CN114673684A

CN114673684A - Centrifugal fan and air conditioner

Info

Publication number: CN114673684A
Application number: CN202111486166.5A
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: 2022-06-28

Abstract

The invention 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 a wind guiding rib. The middle part of the wheel disc is protruded to form a hub. A plurality of blades set up in the border of rim plate, and a plurality of blades set up along the circumference interval of wheel hub. The wind-guiding muscle stretches out towards the border of rim plate from wheel hub's periphery wall to, at the direction that the wind-guiding muscle stretches out, there is the interval in wind-guiding muscle and blade. When the centrifugal fan works, the air guide ribs drive the air flow between the hub and the blades to rotate, the air guide ribs enable the air flow between the hub and the blades to be more uniform, and the air flow between the hub and the blades is filled more fully and uniformly. The flow state of the airflow is effectively improved, the turbulent flow state of the airflow is reduced, and the backflow of the airflow and the vortex of the airflow at the local position of the blade are avoided. The method can obviously reduce vortex noise and backflow noise and achieve the function of reducing noise of the centrifuge.

Description

Centrifugal fan and air conditioner

Technical Field

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

Background

Traditional centrifugal fan can change fluid medium's flow direction into circumference by the axial, and traditional centrifugal fan has a lot of advantages, consequently, under the normal conditions, current domestic air conditioner's new trend system all adopts traditional centrifugal fan. On the premise of meeting the performance requirement of a fresh air system of an air conditioner, the traditional centrifugal fan has serious noise. The noise brings much trouble to people and influences the work and life of people, so that the noise of the traditional centrifugal fan is more unacceptable. At present, the requirements of household electrical appliances on noise are becoming stricter for creating a good living and working environment for people.

Disclosure of Invention

An object of the present invention is to provide a centrifugal fan and an air conditioner, which are used to solve the above technical problems.

In particular, the present invention provides a centrifugal fan comprising a wind wheel comprising:

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

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

the wind guiding rib stretches out from the periphery wall of wheel hub towards the border of rim plate to, at the direction that the wind guiding rib stretches out, there is the interval in wind guiding rib and blade.

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 size of the wind guiding rib along the hub protruding direction is 0.5 to 0.7 times the size of the blade along the hub protruding direction.

Optionally, an included angle between a connecting 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 centre of curvature of the blade and the centre of curvature of the air conductor adjacent thereto are on the same side.

Optionally, the radius of curvature of the air guide rib is equal to or greater than 31 mm.

Optionally, the radius of curvature of the blade is smaller than the radius of curvature of the air guide bar.

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

Optionally, the centrifugal fan further comprises:

the wind wheel is arranged in the cavity of the shell, and an air inlet and an air outlet are formed in the two sides of one diameter of the wheel disc.

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

The invention 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 a wind guiding rib. The middle part of the wheel disc is protruded to form a hub. A plurality of blades set up in the border of rim plate, and a plurality of blades set up along the circumference interval of wheel hub. The wind-guiding muscle stretches out towards the border of rim plate from wheel hub's periphery wall to, at the direction that the wind-guiding muscle stretches out, there is the interval in wind-guiding muscle and blade. When the centrifugal fan works, the air guide ribs drive the air flow between the hub and the blades to rotate, the air guide ribs enable the air flow between the hub and the blades to be more uniform, and the air flow between the hub and the blades is more full. The flow state of the airflow is effectively improved, the turbulent flow state of the airflow is reduced, and the backflow of the airflow and the vortex of the airflow at the local position of the blade are avoided. The method can obviously reduce vortex noise and backflow noise and achieve the function of reducing noise of the centrifuge.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

figure 1 is a schematic view of a perspective of a wind rotor according to an embodiment of the invention;

figure 2 is a schematic view of a perspective of a wind rotor according to an embodiment of the invention;

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

FIG. 4 is a schematic view of one perspective of a centrifugal fan according to one embodiment of the present invention;

FIG. 5 is a schematic view of one perspective of a centrifugal fan according to one embodiment of the present invention;

FIG. 6 is a schematic view of one perspective of a conventional centrifugal fan;

FIG. 7 is a schematic view of one perspective of a conventional centrifugal fan;

FIG. 8 is a simulated graph of a conventional centrifugal fan with respect to the velocity vector of a fluid;

FIG. 9 is a simulated view of a centrifugal fan according to one embodiment of the present invention with respect to fluid velocity vectors;

FIG. 10 is an acoustic power cloud of a conventional centrifugal fan;

FIG. 11 is an acoustic power cloud of a centrifugal fan according to one embodiment of the invention.

Detailed Description

Figure 1 is a schematic view of a perspective of a wind rotor according to an embodiment of the invention; figure 2 is a schematic view of a perspective of a wind rotor according to an embodiment of the invention; FIG. 3 is an exploded view of a centrifugal fan according to one embodiment of the present invention; FIG. 4 is a schematic view of one perspective of a centrifugal fan according to one embodiment of the present invention; FIG. 5 is a schematic view of one perspective of a centrifugal fan according to one embodiment of the present invention; FIG. 6 is a schematic view of one perspective of a conventional centrifugal fan; FIG. 7 is a schematic view of one perspective of a conventional centrifugal fan; FIG. 8 is a simulated graph of velocity vectors of fluid in a conventional centrifugal fan; FIG. 9 is a simulated graph of fluid velocity vectors in a centrifugal fan according to one embodiment of the invention; FIG. 10 is an acoustic power cloud of a conventional centrifugal fan; FIG. 11 is an acoustic power cloud of a centrifugal fan according to one embodiment of the invention.

On the premise of meeting the performance requirement of a fresh air system of an air conditioner, the traditional centrifugal fan has serious noise. The noise brings much trouble to people and influences the work and life of people. In order to create a good living and working environment for people, the requirements of household electrical appliances on noise are becoming stricter. The inventor analyzes that the main reasons for the noise of the conventional centrifugal fan are as follows:

in a first aspect: the air flow is deflected towards the direction of the blade after contacting the hub, as shown in fig. 7 and 8, 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 a partial non-uniformity of the flow field between the hub and the blades, which results in a turbulent flow of the fluid. That is, this may cause a vortex and backflow of the fluid medium, which may increase the broadband noise of the conventional centrifugal fan, thereby causing a rise in the overall noise of the conventional centrifugal fan.

In a second aspect: when the airflow reaches the blade from the hub, the airflow direction is different from the tangential direction of the airfoil of the blade, which also increases the noise of the traditional centrifugal fan.

In the present embodiment, as shown in fig. 3 to 5, the centrifugal fan 10 of the present embodiment mainly includes a casing 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 opened at two sides of one diameter of the wind wheel 100, or it is understood that the air inlet 220 and the air outlet 210 are respectively opened at two opposite sides of the housing 200. As shown in fig. 3 to 5, if the air outlet 210 is opened at the top of the housing 200, the air inlet 220 is opened at the bottom of the housing 200. It is obvious that the positions where the air inlet 220 and the air outlet 210 of the housing 200 are opened are merely exemplary and not exclusive.

As a specific example, as shown in fig. 1 to 2, the centrifugal fan 10 provided in this embodiment includes a wind wheel 100, and the wind wheel 100 includes a wheel disc 110, a plurality of blades 120, and wind guiding ribs 130. The center of the disk 110 is bulged to form a hub 111. The plurality of blades 120 are disposed at the edge of the disk 110, and the plurality of blades 120 are disposed at intervals in the circumferential direction of the hub 111. The air-guiding ribs 130 extend from the outer peripheral wall of the hub 111 toward the edge of the disk 110, and the air-guiding ribs 130 are spaced 150 apart from the blades 120 in the direction in which the air-guiding ribs 130 extend.

The shape of the main body of the wheel disc 110 can be selected as required, and in this embodiment, as shown in fig. 1 and 2, the central portion of the wheel disc 110 is protruded to form the hub 111, so that the wheel disc 110 has a three-dimensional structure, but the main body of the wheel disc 110 is circular, or it can be understood that the shape of the hub after being orthographically projected on the wheel disc is circular.

The center of the wheel disc 110 is projected to form the hub 111, the center of the wheel disc 110 is a broad concept, the center of the wheel disc 110 is with respect to the edge of the wheel disc 110, and the center of the wheel disc 110 is not necessarily the center of the wheel disc 110. In the present embodiment, as shown in fig. 1 and 2, the middle portion of the disc 110 refers to the center position of the disc 110, and the center position of the disc 110 is projected to form a cylindrical hub 111. It will be apparent that this is merely exemplary and not exclusive.

The hub 111 is driven by the driving device to rotate, and the hub 111 drives the blades 120 on the wheel disc 110 and the air guiding ribs 130 on the hub 111 to rotate, so as to achieve air blowing. 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 wheel hub 111 to drive the wheel hub 111 to rotate.

The plurality of blades 120 are disposed at the edge of the disk 110, and the plurality of blades 120 are disposed at intervals in the circumferential direction of the hub 111. The number of blades 120 is not limited and may be selected as desired. In the present embodiment, the rim of the wheel disc 110 is a broad concept, the rim of the wheel disc 110 is an area relative to the middle of the wheel disc 110, and the rim of the wheel disc 110 is not only the end of the wheel disc 110 or the rim near the end of the wheel disc 110. In the present embodiment, the rim of the disk 110 refers to the area near the end of the disk 110, or it can be understood that one end of the blade 120 is flush with the disk 110 and the other end of the blade 120 is toward the middle of the disk.

The spacing distance of the plurality of blades 120 along the hub 111 can be selected as desired, and in the present embodiment, the plurality of blades 120 are uniformly spaced. The plurality of blades 120 are arranged along a circumferential direction of the hub 111, that is, 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 the present embodiment, the main body 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 of the plurality of blades 120 on the wheel disc 110 can be selected according to the requirement, in this embodiment, a circular ring-shaped impeller 140 is arranged on the wheel disc 110, the impeller 140 is arranged coaxially with the hub 111, and the impeller 140 is punched to form the plurality of blades 120.

The air-guiding ribs 130 extend from the outer peripheral wall of the hub 111 toward the edge of the disk 110, and the air-guiding ribs 130 are spaced 150 apart from the blades 120 in the direction in which the air-guiding ribs 130 extend. The material, shape, etc. of the air-guiding ribs 130 can be selected as desired. In this embodiment, the wind guiding ribs 130 are arc-shaped, that is, the wind guiding ribs 130 are not flat, and the wind guiding ribs 130 have a certain arc.

The installation position and the installation mode of the air guiding ribs 130 on the hub 111 can be selected according to the requirement, in this embodiment, the air guiding ribs 130 do not extend along the radial direction of the hub 111, and the air guiding ribs 130 are inclined to the radial direction of the hub 111. In this embodiment, the number of the air guiding ribs 130 is plural, and the plural air guiding ribs 130 are uniformly arranged along the circumferential direction of the hub 111 at intervals.

The wind-guiding ribs 130 protrude toward the rim of the wheel disc 110, that is, the wind-guiding ribs 130 protrude toward the blades 120, and the wind-guiding ribs 130 protrude toward the outer side of the hub 111. In the extending direction of the wind-guiding rib 130, there is a space 150 between the wind-guiding rib 130 and the blade 120, that is, there is a space 150 between the end of the wind-guiding rib 130 far from the hub 111 and the end of the blade 120 far from the edge of the wheel disc 110. Or it can be understood that the end of the air guiding rib 130 far from the hub 111 is not in contact with the end of the blade 120 far from the edge of the wheel disc 110, and the end of the air guiding rib 130 far from the hub 111 is not in structural interference with the end of the blade 120 far from the edge of the wheel disc 110.

When the centrifugal fan 10 works, the hub 111 drives the air guiding ribs 130, the blades 120 and the wheel disc 110 to rotate, the air guiding ribs 130 drive the air flow between the hub 111 and the blades 120 to rotate in advance, the air guiding ribs 130 enable the air flow between the hub 111 and the blades 120 to be more uniform, and the air guiding ribs 130 enable the air flow to be fully filled between the hub 111 and the blades 120. This effectively improves the flow state of the air flow, reduces the turbulent state of the air flow, and avoids the backflow of the air flow and the vortex of the air flow at the local position of the blade 120. The method can obviously reduce vortex noise and backflow noise and achieve the function of reducing noise of the centrifuge.

As shown in fig. 8 and 9, fig. 8 is a simulation diagram according to a conventional centrifugal fan, and the simulation diagram in fig. 8 mainly shows a velocity vector diagram of an air flow of the conventional centrifugal fan. Fig. 9 is a simulation diagram of the centrifugal fan 10 according to the embodiment of the present invention, and the simulation diagram in fig. 9 mainly shows a velocity vector diagram of an air flow of a conventional centrifugal fan. In the simulation diagram, the airflow in the blue region is low-speed airflow, the airflow in the cyan region is medium-low-speed airflow, and the airflow in the red-yellow region is medium-high-speed airflow. As is apparent from fig. 8, the hub 111 of the conventional centrifugal fan has no air guiding ribs 130, and the air flow velocity distribution between the hub 111 and the blades 120 of the conventional centrifugal fan is not uniform and the air flow is not full. As is apparent from fig. 9, in the centrifugal fan 10 provided by the embodiment of the present invention, the air guiding ribs 130 are disposed on the hub 111 of the centrifugal fan 10, and the air flow velocity distribution between the hub 111 and the blades 120 of the centrifugal fan 10 is relatively uniform and the air flow is relatively full.

FIG. 10 is an acoustic power cloud of a conventional centrifugal fan; FIG. 11 is an acoustic power cloud of the centrifugal fan 10 according to one embodiment of the present invention. As can be seen from the figure, the maximum noise level of the centrifugal fan 10 of one embodiment of the present invention is reduced from 46dB to 44.4dB by 1.6dB and reduced by 3.5%.

The above experimental data show that the air guiding rib 130 in the centrifugal fan 10 provided in this embodiment effectively improves the flowing state of the air flow, the air guiding rib 130 reduces the turbulent flow of the air flow, and the air guiding rib 130 avoids the backflow of the air flow and the vortex of the air flow at the local position of the blade 120. The method can obviously reduce vortex noise and backflow noise and achieve the function of reducing noise of the centrifuge.

Therefore, when the centrifugal fan 10 is in operation, the air guiding ribs 130 drive the air flow between the hub 111 and the blades 120 to rotate, the air guiding ribs 130 make the air flow between the hub 111 and the blades 120 more uniform, and the air flow between the hub 111 and the blades 120 is filled more fully and uniformly. This effectively improves the flow state of the air flow, reduces the turbulent state of the air flow, and avoids the backflow of the air flow and the vortex of the air flow at the local position of the blade 120. The method can obviously reduce vortex noise and backflow noise and achieve the function of reducing noise of the centrifuge.

In other embodiments, a line 160 connecting the center of the wheel disc 110 to an intersection point of the wind guiding rib 130 and the hub 111 forms an included angle with the wind guiding rib 130 at the intersection point, which is in a range of 30 ° to 36 °. As shown in fig. 2, in the present embodiment, the body shape of the wheel disc 110 is circular, or the figure formed after the hub 111 is orthographically projected on the wheel disc 110 is circular. Since the center of the wheel disc 110 is protruded to form the hub 111, the wheel disc 110 has a three-dimensional structure, and the center of the wheel disc 110 is the axis of the hub 111. The intersection of the wind-guiding rib 130 and the hub 111 is also a line, which is referred to as an intersection line for short. The angle between the axis and the intersection line forms a surface, and the included angle between the wind guiding rib 130 and the surface at the intersection line is 30-36 degrees. For convenience of description, in this embodiment, the center of the wheel disc 110 is the center of a figure 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 a point of orthographic projection of the intersection line of the wind guiding rib 130 and the wheel hub 111 on the wheel disc 110, which is referred to as an intersection point for short. The line 160 connecting the intersection point and the center forms two included angles with the air guiding rib 130 at the intersection point, wherein the included angle is an acute angle and an obtuse angle, and the included angle of the acute angle ranges from 30 degrees to 36 degrees.

As shown in fig. 8, in the conventional centrifugal fan, the velocity vector of the air flow between the hub 111 and the blades 120 is relatively disordered, the velocity of the air flow is not uniform, and the direction of the air flow is also relatively disordered. As shown in fig. 9, the present embodiment provides a centrifugal fan 10 in which the velocity vector of the air flow between the hub 111 and the blades 120 is relatively regular. Firstly, the speed of the airflow is relatively uniform, secondly, the direction of the airflow is relatively regular, the direction of the airflow is towards the direction of the blades 120, and the direction of the airflow is towards the direction of the outward air supply of the blades 120. Or it can be understood that the flow direction of the airflow is close to the tangential direction of the airfoil of the blade 120.

Therefore, when the inclination angle of the air guiding rib 130 is in the range of 30 ° to 36 °, the airflow passes through the pre-rotation of the air guiding rib 130, and the flow direction of the airflow approaches the tangential direction of the airfoil shape of the blade 120. That is, the direction and magnitude of the velocity of the air flow is close to the direction and magnitude of the velocity of the blades 120, which 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 air bar 130 adjacent thereto. As a specific example, the wind-guiding rib 130 near the connecting line 160 and the bending center of the blade 120 near the connecting line 160 are both on the connecting line 160 side. Alternatively, it is understood that, taking the orientation in 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 to the blade are both on the same side. Alternatively, it can be understood that the bending directions of the blades 120 and the wind guiding ribs 130 are the same.

As shown in fig. 8, in the conventional centrifugal fan, the velocity vector of the air flow between the hub 111 and the blades 120 is relatively disordered, the velocity of the air flow is not uniform, and the direction of the air flow is relatively disordered. As shown in fig. 9, the present embodiment provides a centrifugal fan 10 in which the velocity vector of the air flow between the hub 111 and the blades 120 is relatively regular. Firstly, the speed of the airflow is relatively uniform, secondly, the direction of the airflow is relatively regular, the direction of the airflow is towards the direction of the blade 120, and the flow direction of the airflow is close to the tangential direction of the airfoil of the blade 120.

It can be seen that the bending center of the blade 120 and the bending center of the wind guiding rib 130 adjacent to the blade are on the same side, that is, the bending directions of the blade 120 and the wind guiding rib 130 adjacent to the blade are the same. The airflow passes through the pre-rotation of the wind guiding rib 130, the flow direction of the airflow is close to the tangential direction of the airfoil shape of the blade 120, and the speed direction and the size of the airflow are 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 radius of curvature of the air guiding rib 130 is equal to or greater than 31 mm, and when the air guiding rib 130 is at the limit, the shape of the air guiding rib 130 is planar. When the curvature radius of the air guiding rib 130 is greater than or equal to 31 mm, the air guiding effect of the air guiding rib 130 is good. Moreover, the air guiding ribs 130 enable the flow direction of the air flow to be close to the tangential direction of the airfoil shape of the blade 120, and the speed direction and the size of the air flow to be close to the speed direction and the size of the blade 120, so that the noise of the centrifugal fan 10 is further reduced.

As shown in fig. 8, in the conventional centrifugal fan, the velocity vector of the air flow between the hub 111 and the blades 120 is relatively disordered, the velocity of the air flow is not uniform, and the direction of the air flow is also relatively disordered. As shown in fig. 9, the present embodiment provides a centrifugal fan 10 in which the velocity vector of the air flow between the hub 111 and the blades 120 is relatively regular. Firstly, the speed of the airflow is relatively uniform, secondly, the direction of the airflow is relatively regular, the direction of the airflow is towards the direction of the blades 120, and the direction of the airflow is towards the direction of the outward air supply of the blades 120. Alternatively, it can be understood that the flow direction of the airflow is close to the tangential direction of the airfoil of the blade 120, and the speed direction and magnitude of the airflow are close to the speed direction and magnitude of the blade 120.

Therefore, when the curvature radius of the air guiding rib 130 is equal to or greater than 31 mm, the air guiding effect of the air guiding rib 130 is relatively good. Moreover, the air guiding ribs 130 enable the flow direction of the air flow to be close to the tangential direction of the airfoil shape of the blade 120, and the speed direction and the size of the air flow to be close to the speed direction and the size of the blade 120, so that the noise of the centrifugal fan 10 is further reduced.

In other embodiments, the radius of curvature of the blade 120 is less than the radius of curvature of the air guide rib 130, i.e., the blade 120 is curved more than the air guide rib 130. The air guiding rib 130 has a good air guiding effect. Moreover, the air guiding ribs 130 enable the flow direction of the air flow to be close to the tangential direction of the airfoil shape of the blade 120, and the speed direction and the size of the air flow to be close to the speed direction and the size of the blade 120, so that the noise of the centrifugal fan 10 is further reduced.

In other embodiments, the length of the wind-guiding rib 130 along the extending direction is 0.17 to 0.21 times the diameter of the wheel disc 110. That is, the size of the air guiding rib 130 along the extending direction is 0.17 to 0.21 times of the diameter of the wheel disc 110, and the air guiding effect of the air guiding rib 130 with the size is good.

In other embodiments, the dimension of the air-guiding ribs 130 in the protruding direction of the hub 111 is 0.5 to 0.7 times the dimension of the blades 120 in the protruding direction of the hub 111. That is, along the protruding direction of wheel hub 111, the length value of wind-guiding muscle 130 is 0.5 times to 0.7 times of the length value of wheel hub 111, and the wind-guiding muscle 130 of this kind of size wind-guiding effect is better.

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 spaced along the outer circumferential wall of the hub 111. This number of air guiding ribs 130 results in a relatively uniform air flow between the hub 111 and the blades 120.

In some other embodiments, the centrifugal fan 10 further includes a housing 200, and a cavity of the housing 200 is used for accommodating the wind wheel 100, and the wind inlet 220 and the wind outlet 210 are formed along two sides of one diameter of the wheel disc 110. The air inlet 220 and the air outlet 210 are respectively opened at two sides of one diameter of the wind wheel 100, or it is understood that the air inlet 220 and the air outlet 210 are respectively opened at two opposite sides of the housing 200. With respect to the orientation of the figures, as shown in fig. 3 to 5, if the air outlet 210 is opened at the top of the housing 200, the air inlet 220 is opened at the bottom of the housing 200. It is obvious that the positions where 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 invention, there is also provided an air conditioner comprising a centrifugal fan 10 as defined in any one of the above. Since the air conditioner includes the centrifugal fan 10 as described above, the air conditioner has the advantages of the centrifugal fan 10 as described above, and will not be described herein again.

The specific type of the air conditioner can be selected according to the requirement, 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, is positioned in the casing and is integrated with the original air-conditioning indoor unit, the centrifugal fan 10 is not exposed outside the indoor unit, the aesthetic feeling of the appearance is kept, and the space for installing the indoor unit is saved. The air inlet 220 of the centrifugal fan 10 is used for connecting a fresh air inlet pipe leading to the outdoor, and the air outlet 210 of the centrifugal fan 10 faces to the top of the casing. That is, the air inlet 220 of the centrifugal fan 10 sucks in fresh air from the outside, and the air outlet 210 of the centrifugal fan blows out air toward the top of the cabinet. The centrifugal fan 10 continuously delivers fresh air from the outside to the inside of the room.

Therefore, the centrifugal fan 10 is additionally arranged on the traditional air conditioner indoor unit of the fresh air conditioner, so that in the air conditioner refrigerating or heating process, even if a window is closed, outdoor air can be introduced into a room by the centrifugal fan 10, the centrifugal fan 10 provides continuous and fresh air for a closed indoor space, the oxygen content of the indoor air is increased, and air conditioning diseases are avoided.

In the description of the present embodiments, it is to 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 and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include at least one such feature, i.e., one or more such features. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. When a feature "comprises or comprises" a or some of its intended features, this indicates that other features are not excluded and that other features may be further included, unless expressly stated otherwise.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and "coupled" and the like are to be construed broadly and can, for example, be fixedly connected or detachably connected or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. Those skilled in the art should understand the specific meaning of the above terms in the present invention according to specific situations.

Further, in the description of the present embodiment, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature therebetween. That is, in the description of the present embodiment, the first feature being "on", "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is higher in level than the second feature. A first feature "under," "beneath," or "beneath" a second feature may be directly under or obliquely under the first feature, or simply mean that the first feature is at a lesser elevation than the second feature.

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

In the description of the present embodiments, reference to the description of "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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. A centrifugal fan comprising a rotor, the rotor comprising:

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

the wind guiding ribs extend from the peripheral wall of the hub towards the edge of the wheel disc, and are spaced from the blades in the direction in which the wind guiding ribs extend.

2. The centrifugal fan of claim 1,

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

3. The centrifugal fan of claim 1,

the size of the wind guiding ribs along the hub protruding direction is 0.5 times to 0.7 times the size of the blades along the hub protruding direction.

4. The centrifugal fan of claim 1,

the range of an included angle between a connecting line from the center of the wheel disc to the intersection point of the air guiding rib and the wheel hub and the intersection point of the air guiding rib is 30-36 degrees.

5. The centrifugal fan of claim 1,

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

6. The centrifugal fan of claim 5,

the curvature radius of the air guiding rib is larger than or equal to 31 mm.

7. The centrifugal fan of claim 5,

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

8. The centrifugal fan of claim 1,

the quantity scope of air guide rib is 10 to 16, and is a plurality of air guide rib follows the circumference interval of the periphery wall of wheel hub evenly sets up.

9. 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.

10. An air conditioner, wherein the air conditioner comprises the centrifugal fan as claimed in any one of claims 1 to 9.