to the area near the end of the disk 110, or it is understood that one end of the blade 120 is flush with the disk 110 and the other end of the blade 120 is oriented toward the middle of the disk.

The spacing distance between the plurality of blades 120 along the hub 111 may be selected as required, and in this embodiment, the plurality of blades 120 are uniformly spaced. The plurality of blades 120 are arranged in the circumferential direction of the hub 111, i.e. the plurality of blades 120 are arranged around the hub 111, or it is understood that the plurality of blades 120 are arranged around the hub 111. In this embodiment, the body shape of the disk 110 is circular, and the plurality of blades 120 are also uniformly spaced along the rim of the disk 110. The arrangement manner of the plurality of blades 120 on the wheel disc 110 may be selected according to needs, and in this embodiment, an annular impeller 140 is disposed on the wheel disc 110, the impeller 140 is disposed coaxially with the hub 111, and the impeller 140 is die-cut to form the plurality of blades 120.

The wind-guiding rib 130 protrudes from the outer circumferential wall of the hub 111 toward the rim of the wheel disc 110, and in the direction in which the wind-guiding rib 130 protrudes, the wind-guiding rib 130 is spaced 150 from the blade 120. The material, shape, etc. of the air guide rib 130 may be selected as desired. In this embodiment, the air guiding rib 130 is arc-shaped, that is, the air guiding rib 130 is not flat, and the air guiding rib 130 has a certain arc.

The location, the arrangement manner, etc. of the wind-guiding rib 130 on the hub 111 may be selected according to the need, and in this embodiment, the wind-guiding rib 130 does not extend along the radial direction of the hub 111, and the wind-guiding rib 130 has a certain inclination with respect to the radial direction of the hub 111. In the present embodiment, the number of the wind-guiding ribs 130 is plural, and the plurality of wind-guiding ribs 130 are uniformly arranged at intervals along the circumferential direction of the hub 111.

The wind-guiding rib 130 protrudes toward the rim of the wheel disc 110, i.e., the wind-guiding rib 130 protrudes toward the direction of the blade 120, and the wind-guiding rib 130 protrudes toward the outside of the hub 111. In the direction in which the wind-guiding rib 130 protrudes, there is a space 150 between the wind-guiding rib 130 and the blade 120, i.e. there is a space 150 between the end of the wind-guiding rib 130 remote from the hub 111 and the end of the blade 120 remote from the rim of the wheel disc 110. Alternatively, it is understood that the end of the wind-guiding rib 130 away from the hub 111 is not in contact with the end of the blade 120 away from the rim of the disk 110, and that there is no structural interference between the end of the wind-guiding rib 130 away from the hub 111 and the end of the blade 120 away from the rim of the disk 110.

When the centrifugal fan 10 works, the hub 111 drives the wind-guiding rib 130, the blades 120 and the wheel disc 110 to rotate, the wind-guiding rib 130 drives the air flow between the hub 111 and the blades 120 to rotate in advance, the wind-guiding rib 130 enables the air flow between the hub 111 and the blades 120 to be more uniform, and the wind-guiding rib 130 enables the air flow to be full and full between the hub 111 and the blades 120. This effectively improves the flow conditions of the airflow, reduces the turbulence conditions of the airflow, and avoids backflow of the airflow and turbulence of the airflow at local positions of the blades 120. The vortex noise and the reflux noise can be obviously reduced, and the function of reducing the noise of the centrifugal machine is achieved.

According to the simulation diagram of the conventional centrifugal fan and the simulation diagram of the centrifugal fan 10 provided by the embodiment of the utility model, in the simulation diagram, the air flow in the blue area is low-speed air flow, the air flow in the cyan area is medium-low-speed air flow, and the air flow in the red-yellow area is medium-high-speed air flow. It is apparent that the hub 111 in the conventional centrifugal fan does not have the wind-guiding ribs 130, and the air flow between the hub 111 and the blades 120 in the conventional centrifugal fan is not uniformly distributed and is not full. According to the centrifugal fan 10 provided by the embodiment of the utility model, the hub 111 in the centrifugal fan 10 is provided with the wind guide ribs 130, the air flow velocity between the hub 111 and the blades 120 in the centrifugal fan 10 is distributed uniformly, and the air flow is plump.

Acoustic power cloud for a conventional centrifugal fan and acoustic power cloud for centrifugal fan 10 according to one embodiment of the utility model. As can be seen from the figure, the maximum noise value of the centrifugal fan 10 according to one embodiment of the present utility model is reduced from 46dB to 44.4dB by 1.6dB by 3.5%.

The above experimental data indicate that the air guide ribs 130 in the centrifugal fan 10 provided in this embodiment effectively improve the flowing state of the air flow, the air guide ribs 130 reduce the turbulence of the air flow, and the air guide ribs 130 avoid the backflow of the air flow and the vortex of the air flow at the local positions of the blades 120. The vortex noise and the reflux noise can be obviously reduced, and the function of reducing the noise of the centrifugal machine is achieved.

Therefore, when the centrifugal fan 10 works, the wind-guiding ribs 130 drive the air flow between the hub 111 and the blades 120 to rotate, the air flow between the hub 111 and the blades 120 is more uniform by the wind-guiding ribs 130, and the air flow between the hub 111 and the blades 120 is full and uniform. This effectively improves the flow conditions of the airflow, reduces the turbulence conditions of the airflow, and avoids backflow of the airflow and turbulence of the airflow at local positions of the blades 120. The vortex noise and the reflux noise can be obviously reduced, and the function of reducing the noise of the centrifugal machine is achieved.

In other embodiments, the line 160 from the center of the wheel disc 110 to the intersection of the wind-guiding rib 130 with the hub 111 may be in the range of 30 ° to 36 ° from the wind-guiding rib 130 at the intersection. As shown in fig. 2, in this embodiment, the body of the wheel disc 110 is circular in shape, or the pattern formed after the hub 111 is orthographically projected on the wheel disc 110 is circular. Since the central portion of the wheel disc 110 protrudes to form the hub 111, the wheel disc 110 is a three-dimensional structure, and the center of the wheel disc 110 is the axis of the hub 111. The wind-guiding rib 130 is also intersected with the hub 111 to form a line, which is simply called an intersecting line. The axis forms a plane to the intersection line, and the angle between the wind-guiding rib 130 and the plane at the intersection line ranges from 30 ° to 36 °. For convenience of description, in this embodiment, the center of the wheel disc 110 is the center of a graph formed by orthographic projection of the wheel hub 111 on the wheel disc 110, and the intersection point of the wind-guiding rib 130 and the wheel hub 111 is the orthographic projection point of the intersection line of the wind-guiding rib 130 and the wheel hub 111 on the wheel disc 110, which is simply called the intersection point. The intersection point and the central line 160 form two angles with the wind-guiding rib 130 at the intersection point, an acute angle and an obtuse angle, the acute angle being in the range of 30 ° to 36 °.

It can be seen that when the inclination angle of the wind-guiding rib 130 is in the range of 30 ° to 36 °, the airflow passes through the pre-rotation of the wind-guiding rib 130, and the airflow direction approaches the tangential direction of the airfoil of the blade 120. This further reduces the noise of the centrifugal fan 10.

In other embodiments, the center of curvature of the blade 120 is on the same side as the center of curvature of the adjacent wind deflector 130. As a specific example, the wind-guiding rib 130 near the connection line 160 and the bending center of the blade 120 near the connection line 160 are both on the connection line 160 side. Alternatively, it will be understood that, taking the orientation of fig. 2 as an example, the bending center of the top blade 120 and the bending center of the top wind-guiding rib 130 are both on the left side, that is, the bending center of the blade 120 and the bending center of the wind-guiding rib 130 adjacent thereto are both on the same side. Alternatively, it is understood that the bending directions of the blades 120 and the wind-guiding ribs 130 are identical.

It can be seen that the bending center of the blade 120 and the bending center of the adjacent wind-guiding rib 130 are on the same side, that is, the bending directions of the blade 120 and the adjacent wind-guiding rib 130 are identical. The air flow passes through the pre-rotation of the wind-guiding rib 130, and the flow direction of the air flow approaches to the tangential direction of the wing profile of the blade 120, which further reduces the noise of the centrifugal fan 10.

In other embodiments, the radius of curvature of the wind-guiding rib 130 is greater than or equal to 31 mm, and when the wind-guiding rib 130 is at a limit, the shape of the wind-guiding rib 130 is planar. When the radius of curvature of the air guide rib 130 is greater than or equal to 31 mm, the air guide effect of the air guide rib 130 is relatively good. Also, such ribs 130 allow the airflow to flow closer to the tangential direction of the airfoil of the blade 120, which further reduces the noise of the centrifugal fan 10.

Therefore, when the radius of curvature of the wind-guiding rib 130 is 31 mm or more, the wind-guiding effect of the wind-guiding rib 130 is relatively good. Also, such ribs 130 allow the airflow to flow closer to the tangential direction of the airfoil of the blade 120, which further reduces the noise of the centrifugal fan 10.

In other embodiments, the radius of curvature of the blade 120 is smaller than the radius of curvature of the wind-guiding rib 130, i.e., the degree of curvature of the blade 120 is greater than the degree of curvature of the wind-guiding rib 130. The wind guide rib 130 has a good wind guide effect. And, such wind-guiding ribs 130 make the flow direction of the air flow close to the tangential direction of the airfoil profile of the blade 120, and the speed direction and the size of the air flow close to the speed direction and the size of the blade 120, which further reduces the noise of the centrifugal fan 10.

In other embodiments, the length of the wind-guiding rib 130 in the extending direction thereof is 0.17 to 0.21 times the diameter of the wheel disc 110. That is, the size of the wind-guiding rib 130 in the extending direction thereof is 0.17 to 0.21 times the diameter of the wheel disc 110, and the wind-guiding rib 130 of this size has a good wind-guiding effect.

In other embodiments, the dimension of the wind-guiding rib 130 along the protruding direction of the hub 111 is 0.5 to 0.7 times the dimension of the blade 120 along the protruding direction of the hub 111. That is, the length of the wind-guiding rib 130 is 0.5 to 0.7 times the length of the hub 111 along the protruding direction of the hub 111, and the wind-guiding rib 130 with such a size has a good wind-guiding effect.

In other embodiments, the number of the wind-guiding ribs 130 ranges from 10 to 16, and the plurality of wind-guiding ribs 130 are uniformly arranged at intervals along the outer peripheral wall of the hub 111. This number of ribs 130 provides a relatively uniform flow of air between the hub 111 and the blades 120.

In other embodiments, the centrifugal fan 10 further includes a housing 200, and a cavity of the housing 200 is used to house the wind wheel 100, and an air inlet 220 and an air outlet 210 are formed along two sides of one diameter of the wheel 110. The air inlet 220 and the air outlet 210 are respectively disposed on two sides of a diameter of the wind wheel 100, or it is understood that the air inlet 220 and the air outlet 210 are respectively disposed on two opposite sides of the housing 200. In the above-mentioned figures, as shown in fig. 3 to 5, if the air outlet 210 is formed at the top of the housing 200, the air inlet 220 is formed at the bottom of the housing 200. It should be apparent that the locations at which the air inlet 220 and the air outlet 210 of the housing 200 are opened are merely exemplary and not exclusive.

According to a second aspect of the present utility model, there is also provided an air conditioner comprising a centrifugal fan 10 according to any one of the above. Since the air conditioner includes the centrifugal fan 10 according to any one of the above, the air conditioner has the advantage of the centrifugal fan 10 according to any one of the above, and will not be described in detail herein.

The specific type of the air conditioner can be selected according to the needs, and in this embodiment, the air conditioner is a fresh air conditioner (not shown in the figure). The fresh air conditioner includes a centrifugal fan 10 of the present embodiment in addition to an indoor unit (not shown) having the same appearance and performance as those of the prior art.

The centrifugal fan 10 is arranged at the end part of the casing of the indoor unit and is positioned in the casing to be integrated with the original indoor unit of the air conditioner, and the centrifugal fan 10 cannot be exposed outside the indoor unit, so that the aesthetic feeling of the appearance is maintained, and the space for installing the indoor unit is saved. The air inlet 220 of the centrifugal fan 10 is used for being connected with a fresh air inlet pipe leading to the outside, and the air outlet 210 of the centrifugal fan 10 faces the top of the machine shell. That is, the air inlet 220 of the centrifugal fan 10 draws in fresh air from outside, and the air outlet 210 of the centrifugal fan is air-out toward the top of the cabinet. The centrifugal fan 10 continuously delivers outdoor fresh air to the indoor space.

Therefore, the centrifugal fan 10 is newly added on the indoor unit of the traditional air conditioner, so that in the refrigerating or heating process of the air conditioner, even if the window is closed, the centrifugal fan 10 can introduce outdoor air into the room, and the centrifugal fan 10 provides continuous and fresh air for the closed indoor space, thereby increasing the oxygen content of the indoor air and avoiding air conditioning diseases.

In the description of the present embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature, i.e. one or more such features. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. When a feature "comprises or includes" a feature or some of its coverage, this indicates that other features are not excluded and may further include other features, unless expressly stated otherwise.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," "coupled," and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. Those of ordinary skill in the art will understand the specific meaning of the terms described above in the present utility model as the case may be.

Furthermore, in the description of the present embodiments, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature therebetween. That is, in the description of the present embodiment, the first feature being "above", "over" and "upper" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature "under", "beneath", or "under" a second feature may be a first feature directly under or diagonally under the second feature, or simply indicate that the first feature is less level than the second feature.

Unless otherwise defined, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.

In the description of the present embodiment, a description referring to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the utility model have been shown and described herein in detail, many other variations or modifications of the utility model consistent with the principles of the utility model may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the utility model. Accordingly, the scope of the present utility model should be understood and deemed to cover all such other variations or modifications.

Claims

1. A centrifugal fan comprising a wind wheel, the wind wheel comprising:

the middle part of the wheel disc protrudes to form a wheel hub;

and the wind guide rib extends from the outer Zhou Bichao of the hub to the edge of the wheel disc, and is spaced from the blade in the extending direction of the wind guide rib, wherein the dimension of the wind guide rib along the protruding direction of the hub is 0.5 to 0.7 times that of the blade along the protruding direction of the hub.

2. The centrifugal fan according to claim 1, wherein,

the length of the wind guide rib along the extending direction is 0.17 to 0.21 times of the diameter of the wheel disc.

3. The centrifugal fan according to claim 1, wherein,

the included angle between the connecting line from the center of the wheel disc to the intersection point of the wind guide rib and the wheel hub and the wind guide rib at the intersection point is 30-36 degrees.

4. The centrifugal fan according to claim 1, wherein,

the bending center of the blade and the bending center of the wind guide rib adjacent to the blade are on the same side.

5. The centrifugal fan according to claim 4, wherein,

the curvature radius of the wind guide rib is more than or equal to 31 mm.

6. The centrifugal fan according to claim 4, wherein,

the curvature radius of the blade is smaller than that of the wind guide rib.

7. The centrifugal fan according to claim 1, wherein,

the number range of the wind guide ribs is 10 to 16, and a plurality of wind guide ribs are uniformly arranged along the circumferential interval of the peripheral wall of the hub.

8. The centrifugal fan of claim 1, further comprising:

and the cavity of the shell is used for accommodating the wind wheel, and an air inlet and an air outlet are formed along two sides of one diameter of the wheel disc.

9. An air conditioner comprising the centrifugal fan according to any one of claims 1 to 8.